Update dependency packages

50 files changed, 0 insertions, 8258 deletions

diff --git a/contracts/extensions/CHANGELOG.json b/contracts/extensions/CHANGELOG.json
deleted file mode 100644
index 920fef05a..000000000
--- a/contracts/extensions/CHANGELOG.json
+++ /dev/null
@@ -1,74 +0,0 @@
-[
-    {
-        "version": "2.0.0",
-        "changes": [
-            {
-                "note": "Upgrade the bignumber.js to v8.0.2",
-                "pr": 1517
-            }
-        ]
-    },
-    {
-        "timestamp": 1547747677,
-        "version": "1.2.3",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1547561734,
-        "version": "1.2.2",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "timestamp": 1547225310,
-        "version": "1.2.1",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    },
-    {
-        "version": "1.2.0",
-        "changes": [
-            {
-                "note": "Added Dutch Auction Wrapper",
-                "pr": 1465
-            }
-        ],
-        "timestamp": 1547040760
-    },
-    {
-        "version": "1.1.0",
-        "changes": [
-            {
-                "note": "Added Balance Threshold Filter",
-                "pr": 1383
-            },
-            {
-                "note": "Add OrderMatcher",
-                "pr": 1117
-            },
-            {
-                "note": "Add OrderValidator",
-                "pr": 1464
-            }
-        ]
-    },
-    {
-        "timestamp": 1544741676,
-        "version": "1.0.2",
-        "changes": [
-            {
-                "note": "Dependencies updated"
-            }
-        ]
-    }
-]
diff --git a/contracts/extensions/CHANGELOG.md b/contracts/extensions/CHANGELOG.md
deleted file mode 100644
index 94ffdfb67..000000000
--- a/contracts/extensions/CHANGELOG.md
+++ /dev/null
@@ -1,32 +0,0 @@
-<!--
-changelogUtils.file is auto-generated using the monorepo-scripts package. Don't edit directly.
-Edit the package's CHANGELOG.json file only.
--->
-
-CHANGELOG
-
-## v1.2.3 - _January 17, 2019_
-
-    * Dependencies updated
-
-## v1.2.2 - _January 15, 2019_
-
-    * Dependencies updated
-
-## v1.2.1 - _January 11, 2019_
-
-    * Dependencies updated
-
-## v1.2.0 - _January 9, 2019_
-
-    * Added Dutch Auction Wrapper (#1465)
-
-## v1.1.0 - _Invalid date_
-
-    * Added Balance Threshold Filter (#1383)
-    * Add OrderMatcher (#1117)
-    * Add OrderValidator (#1464)
-
-## v1.0.2 - _December 13, 2018_
-
-    * Dependencies updated
diff --git a/contracts/extensions/DEPLOYS.json b/contracts/extensions/DEPLOYS.json
deleted file mode 100644
index 1a093bf77..000000000
--- a/contracts/extensions/DEPLOYS.json
+++ /dev/null
@@ -1,31 +0,0 @@
-[
-    {
-        "name": "Forwarder",
-        "version": "1.1.0",
-        "changes": [
-            {
-                "note": "Round up when calculating remaining amounts in marketBuy functions",
-                "pr": 1162,
-                "networks": {
-                    "1": "0x5468a1dc173652ee28d249c271fa9933144746b1",
-                    "3": "0x2240dab907db71e64d3e0dba4800c83b5c502d4e",
-                    "42": "0x17992e4ffb22730138e4b62aaa6367fa9d3699a6"
-                }
-            }
-        ]
-    },
-    {
-        "name": "Forwarder",
-        "version": "1.0.0",
-        "changes": [
-            {
-                "note": "protocol v2 deploy",
-                "networks": {
-                    "1": "0x7afc2d5107af94c462a194d2c21b5bdd238709d6",
-                    "3": "0x3983e204b12b3c02fb0638caf2cd406a62e0ead3",
-                    "42": "0xd85e2fa7e7e252b27b01bf0d65c946959d2f45b8"
-                }
-            }
-        ]
-    }
-]
diff --git a/contracts/extensions/README.md b/contracts/extensions/README.md
deleted file mode 100644
index 820f6e78a..000000000
--- a/contracts/extensions/README.md
+++ /dev/null
@@ -1,69 +0,0 @@
-## Contract extensions
-
-Smart contracts that implement extensions for the 0x protocol.
-
-## Usage
-
-Contract extensions of the protocol can be found in the [contracts](./contracts) directory. This directory contains contracts that interact with the 2.0.0 contracts and will be used in production, such as the [Forwarder](https://github.com/0xProject/0x-protocol-specification/blob/master/v2/forwarder-specification.md) contract.
-
-## Bug bounty
-
-A bug bounty for the 2.0.0 contracts is ongoing! Instructions can be found [here](https://0xproject.com/wiki#Bug-Bounty).
-
-## Contributing
-
-We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
-
-For proposals regarding the 0x protocol's smart contract architecture, message format, or additional functionality, go to the [0x Improvement Proposals (ZEIPs)](https://github.com/0xProject/ZEIPs) repository and follow the contribution guidelines provided therein.
-
-Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
-
-### Install Dependencies
-
-If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
-
-```bash
-yarn config set workspaces-experimental true
-```
-
-Then install dependencies
-
-```bash
-yarn install
-```
-
-### Build
-
-To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:
-
-```bash
-PKG=@0x/contracts-extensions yarn build
-```
-
-Or continuously rebuild on change:
-
-```bash
-PKG=@0x/contracts-extensions yarn watch
-```
-
-### Clean
-
-```bash
-yarn clean
-```
-
-### Lint
-
-```bash
-yarn lint
-```
-
-### Run Tests
-
-```bash
-yarn test
-```
-
-#### Testing options
-
-Contracts testing options like coverage, profiling, revert traces or backing node choosing - are described [here](../TESTING.md).
diff --git a/contracts/extensions/compiler.json b/contracts/extensions/compiler.json
deleted file mode 100644
index 2bb468724..000000000
--- a/contracts/extensions/compiler.json
+++ /dev/null
@@ -1,22 +0,0 @@
-{
-    "artifactsDir": "./generated-artifacts",
-    "contractsDir": "./contracts",
-    "compilerSettings": {
-        "optimizer": {
-            "enabled": true,
-            "runs": 1000000
-        },
-        "outputSelection": {
-            "*": {
-                "*": [
-                    "abi",
-                    "evm.bytecode.object",
-                    "evm.bytecode.sourceMap",
-                    "evm.deployedBytecode.object",
-                    "evm.deployedBytecode.sourceMap"
-                ]
-            }
-        }
-    },
-    "contracts": ["BalanceThresholdFilter", "DutchAuction", "Forwarder", "OrderMatcher", "OrderValidator"]
-}
diff --git a/contracts/extensions/contracts/BalanceThresholdFilter/BalanceThresholdFilter.sol b/contracts/extensions/contracts/BalanceThresholdFilter/BalanceThresholdFilter.sol
deleted file mode 100644
index 16cacd461..000000000
--- a/contracts/extensions/contracts/BalanceThresholdFilter/BalanceThresholdFilter.sol
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity 0.4.24;
-
-import "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-import "./interfaces/IThresholdAsset.sol";
-import "./MixinBalanceThresholdFilterCore.sol";
-
-
-contract BalanceThresholdFilter is
-    MixinBalanceThresholdFilterCore
-{
-
-    /// @dev Constructs BalanceThresholdFilter.
-    /// @param exchange Address of 0x exchange.
-    /// @param thresholdAsset The asset that must be held by makers/takers.
-    /// @param balanceThreshold The minimum balance of `thresholdAsset` that must be held by makers/takers.
-    constructor(
-        address exchange,
-        address thresholdAsset,
-        uint256 balanceThreshold
-    )
-        public
-    {
-        EXCHANGE = IExchange(exchange);
-        THRESHOLD_ASSET = IThresholdAsset(thresholdAsset);
-        BALANCE_THRESHOLD = balanceThreshold;
-    }
-}
diff --git a/contracts/extensions/contracts/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol b/contracts/extensions/contracts/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol
deleted file mode 100644
index da050bf72..000000000
--- a/contracts/extensions/contracts/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contracts-libs/contracts/libs/LibExchangeSelectors.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "./mixins/MBalanceThresholdFilterCore.sol";
-import "./MixinExchangeCalldata.sol";
-
-
-contract MixinBalanceThresholdFilterCore is
-    MBalanceThresholdFilterCore,
-    MixinExchangeCalldata,
-    LibOrder,
-    LibExchangeSelectors
-{
-
-    /// @dev Executes an Exchange transaction iff the maker and taker meet 
-    ///      the hold at least `BALANCE_THRESHOLD` of the asset `THRESHOLD_ASSET` OR 
-    ///      the exchange function is a cancellation.
-    ///      Supported Exchange functions:
-    ///          batchFillOrders
-    ///          batchFillOrdersNoThrow
-    ///          batchFillOrKillOrders
-    ///          fillOrder
-    ///          fillOrderNoThrow
-    ///          fillOrKillOrder
-    ///          marketBuyOrders
-    ///          marketBuyOrdersNoThrow
-    ///          marketSellOrders
-    ///          marketSellOrdersNoThrow
-    ///          matchOrders
-    ///          cancelOrder
-    ///          batchCancelOrders
-    ///          cancelOrdersUpTo
-    ///     Trying to call any other exchange function will throw.
-    /// @param salt Arbitrary number to ensure uniqueness of transaction hash.
-    /// @param signerAddress Address of transaction signer.
-    /// @param signedExchangeTransaction AbiV2 encoded calldata.
-    /// @param signature Proof of signer transaction by signer.
-    function executeTransaction(
-        uint256 salt,
-        address signerAddress,
-        bytes signedExchangeTransaction,
-        bytes signature
-    ) 
-        external
-    {
-        // Get accounts whose balances must be validated
-        address[] memory addressesToValidate = getAddressesToValidate(signerAddress);
-
-        // Validate account balances
-        uint256 balanceThreshold = BALANCE_THRESHOLD;
-        IThresholdAsset thresholdAsset = THRESHOLD_ASSET;
-        for (uint256 i = 0; i < addressesToValidate.length; ++i) {
-            uint256 addressBalance = thresholdAsset.balanceOf(addressesToValidate[i]);
-            require(
-                addressBalance >= balanceThreshold,
-                "AT_LEAST_ONE_ADDRESS_DOES_NOT_MEET_BALANCE_THRESHOLD"
-            );
-        }
-        emit ValidatedAddresses(addressesToValidate);
-        
-        // All addresses are valid. Execute exchange function.
-        EXCHANGE.executeTransaction(
-            salt,
-            signerAddress,
-            signedExchangeTransaction,
-            signature
-        );
-    }
-
-    /// @dev Constructs an array of addresses to be validated.
-    ///      Addresses depend on which Exchange function is to be called
-    ///      (defined by `signedExchangeTransaction` above).
-    /// @param signerAddress Address of transaction signer.
-    /// @return addressesToValidate Array of addresses to validate.
-    function getAddressesToValidate(address signerAddress)
-        internal pure
-        returns (address[] memory addressesToValidate)
-    {
-        bytes4 exchangeFunctionSelector = bytes4(exchangeCalldataload(0));
-        // solhint-disable expression-indent
-        if (
-            exchangeFunctionSelector == BATCH_FILL_ORDERS_SELECTOR              ||
-            exchangeFunctionSelector == BATCH_FILL_ORDERS_NO_THROW_SELECTOR     ||
-            exchangeFunctionSelector == BATCH_FILL_OR_KILL_ORDERS_SELECTOR      ||
-            exchangeFunctionSelector == MARKET_BUY_ORDERS_SELECTOR              ||
-            exchangeFunctionSelector == MARKET_BUY_ORDERS_NO_THROW_SELECTOR     ||
-            exchangeFunctionSelector == MARKET_SELL_ORDERS_SELECTOR             ||
-            exchangeFunctionSelector == MARKET_SELL_ORDERS_NO_THROW_SELECTOR
-        ) {
-            addressesToValidate = loadMakerAddressesFromOrderArray(0);
-            addressesToValidate = addressesToValidate.append(signerAddress);
-        } else if (
-            exchangeFunctionSelector == FILL_ORDER_SELECTOR             ||
-            exchangeFunctionSelector == FILL_ORDER_NO_THROW_SELECTOR    ||
-            exchangeFunctionSelector == FILL_OR_KILL_ORDER_SELECTOR
-        ) {
-            address makerAddress = loadMakerAddressFromOrder(0);
-            addressesToValidate = addressesToValidate.append(makerAddress);
-            addressesToValidate = addressesToValidate.append(signerAddress);
-        } else if (exchangeFunctionSelector == MATCH_ORDERS_SELECTOR) {
-            address leftMakerAddress = loadMakerAddressFromOrder(0);
-            addressesToValidate = addressesToValidate.append(leftMakerAddress);
-            address rightMakerAddress = loadMakerAddressFromOrder(1);
-            addressesToValidate = addressesToValidate.append(rightMakerAddress);
-            addressesToValidate = addressesToValidate.append(signerAddress);
-        } else if (
-            exchangeFunctionSelector != CANCEL_ORDER_SELECTOR           &&
-            exchangeFunctionSelector != BATCH_CANCEL_ORDERS_SELECTOR    &&
-            exchangeFunctionSelector != CANCEL_ORDERS_UP_TO_SELECTOR
-        ) {
-            revert("INVALID_OR_BLOCKED_EXCHANGE_SELECTOR");
-        }
-        // solhint-enable expression-indent
-        return addressesToValidate;
-    }
-}
diff --git a/contracts/extensions/contracts/BalanceThresholdFilter/MixinExchangeCalldata.sol b/contracts/extensions/contracts/BalanceThresholdFilter/MixinExchangeCalldata.sol
deleted file mode 100644
index a15e95a9d..000000000
--- a/contracts/extensions/contracts/BalanceThresholdFilter/MixinExchangeCalldata.sol
+++ /dev/null
@@ -1,103 +0,0 @@
-    
-    /*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "./mixins/MExchangeCalldata.sol";
-import "@0x/contracts-libs/contracts/libs/LibAddressArray.sol";
-
-
-contract MixinExchangeCalldata is 
-    MExchangeCalldata
-{
-
-    using LibAddressArray for address[];
-
-    /// @dev Emulates the `calldataload` opcode on the embedded Exchange calldata,
-    ///      which is accessed through `signedExchangeTransaction`.
-    /// @param offset  Offset into the Exchange calldata.
-    /// @return value  Corresponding 32 byte value stored at `offset`.
-    function exchangeCalldataload(uint256 offset)
-        internal pure
-        returns (bytes32 value)
-    {
-        assembly {
-            // Pointer to exchange transaction
-            // 0x04 for calldata selector
-            // 0x40 to access `signedExchangeTransaction`, which is the third parameter
-            let exchangeTxPtr := calldataload(0x44)
-
-            // Offset into Exchange calldata
-            // We compute this by adding 0x24 to the `exchangeTxPtr` computed above.
-            // 0x04 for calldata selector
-            // 0x20 for length field of `signedExchangeTransaction`
-            let exchangeCalldataOffset := add(exchangeTxPtr, add(0x24, offset))
-            value := calldataload(exchangeCalldataOffset)
-        }
-        return value;
-    }
-
-    /// @dev Convenience function that skips the 4 byte selector when loading
-    ///      from the embedded Exchange calldata.
-    /// @param offset  Offset into the Exchange calldata (minus the 4 byte selector)
-    /// @return value  Corresponding 32 byte value stored at `offset` + 4.
-    function loadExchangeData(uint256 offset)
-        internal pure
-        returns (bytes32 value)
-    {
-        value = exchangeCalldataload(offset + 4);
-        return value;
-    }
-
-    /// @dev Extracts the maker address from an order stored in the Exchange calldata
-    ///      (which is embedded in `signedExchangeTransaction`).
-    /// @param orderParamIndex  Index of the order in the Exchange function's signature.
-    /// @return makerAddress The extracted maker address.
-    function loadMakerAddressFromOrder(uint256 orderParamIndex)
-        internal pure
-        returns (address makerAddress)
-    {
-        uint256 orderOffsetInBytes = orderParamIndex * 32;
-        uint256 orderPtr = uint256(loadExchangeData(orderOffsetInBytes));
-        makerAddress = address(loadExchangeData(orderPtr));
-        return makerAddress;
-    }
-
-    /// @dev Extracts the maker addresses from an array of orders stored in the Exchange calldata
-    ///      (which is embedded in `signedExchangeTransaction`).
-    /// @param orderArrayParamIndex  Index of the order array in the Exchange function's signature
-    /// @return makerAddresses The extracted maker addresses.
-    function loadMakerAddressesFromOrderArray(uint256 orderArrayParamIndex)
-        internal pure
-        returns (address[] makerAddresses)
-    {
-        uint256 orderArrayOffsetInBytes = orderArrayParamIndex * 32;
-        uint256 orderArrayPtr = uint256(loadExchangeData(orderArrayOffsetInBytes));
-        uint256 orderArrayLength = uint256(loadExchangeData(orderArrayPtr));
-        uint256 orderArrayLengthInBytes = orderArrayLength * 32;
-        uint256 orderArrayElementPtr = orderArrayPtr + 32;
-        uint256 orderArrayElementEndPtr = orderArrayElementPtr + orderArrayLengthInBytes;
-        for (uint orderPtrOffset = orderArrayElementPtr; orderPtrOffset < orderArrayElementEndPtr; orderPtrOffset += 32) {
-            uint256 orderPtr = uint256(loadExchangeData(orderPtrOffset));
-            address makerAddress = address(loadExchangeData(orderPtr + orderArrayElementPtr));
-            makerAddresses = makerAddresses.append(makerAddress);
-        }
-        return makerAddresses;
-    }
-}
diff --git a/contracts/extensions/contracts/BalanceThresholdFilter/interfaces/IBalanceThresholdFilterCore.sol b/contracts/extensions/contracts/BalanceThresholdFilter/interfaces/IBalanceThresholdFilterCore.sol
deleted file mode 100644
index 4a1bf1fb2..000000000
--- a/contracts/extensions/contracts/BalanceThresholdFilter/interfaces/IBalanceThresholdFilterCore.sol
+++ /dev/null
@@ -1,55 +0,0 @@
-
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-
-contract IBalanceThresholdFilterCore {
-    
-    /// @dev Executes an Exchange transaction iff the maker and taker meet 
-    ///      the hold at least `BALANCE_THRESHOLD` of the asset `THRESHOLD_ASSET` OR 
-    ///      the exchange function is a cancellation.
-    ///      Supported Exchange functions:
-    ///         - batchFillOrders
-    ///         - batchFillOrdersNoThrow
-    ///         - batchFillOrKillOrders
-    ///         - fillOrder
-    ///         - fillOrderNoThrow
-    ///         - fillOrKillOrder
-    ///         - marketBuyOrders
-    ///         - marketBuyOrdersNoThrow
-    ///         - marketSellOrders
-    ///         - marketSellOrdersNoThrow
-    ///         - matchOrders
-    ///         - cancelOrder
-    ///         - batchCancelOrders
-    ///         - cancelOrdersUpTo
-    ///     Trying to call any other exchange function will throw.
-    /// @param salt Arbitrary number to ensure uniqueness of transaction hash.
-    /// @param signerAddress Address of transaction signer.
-    /// @param signedExchangeTransaction AbiV2 encoded calldata.
-    /// @param signature Proof of signer transaction by signer.
-    function executeTransaction(
-        uint256 salt,
-        address signerAddress,
-        bytes signedExchangeTransaction,
-        bytes signature
-    ) 
-        external;
-}
diff --git a/contracts/extensions/contracts/BalanceThresholdFilter/interfaces/IThresholdAsset.sol b/contracts/extensions/contracts/BalanceThresholdFilter/interfaces/IThresholdAsset.sol
deleted file mode 100644
index f78f9c2de..000000000
--- a/contracts/extensions/contracts/BalanceThresholdFilter/interfaces/IThresholdAsset.sol
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-
-contract IThresholdAsset {
-
-    /// @param _owner The address from which the balance will be retrieved
-    /// @return Balance of owner
-    function balanceOf(address _owner)
-        external
-        view
-        returns (uint256);
-
-}
diff --git a/contracts/extensions/contracts/BalanceThresholdFilter/mixins/MBalanceThresholdFilterCore.sol b/contracts/extensions/contracts/BalanceThresholdFilter/mixins/MBalanceThresholdFilterCore.sol
deleted file mode 100644
index 074686e8d..000000000
--- a/contracts/extensions/contracts/BalanceThresholdFilter/mixins/MBalanceThresholdFilterCore.sol
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-import "../interfaces/IThresholdAsset.sol";
-import "../interfaces/IBalanceThresholdFilterCore.sol";
-
-
-contract MBalanceThresholdFilterCore is
-    IBalanceThresholdFilterCore
-{
-
-    // Points to 0x exchange contract
-    // solhint-disable var-name-mixedcase
-    IExchange internal EXCHANGE;
-
-    // The asset that must be held by makers/takers
-    IThresholdAsset internal THRESHOLD_ASSET;
-
-    // The minimum balance of `THRESHOLD_ASSET` that must be held by makers/takers
-    uint256 internal BALANCE_THRESHOLD;
-    // solhint-enable var-name-mixedcase
-
-    // Addresses that hold at least `BALANCE_THRESHOLD` of `THRESHOLD_ASSET`
-    event ValidatedAddresses (
-        address[] addresses
-    );
-
-    /// @dev Constructs an array of addresses to be validated.
-    ///      Addresses depend on which Exchange function is to be called
-    ///      (defined by `signedExchangeTransaction` above).
-    /// @param signerAddress Address of transaction signer.
-    /// @return addressesToValidate Array of addresses to validate.
-    function getAddressesToValidate(address signerAddress)
-        internal pure
-        returns (address[] memory addressesToValidate);
-}
diff --git a/contracts/extensions/contracts/BalanceThresholdFilter/mixins/MExchangeCalldata.sol b/contracts/extensions/contracts/BalanceThresholdFilter/mixins/MExchangeCalldata.sol
deleted file mode 100644
index 40536d820..000000000
--- a/contracts/extensions/contracts/BalanceThresholdFilter/mixins/MExchangeCalldata.sol
+++ /dev/null
@@ -1,56 +0,0 @@
-    
-    /*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-
-contract MExchangeCalldata {
-
-    /// @dev Emulates the `calldataload` opcode on the embedded Exchange calldata,
-    ///      which is accessed through `signedExchangeTransaction`.
-    /// @param offset  Offset into the Exchange calldata.
-    /// @return value  Corresponding 32 byte value stored at `offset`.
-    function exchangeCalldataload(uint256 offset)
-        internal pure
-        returns (bytes32 value);
-
-    /// @dev Convenience function that skips the 4 byte selector when loading
-    ///      from the embedded Exchange calldata.
-    /// @param offset  Offset into the Exchange calldata (minus the 4 byte selector)
-    /// @return value  Corresponding 32 byte value stored at `offset` + 4.
-    function loadExchangeData(uint256 offset)
-        internal pure
-        returns (bytes32 value);
-
-    /// @dev Extracts the maker address from an order stored in the Exchange calldata
-    ///      (which is embedded in `signedExchangeTransaction`).
-    /// @param orderParamIndex  Index of the order in the Exchange function's signature.
-    /// @return makerAddress The extracted maker address.
-    function loadMakerAddressFromOrder(uint256 orderParamIndex)
-        internal pure
-        returns (address makerAddress);
-
-    /// @dev Extracts the maker addresses from an array of orders stored in the Exchange calldata
-    ///      (which is embedded in `signedExchangeTransaction`).
-    /// @param orderArrayParamIndex  Index of the order array in the Exchange function's signature
-    /// @return makerAddresses The extracted maker addresses.
-    function loadMakerAddressesFromOrderArray(uint256 orderArrayParamIndex)
-        internal pure
-        returns (address[] makerAddresses);
-}
diff --git a/contracts/extensions/contracts/DutchAuction/DutchAuction.sol b/contracts/extensions/contracts/DutchAuction/DutchAuction.sol
deleted file mode 100644
index 9c9f3990a..000000000
--- a/contracts/extensions/contracts/DutchAuction/DutchAuction.sol
+++ /dev/null
@@ -1,205 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity 0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC20Token/IERC20Token.sol";
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-import "@0x/contracts-utils/contracts/utils/SafeMath/SafeMath.sol";
-
-
-contract DutchAuction is
-    SafeMath
-{
-    using LibBytes for bytes;
-
-    // solhint-disable var-name-mixedcase
-    IExchange internal EXCHANGE;
-
-    struct AuctionDetails {
-        uint256 beginTimeSeconds;    // Auction begin unix timestamp: sellOrder.makerAssetData
-        uint256 endTimeSeconds;      // Auction end unix timestamp: sellOrder.expiryTimeSeconds
-        uint256 beginAmount;         // Auction begin amount: sellOrder.makerAssetData
-        uint256 endAmount;           // Auction end amount: sellOrder.takerAssetAmount
-        uint256 currentAmount;       // Calculated amount given block.timestamp
-        uint256 currentTimeSeconds;  // block.timestamp
-    }
-
-    constructor (address _exchange)
-        public
-    {
-        EXCHANGE = IExchange(_exchange);
-    }
-
-    /// @dev Matches the buy and sell orders at an amount given the following: the current block time, the auction
-    ///      start time and the auction begin amount. The sell order is a an order at the lowest amount
-    ///      at the end of the auction. Excess from the match is transferred to the seller.
-    ///      Over time the price moves from beginAmount to endAmount given the current block.timestamp.
-    ///      sellOrder.expiryTimeSeconds is the end time of the auction.
-    ///      sellOrder.takerAssetAmount is the end amount of the auction (lowest possible amount).
-    ///      sellOrder.makerAssetData is the ABI encoded Asset Proxy data with the following data appended
-    ///      buyOrder.makerAssetData is the buyers bid on the auction, must meet the amount for the current block timestamp
-    ///      (uint256 beginTimeSeconds, uint256 beginAmount).
-    ///      This function reverts in the following scenarios:
-    ///         * Auction has not started (auctionDetails.currentTimeSeconds < auctionDetails.beginTimeSeconds)
-    ///         * Auction has expired (auctionDetails.endTimeSeconds < auctionDetails.currentTimeSeconds)
-    ///         * Amount is invalid: Buy order amount is too low (buyOrder.makerAssetAmount < auctionDetails.currentAmount)
-    ///         * Amount is invalid: Invalid begin amount (auctionDetails.beginAmount > auctionDetails.endAmount)
-    ///         * Any failure in the 0x Match Orders
-    /// @param buyOrder The Buyer's order. This order is for the current expected price of the auction.
-    /// @param sellOrder The Seller's order. This order is for the lowest amount (at the end of the auction).
-    /// @param buySignature Proof that order was created by the buyer.
-    /// @param sellSignature Proof that order was created by the seller.
-    /// @return matchedFillResults amounts filled and fees paid by maker and taker of matched orders.
-    function matchOrders(
-        LibOrder.Order memory buyOrder,
-        LibOrder.Order memory sellOrder,
-        bytes memory buySignature,
-        bytes memory sellSignature
-    )
-        public
-        returns (LibFillResults.MatchedFillResults memory matchedFillResults)
-    {
-        AuctionDetails memory auctionDetails = getAuctionDetails(sellOrder);
-        // Ensure the auction has not yet started
-        require(
-            auctionDetails.currentTimeSeconds >= auctionDetails.beginTimeSeconds,
-            "AUCTION_NOT_STARTED"
-        );
-        // Ensure the auction has not expired. This will fail later in 0x but we can save gas by failing early
-        require(
-            sellOrder.expirationTimeSeconds > auctionDetails.currentTimeSeconds,
-            "AUCTION_EXPIRED"
-        );
-        // Validate the buyer amount is greater than the current auction amount
-        require(
-            buyOrder.makerAssetAmount >= auctionDetails.currentAmount,
-            "INVALID_AMOUNT"
-        );
-        // Match orders, maximally filling `buyOrder`
-        matchedFillResults = EXCHANGE.matchOrders(
-            buyOrder,
-            sellOrder,
-            buySignature,
-            sellSignature
-        );
-        // The difference in sellOrder.takerAssetAmount and current amount is given as spread to the matcher
-        // This may include additional spread from the buyOrder.makerAssetAmount and the currentAmount.
-        // e.g currentAmount is 30, sellOrder.takerAssetAmount is 10 and buyOrder.makerAssetamount is 40.
-        // 10 (40-30) is returned to the buyer, 20 (30-10) sent to the seller and 10 has previously
-        // been transferred to the seller during matchOrders
-        uint256 leftMakerAssetSpreadAmount = matchedFillResults.leftMakerAssetSpreadAmount;
-        if (leftMakerAssetSpreadAmount > 0) {
-            // ERC20 Asset data itself is encoded as follows:
-            //
-            // | Area     | Offset | Length  | Contents                            |
-            // |----------|--------|---------|-------------------------------------|
-            // | Header   | 0      | 4       | function selector                   |
-            // | Params   |        | 1 * 32  | function parameters:                |
-            // |          | 4      | 12      |   1. token address padding          |
-            // |          | 16     | 20      |   2. token address                  |
-            bytes memory assetData = sellOrder.takerAssetData;
-            address token = assetData.readAddress(16);
-            // Calculate the excess from the buy order. This can occur if the buyer sends in a higher
-            // amount than the calculated current amount
-            uint256 buyerExcessAmount = safeSub(buyOrder.makerAssetAmount, auctionDetails.currentAmount);
-            uint256 sellerExcessAmount = safeSub(leftMakerAssetSpreadAmount, buyerExcessAmount);
-            // Return the difference between auctionDetails.currentAmount and sellOrder.takerAssetAmount
-            // to the seller
-            if (sellerExcessAmount > 0) {
-                IERC20Token(token).transfer(sellOrder.makerAddress, sellerExcessAmount);
-            }
-            // Return the difference between buyOrder.makerAssetAmount and auctionDetails.currentAmount
-            // to the buyer
-            if (buyerExcessAmount > 0) {
-                IERC20Token(token).transfer(buyOrder.makerAddress, buyerExcessAmount);
-            }
-        }
-        return matchedFillResults;
-    }
-
-    /// @dev Calculates the Auction Details for the given order
-    /// @param order The sell order
-    /// @return AuctionDetails
-    function getAuctionDetails(
-        LibOrder.Order memory order
-    )
-        public
-        returns (AuctionDetails memory auctionDetails)
-    {
-        uint256 makerAssetDataLength = order.makerAssetData.length;
-        // It is unknown the encoded data of makerAssetData, we assume the last 64 bytes
-        // are the Auction Details encoding.
-        // Auction Details is encoded as follows:
-        //
-        // | Area     | Offset | Length  | Contents                            |
-        // |----------|--------|---------|-------------------------------------|
-        // | Params   |        | 2 * 32  | parameters:                         |
-        // |          | -64    | 32      |   1. auction begin unix timestamp   |
-        // |          | -32    | 32      |   2. auction begin begin amount     |
-        // ERC20 asset data length is 4+32, 64 for auction details results in min length 100
-        require(
-            makerAssetDataLength >= 100,
-            "INVALID_ASSET_DATA"
-        );
-        uint256 auctionBeginTimeSeconds = order.makerAssetData.readUint256(makerAssetDataLength - 64);
-        uint256 auctionBeginAmount = order.makerAssetData.readUint256(makerAssetDataLength - 32);
-        // Ensure the auction has a valid begin time
-        require(
-            order.expirationTimeSeconds > auctionBeginTimeSeconds,
-            "INVALID_BEGIN_TIME"
-        );
-        uint256 auctionDurationSeconds = order.expirationTimeSeconds-auctionBeginTimeSeconds;
-        // Ensure the auction goes from high to low
-        uint256 minAmount = order.takerAssetAmount;
-        require(
-            auctionBeginAmount > minAmount,
-            "INVALID_AMOUNT"
-        );
-        uint256 amountDelta = auctionBeginAmount-minAmount;
-        // solhint-disable-next-line not-rely-on-time
-        uint256 timestamp = block.timestamp;
-        auctionDetails.beginTimeSeconds = auctionBeginTimeSeconds;
-        auctionDetails.endTimeSeconds = order.expirationTimeSeconds;
-        auctionDetails.beginAmount = auctionBeginAmount;
-        auctionDetails.endAmount = minAmount;
-        auctionDetails.currentTimeSeconds = timestamp;
-
-        uint256 remainingDurationSeconds = order.expirationTimeSeconds-timestamp;
-        if (timestamp < auctionBeginTimeSeconds) {
-            // If the auction has not yet begun the current amount is the auctionBeginAmount
-            auctionDetails.currentAmount = auctionBeginAmount;
-        } else if (timestamp >= order.expirationTimeSeconds) {
-            // If the auction has ended the current amount is the minAmount.
-            // Auction end time is guaranteed by 0x Exchange due to the order expiration
-            auctionDetails.currentAmount = minAmount;
-        } else {
-            auctionDetails.currentAmount = safeAdd(
-                minAmount,
-                safeDiv(
-                    safeMul(remainingDurationSeconds, amountDelta),
-                    auctionDurationSeconds
-                )
-            );
-        }
-        return auctionDetails;
-    }
-}
diff --git a/contracts/extensions/contracts/Forwarder/Forwarder.sol b/contracts/extensions/contracts/Forwarder/Forwarder.sol
deleted file mode 100644
index 94dec40ed..000000000
--- a/contracts/extensions/contracts/Forwarder/Forwarder.sol
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity 0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "./MixinWeth.sol";
-import "./MixinForwarderCore.sol";
-import "./libs/LibConstants.sol";
-import "./MixinAssets.sol";
-import "./MixinExchangeWrapper.sol";
-
-
-// solhint-disable no-empty-blocks
-contract Forwarder is
-    LibConstants,
-    MixinWeth,
-    MixinAssets,
-    MixinExchangeWrapper,
-    MixinForwarderCore
-{
-    constructor (
-        address _exchange,
-        bytes memory _zrxAssetData,
-        bytes memory _wethAssetData
-    )
-        public
-        LibConstants(
-            _exchange,
-            _zrxAssetData,
-            _wethAssetData
-        )
-        MixinForwarderCore()
-    {}
-}
diff --git a/contracts/extensions/contracts/Forwarder/MixinAssets.sol b/contracts/extensions/contracts/Forwarder/MixinAssets.sol
deleted file mode 100644
index 116cdf267..000000000
--- a/contracts/extensions/contracts/Forwarder/MixinAssets.sol
+++ /dev/null
@@ -1,143 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC20Token/IERC20Token.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC721Token/IERC721Token.sol";
-import "./libs/LibConstants.sol";
-import "./mixins/MAssets.sol";
-
-
-contract MixinAssets is
-    Ownable,
-    LibConstants,
-    MAssets
-{
-    using LibBytes for bytes;
-
-    bytes4 constant internal ERC20_TRANSFER_SELECTOR = bytes4(keccak256("transfer(address,uint256)"));
-
-    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to 
-    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be
-    ///      used to withdraw assets that were accidentally sent to this contract.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of ERC20 token to withdraw.
-    function withdrawAsset(
-        bytes assetData,
-        uint256 amount
-    )
-        external
-        onlyOwner
-    {
-        transferAssetToSender(assetData, amount);
-    }
-
-    /// @dev Transfers given amount of asset to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferAssetToSender(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        bytes4 proxyId = assetData.readBytes4(0);
-
-        if (proxyId == ERC20_DATA_ID) {
-            transferERC20Token(assetData, amount);
-        } else if (proxyId == ERC721_DATA_ID) {
-            transferERC721Token(assetData, amount);
-        } else {
-            revert("UNSUPPORTED_ASSET_PROXY");
-        }
-    }
-
-    /// @dev Decodes ERC20 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC20Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        address token = assetData.readAddress(16);
-
-        // Transfer tokens.
-        // We do a raw call so we can check the success separate
-        // from the return data.
-        bool success = token.call(abi.encodeWithSelector(
-            ERC20_TRANSFER_SELECTOR,
-            msg.sender,
-            amount
-        ));
-        require(
-            success,
-            "TRANSFER_FAILED"
-        );
-        
-        // Check return data.
-        // If there is no return data, we assume the token incorrectly
-        // does not return a bool. In this case we expect it to revert
-        // on failure, which was handled above.
-        // If the token does return data, we require that it is a single
-        // value that evaluates to true.
-        assembly {
-            if returndatasize {
-                success := 0
-                if eq(returndatasize, 32) {
-                    // First 64 bytes of memory are reserved scratch space
-                    returndatacopy(0, 0, 32)
-                    success := mload(0)
-                }
-            }
-        }
-        require(
-            success,
-            "TRANSFER_FAILED"
-        );
-    }
-
-    /// @dev Decodes ERC721 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC721Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        require(
-            amount == 1,
-            "INVALID_AMOUNT"
-        );
-        // Decode asset data.
-        address token = assetData.readAddress(16);
-        uint256 tokenId = assetData.readUint256(36);
-
-        // Perform transfer.
-        IERC721Token(token).transferFrom(
-            address(this),
-            msg.sender,
-            tokenId
-        );
-    }
-}
diff --git a/contracts/extensions/contracts/Forwarder/MixinExchangeWrapper.sol b/contracts/extensions/contracts/Forwarder/MixinExchangeWrapper.sol
deleted file mode 100644
index cab26741d..000000000
--- a/contracts/extensions/contracts/Forwarder/MixinExchangeWrapper.sol
+++ /dev/null
@@ -1,260 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "./libs/LibConstants.sol";
-import "./mixins/MExchangeWrapper.sol";
-import "@0x/contracts-libs/contracts/libs/LibAbiEncoder.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-libs/contracts/libs/LibFillResults.sol";
-import "@0x/contracts-libs/contracts/libs/LibMath.sol";
-
-
-contract MixinExchangeWrapper is
-    LibAbiEncoder,
-    LibFillResults,
-    LibMath,
-    LibConstants,
-    MExchangeWrapper
-{
-    /// @dev Fills the input order.
-    ///      Returns false if the transaction would otherwise revert.
-    /// @param order Order struct containing order specifications.
-    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
-    /// @param signature Proof that order has been created by maker.
-    /// @return Amounts filled and fees paid by maker and taker.
-    function fillOrderNoThrow(
-        LibOrder.Order memory order,
-        uint256 takerAssetFillAmount,
-        bytes memory signature
-    )
-        internal
-        returns (FillResults memory fillResults)
-    {
-        // ABI encode calldata for `fillOrder`
-        bytes memory fillOrderCalldata = abiEncodeFillOrder(
-            order,
-            takerAssetFillAmount,
-            signature
-        );
-
-        address exchange = address(EXCHANGE);
-
-        // Call `fillOrder` and handle any exceptions gracefully
-        assembly {
-            let success := call(
-                gas,                                // forward all gas
-                exchange,                           // call address of Exchange contract
-                0,                                  // transfer 0 wei
-                add(fillOrderCalldata, 32),         // pointer to start of input (skip array length in first 32 bytes)
-                mload(fillOrderCalldata),           // length of input
-                fillOrderCalldata,                  // write output over input
-                128                                 // output size is 128 bytes
-            )
-            if success {
-                mstore(fillResults, mload(fillOrderCalldata))
-                mstore(add(fillResults, 32), mload(add(fillOrderCalldata, 32)))
-                mstore(add(fillResults, 64), mload(add(fillOrderCalldata, 64)))
-                mstore(add(fillResults, 96), mload(add(fillOrderCalldata, 96)))
-            }
-        }
-        // fillResults values will be 0 by default if call was unsuccessful
-        return fillResults;
-    }
-
-    /// @dev Synchronously executes multiple calls of fillOrder until total amount of WETH has been sold by taker.
-    ///      Returns false if the transaction would otherwise revert.
-    /// @param orders Array of order specifications.
-    /// @param wethSellAmount Desired amount of WETH to sell.
-    /// @param signatures Proofs that orders have been signed by makers.
-    /// @return Amounts filled and fees paid by makers and taker.
-    function marketSellWeth(
-        LibOrder.Order[] memory orders,
-        uint256 wethSellAmount,
-        bytes[] memory signatures
-    )
-        internal
-        returns (FillResults memory totalFillResults)
-    {
-        bytes memory makerAssetData = orders[0].makerAssetData;
-        bytes memory wethAssetData = WETH_ASSET_DATA;
-
-        uint256 ordersLength = orders.length;
-        for (uint256 i = 0; i != ordersLength; i++) {
-
-            // We assume that asset being bought by taker is the same for each order.
-            // We assume that asset being sold by taker is WETH for each order.
-            orders[i].makerAssetData = makerAssetData;
-            orders[i].takerAssetData = wethAssetData;
-
-            // Calculate the remaining amount of WETH to sell
-            uint256 remainingTakerAssetFillAmount = safeSub(wethSellAmount, totalFillResults.takerAssetFilledAmount);
-
-            // Attempt to sell the remaining amount of WETH
-            FillResults memory singleFillResults = fillOrderNoThrow(
-                orders[i],
-                remainingTakerAssetFillAmount,
-                signatures[i]
-            );
-
-            // Update amounts filled and fees paid by maker and taker
-            addFillResults(totalFillResults, singleFillResults);
-
-            // Stop execution if the entire amount of takerAsset has been sold
-            if (totalFillResults.takerAssetFilledAmount >= wethSellAmount) {
-                break;
-            }
-        }
-        return totalFillResults;
-    }
-
-    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.
-    ///      Returns false if the transaction would otherwise revert.
-    ///      The asset being sold by taker must always be WETH.
-    /// @param orders Array of order specifications.
-    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.
-    /// @param signatures Proofs that orders have been signed by makers.
-    /// @return Amounts filled and fees paid by makers and taker.
-    function marketBuyExactAmountWithWeth(
-        LibOrder.Order[] memory orders,
-        uint256 makerAssetFillAmount,
-        bytes[] memory signatures
-    )
-        internal
-        returns (FillResults memory totalFillResults)
-    {
-        bytes memory makerAssetData = orders[0].makerAssetData;
-        bytes memory wethAssetData = WETH_ASSET_DATA;
-
-        uint256 ordersLength = orders.length;
-        for (uint256 i = 0; i != ordersLength; i++) {
-
-            // We assume that asset being bought by taker is the same for each order.
-            // We assume that asset being sold by taker is WETH for each order.
-            orders[i].makerAssetData = makerAssetData;
-            orders[i].takerAssetData = wethAssetData;
-
-            // Calculate the remaining amount of makerAsset to buy
-            uint256 remainingMakerAssetFillAmount = safeSub(makerAssetFillAmount, totalFillResults.makerAssetFilledAmount);
-
-            // Convert the remaining amount of makerAsset to buy into remaining amount
-            // of takerAsset to sell, assuming entire amount can be sold in the current order.
-            // We round up because the exchange rate computed by fillOrder rounds in favor
-            // of the Maker. In this case we want to overestimate the amount of takerAsset.
-            uint256 remainingTakerAssetFillAmount = getPartialAmountCeil(
-                orders[i].takerAssetAmount,
-                orders[i].makerAssetAmount,
-                remainingMakerAssetFillAmount
-            );
-
-            // Attempt to sell the remaining amount of takerAsset
-            FillResults memory singleFillResults = fillOrderNoThrow(
-                orders[i],
-                remainingTakerAssetFillAmount,
-                signatures[i]
-            );
-
-            // Update amounts filled and fees paid by maker and taker
-            addFillResults(totalFillResults, singleFillResults);
-
-            // Stop execution if the entire amount of makerAsset has been bought
-            uint256 makerAssetFilledAmount = totalFillResults.makerAssetFilledAmount;
-            if (makerAssetFilledAmount >= makerAssetFillAmount) {
-                break;
-            }
-        }
-
-        require(
-            makerAssetFilledAmount >= makerAssetFillAmount,
-            "COMPLETE_FILL_FAILED"
-        );
-        return totalFillResults;
-    }
-
-    /// @dev Buys zrxBuyAmount of ZRX fee tokens, taking into account ZRX fees for each order. This will guarantee
-    ///      that at least zrxBuyAmount of ZRX is purchased (sometimes slightly over due to rounding issues).
-    ///      It is possible that a request to buy 200 ZRX will require purchasing 202 ZRX
-    ///      as 2 ZRX is required to purchase the 200 ZRX fee tokens. This guarantees at least 200 ZRX for future purchases.
-    ///      The asset being sold by taker must always be WETH. 
-    /// @param orders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset.
-    /// @param zrxBuyAmount Desired amount of ZRX to buy.
-    /// @param signatures Proofs that orders have been created by makers.
-    /// @return totalFillResults Amounts filled and fees paid by maker and taker.
-    function marketBuyExactZrxWithWeth(
-        LibOrder.Order[] memory orders,
-        uint256 zrxBuyAmount,
-        bytes[] memory signatures
-    )
-        internal
-        returns (FillResults memory totalFillResults)
-    {
-        // Do nothing if zrxBuyAmount == 0
-        if (zrxBuyAmount == 0) {
-            return totalFillResults;
-        }
-
-        bytes memory zrxAssetData = ZRX_ASSET_DATA;
-        bytes memory wethAssetData = WETH_ASSET_DATA;
-        uint256 zrxPurchased = 0;
-
-        uint256 ordersLength = orders.length;
-        for (uint256 i = 0; i != ordersLength; i++) {
-
-            // All of these are ZRX/WETH, so we can drop the respective assetData from calldata.
-            orders[i].makerAssetData = zrxAssetData;
-            orders[i].takerAssetData = wethAssetData;
-
-            // Calculate the remaining amount of ZRX to buy.
-            uint256 remainingZrxBuyAmount = safeSub(zrxBuyAmount, zrxPurchased);
-
-            // Convert the remaining amount of ZRX to buy into remaining amount
-            // of WETH to sell, assuming entire amount can be sold in the current order.
-            // We round up because the exchange rate computed by fillOrder rounds in favor
-            // of the Maker. In this case we want to overestimate the amount of takerAsset.
-            uint256 remainingWethSellAmount = getPartialAmountCeil(
-                orders[i].takerAssetAmount,
-                safeSub(orders[i].makerAssetAmount, orders[i].takerFee),  // our exchange rate after fees 
-                remainingZrxBuyAmount
-            );
-
-            // Attempt to sell the remaining amount of WETH.
-            FillResults memory singleFillResult = fillOrderNoThrow(
-                orders[i],
-                remainingWethSellAmount,
-                signatures[i]
-            );
-
-            // Update amounts filled and fees paid by maker and taker.
-            addFillResults(totalFillResults, singleFillResult);
-            zrxPurchased = safeSub(totalFillResults.makerAssetFilledAmount, totalFillResults.takerFeePaid);
-
-            // Stop execution if the entire amount of ZRX has been bought.
-            if (zrxPurchased >= zrxBuyAmount) {
-                break;
-            }
-        }
-
-        require(
-            zrxPurchased >= zrxBuyAmount,
-            "COMPLETE_FILL_FAILED"
-        );
-        return totalFillResults;
-    }
-}
diff --git a/contracts/extensions/contracts/Forwarder/MixinForwarderCore.sol b/contracts/extensions/contracts/Forwarder/MixinForwarderCore.sol
deleted file mode 100644
index 11c0147a5..000000000
--- a/contracts/extensions/contracts/Forwarder/MixinForwarderCore.sol
+++ /dev/null
@@ -1,214 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "./libs/LibConstants.sol";
-import "./mixins/MWeth.sol";
-import "./mixins/MAssets.sol";
-import "./mixins/MExchangeWrapper.sol";
-import "./interfaces/IForwarderCore.sol";
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-libs/contracts/libs/LibFillResults.sol";
-import "@0x/contracts-libs/contracts/libs/LibMath.sol";
-
-
-contract MixinForwarderCore is
-    LibFillResults,
-    LibMath,
-    LibConstants,
-    MWeth,
-    MAssets,
-    MExchangeWrapper,
-    IForwarderCore
-{
-    using LibBytes for bytes;
-
-    /// @dev Constructor approves ERC20 proxy to transfer ZRX and WETH on this contract's behalf.
-    constructor ()
-        public
-    {
-        address proxyAddress = EXCHANGE.getAssetProxy(ERC20_DATA_ID);
-        require(
-            proxyAddress != address(0),
-            "UNREGISTERED_ASSET_PROXY"
-        );
-        ETHER_TOKEN.approve(proxyAddress, MAX_UINT);
-        ZRX_TOKEN.approve(proxyAddress, MAX_UINT);
-    }
-
-    /// @dev Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.
-    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
-    ///      5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).
-    ///      Any ETH not spent will be refunded to sender.
-    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. 
-    /// @param signatures Proofs that orders have been created by makers.
-    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
-    /// @param feeSignatures Proofs that feeOrders have been created by makers.
-    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-    /// @param feeRecipient Address that will receive ETH when orders are filled.
-    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
-    function marketSellOrdersWithEth(
-        LibOrder.Order[] memory orders,
-        bytes[] memory signatures,
-        LibOrder.Order[] memory feeOrders,
-        bytes[] memory feeSignatures,
-        uint256  feePercentage,
-        address feeRecipient
-    )
-        public
-        payable
-        returns (
-            FillResults memory orderFillResults,
-            FillResults memory feeOrderFillResults
-        )
-    {
-        // Convert ETH to WETH.
-        convertEthToWeth();
-
-        uint256 wethSellAmount;
-        uint256 zrxBuyAmount;
-        uint256 makerAssetAmountPurchased;
-        if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {
-            // Calculate amount of WETH that won't be spent on ETH fees.
-            wethSellAmount = getPartialAmountFloor(
-                PERCENTAGE_DENOMINATOR,
-                safeAdd(PERCENTAGE_DENOMINATOR, feePercentage),
-                msg.value
-            );
-            // Market sell available WETH.
-            // ZRX fees are paid with this contract's balance.
-            orderFillResults = marketSellWeth(
-                orders,
-                wethSellAmount,
-                signatures
-            );
-            // The fee amount must be deducted from the amount transfered back to sender.
-            makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);
-        } else {
-            // 5% of WETH is reserved for filling feeOrders and paying feeRecipient.
-            wethSellAmount = getPartialAmountFloor(
-                MAX_WETH_FILL_PERCENTAGE,
-                PERCENTAGE_DENOMINATOR,
-                msg.value
-            );
-            // Market sell 95% of WETH.
-            // ZRX fees are payed with this contract's balance.
-            orderFillResults = marketSellWeth(
-                orders,
-                wethSellAmount,
-                signatures
-            );
-            // Buy back all ZRX spent on fees.
-            zrxBuyAmount = orderFillResults.takerFeePaid;
-            feeOrderFillResults = marketBuyExactZrxWithWeth(
-                feeOrders,
-                zrxBuyAmount,
-                feeSignatures
-            );
-            makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;
-        }
-
-        // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.
-        // Refund remaining ETH to msg.sender.
-        transferEthFeeAndRefund(
-            orderFillResults.takerAssetFilledAmount,
-            feeOrderFillResults.takerAssetFilledAmount,
-            feePercentage,
-            feeRecipient
-        );
-
-        // Transfer purchased assets to msg.sender.
-        transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);
-    }
-
-    /// @dev Attempt to purchase makerAssetFillAmount of makerAsset by selling ETH provided with transaction.
-    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
-    ///      Any ETH not spent will be refunded to sender.
-    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. 
-    /// @param makerAssetFillAmount Desired amount of makerAsset to purchase.
-    /// @param signatures Proofs that orders have been created by makers.
-    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
-    /// @param feeSignatures Proofs that feeOrders have been created by makers.
-    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-    /// @param feeRecipient Address that will receive ETH when orders are filled.
-    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
-    function marketBuyOrdersWithEth(
-        LibOrder.Order[] memory orders,
-        uint256 makerAssetFillAmount,
-        bytes[] memory signatures,
-        LibOrder.Order[] memory feeOrders,
-        bytes[] memory feeSignatures,
-        uint256  feePercentage,
-        address feeRecipient
-    )
-        public
-        payable
-        returns (
-            FillResults memory orderFillResults,
-            FillResults memory feeOrderFillResults
-        )
-    {
-        // Convert ETH to WETH.
-        convertEthToWeth();
-
-        uint256 zrxBuyAmount;
-        uint256 makerAssetAmountPurchased;
-        if (orders[0].makerAssetData.equals(ZRX_ASSET_DATA)) {
-            // If the makerAsset is ZRX, it is not necessary to pay fees out of this
-            // contracts's ZRX balance because fees are factored into the price of the order.
-            orderFillResults = marketBuyExactZrxWithWeth(
-                orders,
-                makerAssetFillAmount,
-                signatures
-            );
-            // The fee amount must be deducted from the amount transfered back to sender.
-            makerAssetAmountPurchased = safeSub(orderFillResults.makerAssetFilledAmount, orderFillResults.takerFeePaid);
-        } else {
-            // Attemp to purchase desired amount of makerAsset.
-            // ZRX fees are payed with this contract's balance.
-            orderFillResults = marketBuyExactAmountWithWeth(
-                orders,
-                makerAssetFillAmount,
-                signatures
-            );
-            // Buy back all ZRX spent on fees.
-            zrxBuyAmount = orderFillResults.takerFeePaid;
-            feeOrderFillResults = marketBuyExactZrxWithWeth(
-                feeOrders,
-                zrxBuyAmount,
-                feeSignatures
-            );
-            makerAssetAmountPurchased = orderFillResults.makerAssetFilledAmount;
-        }
-
-        // Transfer feePercentage of total ETH spent on primary orders to feeRecipient.
-        // Refund remaining ETH to msg.sender.
-        transferEthFeeAndRefund(
-            orderFillResults.takerAssetFilledAmount,
-            feeOrderFillResults.takerAssetFilledAmount,
-            feePercentage,
-            feeRecipient
-        );
-
-        // Transfer purchased assets to msg.sender.
-        transferAssetToSender(orders[0].makerAssetData, makerAssetAmountPurchased);
-    }
-}
diff --git a/contracts/extensions/contracts/Forwarder/MixinWeth.sol b/contracts/extensions/contracts/Forwarder/MixinWeth.sol
deleted file mode 100644
index 25a35f47b..000000000
--- a/contracts/extensions/contracts/Forwarder/MixinWeth.sol
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contracts-libs/contracts/libs/LibMath.sol";
-import "./libs/LibConstants.sol";
-import "./mixins/MWeth.sol";
-
-
-contract MixinWeth is
-    LibMath,
-    LibConstants,
-    MWeth
-{
-    /// @dev Default payabale function, this allows us to withdraw WETH
-    function ()
-        public
-        payable
-    {
-        require(
-            msg.sender == address(ETHER_TOKEN),
-            "DEFAULT_FUNCTION_WETH_CONTRACT_ONLY"
-        );
-    }
-
-    /// @dev Converts message call's ETH value into WETH.
-    function convertEthToWeth()
-        internal
-    {
-        require(
-            msg.value > 0,
-            "INVALID_MSG_VALUE"
-        );
-        ETHER_TOKEN.deposit.value(msg.value)();
-    }
-
-    /// @dev Transfers feePercentage of WETH spent on primary orders to feeRecipient.
-    ///      Refunds any excess ETH to msg.sender.
-    /// @param wethSoldExcludingFeeOrders Amount of WETH sold when filling primary orders.
-    /// @param wethSoldForZrx Amount of WETH sold when purchasing ZRX required for primary order fees.
-    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-    /// @param feeRecipient Address that will receive ETH when orders are filled.
-    function transferEthFeeAndRefund(
-        uint256 wethSoldExcludingFeeOrders,
-        uint256 wethSoldForZrx,
-        uint256 feePercentage,
-        address feeRecipient
-    )
-        internal
-    {
-        // Ensure feePercentage is less than 5%.
-        require(
-            feePercentage <= MAX_FEE_PERCENTAGE,
-            "FEE_PERCENTAGE_TOO_LARGE"
-        );
-
-        // Ensure that no extra WETH owned by this contract has been sold.
-        uint256 wethSold = safeAdd(wethSoldExcludingFeeOrders, wethSoldForZrx);
-        require(
-            wethSold <= msg.value,
-            "OVERSOLD_WETH"
-        );
-
-        // Calculate amount of WETH that hasn't been sold.
-        uint256 wethRemaining = safeSub(msg.value, wethSold);
-
-        // Calculate ETH fee to pay to feeRecipient.
-        uint256 ethFee = getPartialAmountFloor(
-            feePercentage,
-            PERCENTAGE_DENOMINATOR,
-            wethSoldExcludingFeeOrders
-        );
-
-        // Ensure fee is less than amount of WETH remaining.
-        require(
-            ethFee <= wethRemaining,
-            "INSUFFICIENT_ETH_REMAINING"
-        );
-    
-        // Do nothing if no WETH remaining
-        if (wethRemaining > 0) {
-            // Convert remaining WETH to ETH
-            ETHER_TOKEN.withdraw(wethRemaining);
-
-            // Pay ETH to feeRecipient
-            if (ethFee > 0) {
-                feeRecipient.transfer(ethFee);
-            }
-
-            // Refund remaining ETH to msg.sender.
-            uint256 ethRefund = safeSub(wethRemaining, ethFee);
-            if (ethRefund > 0) {
-                msg.sender.transfer(ethRefund);
-            }
-        }
-    }
-}
diff --git a/contracts/extensions/contracts/Forwarder/interfaces/IAssets.sol b/contracts/extensions/contracts/Forwarder/interfaces/IAssets.sol
deleted file mode 100644
index cebfd3706..000000000
--- a/contracts/extensions/contracts/Forwarder/interfaces/IAssets.sol
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-
-contract IAssets {
-
-    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to 
-    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be
-    ///      used to withdraw assets that were accidentally sent to this contract.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of ERC20 token to withdraw.
-    function withdrawAsset(
-        bytes assetData,
-        uint256 amount
-    )
-        external;
-}
diff --git a/contracts/extensions/contracts/Forwarder/interfaces/IForwarder.sol b/contracts/extensions/contracts/Forwarder/interfaces/IForwarder.sol
deleted file mode 100644
index 6ce8a1d31..000000000
--- a/contracts/extensions/contracts/Forwarder/interfaces/IForwarder.sol
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "./IForwarderCore.sol";
-import "./IAssets.sol";
-
-
-// solhint-disable no-empty-blocks
-contract IForwarder is
-    IForwarderCore,
-    IAssets
-{}
diff --git a/contracts/extensions/contracts/Forwarder/interfaces/IForwarderCore.sol b/contracts/extensions/contracts/Forwarder/interfaces/IForwarderCore.sol
deleted file mode 100644
index 7f62722e7..000000000
--- a/contracts/extensions/contracts/Forwarder/interfaces/IForwarderCore.sol
+++ /dev/null
@@ -1,80 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-libs/contracts/libs/LibFillResults.sol";
-
-
-contract IForwarderCore {
-
-    /// @dev Purchases as much of orders' makerAssets as possible by selling up to 95% of transaction's ETH value.
-    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
-    ///      5% of ETH value is reserved for paying fees to order feeRecipients (in ZRX) and forwarding contract feeRecipient (in ETH).
-    ///      Any ETH not spent will be refunded to sender.
-    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. 
-    /// @param signatures Proofs that orders have been created by makers.
-    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
-    /// @param feeSignatures Proofs that feeOrders have been created by makers.
-    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-    /// @param feeRecipient Address that will receive ETH when orders are filled.
-    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
-    function marketSellOrdersWithEth(
-        LibOrder.Order[] memory orders,
-        bytes[] memory signatures,
-        LibOrder.Order[] memory feeOrders,
-        bytes[] memory feeSignatures,
-        uint256  feePercentage,
-        address feeRecipient
-    )
-        public
-        payable
-        returns (
-            LibFillResults.FillResults memory orderFillResults,
-            LibFillResults.FillResults memory feeOrderFillResults
-        );
-
-    /// @dev Attempt to purchase makerAssetFillAmount of makerAsset by selling ETH provided with transaction.
-    ///      Any ZRX required to pay fees for primary orders will automatically be purchased by this contract.
-    ///      Any ETH not spent will be refunded to sender.
-    /// @param orders Array of order specifications used containing desired makerAsset and WETH as takerAsset. 
-    /// @param makerAssetFillAmount Desired amount of makerAsset to purchase.
-    /// @param signatures Proofs that orders have been created by makers.
-    /// @param feeOrders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset. Used to purchase ZRX for primary order fees.
-    /// @param feeSignatures Proofs that feeOrders have been created by makers.
-    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-    /// @param feeRecipient Address that will receive ETH when orders are filled.
-    /// @return Amounts filled and fees paid by maker and taker for both sets of orders.
-    function marketBuyOrdersWithEth(
-        LibOrder.Order[] memory orders,
-        uint256 makerAssetFillAmount,
-        bytes[] memory signatures,
-        LibOrder.Order[] memory feeOrders,
-        bytes[] memory feeSignatures,
-        uint256  feePercentage,
-        address feeRecipient
-    )
-        public
-        payable
-        returns (
-            LibFillResults.FillResults memory orderFillResults,
-            LibFillResults.FillResults memory feeOrderFillResults
-        );
-}
diff --git a/contracts/extensions/contracts/Forwarder/libs/LibConstants.sol b/contracts/extensions/contracts/Forwarder/libs/LibConstants.sol
deleted file mode 100644
index 0d2f6e36d..000000000
--- a/contracts/extensions/contracts/Forwarder/libs/LibConstants.sol
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-import "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-import "@0x/contracts-tokens/contracts/tokens/EtherToken/IEtherToken.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC20Token/IERC20Token.sol";
-
-
-contract LibConstants {
-
-    using LibBytes for bytes;
-
-    bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256("ERC20Token(address)"));
-    bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256("ERC721Token(address,uint256)"));
-    uint256 constant internal MAX_UINT = 2**256 - 1;
-    uint256 constant internal PERCENTAGE_DENOMINATOR = 10**18; 
-    uint256 constant internal MAX_FEE_PERCENTAGE = 5 * PERCENTAGE_DENOMINATOR / 100;         // 5%
-    uint256 constant internal MAX_WETH_FILL_PERCENTAGE = 95 * PERCENTAGE_DENOMINATOR / 100;  // 95%
- 
-     // solhint-disable var-name-mixedcase
-    IExchange internal EXCHANGE;
-    IEtherToken internal ETHER_TOKEN;
-    IERC20Token internal ZRX_TOKEN;
-    bytes internal ZRX_ASSET_DATA;
-    bytes internal WETH_ASSET_DATA;
-    // solhint-enable var-name-mixedcase
-
-    constructor (
-        address _exchange,
-        bytes memory _zrxAssetData,
-        bytes memory _wethAssetData
-    )
-        public
-    {
-        EXCHANGE = IExchange(_exchange);
-        ZRX_ASSET_DATA = _zrxAssetData;
-        WETH_ASSET_DATA = _wethAssetData;
-
-        address etherToken = _wethAssetData.readAddress(16);
-        address zrxToken = _zrxAssetData.readAddress(16);
-        ETHER_TOKEN = IEtherToken(etherToken);
-        ZRX_TOKEN = IERC20Token(zrxToken);
-    }
-}
diff --git a/contracts/extensions/contracts/Forwarder/libs/LibForwarderErrors.sol b/contracts/extensions/contracts/Forwarder/libs/LibForwarderErrors.sol
deleted file mode 100644
index 7a95b78a0..000000000
--- a/contracts/extensions/contracts/Forwarder/libs/LibForwarderErrors.sol
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-// solhint-disable
-pragma solidity ^0.4.24;
-
-
-/// This contract is intended to serve as a reference, but is not actually used for efficiency reasons.
-contract LibForwarderErrors {
-    string constant FEE_PERCENTAGE_TOO_LARGE = "FEE_PROPORTION_TOO_LARGE";                        // Provided fee percentage greater than 5%.
-    string constant INSUFFICIENT_ETH_REMAINING = "INSUFFICIENT_ETH_REMAINING";                    // Not enough ETH remaining to pay feeRecipient.
-    string constant OVERSOLD_WETH = "OVERSOLD_WETH";                                              // More WETH sold than provided with current message call.
-    string constant COMPLETE_FILL_FAILED = "COMPLETE_FILL_FAILED";                                // Desired purchase amount not completely filled (required for ZRX fees only).
-    string constant TRANSFER_FAILED = "TRANSFER_FAILED";                                          // Asset transfer failed.
-    string constant UNSUPPORTED_ASSET_PROXY = "UNSUPPORTED_ASSET_PROXY";                          // Proxy in assetData not supported.
-    string constant DEFAULT_FUNCTION_WETH_CONTRACT_ONLY = "DEFAULT_FUNCTION_WETH_CONTRACT_ONLY";  // Fallback function may only be used for WETH withdrawals.
-    string constant INVALID_MSG_VALUE = "INVALID_MSG_VALUE";                                      // msg.value must be greater than 0.
-    string constant INVALID_AMOUNT = "INVALID_AMOUNT";                                            // Amount must equal 1.
-}
diff --git a/contracts/extensions/contracts/Forwarder/mixins/MAssets.sol b/contracts/extensions/contracts/Forwarder/mixins/MAssets.sol
deleted file mode 100644
index 1757b37fb..000000000
--- a/contracts/extensions/contracts/Forwarder/mixins/MAssets.sol
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "../interfaces/IAssets.sol";
-
-
-contract MAssets is
-    IAssets
-{
-    /// @dev Transfers given amount of asset to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferAssetToSender(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-
-    /// @dev Decodes ERC20 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC20Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-
-    /// @dev Decodes ERC721 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC721Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-}
diff --git a/contracts/extensions/contracts/Forwarder/mixins/MExchangeWrapper.sol b/contracts/extensions/contracts/Forwarder/mixins/MExchangeWrapper.sol
deleted file mode 100644
index 143f888b1..000000000
--- a/contracts/extensions/contracts/Forwarder/mixins/MExchangeWrapper.sol
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-libs/contracts/libs/LibFillResults.sol";
-
-
-contract MExchangeWrapper {
-
-    /// @dev Fills the input order.
-    ///      Returns false if the transaction would otherwise revert.
-    /// @param order Order struct containing order specifications.
-    /// @param takerAssetFillAmount Desired amount of takerAsset to sell.
-    /// @param signature Proof that order has been created by maker.
-    /// @return Amounts filled and fees paid by maker and taker.
-    function fillOrderNoThrow(
-        LibOrder.Order memory order,
-        uint256 takerAssetFillAmount,
-        bytes memory signature
-    )
-        internal
-        returns (LibFillResults.FillResults memory fillResults);
-
-    /// @dev Synchronously executes multiple calls of fillOrder until total amount of WETH has been sold by taker.
-    ///      Returns false if the transaction would otherwise revert.
-    /// @param orders Array of order specifications.
-    /// @param wethSellAmount Desired amount of WETH to sell.
-    /// @param signatures Proofs that orders have been signed by makers.
-    /// @return Amounts filled and fees paid by makers and taker.
-    function marketSellWeth(
-        LibOrder.Order[] memory orders,
-        uint256 wethSellAmount,
-        bytes[] memory signatures
-    )
-        internal
-        returns (LibFillResults.FillResults memory totalFillResults);
-
-    /// @dev Synchronously executes multiple fill orders in a single transaction until total amount is bought by taker.
-    ///      Returns false if the transaction would otherwise revert.
-    ///      The asset being sold by taker must always be WETH.
-    /// @param orders Array of order specifications.
-    /// @param makerAssetFillAmount Desired amount of makerAsset to buy.
-    /// @param signatures Proofs that orders have been signed by makers.
-    /// @return Amounts filled and fees paid by makers and taker.
-    function marketBuyExactAmountWithWeth(
-        LibOrder.Order[] memory orders,
-        uint256 makerAssetFillAmount,
-        bytes[] memory signatures
-    )
-        internal
-        returns (LibFillResults.FillResults memory totalFillResults);
-
-    /// @dev Buys zrxBuyAmount of ZRX fee tokens, taking into account ZRX fees for each order. This will guarantee
-    ///      that at least zrxBuyAmount of ZRX is purchased (sometimes slightly over due to rounding issues).
-    ///      It is possible that a request to buy 200 ZRX will require purchasing 202 ZRX
-    ///      as 2 ZRX is required to purchase the 200 ZRX fee tokens. This guarantees at least 200 ZRX for future purchases.
-    ///      The asset being sold by taker must always be WETH. 
-    /// @param orders Array of order specifications containing ZRX as makerAsset and WETH as takerAsset.
-    /// @param zrxBuyAmount Desired amount of ZRX to buy.
-    /// @param signatures Proofs that orders have been created by makers.
-    /// @return totalFillResults Amounts filled and fees paid by maker and taker.
-    function marketBuyExactZrxWithWeth(
-        LibOrder.Order[] memory orders,
-        uint256 zrxBuyAmount,
-        bytes[] memory signatures
-    )
-        internal
-        returns (LibFillResults.FillResults memory totalFillResults);
-}
diff --git a/contracts/extensions/contracts/Forwarder/mixins/MWeth.sol b/contracts/extensions/contracts/Forwarder/mixins/MWeth.sol
deleted file mode 100644
index 15d66942f..000000000
--- a/contracts/extensions/contracts/Forwarder/mixins/MWeth.sol
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-
-contract MWeth {
-
-    /// @dev Converts message call's ETH value into WETH.
-    function convertEthToWeth()
-        internal;
-
-    /// @dev Transfers feePercentage of WETH spent on primary orders to feeRecipient.
-    ///      Refunds any excess ETH to msg.sender.
-    /// @param wethSoldExcludingFeeOrders Amount of WETH sold when filling primary orders.
-    /// @param wethSoldForZrx Amount of WETH sold when purchasing ZRX required for primary order fees.
-    /// @param feePercentage Percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-    /// @param feeRecipient Address that will receive ETH when orders are filled.
-    function transferEthFeeAndRefund(
-        uint256 wethSoldExcludingFeeOrders,
-        uint256 wethSoldForZrx,
-        uint256 feePercentage,
-        address feeRecipient
-    )
-        internal;
-}
diff --git a/contracts/extensions/contracts/OrderMatcher/MixinAssets.sol b/contracts/extensions/contracts/OrderMatcher/MixinAssets.sol
deleted file mode 100644
index f0f91cfc0..000000000
--- a/contracts/extensions/contracts/OrderMatcher/MixinAssets.sol
+++ /dev/null
@@ -1,195 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC20Token/IERC20Token.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC721Token/IERC721Token.sol";
-import "./mixins/MAssets.sol";
-import "./libs/LibConstants.sol";
-
-
-contract MixinAssets is
-    MAssets,
-    Ownable,
-    LibConstants
-{
-    using LibBytes for bytes;
-
-    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to 
-    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be
-    ///      used to withdraw assets that were accidentally sent to this contract.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to withdraw.
-    function withdrawAsset(
-        bytes assetData,
-        uint256 amount
-    )
-        external
-        onlyOwner
-    {
-        transferAssetToSender(assetData, amount);
-    }
-
-    /// @dev Approves or disapproves an AssetProxy to spend asset.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to approve for respective proxy.
-    function approveAssetProxy(
-        bytes assetData,
-        uint256 amount
-    )
-        external
-        onlyOwner
-    {
-        bytes4 proxyId = assetData.readBytes4(0);
-
-        if (proxyId == ERC20_DATA_ID) {
-            approveERC20Token(assetData, amount);
-        } else if (proxyId == ERC721_DATA_ID) {
-            approveERC721Token(assetData, amount);
-        } else {
-            revert("UNSUPPORTED_ASSET_PROXY");
-        }
-    }
-
-    /// @dev Transfers given amount of asset to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferAssetToSender(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        bytes4 proxyId = assetData.readBytes4(0);
-
-        if (proxyId == ERC20_DATA_ID) {
-            transferERC20Token(assetData, amount);
-        } else if (proxyId == ERC721_DATA_ID) {
-            transferERC721Token(assetData, amount);
-        } else {
-            revert("UNSUPPORTED_ASSET_PROXY");
-        }
-    }
-
-    /// @dev Decodes ERC20 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC20Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        // 4 byte id + 12 0 bytes before ABI encoded token address.
-        address token = assetData.readAddress(16);
-
-        // Transfer tokens.
-        // We do a raw call so we can check the success separate
-        // from the return data.
-        bool success = token.call(abi.encodeWithSelector(
-            ERC20_TRANSFER_SELECTOR,
-            msg.sender,
-            amount
-        ));
-        require(
-            success,
-            "TRANSFER_FAILED"
-        );
-        
-        // Check return data.
-        // If there is no return data, we assume the token incorrectly
-        // does not return a bool. In this case we expect it to revert
-        // on failure, which was handled above.
-        // If the token does return data, we require that it is a single
-        // value that evaluates to true.
-        assembly {
-            if returndatasize {
-                success := 0
-                if eq(returndatasize, 32) {
-                    // First 64 bytes of memory are reserved scratch space
-                    returndatacopy(0, 0, 32)
-                    success := mload(0)
-                }
-            }
-        }
-        require(
-            success,
-            "TRANSFER_FAILED"
-        );
-    }
-
-    /// @dev Decodes ERC721 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC721Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        require(
-            amount == 1,
-            "INVALID_AMOUNT"
-        );
-        // Decode asset data.
-        // 4 byte id + 12 0 bytes before ABI encoded token address.
-        address token = assetData.readAddress(16);
-        // 4 byte id + 32 byte ABI encoded token address before token id.
-        uint256 tokenId = assetData.readUint256(36);
-
-        // Perform transfer.
-        IERC721Token(token).transferFrom(
-            address(this),
-            msg.sender,
-            tokenId
-        );
-    }
-
-    /// @dev Sets approval for ERC20 AssetProxy.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to approve for respective proxy.
-    function approveERC20Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        address token = assetData.readAddress(16);
-        require(
-            IERC20Token(token).approve(ERC20_PROXY_ADDRESS, amount),
-            "APPROVAL_FAILED"
-        );
-    }
-
-    /// @dev Sets approval for ERC721 AssetProxy.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to approve for respective proxy.
-    function approveERC721Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal
-    {
-        address token = assetData.readAddress(16);
-        bool approval = amount >= 1;
-        IERC721Token(token).setApprovalForAll(ERC721_PROXY_ADDRESS, approval);
-    }
-}
diff --git a/contracts/extensions/contracts/OrderMatcher/MixinMatchOrders.sol b/contracts/extensions/contracts/OrderMatcher/MixinMatchOrders.sol
deleted file mode 100644
index 1787deb59..000000000
--- a/contracts/extensions/contracts/OrderMatcher/MixinMatchOrders.sol
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "./libs/LibConstants.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-libs/contracts/libs/LibFillResults.sol";
-import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
-
-
-contract MixinMatchOrders is
-    Ownable,
-    LibConstants
-{
-    /// @dev Match two complementary orders that have a profitable spread.
-    ///      Each order is filled at their respective price point. However, the calculations are
-    ///      carried out as though the orders are both being filled at the right order's price point.
-    ///      The profit made by the left order is then used to fill the right order as much as possible.
-    ///      This results in a spread being taken in terms of both assets. The spread is held within this contract.
-    /// @param leftOrder First order to match.
-    /// @param rightOrder Second order to match.
-    /// @param leftSignature Proof that order was created by the left maker.
-    /// @param rightSignature Proof that order was created by the right maker.
-    function matchOrders(
-        LibOrder.Order memory leftOrder,
-        LibOrder.Order memory rightOrder,
-        bytes memory leftSignature,
-        bytes memory rightSignature
-    )
-        public
-        onlyOwner
-    {
-        // Match orders, maximally filling `leftOrder`
-        LibFillResults.MatchedFillResults memory matchedFillResults = EXCHANGE.matchOrders(
-            leftOrder,
-            rightOrder,
-            leftSignature,
-            rightSignature
-        );
-
-        uint256 leftMakerAssetSpreadAmount = matchedFillResults.leftMakerAssetSpreadAmount;
-        uint256 rightOrderTakerAssetAmount = rightOrder.takerAssetAmount;
-
-        // Do not attempt to call `fillOrder` if no spread was taken or `rightOrder` has been completely filled
-        if (leftMakerAssetSpreadAmount == 0 || matchedFillResults.right.takerAssetFilledAmount == rightOrderTakerAssetAmount) {
-            return;
-        }
-
-        // The `assetData` fields of the `rightOrder` could have been null for the `matchOrders` call. We reassign them before calling `fillOrder`.
-        rightOrder.makerAssetData = leftOrder.takerAssetData;
-        rightOrder.takerAssetData = leftOrder.makerAssetData;
-
-        // Query `rightOrder` info to check if it has been completely filled
-        // We need to make this check in case the `rightOrder` was partially filled before the `matchOrders` call
-        LibOrder.OrderInfo memory orderInfo = EXCHANGE.getOrderInfo(rightOrder);
-
-        // Do not attempt to call `fillOrder` if order has been completely filled
-        if (orderInfo.orderTakerAssetFilledAmount == rightOrderTakerAssetAmount) {
-            return;
-        }
-
-        // We do not need to pass in a signature since it was already validated in the `matchOrders` call
-        EXCHANGE.fillOrder(
-            rightOrder,
-            leftMakerAssetSpreadAmount,
-            ""
-        );
-    }
-}
diff --git a/contracts/extensions/contracts/OrderMatcher/OrderMatcher.sol b/contracts/extensions/contracts/OrderMatcher/OrderMatcher.sol
deleted file mode 100644
index 4879b7bca..000000000
--- a/contracts/extensions/contracts/OrderMatcher/OrderMatcher.sol
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity 0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
-import "./libs/LibConstants.sol";
-import "./MixinMatchOrders.sol";
-import "./MixinAssets.sol";
-
-
-// solhint-disable no-empty-blocks
-contract OrderMatcher is
-    MixinMatchOrders,
-    MixinAssets
-{
-    constructor (address _exchange)
-        public
-        LibConstants(_exchange)
-        Ownable()
-    {}
-}
diff --git a/contracts/extensions/contracts/OrderMatcher/interfaces/IAssets.sol b/contracts/extensions/contracts/OrderMatcher/interfaces/IAssets.sol
deleted file mode 100644
index 9fcc0023a..000000000
--- a/contracts/extensions/contracts/OrderMatcher/interfaces/IAssets.sol
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-
-contract IAssets {
-
-    /// @dev Withdraws assets from this contract. The contract requires a ZRX balance in order to 
-    ///      function optimally, and this function allows the ZRX to be withdrawn by owner. It may also be
-    ///      used to withdraw assets that were accidentally sent to this contract.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to withdraw.
-    function withdrawAsset(
-        bytes assetData,
-        uint256 amount
-    )
-        external;
-
-    /// @dev Approves or disapproves an AssetProxy to spend asset.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to approve for respective proxy.
-    function approveAssetProxy(
-        bytes assetData,
-        uint256 amount
-    )
-        external;
-}
diff --git a/contracts/extensions/contracts/OrderMatcher/interfaces/IMatchOrders.sol b/contracts/extensions/contracts/OrderMatcher/interfaces/IMatchOrders.sol
deleted file mode 100644
index 1443c73b9..000000000
--- a/contracts/extensions/contracts/OrderMatcher/interfaces/IMatchOrders.sol
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-
-
-contract IMatchOrders {
-
-    /// @dev Match two complementary orders that have a profitable spread.
-    ///      Each order is filled at their respective price point. However, the calculations are
-    ///      carried out as though the orders are both being filled at the right order's price point.
-    ///      The profit made by the left order is then used to fill the right order as much as possible.
-    ///      This results in a spread being taken in terms of both assets. The spread is held within this contract.
-    /// @param leftOrder First order to match.
-    /// @param rightOrder Second order to match.
-    /// @param leftSignature Proof that order was created by the left maker.
-    /// @param rightSignature Proof that order was created by the right maker.
-    function matchOrders(
-        LibOrder.Order memory leftOrder,
-        LibOrder.Order memory rightOrder,
-        bytes memory leftSignature,
-        bytes memory rightSignature
-    )
-        public;
-}
diff --git a/contracts/extensions/contracts/OrderMatcher/interfaces/IOrderMatcher.sol b/contracts/extensions/contracts/OrderMatcher/interfaces/IOrderMatcher.sol
deleted file mode 100644
index 75f26dca6..000000000
--- a/contracts/extensions/contracts/OrderMatcher/interfaces/IOrderMatcher.sol
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contract-utils/contracts/utils/Ownable/IOwnable.sol";
-import "./IMatchOrders.sol";
-import "./IAssets.sol";
-
-
-// solhint-disable no-empty-blocks
-contract IOrderMatcher is
-    IOwnable,
-    IMatchOrders,
-    IAssets
-{}
diff --git a/contracts/extensions/contracts/OrderMatcher/libs/LibConstants.sol b/contracts/extensions/contracts/OrderMatcher/libs/LibConstants.sol
deleted file mode 100644
index c1a86a9c7..000000000
--- a/contracts/extensions/contracts/OrderMatcher/libs/LibConstants.sol
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-
-
-contract LibConstants {
-
-    // bytes4(keccak256("transfer(address,uint256)"))
-    bytes4 constant internal ERC20_TRANSFER_SELECTOR = 0xa9059cbb;
-    // bytes4(keccak256("ERC20Token(address)"))
-    bytes4 constant internal ERC20_DATA_ID = 0xf47261b0;
-    // bytes4(keccak256("ERC721Token(address,uint256)"))
-    bytes4 constant internal ERC721_DATA_ID = 0x02571792;
- 
-     // solhint-disable var-name-mixedcase
-    IExchange internal EXCHANGE;
-    address internal ERC20_PROXY_ADDRESS;
-    address internal ERC721_PROXY_ADDRESS;
-    // solhint-enable var-name-mixedcase
-
-    constructor (address _exchange)
-        public
-    {
-        EXCHANGE = IExchange(_exchange);
-
-        ERC20_PROXY_ADDRESS = EXCHANGE.getAssetProxy(ERC20_DATA_ID);
-        require(
-            ERC20_PROXY_ADDRESS != address(0),
-            "UNREGISTERED_ASSET_PROXY"
-        );
-
-        ERC721_PROXY_ADDRESS = EXCHANGE.getAssetProxy(ERC721_DATA_ID);
-        require(
-            ERC721_PROXY_ADDRESS != address(0),
-            "UNREGISTERED_ASSET_PROXY"
-        );
-    }
-}
diff --git a/contracts/extensions/contracts/OrderMatcher/mixins/MAssets.sol b/contracts/extensions/contracts/OrderMatcher/mixins/MAssets.sol
deleted file mode 100644
index 6ea7a3290..000000000
--- a/contracts/extensions/contracts/OrderMatcher/mixins/MAssets.sol
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.24;
-
-import "../interfaces/IAssets.sol";
-
-
-contract MAssets is
-    IAssets
-{
-    /// @dev Transfers given amount of asset to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferAssetToSender(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-
-    /// @dev Decodes ERC20 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC20Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-
-    /// @dev Decodes ERC721 assetData and transfers given amount to sender.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to transfer to sender.
-    function transferERC721Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-
-    /// @dev Sets approval for ERC20 AssetProxy.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to approve for respective proxy.
-    function approveERC20Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-
-    /// @dev Sets approval for ERC721 AssetProxy.
-    /// @param assetData Byte array encoded for the respective asset proxy.
-    /// @param amount Amount of asset to approve for respective proxy.
-    function approveERC721Token(
-        bytes memory assetData,
-        uint256 amount
-    )
-        internal;
-}
diff --git a/contracts/extensions/contracts/OrderValidator/OrderValidator.sol b/contracts/extensions/contracts/OrderValidator/OrderValidator.sol
deleted file mode 100644
index 33dd1326c..000000000
--- a/contracts/extensions/contracts/OrderValidator/OrderValidator.sol
+++ /dev/null
@@ -1,218 +0,0 @@
-/*
-
-  Copyright 2018 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity 0.4.24;
-pragma experimental ABIEncoderV2;
-
-import "@0x/contracts-interfaces/contracts/protocol/Exchange/IExchange.sol";
-import "@0x/contracts-libs/contracts/libs/LibOrder.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC20Token/IERC20Token.sol";
-import "@0x/contracts-tokens/contracts/tokens/ERC721Token/IERC721Token.sol";
-import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
-
-
-contract OrderValidator {
-
-    using LibBytes for bytes;
-
-    bytes4 constant internal ERC20_DATA_ID = bytes4(keccak256("ERC20Token(address)"));
-    bytes4 constant internal ERC721_DATA_ID = bytes4(keccak256("ERC721Token(address,uint256)"));
-
-    struct TraderInfo {
-        uint256 makerBalance;       // Maker's balance of makerAsset
-        uint256 makerAllowance;     // Maker's allowance to corresponding AssetProxy
-        uint256 takerBalance;       // Taker's balance of takerAsset
-        uint256 takerAllowance;     // Taker's allowance to corresponding AssetProxy
-        uint256 makerZrxBalance;    // Maker's balance of ZRX
-        uint256 makerZrxAllowance;  // Maker's allowance of ZRX to ERC20Proxy
-        uint256 takerZrxBalance;    // Taker's balance of ZRX
-        uint256 takerZrxAllowance;  // Taker's allowance of ZRX to ERC20Proxy
-    }
-
-    // solhint-disable var-name-mixedcase
-    IExchange internal EXCHANGE;
-    bytes internal ZRX_ASSET_DATA;
-    // solhint-enable var-name-mixedcase
-
-    constructor (address _exchange, bytes memory _zrxAssetData)
-        public
-    {
-        EXCHANGE = IExchange(_exchange);
-        ZRX_ASSET_DATA = _zrxAssetData;
-    }
-
-    /// @dev Fetches information for order and maker/taker of order.
-    /// @param order The order structure.
-    /// @param takerAddress Address that will be filling the order.
-    /// @return OrderInfo and TraderInfo instances for given order.
-    function getOrderAndTraderInfo(LibOrder.Order memory order, address takerAddress)
-        public
-        view
-        returns (LibOrder.OrderInfo memory orderInfo, TraderInfo memory traderInfo)
-    {
-        orderInfo = EXCHANGE.getOrderInfo(order);
-        traderInfo = getTraderInfo(order, takerAddress);
-        return (orderInfo, traderInfo);
-    }
-
-    /// @dev Fetches information for all passed in orders and the makers/takers of each order.
-    /// @param orders Array of order specifications.
-    /// @param takerAddresses Array of taker addresses corresponding to each order.
-    /// @return Arrays of OrderInfo and TraderInfo instances that correspond to each order.
-    function getOrdersAndTradersInfo(LibOrder.Order[] memory orders, address[] memory takerAddresses)
-        public
-        view
-        returns (LibOrder.OrderInfo[] memory ordersInfo, TraderInfo[] memory tradersInfo)
-    {
-        ordersInfo = EXCHANGE.getOrdersInfo(orders);
-        tradersInfo = getTradersInfo(orders, takerAddresses);
-        return (ordersInfo, tradersInfo);
-    }
-
-    /// @dev Fetches balance and allowances for maker and taker of order.
-    /// @param order The order structure.
-    /// @param takerAddress Address that will be filling the order.
-    /// @return Balances and allowances of maker and taker of order.
-    function getTraderInfo(LibOrder.Order memory order, address takerAddress)
-        public
-        view
-        returns (TraderInfo memory traderInfo)
-    {
-        (traderInfo.makerBalance, traderInfo.makerAllowance) = getBalanceAndAllowance(order.makerAddress, order.makerAssetData);
-        (traderInfo.takerBalance, traderInfo.takerAllowance) = getBalanceAndAllowance(takerAddress, order.takerAssetData);
-        bytes memory zrxAssetData = ZRX_ASSET_DATA;
-        (traderInfo.makerZrxBalance, traderInfo.makerZrxAllowance) = getBalanceAndAllowance(order.makerAddress, zrxAssetData);
-        (traderInfo.takerZrxBalance, traderInfo.takerZrxAllowance) = getBalanceAndAllowance(takerAddress, zrxAssetData);
-        return traderInfo;
-    }
-
-    /// @dev Fetches balances and allowances of maker and taker for each provided order.
-    /// @param orders Array of order specifications.
-    /// @param takerAddresses Array of taker addresses corresponding to each order.
-    /// @return Array of balances and allowances for maker and taker of each order.
-    function getTradersInfo(LibOrder.Order[] memory orders, address[] memory takerAddresses)
-        public
-        view
-        returns (TraderInfo[] memory)
-    {
-        uint256 ordersLength = orders.length;
-        TraderInfo[] memory tradersInfo = new TraderInfo[](ordersLength);
-        for (uint256 i = 0; i != ordersLength; i++) {
-            tradersInfo[i] = getTraderInfo(orders[i], takerAddresses[i]);
-        }
-        return tradersInfo;
-    }
-
-    /// @dev Fetches token balances and allowances of an address to given assetProxy. Supports ERC20 and ERC721.
-    /// @param target Address to fetch balances and allowances of.
-    /// @param assetData Encoded data that can be decoded by a specified proxy contract when transferring asset.
-    /// @return Balance of asset and allowance set to given proxy of asset.
-    ///         For ERC721 tokens, these values will always be 1 or 0.
-    function getBalanceAndAllowance(address target, bytes memory assetData)
-        public
-        view
-        returns (uint256 balance, uint256 allowance)
-    {
-        bytes4 assetProxyId = assetData.readBytes4(0);
-        address token = assetData.readAddress(16);
-        address assetProxy = EXCHANGE.getAssetProxy(assetProxyId);
-
-        if (assetProxyId == ERC20_DATA_ID) {
-            // Query balance
-            balance = IERC20Token(token).balanceOf(target);
-
-            // Query allowance
-            allowance = IERC20Token(token).allowance(target, assetProxy);
-        } else if (assetProxyId == ERC721_DATA_ID) {
-            uint256 tokenId = assetData.readUint256(36);
-
-            // Query owner of tokenId
-            address owner = getERC721TokenOwner(token, tokenId);
-
-            // Set balance to 1 if tokenId is owned by target
-            balance = target == owner ? 1 : 0;
-
-            // Check if ERC721Proxy is approved to spend tokenId
-            bool isApproved = IERC721Token(token).isApprovedForAll(target, assetProxy);
-            
-            // Set alowance to 1 if ERC721Proxy is approved to spend tokenId
-            allowance = isApproved ? 1 : 0;
-        } else {
-            revert("UNSUPPORTED_ASSET_PROXY");
-        }
-        return (balance, allowance);
-    }
-
-    /// @dev Fetches token balances and allowances of an address for each given assetProxy. Supports ERC20 and ERC721.
-    /// @param target Address to fetch balances and allowances of.
-    /// @param assetData Array of encoded byte arrays that can be decoded by a specified proxy contract when transferring asset.
-    /// @return Balances and allowances of assets.
-    ///         For ERC721 tokens, these values will always be 1 or 0.
-    function getBalancesAndAllowances(address target, bytes[] memory assetData)
-        public
-        view
-        returns (uint256[] memory, uint256[] memory)
-    {
-        uint256 length = assetData.length;
-        uint256[] memory balances = new uint256[](length);
-        uint256[] memory allowances = new uint256[](length);
-        for (uint256 i = 0; i != length; i++) {
-            (balances[i], allowances[i]) = getBalanceAndAllowance(target, assetData[i]);
-        }
-        return (balances, allowances);
-    }
-
-    /// @dev Calls `token.ownerOf(tokenId)`, but returns a null owner instead of reverting on an unowned token.
-    /// @param token Address of ERC721 token.
-    /// @param tokenId The identifier for the specific NFT.
-    /// @return Owner of tokenId or null address if unowned.
-    function getERC721TokenOwner(address token, uint256 tokenId)
-        public
-        view
-        returns (address owner)
-    {
-        assembly {
-            // load free memory pointer
-            let cdStart := mload(64)
-
-            // bytes4(keccak256(ownerOf(uint256))) = 0x6352211e
-            mstore(cdStart, 0x6352211e00000000000000000000000000000000000000000000000000000000)
-            mstore(add(cdStart, 4), tokenId)
-
-            // staticcall `ownerOf(tokenId)`
-            // `ownerOf` will revert if tokenId is not owned
-            let success := staticcall(
-                gas,      // forward all gas
-                token,    // call token contract
-                cdStart,  // start of calldata
-                36,       // length of input is 36 bytes
-                cdStart,  // write output over input
-                32        // size of output is 32 bytes
-            )
-
-            // Success implies that tokenId is owned
-            // Copy owner from return data if successful
-            if success {
-                owner := mload(cdStart)
-            }    
-        }
-
-        // Owner initialized to address(0), no need to modify if call is unsuccessful
-        return owner;
-    }
-}
diff --git a/contracts/extensions/package.json b/contracts/extensions/package.json
deleted file mode 100644
index 14492af8f..000000000
--- a/contracts/extensions/package.json
+++ /dev/null
@@ -1,93 +0,0 @@
-{
-    "name": "@0x/contracts-extensions",
-    "version": "1.2.3",
-    "engines": {
-        "node": ">=6.12"
-    },
-    "description": "Smart contract extensions of 0x protocol",
-    "main": "lib/src/index.js",
-    "directories": {
-        "test": "test"
-    },
-    "scripts": {
-        "build": "yarn pre_build && tsc -b",
-        "build:ci": "yarn build",
-        "pre_build": "run-s compile generate_contract_wrappers",
-        "test": "yarn run_mocha",
-        "rebuild_and_test": "run-s build test",
-        "test:coverage": "SOLIDITY_COVERAGE=true run-s build run_mocha coverage:report:text coverage:report:lcov",
-        "test:profiler": "SOLIDITY_PROFILER=true run-s build run_mocha profiler:report:html",
-        "test:trace": "SOLIDITY_REVERT_TRACE=true run-s build run_mocha",
-        "run_mocha": "mocha --require source-map-support/register --require make-promises-safe 'lib/test/**/*.js' --timeout 100000 --bail --exit",
-        "compile": "sol-compiler",
-        "watch": "sol-compiler -w",
-        "clean": "shx rm -rf lib generated-artifacts generated-wrappers",
-        "generate_contract_wrappers": "abi-gen --abis  ${npm_package_config_abis} --template ../../node_modules/@0x/abi-gen-templates/contract.handlebars --partials '../../node_modules/@0x/abi-gen-templates/partials/**/*.handlebars' --output generated-wrappers --backend ethers",
-        "lint": "tslint --format stylish --project . --exclude ./generated-wrappers/**/* --exclude ./generated-artifacts/**/* --exclude **/lib/**/* && yarn lint-contracts",
-        "coverage:report:text": "istanbul report text",
-        "coverage:report:html": "istanbul report html && open coverage/index.html",
-        "profiler:report:html": "istanbul report html && open coverage/index.html",
-        "coverage:report:lcov": "istanbul report lcov",
-        "test:circleci": "yarn test",
-        "lint-contracts": "solhint -c ../.solhint.json contracts/**/**/**/**/*.sol"
-    },
-    "config": {
-        "abis": "generated-artifacts/@(BalanceThresholdFilter|DutchAuction|Forwarder|OrderMatcher|OrderValidator).json"
-    },
-    "repository": {
-        "type": "git",
-        "url": "https://github.com/0xProject/0x-monorepo.git"
-    },
-    "license": "Apache-2.0",
-    "bugs": {
-        "url": "https://github.com/0xProject/0x-monorepo/issues"
-    },
-    "homepage": "https://github.com/0xProject/0x-monorepo/contracts/extensions/README.md",
-    "devDependencies": {
-        "@0x/abi-gen": "^1.0.22",
-        "@0x/contract-wrappers": "^5.0.1",
-        "@0x/contracts-test-utils": "^2.0.1",
-        "@0x/dev-utils": "^1.0.24",
-        "@0x/sol-compiler": "^2.0.2",
-        "@0x/subproviders": "^2.1.11",
-        "@0x/tslint-config": "^2.0.2",
-        "@types/bn.js": "^4.11.0",
-        "@types/lodash": "4.14.104",
-        "@types/node": "*",
-        "@types/yargs": "^10.0.0",
-        "chai": "^4.0.1",
-        "chai-as-promised": "^7.1.0",
-        "chai-bignumber": "^3.0.0",
-        "dirty-chai": "^2.0.1",
-        "ethereumjs-abi": "0.6.5",
-        "make-promises-safe": "^1.1.0",
-        "mocha": "^4.1.0",
-        "npm-run-all": "^4.1.2",
-        "shx": "^0.2.2",
-        "solhint": "^1.4.1",
-        "tslint": "5.11.0",
-        "typescript": "3.0.1",
-        "yargs": "^10.0.3"
-    },
-    "dependencies": {
-        "@0x/base-contract": "^3.0.13",
-        "@0x/contracts-interfaces": "^1.0.6",
-        "@0x/contracts-libs": "^1.0.6",
-        "@0x/contracts-protocol": "^2.2.3",
-        "@0x/contracts-tokens": "^1.0.6",
-        "@0x/contracts-utils": "^1.0.6",
-        "@0x/order-utils": "^3.1.2",
-        "@0x/types": "^1.5.2",
-        "@0x/typescript-typings": "^3.0.8",
-        "@0x/utils": "^3.0.1",
-        "@0x/web3-wrapper": "^3.2.4",
-        "@types/js-combinatorics": "^0.5.29",
-        "bn.js": "^4.11.8",
-        "ethereum-types": "^1.1.6",
-        "ethereumjs-util": "^5.1.1",
-        "lodash": "^4.17.5"
-    },
-    "publishConfig": {
-        "access": "public"
-    }
-}
diff --git a/contracts/extensions/src/artifacts/index.ts b/contracts/extensions/src/artifacts/index.ts
deleted file mode 100644
index 329d0f3f3..000000000
--- a/contracts/extensions/src/artifacts/index.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { ContractArtifact } from 'ethereum-types';
-
-import * as BalanceThresholdFilter from '../../generated-artifacts/BalanceThresholdFilter.json';
-import * as DutchAuction from '../../generated-artifacts/DutchAuction.json';
-import * as Forwarder from '../../generated-artifacts/Forwarder.json';
-import * as OrderMatcher from '../../generated-artifacts/OrderMatcher.json';
-import * as OrderValidator from '../../generated-artifacts/OrderValidator.json';
-
-export const artifacts = {
-    BalanceThresholdFilter: BalanceThresholdFilter as ContractArtifact,
-    DutchAuction: DutchAuction as ContractArtifact,
-    Forwarder: Forwarder as ContractArtifact,
-    OrderMatcher: OrderMatcher as ContractArtifact,
-    OrderValidator: OrderValidator as ContractArtifact,
-};
diff --git a/contracts/extensions/src/index.ts b/contracts/extensions/src/index.ts
deleted file mode 100644
index d55f08ea2..000000000
--- a/contracts/extensions/src/index.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-export * from './artifacts';
-export * from './wrappers';
diff --git a/contracts/extensions/src/wrappers/index.ts b/contracts/extensions/src/wrappers/index.ts
deleted file mode 100644
index 65aec3ccd..000000000
--- a/contracts/extensions/src/wrappers/index.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-export * from '../../generated-wrappers/balance_threshold_filter';
-export * from '../../generated-wrappers/dutch_auction';
-export * from '../../generated-wrappers/forwarder';
-export * from '../../generated-wrappers/order_matcher';
-export * from '../../generated-wrappers/order_validator';
diff --git a/contracts/extensions/test/extensions/balance_threshold_filter.ts b/contracts/extensions/test/extensions/balance_threshold_filter.ts
deleted file mode 100644
index adeb7c422..000000000
--- a/contracts/extensions/test/extensions/balance_threshold_filter.ts
+++ /dev/null
@@ -1,1644 +0,0 @@
-import { BlockchainLifecycle } from '@0x/dev-utils';
-import { assetDataUtils } from '@0x/order-utils';
-import { Order, RevertReason, SignedOrder } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import * as chai from 'chai';
-import { TransactionReceiptWithDecodedLogs } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import {
-    artifacts as protocolArtifacts,
-    ERC20Wrapper,
-    ERC721Wrapper,
-    ExchangeContract,
-    ExchangeWrapper,
-} from '@0x/contracts-protocol';
-import {
-    chaiSetup,
-    constants,
-    ContractName,
-    ERC20BalancesByOwner,
-    expectTransactionFailedAsync,
-    OrderFactory,
-    OrderStatus,
-    provider,
-    TransactionFactory,
-    txDefaults,
-    web3Wrapper,
-} from '@0x/contracts-test-utils';
-import { DummyERC20TokenContract } from '@0x/contracts-tokens';
-
-import { BalanceThresholdFilterContract } from '../../generated-wrappers/balance_threshold_filter';
-import { artifacts } from '../../src/artifacts';
-import { BalanceThresholdWrapper } from '../utils/balance_threshold_wrapper';
-
-chaiSetup.configure();
-const expect = chai.expect;
-const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-const DECIMALS_DEFAULT = 18;
-
-interface ValidatedAddressesLog {
-    args: { addresses: string[] };
-}
-
-describe(ContractName.BalanceThresholdFilter, () => {
-    const takerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(500), DECIMALS_DEFAULT);
-    const makerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(1000), DECIMALS_DEFAULT);
-    const takerAssetFillAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(250), DECIMALS_DEFAULT);
-
-    let validMakerAddress: string;
-    let validMakerAddress2: string;
-    let owner: string;
-    let validTakerAddress: string;
-    let feeRecipientAddress: string;
-    let invalidAddress: string;
-    let defaultMakerAssetAddress: string;
-    let defaultTakerAssetAddress: string;
-    let zrxAssetData: string;
-    let zrxToken: DummyERC20TokenContract;
-    let exchangeInstance: ExchangeContract;
-    let exchangeWrapper: ExchangeWrapper;
-
-    let orderFactory: OrderFactory;
-    let orderFactory2: OrderFactory;
-    let invalidOrderFactory: OrderFactory;
-    let erc20Wrapper: ERC20Wrapper;
-    let erc20Balances: ERC20BalancesByOwner;
-    let erc20TakerBalanceThresholdWrapper: BalanceThresholdWrapper;
-    let erc721TakerBalanceThresholdWrapper: BalanceThresholdWrapper;
-    let erc721MakerBalanceThresholdWrapper: BalanceThresholdWrapper;
-    let erc721NonValidBalanceThresholdWrapper: BalanceThresholdWrapper;
-
-    let defaultOrderParams: Partial<Order>;
-    let validSignedOrder: SignedOrder;
-    let validSignedOrder2: SignedOrder;
-
-    let erc721BalanceThresholdFilterInstance: BalanceThresholdFilterContract;
-    let erc20BalanceThresholdFilterInstance: BalanceThresholdFilterContract;
-
-    const assertValidatedAddressesLog = async (
-        txReceipt: TransactionReceiptWithDecodedLogs,
-        expectedValidatedAddresses: string[],
-    ) => {
-        expect(txReceipt.logs.length).to.be.gte(1);
-        const validatedAddressesLog = (txReceipt.logs[0] as any) as ValidatedAddressesLog;
-        const validatedAddresses = validatedAddressesLog.args.addresses;
-        // @HACK-hysz: Nested addresses are not translated to lower-case but this will change once
-        //             the new ABI Encoder/Decoder is used by the contract templates.
-        const validatedAddressesNormalized: string[] = [];
-        _.each(validatedAddresses, address => {
-            const normalizedAddress = _.toLower(address);
-            validatedAddressesNormalized.push(normalizedAddress);
-        });
-        expect(validatedAddressesNormalized).to.be.deep.equal(expectedValidatedAddresses);
-    };
-
-    before(async () => {
-        // Create accounts
-        await blockchainLifecycle.startAsync();
-        const accounts = await web3Wrapper.getAvailableAddressesAsync();
-        const usedAddresses = ([
-            owner,
-            validMakerAddress,
-            validMakerAddress2,
-            validTakerAddress,
-            feeRecipientAddress,
-            invalidAddress,
-        ] = accounts);
-        const takerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(validTakerAddress)];
-        const makerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(validMakerAddress)];
-        const secondMakerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(validMakerAddress2)];
-        const invalidAddressPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(invalidAddress)];
-        // Create wrappers
-        erc20Wrapper = new ERC20Wrapper(provider, usedAddresses, owner);
-        const validAddresses = _.cloneDeepWith(usedAddresses);
-        _.remove(validAddresses, (address: string) => {
-            return address === invalidAddress;
-        });
-        const erc721Wrapper = new ERC721Wrapper(provider, validAddresses, owner);
-        // Deploy ERC20 tokens
-        const numDummyErc20ToDeploy = 4;
-        let erc20TokenA: DummyERC20TokenContract;
-        let erc20TokenB: DummyERC20TokenContract;
-        let erc20BalanceThresholdAsset: DummyERC20TokenContract;
-        [erc20TokenA, erc20TokenB, zrxToken, erc20BalanceThresholdAsset] = await erc20Wrapper.deployDummyTokensAsync(
-            numDummyErc20ToDeploy,
-            constants.DUMMY_TOKEN_DECIMALS,
-        );
-        defaultMakerAssetAddress = erc20TokenA.address;
-        defaultTakerAssetAddress = erc20TokenB.address;
-        zrxAssetData = assetDataUtils.encodeERC20AssetData(zrxToken.address);
-        // Create proxies
-        const erc20Proxy = await erc20Wrapper.deployProxyAsync();
-        await erc20Wrapper.setBalancesAndAllowancesAsync();
-        // Deploy Exchange contract
-        exchangeInstance = await ExchangeContract.deployFrom0xArtifactAsync(
-            protocolArtifacts.Exchange,
-            provider,
-            txDefaults,
-            zrxAssetData,
-        );
-        exchangeWrapper = new ExchangeWrapper(exchangeInstance, provider);
-        // Register proxies
-        await exchangeWrapper.registerAssetProxyAsync(erc20Proxy.address, owner);
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeInstance.address, {
-            from: owner,
-        });
-        // Deploy Balance Threshold Filters
-        // One uses an ERC721 token as its balance threshold asset; the other uses an ERC20
-        const erc721alanceThreshold = new BigNumber(1);
-        await erc721Wrapper.deployProxyAsync();
-        const [erc721BalanceThresholdAsset] = await erc721Wrapper.deployDummyTokensAsync();
-        await erc721Wrapper.setBalancesAndAllowancesAsync();
-        erc721BalanceThresholdFilterInstance = await BalanceThresholdFilterContract.deployFrom0xArtifactAsync(
-            artifacts.BalanceThresholdFilter,
-            provider,
-            txDefaults,
-            exchangeInstance.address,
-            erc721BalanceThresholdAsset.address,
-            erc721alanceThreshold,
-        );
-        const erc20BalanceThreshold = Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 10);
-        erc20BalanceThresholdFilterInstance = await BalanceThresholdFilterContract.deployFrom0xArtifactAsync(
-            artifacts.BalanceThresholdFilter,
-            provider,
-            txDefaults,
-            exchangeInstance.address,
-            erc20BalanceThresholdAsset.address,
-            erc20BalanceThreshold,
-        );
-        // Default order parameters
-        defaultOrderParams = {
-            exchangeAddress: exchangeInstance.address,
-            feeRecipientAddress,
-            makerAssetData: assetDataUtils.encodeERC20AssetData(defaultMakerAssetAddress),
-            takerAssetData: assetDataUtils.encodeERC20AssetData(defaultTakerAssetAddress),
-            makerAssetAmount,
-            takerAssetAmount,
-            makerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), DECIMALS_DEFAULT),
-            takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(150), DECIMALS_DEFAULT),
-            senderAddress: erc721BalanceThresholdFilterInstance.address,
-        };
-        // Create two order factories with valid makers (who meet the threshold balance), and
-        // one factory for an invalid address (that does not meet the threshold balance)
-        // Valid order factory #1
-        const defaultOrderParams1 = {
-            makerAddress: validMakerAddress,
-            ...defaultOrderParams,
-        };
-        orderFactory = new OrderFactory(makerPrivateKey, defaultOrderParams1);
-        // Valid order factory #2
-        const defaultOrderParams2 = {
-            makerAddress: validMakerAddress2,
-            ...defaultOrderParams,
-        };
-        orderFactory2 = new OrderFactory(secondMakerPrivateKey, defaultOrderParams2);
-        // Invalid order factory
-        const defaultNonValidOrderParams = {
-            makerAddress: invalidAddress,
-            ...defaultOrderParams,
-        };
-        invalidOrderFactory = new OrderFactory(invalidAddressPrivateKey, defaultNonValidOrderParams);
-        // Create Balance Thresold Wrappers
-        erc20TakerBalanceThresholdWrapper = new BalanceThresholdWrapper(
-            erc20BalanceThresholdFilterInstance,
-            exchangeInstance,
-            new TransactionFactory(takerPrivateKey, exchangeInstance.address),
-            provider,
-        );
-        erc721TakerBalanceThresholdWrapper = new BalanceThresholdWrapper(
-            erc721BalanceThresholdFilterInstance,
-            exchangeInstance,
-            new TransactionFactory(takerPrivateKey, exchangeInstance.address),
-            provider,
-        );
-        erc721MakerBalanceThresholdWrapper = new BalanceThresholdWrapper(
-            erc721BalanceThresholdFilterInstance,
-            exchangeInstance,
-            new TransactionFactory(makerPrivateKey, exchangeInstance.address),
-            provider,
-        );
-        erc721NonValidBalanceThresholdWrapper = new BalanceThresholdWrapper(
-            erc721BalanceThresholdFilterInstance,
-            exchangeInstance,
-            new TransactionFactory(invalidAddressPrivateKey, exchangeInstance.address),
-            provider,
-        );
-    });
-    beforeEach(async () => {
-        await blockchainLifecycle.startAsync();
-    });
-    afterEach(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-
-    describe('General Sanity Checks', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both maker/taker when both maker and taker exceed the balance threshold of an ERC20 token', async () => {
-            const validSignedOrderERC20Sender = await orderFactory.newSignedOrderAsync({
-                ...defaultOrderParams,
-                makerAddress: validMakerAddress,
-                senderAddress: erc20TakerBalanceThresholdWrapper.getBalanceThresholdAddress(),
-            });
-            // Execute a valid fill
-            const txReceipt = await erc20TakerBalanceThresholdWrapper.fillOrderAsync(
-                validSignedOrderERC20Sender,
-                validTakerAddress,
-                { takerAssetFillAmount },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [validSignedOrder.makerAddress, validTakerAddress];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerAssetFillAmount = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid = validSignedOrder.makerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(makerFeePaid),
-            );
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(makerFeePaid.plus(takerFeePaid)),
-            );
-        });
-        it('should revert if the Exchange transaction function is not supported', async () => {
-            // Create signed order without the fillOrder function selector
-            const salt = new BigNumber(0);
-            const badSelectorHex = '0x00000000';
-            const signatureHex = '0x';
-            // Call valid forwarder
-            return expectTransactionFailedAsync(
-                erc721BalanceThresholdFilterInstance.executeTransaction.sendTransactionAsync(
-                    salt,
-                    validTakerAddress,
-                    badSelectorHex,
-                    signatureHex,
-                ),
-                RevertReason.InvalidOrBlockedExchangeSelector,
-            );
-        });
-        it('should revert if senderAddress is not set to the valid forwarding contract', async () => {
-            // Create signed order with incorrect senderAddress
-            const notBalanceThresholdFilterAddress = zrxToken.address;
-            const signedOrderWithBadSenderAddress = await orderFactory.newSignedOrderAsync({
-                senderAddress: notBalanceThresholdFilterAddress,
-            });
-            // Call valid forwarder
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.fillOrderAsync(signedOrderWithBadSenderAddress, validTakerAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.FailedExecution,
-            );
-        });
-    });
-
-    describe('batchFillOrders', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both makers/taker when both maker and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const orders = [validSignedOrder, validSignedOrder2];
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.batchFillOrdersAsync(orders, validTakerAddress, {
-                takerAssetFillAmounts,
-            });
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                validSignedOrder.makerAddress,
-                validSignedOrder2.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const cumulativeTakerAssetFillAmount = takerAssetFillAmount.times(2);
-            const makerAssetFillAmount = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid = validSignedOrder.makerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount)
-                .times(2);
-            // Maker #1
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(makerFeePaid),
-            );
-            // Maker #2
-            expect(newBalances[validMakerAddress2][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][zrxToken.address].minus(makerFeePaid),
-            );
-            // Taker
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(cumulativeTakerAssetFillAmount),
-            );
-
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount.times(2)),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            // Fee recipient
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(makerFeePaid.times(2).plus(takerFeePaid)),
-            );
-        });
-        it('should revert if one maker does not meet the balance threshold', async () => {
-            // Create order set with one non-valid maker address
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                makerAddress: invalidAddress,
-            });
-            const orders = [validSignedOrder, signedOrderWithBadMakerAddress];
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.batchFillOrdersAsync(orders, validTakerAddress, {
-                    takerAssetFillAmounts,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            const orders = [validSignedOrder, validSignedOrder2];
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.batchFillOrdersAsync(orders, invalidAddress, {
-                    takerAssetFillAmounts,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('batchFillOrdersNoThrow', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both makers/taker when both maker and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const orders = [validSignedOrder, validSignedOrder2];
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.batchFillOrdersNoThrowAsync(
-                orders,
-                validTakerAddress,
-                {
-                    takerAssetFillAmounts,
-                    // HACK(albrow): We need to hardcode the gas estimate here because
-                    // the Geth gas estimator doesn't work with the way we use
-                    // delegatecall and swallow errors.
-                    gas: 600000,
-                },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                validSignedOrder.makerAddress,
-                validSignedOrder2.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const cumulativeTakerAssetFillAmount = takerAssetFillAmount.times(2);
-            const makerAssetFillAmount = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid = validSignedOrder.makerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount)
-                .times(2);
-            // Maker #1
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(makerFeePaid),
-            );
-            // Maker #2
-            expect(newBalances[validMakerAddress2][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][zrxToken.address].minus(makerFeePaid),
-            );
-            // Taker
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(cumulativeTakerAssetFillAmount),
-            );
-
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount.times(2)),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            // Fee recipient
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(makerFeePaid.times(2).plus(takerFeePaid)),
-            );
-        });
-        it('should revert if one maker does not meet the balance threshold', async () => {
-            // Create order set with one non-valid maker address
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                makerAddress: invalidAddress,
-            });
-            const orders = [validSignedOrder, signedOrderWithBadMakerAddress];
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.batchFillOrdersNoThrowAsync(orders, validTakerAddress, {
-                    takerAssetFillAmounts,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            const orders = [validSignedOrder, validSignedOrder2];
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.batchFillOrdersNoThrowAsync(orders, invalidAddress, {
-                    takerAssetFillAmounts,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('batchFillOrKillOrders', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both makers/taker when both makers and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const orders = [validSignedOrder, validSignedOrder2];
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.batchFillOrKillOrdersAsync(
-                orders,
-                validTakerAddress,
-                { takerAssetFillAmounts },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                validSignedOrder.makerAddress,
-                validSignedOrder2.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const cumulativeTakerAssetFillAmount = takerAssetFillAmount.times(2);
-            const makerAssetFillAmount = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid = validSignedOrder.makerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount)
-                .times(2);
-            // Maker #1
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(makerFeePaid),
-            );
-            // Maker #2
-            expect(newBalances[validMakerAddress2][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][zrxToken.address].minus(makerFeePaid),
-            );
-            // Taker
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(cumulativeTakerAssetFillAmount),
-            );
-
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount.times(2)),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            // Fee recipient
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(makerFeePaid.times(2).plus(takerFeePaid)),
-            );
-        });
-        it('should revert if one maker does not meet the balance threshold', async () => {
-            // Create order set with one non-valid maker address
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                makerAddress: invalidAddress,
-            });
-            const orders = [validSignedOrder, signedOrderWithBadMakerAddress];
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.batchFillOrKillOrdersAsync(orders, validTakerAddress, {
-                    takerAssetFillAmounts,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            const orders = [validSignedOrder, validSignedOrder2];
-            const takerAssetFillAmounts = [takerAssetFillAmount, takerAssetFillAmount];
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.batchFillOrKillOrdersAsync(orders, invalidAddress, {
-                    takerAssetFillAmounts,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if one takerAssetFillAmount is not fully filled', async () => {
-            const tooBigTakerAssetFillAmount = validSignedOrder.takerAssetAmount.times(2);
-            const orders = [validSignedOrder, validSignedOrder2];
-            const takerAssetFillAmounts = [takerAssetFillAmount, tooBigTakerAssetFillAmount];
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.batchFillOrKillOrdersAsync(orders, validTakerAddress, {
-                    takerAssetFillAmounts,
-                }),
-                RevertReason.FailedExecution,
-            );
-        });
-    });
-
-    describe('fillOrder', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both maker/taker when both maker and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.fillOrderAsync(
-                validSignedOrder,
-                validTakerAddress,
-                { takerAssetFillAmount },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [validSignedOrder.makerAddress, validTakerAddress];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerAssetFillAmount = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid = validSignedOrder.makerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(makerFeePaid),
-            );
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(makerFeePaid.plus(takerFeePaid)),
-            );
-        });
-        it('should revert if maker does not meet the balance threshold', async () => {
-            // Create signed order with non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                senderAddress: erc721BalanceThresholdFilterInstance.address,
-                makerAddress: invalidAddress,
-            });
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.fillOrderAsync(signedOrderWithBadMakerAddress, validTakerAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.fillOrderAsync(validSignedOrder, invalidAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('fillOrderNoThrow', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both maker/taker when both maker and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.fillOrderNoThrowAsync(
-                validSignedOrder,
-                validTakerAddress,
-                {
-                    takerAssetFillAmount,
-                    // HACK(albrow): We need to hardcode the gas estimate here because
-                    // the Geth gas estimator doesn't work with the way we use
-                    // delegatecall and swallow errors.
-                    gas: 600000,
-                },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [validSignedOrder.makerAddress, validTakerAddress];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerAssetFillAmount = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid = validSignedOrder.makerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(makerFeePaid),
-            );
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(makerFeePaid.plus(takerFeePaid)),
-            );
-        });
-        it('should revert if maker does not meet the balance threshold', async () => {
-            // Create signed order with non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                senderAddress: erc721BalanceThresholdFilterInstance.address,
-                makerAddress: invalidAddress,
-            });
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.fillOrderNoThrowAsync(
-                    signedOrderWithBadMakerAddress,
-                    validTakerAddress,
-                    { takerAssetFillAmount },
-                ),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.fillOrderNoThrowAsync(validSignedOrder, invalidAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('fillOrKillOrder', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both maker/taker when both maker and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const takerAssetFillAmount_ = validSignedOrder.takerAssetAmount;
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.fillOrKillOrderAsync(
-                validSignedOrder,
-                validTakerAddress,
-                { takerAssetFillAmount: takerAssetFillAmount_ },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [validSignedOrder.makerAddress, validTakerAddress];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerAssetFillAmount = takerAssetFillAmount_
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid = validSignedOrder.makerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee
-                .times(makerAssetFillAmount)
-                .dividedToIntegerBy(validSignedOrder.makerAssetAmount);
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(takerAssetFillAmount_),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(makerFeePaid),
-            );
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(takerAssetFillAmount_),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(makerFeePaid.plus(takerFeePaid)),
-            );
-        });
-        it('should revert if maker does not meet the balance threshold', async () => {
-            // Create signed order with non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                senderAddress: erc721BalanceThresholdFilterInstance.address,
-                makerAddress: invalidAddress,
-            });
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.fillOrKillOrderAsync(
-                    signedOrderWithBadMakerAddress,
-                    validTakerAddress,
-                    { takerAssetFillAmount },
-                ),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.fillOrKillOrderAsync(validSignedOrder, invalidAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if takerAssetFillAmount is not fully filled', async () => {
-            const tooBigTakerAssetFillAmount = validSignedOrder.takerAssetAmount.times(2);
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.fillOrKillOrderAsync(validSignedOrder, validTakerAddress, {
-                    takerAssetFillAmount: tooBigTakerAssetFillAmount,
-                }),
-                RevertReason.FailedExecution,
-            );
-        });
-    });
-
-    describe('marketSellOrders', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both makers/taker when both makers and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const orders = [validSignedOrder, validSignedOrder2];
-            const cumulativeTakerAssetFillAmount = validSignedOrder.takerAssetAmount.plus(takerAssetFillAmount);
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.marketSellOrdersAsync(
-                orders,
-                validTakerAddress,
-                { takerAssetFillAmount: cumulativeTakerAssetFillAmount },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                validSignedOrder.makerAddress,
-                validSignedOrder2.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerAssetFillAmount2 = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid2 = validSignedOrder2.makerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid2 = validSignedOrder2.takerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee.plus(takerFeePaid2);
-            const cumulativeMakerAssetFillAmount = validSignedOrder.makerAssetAmount.plus(makerAssetFillAmount2);
-            // Maker #1
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(validSignedOrder.makerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(validSignedOrder.takerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(validSignedOrder.makerFee),
-            );
-            // Maker #2
-            expect(newBalances[validMakerAddress2][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultMakerAssetAddress].minus(makerAssetFillAmount2),
-            );
-            expect(newBalances[validMakerAddress2][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][zrxToken.address].minus(makerFeePaid2),
-            );
-            // Taker
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(cumulativeTakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(cumulativeMakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            // Fee recipient
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address]
-                    .plus(validSignedOrder.makerFee)
-                    .plus(makerFeePaid2)
-                    .plus(takerFeePaid),
-            );
-        });
-        it('should revert if one maker does not meet the balance threshold', async () => {
-            // Create order set with one non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                makerAddress: invalidAddress,
-            });
-            const orders = [validSignedOrder, signedOrderWithBadMakerAddress];
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.marketSellOrdersAsync(orders, validTakerAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            const orders = [validSignedOrder, validSignedOrder2];
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.marketSellOrdersAsync(orders, invalidAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('marketSellOrdersNoThrow', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both makers/taker when both makers and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const orders = [validSignedOrder, validSignedOrder2];
-            const cumulativeTakerAssetFillAmount = validSignedOrder.takerAssetAmount.plus(takerAssetFillAmount);
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.marketSellOrdersNoThrowAsync(
-                orders,
-                validTakerAddress,
-                {
-                    takerAssetFillAmount: cumulativeTakerAssetFillAmount,
-                    // HACK(albrow): We need to hardcode the gas estimate here because
-                    // the Geth gas estimator doesn't work with the way we use
-                    // delegatecall and swallow errors.
-                    gas: 600000,
-                },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                validSignedOrder.makerAddress,
-                validSignedOrder2.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerAssetFillAmount2 = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const makerFeePaid2 = validSignedOrder2.makerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid2 = validSignedOrder2.takerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee.plus(takerFeePaid2);
-            const cumulativeMakerAssetFillAmount = validSignedOrder.makerAssetAmount.plus(makerAssetFillAmount2);
-            // Maker #1
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(validSignedOrder.makerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(validSignedOrder.takerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(validSignedOrder.makerFee),
-            );
-            // Maker #2
-            expect(newBalances[validMakerAddress2][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultMakerAssetAddress].minus(makerAssetFillAmount2),
-            );
-            expect(newBalances[validMakerAddress2][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][zrxToken.address].minus(makerFeePaid2),
-            );
-            // Taker
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(cumulativeTakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(cumulativeMakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            // Fee recipient
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address]
-                    .plus(validSignedOrder.makerFee)
-                    .plus(makerFeePaid2)
-                    .plus(takerFeePaid),
-            );
-        });
-        it('should revert if one maker does not meet the balance threshold', async () => {
-            // Create order set with one non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                makerAddress: invalidAddress,
-            });
-            const orders = [validSignedOrder, signedOrderWithBadMakerAddress];
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.marketSellOrdersNoThrowAsync(orders, validTakerAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            const orders = [validSignedOrder, validSignedOrder2];
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.marketSellOrdersNoThrowAsync(orders, invalidAddress, {
-                    takerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('marketBuyOrders', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both makers/taker when both makers and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const orders = [validSignedOrder, validSignedOrder2];
-            const cumulativeTakerAssetFillAmount = validSignedOrder.takerAssetAmount.plus(takerAssetFillAmount);
-            const makerAssetFillAmount2 = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const cumulativeMakerAssetFillAmount = validSignedOrder.makerAssetAmount.plus(makerAssetFillAmount2);
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.marketBuyOrdersAsync(orders, validTakerAddress, {
-                makerAssetFillAmount: cumulativeMakerAssetFillAmount,
-            });
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                validSignedOrder.makerAddress,
-                validSignedOrder2.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerFeePaid2 = validSignedOrder2.makerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid2 = validSignedOrder2.takerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee.plus(takerFeePaid2);
-            // Maker #1
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(validSignedOrder.makerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(validSignedOrder.takerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(validSignedOrder.makerFee),
-            );
-            // Maker #2
-            expect(newBalances[validMakerAddress2][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultMakerAssetAddress].minus(makerAssetFillAmount2),
-            );
-            expect(newBalances[validMakerAddress2][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][zrxToken.address].minus(makerFeePaid2),
-            );
-            // Taker
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(cumulativeTakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(cumulativeMakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            // Fee recipient
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address]
-                    .plus(validSignedOrder.makerFee)
-                    .plus(makerFeePaid2)
-                    .plus(takerFeePaid),
-            );
-        });
-        it('should revert if one maker does not meet the balance threshold', async () => {
-            // Create order set with one non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                makerAddress: invalidAddress,
-            });
-            const orders = [validSignedOrder, signedOrderWithBadMakerAddress];
-            // Execute transaction
-            const dummyMakerAssetFillAmount = new BigNumber(0);
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.marketBuyOrdersAsync(orders, validTakerAddress, {
-                    makerAssetFillAmount: dummyMakerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            const orders = [validSignedOrder, validSignedOrder2];
-            const dummyMakerAssetFillAmount = new BigNumber(0);
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.marketBuyOrdersAsync(orders, invalidAddress, {
-                    makerAssetFillAmount: dummyMakerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('marketBuyOrdersNoThrowAsync', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('should transfer the correct amounts and validate both makers/taker when both makers and taker meet the balance threshold', async () => {
-            // Execute a valid fill
-            const orders = [validSignedOrder, validSignedOrder2];
-            const cumulativeTakerAssetFillAmount = validSignedOrder.takerAssetAmount.plus(takerAssetFillAmount);
-            const makerAssetFillAmount2 = takerAssetFillAmount
-                .times(validSignedOrder.makerAssetAmount)
-                .dividedToIntegerBy(validSignedOrder.takerAssetAmount);
-            const cumulativeMakerAssetFillAmount = validSignedOrder.makerAssetAmount.plus(makerAssetFillAmount2);
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.marketBuyOrdersNoThrowAsync(
-                orders,
-                validTakerAddress,
-                {
-                    makerAssetFillAmount: cumulativeMakerAssetFillAmount,
-                    // HACK(albrow): We need to hardcode the gas estimate here because
-                    // the Geth gas estimator doesn't work with the way we use
-                    // delegatecall and swallow errors.
-                    gas: 600000,
-                },
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                validSignedOrder.makerAddress,
-                validSignedOrder2.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const makerFeePaid2 = validSignedOrder2.makerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid2 = validSignedOrder2.takerFee
-                .times(makerAssetFillAmount2)
-                .dividedToIntegerBy(validSignedOrder2.makerAssetAmount);
-            const takerFeePaid = validSignedOrder.takerFee.plus(takerFeePaid2);
-            // Maker #1
-            expect(newBalances[validMakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultMakerAssetAddress].minus(validSignedOrder.makerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][defaultTakerAssetAddress].plus(validSignedOrder.takerAssetAmount),
-            );
-            expect(newBalances[validMakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress][zrxToken.address].minus(validSignedOrder.makerFee),
-            );
-            // Maker #2
-            expect(newBalances[validMakerAddress2][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultMakerAssetAddress].minus(makerAssetFillAmount2),
-            );
-            expect(newBalances[validMakerAddress2][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][defaultTakerAssetAddress].plus(takerAssetFillAmount),
-            );
-            expect(newBalances[validMakerAddress2][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validMakerAddress2][zrxToken.address].minus(makerFeePaid2),
-            );
-            // Taker
-            expect(newBalances[validTakerAddress][defaultTakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultTakerAssetAddress].minus(cumulativeTakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(cumulativeMakerAssetFillAmount),
-            );
-            expect(newBalances[validTakerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address].minus(takerFeePaid),
-            );
-            // Fee recipient
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address]
-                    .plus(validSignedOrder.makerFee)
-                    .plus(makerFeePaid2)
-                    .plus(takerFeePaid),
-            );
-        });
-        it('should revert if one maker does not meet the balance threshold', async () => {
-            // Create order set with one non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                makerAddress: invalidAddress,
-            });
-            const orders = [validSignedOrder, signedOrderWithBadMakerAddress];
-            // Execute transaction
-            const dummyMakerAssetFillAmount = new BigNumber(0);
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.marketBuyOrdersNoThrowAsync(orders, validTakerAddress, {
-                    makerAssetFillAmount: dummyMakerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            const orders = [validSignedOrder, validSignedOrder2];
-            const dummyMakerAssetFillAmount = new BigNumber(0);
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.marketBuyOrdersNoThrowAsync(orders, invalidAddress, {
-                    makerAssetFillAmount: dummyMakerAssetFillAmount,
-                }),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('matchOrders', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('Should transfer correct amounts when both makers and taker meet the balance threshold', async () => {
-            // Test values/results taken from Match Orders test:
-            // 'Should transfer correct amounts when right order is fully filled and values pass isRoundingErrorFloor but fail isRoundingErrorCeil'
-            // Create orders to match
-            const signedOrderLeft = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(17), 0),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(98), 0),
-                makerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
-                takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
-                feeRecipientAddress,
-            });
-            const signedOrderRight = await orderFactory2.newSignedOrderAsync({
-                makerAssetData: assetDataUtils.encodeERC20AssetData(defaultTakerAssetAddress),
-                takerAssetData: assetDataUtils.encodeERC20AssetData(defaultMakerAssetAddress),
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(75), 0),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(13), 0),
-                makerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
-                takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
-                feeRecipientAddress,
-            });
-            // Compute expected transfer amounts
-            const expectedTransferAmounts = {
-                // Left Maker
-                amountSoldByLeftMaker: Web3Wrapper.toBaseUnitAmount(new BigNumber(13), 0),
-                amountBoughtByLeftMaker: Web3Wrapper.toBaseUnitAmount(new BigNumber(75), 0),
-                feePaidByLeftMaker: Web3Wrapper.toBaseUnitAmount(new BigNumber('76.4705882352941176'), 16), // 76.47%
-                // Right Maker
-                amountSoldByRightMaker: Web3Wrapper.toBaseUnitAmount(new BigNumber(75), 0),
-                amountBoughtByRightMaker: Web3Wrapper.toBaseUnitAmount(new BigNumber(13), 0),
-                feePaidByRightMaker: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 16), // 100%
-                // Taker
-                amountReceivedByTaker: Web3Wrapper.toBaseUnitAmount(new BigNumber(0), 0),
-                feePaidByTakerLeft: Web3Wrapper.toBaseUnitAmount(new BigNumber('76.5306122448979591'), 16), // 76.53%
-                feePaidByTakerRight: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 16), // 100%
-            };
-            const txReceipt = await erc721TakerBalanceThresholdWrapper.matchOrdersAsync(
-                signedOrderLeft,
-                signedOrderRight,
-                validTakerAddress,
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses = [
-                signedOrderLeft.makerAddress,
-                signedOrderRight.makerAddress,
-                validTakerAddress,
-            ];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check balances
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            expect(
-                newBalances[signedOrderLeft.makerAddress][defaultMakerAssetAddress],
-                'Checking left maker egress ERC20 account balance',
-            ).to.be.bignumber.equal(
-                erc20Balances[signedOrderLeft.makerAddress][defaultMakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByLeftMaker,
-                ),
-            );
-            expect(
-                newBalances[signedOrderRight.makerAddress][defaultTakerAssetAddress],
-                'Checking right maker ingress ERC20 account balance',
-            ).to.be.bignumber.equal(
-                erc20Balances[signedOrderRight.makerAddress][defaultTakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByRightMaker,
-                ),
-            );
-            expect(
-                newBalances[validTakerAddress][defaultMakerAssetAddress],
-                'Checking taker ingress ERC20 account balance',
-            ).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][defaultMakerAssetAddress].plus(
-                    expectedTransferAmounts.amountReceivedByTaker,
-                ),
-            );
-            expect(
-                newBalances[signedOrderLeft.makerAddress][defaultTakerAssetAddress],
-                'Checking left maker ingress ERC20 account balance',
-            ).to.be.bignumber.equal(
-                erc20Balances[signedOrderLeft.makerAddress][defaultTakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByLeftMaker,
-                ),
-            );
-            expect(
-                newBalances[signedOrderRight.makerAddress][defaultMakerAssetAddress],
-                'Checking right maker egress ERC20 account balance',
-            ).to.be.bignumber.equal(
-                erc20Balances[signedOrderRight.makerAddress][defaultMakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByRightMaker,
-                ),
-            );
-            // Paid fees
-            expect(
-                newBalances[signedOrderLeft.makerAddress][zrxToken.address],
-                'Checking left maker egress ERC20 account fees',
-            ).to.be.bignumber.equal(
-                erc20Balances[signedOrderLeft.makerAddress][zrxToken.address].minus(
-                    expectedTransferAmounts.feePaidByLeftMaker,
-                ),
-            );
-            expect(
-                newBalances[signedOrderRight.makerAddress][zrxToken.address],
-                'Checking right maker egress ERC20 account fees',
-            ).to.be.bignumber.equal(
-                erc20Balances[signedOrderRight.makerAddress][zrxToken.address].minus(
-                    expectedTransferAmounts.feePaidByRightMaker,
-                ),
-            );
-            expect(
-                newBalances[validTakerAddress][zrxToken.address],
-                'Checking taker egress ERC20 account fees',
-            ).to.be.bignumber.equal(
-                erc20Balances[validTakerAddress][zrxToken.address]
-                    .minus(expectedTransferAmounts.feePaidByTakerLeft)
-                    .minus(expectedTransferAmounts.feePaidByTakerRight),
-            );
-            // Received fees
-            expect(
-                newBalances[signedOrderLeft.feeRecipientAddress][zrxToken.address],
-                'Checking left fee recipient ingress ERC20 account fees',
-            ).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address]
-                    .plus(expectedTransferAmounts.feePaidByLeftMaker)
-                    .plus(expectedTransferAmounts.feePaidByRightMaker)
-                    .plus(expectedTransferAmounts.feePaidByTakerLeft)
-                    .plus(expectedTransferAmounts.feePaidByTakerRight),
-            );
-        });
-        it('should revert if left maker does not meet the balance threshold', async () => {
-            // Create signed order with non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                senderAddress: erc721BalanceThresholdFilterInstance.address,
-                makerAddress: invalidAddress,
-            });
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.matchOrdersAsync(
-                    validSignedOrder,
-                    signedOrderWithBadMakerAddress,
-                    validTakerAddress,
-                ),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if right maker does not meet the balance threshold', async () => {
-            // Create signed order with non-valid maker address
-            const signedOrderWithBadMakerAddress = await orderFactory.newSignedOrderAsync({
-                senderAddress: erc721BalanceThresholdFilterInstance.address,
-                makerAddress: invalidAddress,
-            });
-            // Execute transaction
-            return expectTransactionFailedAsync(
-                erc721TakerBalanceThresholdWrapper.matchOrdersAsync(
-                    signedOrderWithBadMakerAddress,
-                    validSignedOrder,
-                    validTakerAddress,
-                ),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-        it('should revert if taker does not meet the balance threshold', async () => {
-            return expectTransactionFailedAsync(
-                erc721NonValidBalanceThresholdWrapper.matchOrdersAsync(
-                    validSignedOrder,
-                    validSignedOrder,
-                    invalidAddress,
-                ),
-                RevertReason.AtLeastOneAddressDoesNotMeetBalanceThreshold,
-            );
-        });
-    });
-
-    describe('cancelOrder', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-            validSignedOrder = await orderFactory.newSignedOrderAsync();
-            validSignedOrder2 = await orderFactory2.newSignedOrderAsync();
-        });
-        it('Should successfully cancel order if maker meets balance threshold', async () => {
-            // Verify order is not cancelled
-            const orderInfoBeforeCancelling = await erc721MakerBalanceThresholdWrapper.getOrderInfoAsync(
-                validSignedOrder,
-            );
-            expect(orderInfoBeforeCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-            // Cancel
-            const txReceipt = await erc721MakerBalanceThresholdWrapper.cancelOrderAsync(
-                validSignedOrder,
-                validSignedOrder.makerAddress,
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses: string[] = [];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check that order was cancelled
-            const orderInfoAfterCancelling = await erc721MakerBalanceThresholdWrapper.getOrderInfoAsync(
-                validSignedOrder,
-            );
-            expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Cancelled);
-        });
-        it('Should successfully cancel order if maker does not meet balance threshold', async () => {
-            // Create order where maker does not meet balance threshold
-            const signedOrderWithBadMakerAddress = await invalidOrderFactory.newSignedOrderAsync({});
-            // Verify order is not cancelled
-            const orderInfoBeforeCancelling = await erc721NonValidBalanceThresholdWrapper.getOrderInfoAsync(
-                signedOrderWithBadMakerAddress,
-            );
-            expect(orderInfoBeforeCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-            // Cancel
-            const txReceipt = await erc721NonValidBalanceThresholdWrapper.cancelOrderAsync(
-                signedOrderWithBadMakerAddress,
-                signedOrderWithBadMakerAddress.makerAddress,
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses: string[] = [];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check that order was cancelled
-            const orderInfoAfterCancelling = await erc721MakerBalanceThresholdWrapper.getOrderInfoAsync(
-                signedOrderWithBadMakerAddress,
-            );
-            expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Cancelled);
-        });
-    });
-
-    describe('batchCancelOrders', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-        });
-        it('Should successfully batch cancel orders if maker meets balance threshold', async () => {
-            // Create orders to cancel
-            const validSignedOrders = [
-                await orderFactory.newSignedOrderAsync(),
-                await orderFactory.newSignedOrderAsync(),
-                await orderFactory.newSignedOrderAsync(),
-            ];
-            // Verify orders are not cancelled
-            _.each(validSignedOrders, async signedOrder => {
-                const orderInfoBeforeCancelling = await erc721MakerBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                return expect(orderInfoBeforeCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-            });
-            // Cancel
-            const txReceipt = await erc721MakerBalanceThresholdWrapper.batchCancelOrdersAsync(
-                validSignedOrders,
-                validSignedOrders[0].makerAddress,
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses: string[] = [];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check that order was cancelled
-            _.each(validSignedOrders, async signedOrder => {
-                const orderInfoAfterCancelling = await erc721MakerBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                return expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Cancelled);
-            });
-        });
-        it('Should successfully batch cancel order if maker does not meet balance threshold', async () => {
-            // Create orders to cancel
-            const invalidSignedOrders = [
-                await invalidOrderFactory.newSignedOrderAsync(),
-                await invalidOrderFactory.newSignedOrderAsync(),
-                await invalidOrderFactory.newSignedOrderAsync(),
-            ];
-            // Verify orders are not cancelled
-            _.each(invalidSignedOrders, async signedOrder => {
-                const orderInfoBeforeCancelling = await erc721NonValidBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                return expect(orderInfoBeforeCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-            });
-            // Cancel
-            const txReceipt = await erc721NonValidBalanceThresholdWrapper.batchCancelOrdersAsync(
-                invalidSignedOrders,
-                invalidAddress,
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses: string[] = [];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check that order was cancelled
-            _.each(invalidSignedOrders, async signedOrder => {
-                const orderInfoAfterCancelling = await erc721NonValidBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                return expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Cancelled);
-            });
-        });
-    });
-
-    describe('cancelOrdersUpTo', () => {
-        beforeEach(async () => {
-            erc20Balances = await erc20Wrapper.getBalancesAsync();
-        });
-        it('Should successfully batch cancel orders if maker meets balance threshold', async () => {
-            // Create orders to cancel
-            const validSignedOrders = [
-                await orderFactory.newSignedOrderAsync({ salt: new BigNumber(0) }),
-                await orderFactory.newSignedOrderAsync({ salt: new BigNumber(1) }),
-                await orderFactory.newSignedOrderAsync({ salt: new BigNumber(2) }),
-            ];
-            // Verify orders are not cancelled
-            _.each(validSignedOrders, async signedOrder => {
-                const orderInfoBeforeCancelling = await erc721MakerBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                return expect(orderInfoBeforeCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-            });
-            // Cancel
-            const cancelOrdersUpToThisSalt = new BigNumber(1);
-            const txReceipt = await erc721MakerBalanceThresholdWrapper.cancelOrdersUpToAsync(
-                cancelOrdersUpToThisSalt,
-                validSignedOrders[0].makerAddress,
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses: string[] = [];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check that order was cancelled
-            _.each(validSignedOrders, async (signedOrder, salt: number) => {
-                const orderInfoAfterCancelling = await erc721MakerBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                const saltAsBigNumber = new BigNumber(salt);
-                if (saltAsBigNumber.isLessThanOrEqualTo(cancelOrdersUpToThisSalt)) {
-                    return expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Cancelled);
-                } else {
-                    return expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-                }
-            });
-        });
-        it('Should successfully batch cancel order if maker does not meet balance threshold', async () => {
-            // Create orders to cancel
-            const invalidSignedOrders = [
-                await invalidOrderFactory.newSignedOrderAsync({ salt: new BigNumber(0) }),
-                await invalidOrderFactory.newSignedOrderAsync({ salt: new BigNumber(1) }),
-                await invalidOrderFactory.newSignedOrderAsync({ salt: new BigNumber(2) }),
-            ];
-            // Verify orders are not cancelled
-            _.each(invalidSignedOrders, async signedOrder => {
-                const orderInfoBeforeCancelling = await erc721NonValidBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                return expect(orderInfoBeforeCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-            });
-            // Cancel
-            const cancelOrdersUpToThisSalt = new BigNumber(1);
-            const txReceipt = await erc721NonValidBalanceThresholdWrapper.cancelOrdersUpToAsync(
-                cancelOrdersUpToThisSalt,
-                invalidAddress,
-            );
-            // Assert validated addresses
-            const expectedValidatedAddresseses: string[] = [];
-            await assertValidatedAddressesLog(txReceipt, expectedValidatedAddresseses);
-            // Check that order was cancelled
-            _.each(invalidSignedOrders, async (signedOrder, salt: number) => {
-                const orderInfoAfterCancelling = await erc721NonValidBalanceThresholdWrapper.getOrderInfoAsync(
-                    signedOrder,
-                );
-                const saltAsBigNumber = new BigNumber(salt);
-                if (saltAsBigNumber.isLessThanOrEqualTo(cancelOrdersUpToThisSalt)) {
-                    return expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Cancelled);
-                } else {
-                    return expect(orderInfoAfterCancelling.orderStatus).to.be.equal(OrderStatus.Fillable);
-                }
-            });
-        });
-    });
-});
-// tslint:disable:max-file-line-count
-// tslint:enable:no-unnecessary-type-assertion
diff --git a/contracts/extensions/test/extensions/dutch_auction.ts b/contracts/extensions/test/extensions/dutch_auction.ts
deleted file mode 100644
index 22b3caa16..000000000
--- a/contracts/extensions/test/extensions/dutch_auction.ts
+++ /dev/null
@@ -1,378 +0,0 @@
-import { DutchAuctionWrapper } from '@0x/contract-wrappers';
-import {
-    artifacts as protocolArtifacts,
-    ERC20Wrapper,
-    ERC721Wrapper,
-    ExchangeContract,
-    ExchangeWrapper,
-} from '@0x/contracts-protocol';
-import {
-    chaiSetup,
-    constants,
-    ContractName,
-    ERC20BalancesByOwner,
-    expectTransactionFailedAsync,
-    getLatestBlockTimestampAsync,
-    OrderFactory,
-    provider,
-    txDefaults,
-    web3Wrapper,
-} from '@0x/contracts-test-utils';
-import {
-    artifacts as tokensArtifacts,
-    DummyERC20TokenContract,
-    DummyERC721TokenContract,
-    WETH9Contract,
-} from '@0x/contracts-tokens';
-import { BlockchainLifecycle } from '@0x/dev-utils';
-import { assetDataUtils, generatePseudoRandomSalt } from '@0x/order-utils';
-import { RevertReason, SignedOrder } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import * as chai from 'chai';
-import * as _ from 'lodash';
-
-import { DutchAuctionContract } from '../../generated-wrappers/dutch_auction';
-import { artifacts } from '../../src/artifacts';
-import { DutchAuctionTestWrapper } from '../utils/dutch_auction_test_wrapper';
-
-chaiSetup.configure();
-const expect = chai.expect;
-const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-const DECIMALS_DEFAULT = 18;
-
-describe(ContractName.DutchAuction, () => {
-    let makerAddress: string;
-    let owner: string;
-    let takerAddress: string;
-    let feeRecipientAddress: string;
-    let defaultMakerAssetAddress: string;
-
-    let zrxToken: DummyERC20TokenContract;
-    let erc20TokenA: DummyERC20TokenContract;
-    let erc721Token: DummyERC721TokenContract;
-    let dutchAuctionContract: DutchAuctionContract;
-    let wethContract: WETH9Contract;
-
-    let sellerOrderFactory: OrderFactory;
-    let buyerOrderFactory: OrderFactory;
-    let erc20Wrapper: ERC20Wrapper;
-    let erc20Balances: ERC20BalancesByOwner;
-    let currentBlockTimestamp: number;
-    let auctionBeginTimeSeconds: BigNumber;
-    let auctionEndTimeSeconds: BigNumber;
-    let auctionBeginAmount: BigNumber;
-    let auctionEndAmount: BigNumber;
-    let sellOrder: SignedOrder;
-    let buyOrder: SignedOrder;
-    let erc721MakerAssetIds: BigNumber[];
-    const tenMinutesInSeconds = 10 * 60;
-
-    let dutchAuctionTestWrapper: DutchAuctionTestWrapper;
-    let defaultERC20MakerAssetData: string;
-
-    before(async () => {
-        await blockchainLifecycle.startAsync();
-        const accounts = await web3Wrapper.getAvailableAddressesAsync();
-        const usedAddresses = ([owner, makerAddress, takerAddress, feeRecipientAddress] = accounts);
-
-        erc20Wrapper = new ERC20Wrapper(provider, usedAddresses, owner);
-
-        const numDummyErc20ToDeploy = 2;
-        [erc20TokenA, zrxToken] = await erc20Wrapper.deployDummyTokensAsync(
-            numDummyErc20ToDeploy,
-            constants.DUMMY_TOKEN_DECIMALS,
-        );
-        const erc20Proxy = await erc20Wrapper.deployProxyAsync();
-        await erc20Wrapper.setBalancesAndAllowancesAsync();
-
-        const erc721Wrapper = new ERC721Wrapper(provider, usedAddresses, owner);
-        [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
-        const erc721Proxy = await erc721Wrapper.deployProxyAsync();
-        await erc721Wrapper.setBalancesAndAllowancesAsync();
-        const erc721Balances = await erc721Wrapper.getBalancesAsync();
-        erc721MakerAssetIds = erc721Balances[makerAddress][erc721Token.address];
-
-        wethContract = await WETH9Contract.deployFrom0xArtifactAsync(tokensArtifacts.WETH9, provider, txDefaults);
-        erc20Wrapper.addDummyTokenContract(wethContract as any);
-
-        const zrxAssetData = assetDataUtils.encodeERC20AssetData(zrxToken.address);
-        const exchangeInstance = await ExchangeContract.deployFrom0xArtifactAsync(
-            protocolArtifacts.Exchange,
-            provider,
-            txDefaults,
-            zrxAssetData,
-        );
-        const exchangeWrapper = new ExchangeWrapper(exchangeInstance, provider);
-        await exchangeWrapper.registerAssetProxyAsync(erc20Proxy.address, owner);
-        await exchangeWrapper.registerAssetProxyAsync(erc721Proxy.address, owner);
-
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeInstance.address, {
-            from: owner,
-        });
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeInstance.address, {
-            from: owner,
-        });
-
-        const dutchAuctionInstance = await DutchAuctionContract.deployFrom0xArtifactAsync(
-            artifacts.DutchAuction,
-            provider,
-            txDefaults,
-            exchangeInstance.address,
-        );
-        dutchAuctionContract = new DutchAuctionContract(
-            dutchAuctionInstance.abi,
-            dutchAuctionInstance.address,
-            provider,
-        );
-        dutchAuctionTestWrapper = new DutchAuctionTestWrapper(dutchAuctionInstance, provider);
-
-        defaultMakerAssetAddress = erc20TokenA.address;
-        const defaultTakerAssetAddress = wethContract.address;
-
-        // Set up taker WETH balance and allowance
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await wethContract.deposit.sendTransactionAsync({
-                from: takerAddress,
-                value: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), DECIMALS_DEFAULT),
-            }),
-        );
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await wethContract.approve.sendTransactionAsync(
-                erc20Proxy.address,
-                constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
-                { from: takerAddress },
-            ),
-        );
-        web3Wrapper.abiDecoder.addABI(exchangeInstance.abi);
-        web3Wrapper.abiDecoder.addABI(zrxToken.abi);
-        erc20Wrapper.addTokenOwnerAddress(dutchAuctionContract.address);
-
-        currentBlockTimestamp = await getLatestBlockTimestampAsync();
-        // Default auction begins 10 minutes ago
-        auctionBeginTimeSeconds = new BigNumber(currentBlockTimestamp).minus(tenMinutesInSeconds);
-        // Default auction ends 10 from now
-        auctionEndTimeSeconds = new BigNumber(currentBlockTimestamp).plus(tenMinutesInSeconds);
-        auctionBeginAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(10), DECIMALS_DEFAULT);
-        auctionEndAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT);
-
-        // Default sell order and buy order are exact mirrors
-        const sellerDefaultOrderParams = {
-            salt: generatePseudoRandomSalt(),
-            exchangeAddress: exchangeInstance.address,
-            makerAddress,
-            feeRecipientAddress,
-            // taker address or sender address should be set to the ducth auction contract
-            takerAddress: dutchAuctionContract.address,
-            makerAssetData: DutchAuctionWrapper.encodeDutchAuctionAssetData(
-                assetDataUtils.encodeERC20AssetData(defaultMakerAssetAddress),
-                auctionBeginTimeSeconds,
-                auctionBeginAmount,
-            ),
-            takerAssetData: assetDataUtils.encodeERC20AssetData(defaultTakerAssetAddress),
-            makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), DECIMALS_DEFAULT),
-            takerAssetAmount: auctionEndAmount,
-            expirationTimeSeconds: auctionEndTimeSeconds,
-            makerFee: constants.ZERO_AMOUNT,
-            takerFee: constants.ZERO_AMOUNT,
-        };
-        // Default buy order is for the auction begin price
-        const buyerDefaultOrderParams = {
-            ...sellerDefaultOrderParams,
-            makerAddress: takerAddress,
-            makerAssetData: sellerDefaultOrderParams.takerAssetData,
-            takerAssetData: sellerDefaultOrderParams.makerAssetData,
-            makerAssetAmount: auctionBeginAmount,
-            takerAssetAmount: sellerDefaultOrderParams.makerAssetAmount,
-        };
-        const makerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddress)];
-        const takerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(takerAddress)];
-        sellerOrderFactory = new OrderFactory(makerPrivateKey, sellerDefaultOrderParams);
-        buyerOrderFactory = new OrderFactory(takerPrivateKey, buyerDefaultOrderParams);
-        defaultERC20MakerAssetData = assetDataUtils.encodeERC20AssetData(defaultMakerAssetAddress);
-    });
-    after(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-    beforeEach(async () => {
-        await blockchainLifecycle.startAsync();
-        erc20Balances = await erc20Wrapper.getBalancesAsync();
-        sellOrder = await sellerOrderFactory.newSignedOrderAsync();
-        buyOrder = await buyerOrderFactory.newSignedOrderAsync();
-    });
-    afterEach(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-    describe('matchOrders', () => {
-        it('should be worth the begin price at the begining of the auction', async () => {
-            auctionBeginTimeSeconds = new BigNumber(currentBlockTimestamp + 2);
-            const makerAssetData = DutchAuctionWrapper.encodeDutchAuctionAssetData(
-                defaultERC20MakerAssetData,
-                auctionBeginTimeSeconds,
-                auctionBeginAmount,
-            );
-            sellOrder = await sellerOrderFactory.newSignedOrderAsync({ makerAssetData });
-            const auctionDetails = await dutchAuctionTestWrapper.getAuctionDetailsAsync(sellOrder);
-            expect(auctionDetails.currentTimeSeconds).to.be.bignumber.lte(auctionBeginTimeSeconds);
-            expect(auctionDetails.currentAmount).to.be.bignumber.equal(auctionBeginAmount);
-            expect(auctionDetails.beginAmount).to.be.bignumber.equal(auctionBeginAmount);
-        });
-        it('should be be worth the end price at the end of the auction', async () => {
-            auctionBeginTimeSeconds = new BigNumber(currentBlockTimestamp - tenMinutesInSeconds * 2);
-            auctionEndTimeSeconds = new BigNumber(currentBlockTimestamp - tenMinutesInSeconds);
-            const makerAssetData = DutchAuctionWrapper.encodeDutchAuctionAssetData(
-                defaultERC20MakerAssetData,
-                auctionBeginTimeSeconds,
-                auctionBeginAmount,
-            );
-            sellOrder = await sellerOrderFactory.newSignedOrderAsync({
-                makerAssetData,
-                expirationTimeSeconds: auctionEndTimeSeconds,
-            });
-            const auctionDetails = await dutchAuctionTestWrapper.getAuctionDetailsAsync(sellOrder);
-            expect(auctionDetails.currentTimeSeconds).to.be.bignumber.gte(auctionEndTimeSeconds);
-            expect(auctionDetails.currentAmount).to.be.bignumber.equal(auctionEndAmount);
-            expect(auctionDetails.beginAmount).to.be.bignumber.equal(auctionBeginAmount);
-        });
-        it('should match orders at current amount and send excess to buyer', async () => {
-            const beforeAuctionDetails = await dutchAuctionTestWrapper.getAuctionDetailsAsync(sellOrder);
-            buyOrder = await buyerOrderFactory.newSignedOrderAsync({
-                makerAssetAmount: beforeAuctionDetails.currentAmount.times(2),
-            });
-            await dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress);
-            const afterAuctionDetails = await dutchAuctionTestWrapper.getAuctionDetailsAsync(sellOrder);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            expect(newBalances[dutchAuctionContract.address][wethContract.address]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            // HACK gte used here due to a bug in ganache where the timestamp can change
-            // between multiple calls to the same block. Which can move the amount in our case
-            // ref: https://github.com/trufflesuite/ganache-core/issues/111
-            expect(newBalances[makerAddress][wethContract.address]).to.be.bignumber.gte(
-                erc20Balances[makerAddress][wethContract.address].plus(afterAuctionDetails.currentAmount),
-            );
-            expect(newBalances[takerAddress][wethContract.address]).to.be.bignumber.gte(
-                erc20Balances[takerAddress][wethContract.address].minus(beforeAuctionDetails.currentAmount),
-            );
-        });
-        it('maker fees on sellOrder are paid to the fee receipient', async () => {
-            sellOrder = await sellerOrderFactory.newSignedOrderAsync({
-                makerFee: new BigNumber(1),
-            });
-            await dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress);
-            const afterAuctionDetails = await dutchAuctionTestWrapper.getAuctionDetailsAsync(sellOrder);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            expect(newBalances[makerAddress][wethContract.address]).to.be.bignumber.gte(
-                erc20Balances[makerAddress][wethContract.address].plus(afterAuctionDetails.currentAmount),
-            );
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(sellOrder.makerFee),
-            );
-        });
-        it('maker fees on buyOrder are paid to the fee receipient', async () => {
-            buyOrder = await buyerOrderFactory.newSignedOrderAsync({
-                makerFee: new BigNumber(1),
-            });
-            await dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const afterAuctionDetails = await dutchAuctionTestWrapper.getAuctionDetailsAsync(sellOrder);
-            expect(newBalances[makerAddress][wethContract.address]).to.be.bignumber.gte(
-                erc20Balances[makerAddress][wethContract.address].plus(afterAuctionDetails.currentAmount),
-            );
-            expect(newBalances[feeRecipientAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[feeRecipientAddress][zrxToken.address].plus(buyOrder.makerFee),
-            );
-        });
-        it('should revert when auction expires', async () => {
-            auctionBeginTimeSeconds = new BigNumber(currentBlockTimestamp - tenMinutesInSeconds * 2);
-            auctionEndTimeSeconds = new BigNumber(currentBlockTimestamp - tenMinutesInSeconds);
-            const makerAssetData = DutchAuctionWrapper.encodeDutchAuctionAssetData(
-                defaultERC20MakerAssetData,
-                auctionBeginTimeSeconds,
-                auctionBeginAmount,
-            );
-            sellOrder = await sellerOrderFactory.newSignedOrderAsync({
-                expirationTimeSeconds: auctionEndTimeSeconds,
-                makerAssetData,
-            });
-            return expectTransactionFailedAsync(
-                dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress),
-                RevertReason.AuctionExpired,
-            );
-        });
-        it('cannot be filled for less than the current price', async () => {
-            buyOrder = await buyerOrderFactory.newSignedOrderAsync({
-                makerAssetAmount: sellOrder.takerAssetAmount,
-            });
-            return expectTransactionFailedAsync(
-                dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress),
-                RevertReason.AuctionInvalidAmount,
-            );
-        });
-        it('auction begin amount must be higher than final amount ', async () => {
-            sellOrder = await sellerOrderFactory.newSignedOrderAsync({
-                takerAssetAmount: auctionBeginAmount.plus(1),
-            });
-            return expectTransactionFailedAsync(
-                dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress),
-                RevertReason.AuctionInvalidAmount,
-            );
-        });
-        it('begin time is less than end time', async () => {
-            auctionBeginTimeSeconds = new BigNumber(auctionEndTimeSeconds).plus(tenMinutesInSeconds);
-            const makerAssetData = DutchAuctionWrapper.encodeDutchAuctionAssetData(
-                defaultERC20MakerAssetData,
-                auctionBeginTimeSeconds,
-                auctionBeginAmount,
-            );
-            sellOrder = await sellerOrderFactory.newSignedOrderAsync({
-                expirationTimeSeconds: auctionEndTimeSeconds,
-                makerAssetData,
-            });
-            return expectTransactionFailedAsync(
-                dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress),
-                RevertReason.AuctionInvalidBeginTime,
-            );
-        });
-        it('asset data contains auction parameters', async () => {
-            sellOrder = await sellerOrderFactory.newSignedOrderAsync({
-                makerAssetData: assetDataUtils.encodeERC20AssetData(defaultMakerAssetAddress),
-            });
-            return expectTransactionFailedAsync(
-                dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress),
-                RevertReason.InvalidAssetData,
-            );
-        });
-
-        describe('ERC721', () => {
-            it('should match orders when ERC721', async () => {
-                const makerAssetId = erc721MakerAssetIds[0];
-                const erc721MakerAssetData = assetDataUtils.encodeERC721AssetData(erc721Token.address, makerAssetId);
-                const makerAssetData = DutchAuctionWrapper.encodeDutchAuctionAssetData(
-                    erc721MakerAssetData,
-                    auctionBeginTimeSeconds,
-                    auctionBeginAmount,
-                );
-                sellOrder = await sellerOrderFactory.newSignedOrderAsync({
-                    makerAssetAmount: new BigNumber(1),
-                    makerAssetData,
-                });
-                buyOrder = await buyerOrderFactory.newSignedOrderAsync({
-                    takerAssetAmount: new BigNumber(1),
-                    takerAssetData: sellOrder.makerAssetData,
-                });
-                await dutchAuctionTestWrapper.matchOrdersAsync(buyOrder, sellOrder, takerAddress);
-                const afterAuctionDetails = await dutchAuctionTestWrapper.getAuctionDetailsAsync(sellOrder);
-                const newBalances = await erc20Wrapper.getBalancesAsync();
-                // HACK gte used here due to a bug in ganache where the timestamp can change
-                // between multiple calls to the same block. Which can move the amount in our case
-                // ref: https://github.com/trufflesuite/ganache-core/issues/111
-                expect(newBalances[makerAddress][wethContract.address]).to.be.bignumber.gte(
-                    erc20Balances[makerAddress][wethContract.address].plus(afterAuctionDetails.currentAmount),
-                );
-                const newOwner = await erc721Token.ownerOf.callAsync(makerAssetId);
-                expect(newOwner).to.be.bignumber.equal(takerAddress);
-            });
-        });
-    });
-});
diff --git a/contracts/extensions/test/extensions/forwarder.ts b/contracts/extensions/test/extensions/forwarder.ts
deleted file mode 100644
index 69939ed04..000000000
--- a/contracts/extensions/test/extensions/forwarder.ts
+++ /dev/null
@@ -1,1291 +0,0 @@
-import {
-    artifacts as protocolArtifacts,
-    ERC20Wrapper,
-    ERC721Wrapper,
-    ExchangeContract,
-    ExchangeWrapper,
-} from '@0x/contracts-protocol';
-import {
-    chaiSetup,
-    constants,
-    ContractName,
-    ERC20BalancesByOwner,
-    expectContractCreationFailedAsync,
-    expectTransactionFailedAsync,
-    OrderFactory,
-    provider,
-    sendTransactionResult,
-    txDefaults,
-    web3Wrapper,
-} from '@0x/contracts-test-utils';
-import {
-    artifacts as tokenArtifacts,
-    DummyERC20TokenContract,
-    DummyERC721TokenContract,
-    WETH9Contract,
-} from '@0x/contracts-tokens';
-import { BlockchainLifecycle } from '@0x/dev-utils';
-import { assetDataUtils } from '@0x/order-utils';
-import { RevertReason, SignedOrder } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import * as chai from 'chai';
-import { TransactionReceiptWithDecodedLogs } from 'ethereum-types';
-
-import { ForwarderContract } from '../../generated-wrappers/forwarder';
-import { artifacts } from '../../src/artifacts';
-
-import { ForwarderWrapper } from '../utils/forwarder_wrapper';
-
-chaiSetup.configure();
-const expect = chai.expect;
-const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-const DECIMALS_DEFAULT = 18;
-const MAX_WETH_FILL_PERCENTAGE = 95;
-
-describe(ContractName.Forwarder, () => {
-    let makerAddress: string;
-    let owner: string;
-    let takerAddress: string;
-    let feeRecipientAddress: string;
-    let defaultMakerAssetAddress: string;
-    let zrxAssetData: string;
-    let wethAssetData: string;
-
-    let weth: DummyERC20TokenContract;
-    let zrxToken: DummyERC20TokenContract;
-    let erc20TokenA: DummyERC20TokenContract;
-    let erc721Token: DummyERC721TokenContract;
-    let forwarderContract: ForwarderContract;
-    let wethContract: WETH9Contract;
-    let forwarderWrapper: ForwarderWrapper;
-    let exchangeWrapper: ExchangeWrapper;
-
-    let orderWithoutFee: SignedOrder;
-    let orderWithFee: SignedOrder;
-    let feeOrder: SignedOrder;
-    let orderFactory: OrderFactory;
-    let erc20Wrapper: ERC20Wrapper;
-    let erc20Balances: ERC20BalancesByOwner;
-    let tx: TransactionReceiptWithDecodedLogs;
-
-    let erc721MakerAssetIds: BigNumber[];
-    let takerEthBalanceBefore: BigNumber;
-    let feePercentage: BigNumber;
-    let gasPrice: BigNumber;
-
-    before(async () => {
-        await blockchainLifecycle.startAsync();
-        const accounts = await web3Wrapper.getAvailableAddressesAsync();
-        const usedAddresses = ([owner, makerAddress, takerAddress, feeRecipientAddress] = accounts);
-
-        const txHash = await web3Wrapper.sendTransactionAsync({ from: accounts[0], to: accounts[0], value: 0 });
-        const transaction = await web3Wrapper.getTransactionByHashAsync(txHash);
-        gasPrice = new BigNumber(transaction.gasPrice);
-
-        const erc721Wrapper = new ERC721Wrapper(provider, usedAddresses, owner);
-        erc20Wrapper = new ERC20Wrapper(provider, usedAddresses, owner);
-
-        const numDummyErc20ToDeploy = 3;
-        [erc20TokenA, zrxToken] = await erc20Wrapper.deployDummyTokensAsync(
-            numDummyErc20ToDeploy,
-            constants.DUMMY_TOKEN_DECIMALS,
-        );
-        const erc20Proxy = await erc20Wrapper.deployProxyAsync();
-        await erc20Wrapper.setBalancesAndAllowancesAsync();
-
-        [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
-        const erc721Proxy = await erc721Wrapper.deployProxyAsync();
-        await erc721Wrapper.setBalancesAndAllowancesAsync();
-        const erc721Balances = await erc721Wrapper.getBalancesAsync();
-        erc721MakerAssetIds = erc721Balances[makerAddress][erc721Token.address];
-
-        wethContract = await WETH9Contract.deployFrom0xArtifactAsync(tokenArtifacts.WETH9, provider, txDefaults);
-        weth = new DummyERC20TokenContract(wethContract.abi, wethContract.address, provider);
-        erc20Wrapper.addDummyTokenContract(weth);
-
-        wethAssetData = assetDataUtils.encodeERC20AssetData(wethContract.address);
-        zrxAssetData = assetDataUtils.encodeERC20AssetData(zrxToken.address);
-        const exchangeInstance = await ExchangeContract.deployFrom0xArtifactAsync(
-            protocolArtifacts.Exchange,
-            provider,
-            txDefaults,
-            zrxAssetData,
-        );
-        exchangeWrapper = new ExchangeWrapper(exchangeInstance, provider);
-        await exchangeWrapper.registerAssetProxyAsync(erc20Proxy.address, owner);
-        await exchangeWrapper.registerAssetProxyAsync(erc721Proxy.address, owner);
-
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeInstance.address, {
-            from: owner,
-        });
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeInstance.address, {
-            from: owner,
-        });
-
-        defaultMakerAssetAddress = erc20TokenA.address;
-        const defaultTakerAssetAddress = wethContract.address;
-        const defaultOrderParams = {
-            exchangeAddress: exchangeInstance.address,
-            makerAddress,
-            feeRecipientAddress,
-            makerAssetData: assetDataUtils.encodeERC20AssetData(defaultMakerAssetAddress),
-            takerAssetData: assetDataUtils.encodeERC20AssetData(defaultTakerAssetAddress),
-            makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), DECIMALS_DEFAULT),
-            takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), DECIMALS_DEFAULT),
-            makerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-            takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(0), DECIMALS_DEFAULT),
-        };
-        const privateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddress)];
-        orderFactory = new OrderFactory(privateKey, defaultOrderParams);
-
-        const forwarderInstance = await ForwarderContract.deployFrom0xArtifactAsync(
-            artifacts.Forwarder,
-            provider,
-            txDefaults,
-            exchangeInstance.address,
-            zrxAssetData,
-            wethAssetData,
-        );
-        forwarderContract = new ForwarderContract(forwarderInstance.abi, forwarderInstance.address, provider);
-        forwarderWrapper = new ForwarderWrapper(forwarderContract, provider);
-        const zrxDepositAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(10000), 18);
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await zrxToken.transfer.sendTransactionAsync(forwarderContract.address, zrxDepositAmount),
-        );
-        erc20Wrapper.addTokenOwnerAddress(forwarderInstance.address);
-    });
-    after(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-    beforeEach(async () => {
-        await blockchainLifecycle.startAsync();
-        erc20Balances = await erc20Wrapper.getBalancesAsync();
-        takerEthBalanceBefore = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-        orderWithoutFee = await orderFactory.newSignedOrderAsync();
-        feeOrder = await orderFactory.newSignedOrderAsync({
-            makerAssetData: assetDataUtils.encodeERC20AssetData(zrxToken.address),
-            takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-        });
-        orderWithFee = await orderFactory.newSignedOrderAsync({
-            takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-        });
-    });
-    afterEach(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-
-    describe('constructor', () => {
-        it('should revert if assetProxy is unregistered', async () => {
-            const exchangeInstance = await ExchangeContract.deployFrom0xArtifactAsync(
-                protocolArtifacts.Exchange,
-                provider,
-                txDefaults,
-                zrxAssetData,
-            );
-            return expectContractCreationFailedAsync(
-                (ForwarderContract.deployFrom0xArtifactAsync(
-                    artifacts.Forwarder,
-                    provider,
-                    txDefaults,
-                    exchangeInstance.address,
-                    zrxAssetData,
-                    wethAssetData,
-                ) as any) as sendTransactionResult,
-                RevertReason.UnregisteredAssetProxy,
-            );
-        });
-    });
-    describe('marketSellOrdersWithEth without extra fees', () => {
-        it('should fill a single order', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const ethValue = orderWithoutFee.takerAssetAmount.dividedToIntegerBy(2);
-
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithoutFee, feeOrders, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ForwarderWrapper.getPercentageOfValue(
-                ethValue,
-                MAX_WETH_FILL_PERCENTAGE,
-            );
-            const makerAssetFillAmount = primaryTakerAssetFillAmount
-                .times(orderWithoutFee.makerAssetAmount)
-                .dividedToIntegerBy(orderWithoutFee.takerAssetAmount);
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should fill multiple orders', async () => {
-            const secondOrderWithoutFee = await orderFactory.newSignedOrderAsync();
-            const ordersWithoutFee = [orderWithoutFee, secondOrderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const ethValue = ordersWithoutFee[0].takerAssetAmount.plus(
-                ordersWithoutFee[1].takerAssetAmount.dividedToIntegerBy(2),
-            );
-
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithoutFee, feeOrders, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ForwarderWrapper.getPercentageOfValue(
-                ethValue,
-                MAX_WETH_FILL_PERCENTAGE,
-            );
-            const firstTakerAssetFillAmount = ordersWithoutFee[0].takerAssetAmount;
-            const secondTakerAssetFillAmount = primaryTakerAssetFillAmount.minus(firstTakerAssetFillAmount);
-
-            const makerAssetFillAmount = ordersWithoutFee[0].makerAssetAmount.plus(
-                ordersWithoutFee[1].makerAssetAmount
-                    .times(secondTakerAssetFillAmount)
-                    .dividedToIntegerBy(ordersWithoutFee[1].takerAssetAmount),
-            );
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should fill the order and pay ZRX fees from a single feeOrder', async () => {
-            const ordersWithFee = [orderWithFee];
-            const feeOrders = [feeOrder];
-            const ethValue = orderWithFee.takerAssetAmount.dividedToIntegerBy(2);
-
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithFee, feeOrders, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ForwarderWrapper.getPercentageOfValue(
-                ethValue,
-                MAX_WETH_FILL_PERCENTAGE,
-            );
-            const makerAssetFillAmount = primaryTakerAssetFillAmount
-                .times(orderWithoutFee.makerAssetAmount)
-                .dividedToIntegerBy(orderWithoutFee.takerAssetAmount);
-            const feeAmount = ForwarderWrapper.getPercentageOfValue(
-                orderWithFee.takerFee.dividedToIntegerBy(2),
-                MAX_WETH_FILL_PERCENTAGE,
-            );
-            const wethSpentOnFeeOrders = ForwarderWrapper.getWethForFeeOrders(feeAmount, feeOrders);
-            const totalEthSpent = primaryTakerAssetFillAmount
-                .plus(wethSpentOnFeeOrders)
-                .plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount).plus(wethSpentOnFeeOrders),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should fill the orders and pay ZRX from multiple feeOrders', async () => {
-            const ordersWithFee = [orderWithFee];
-            const ethValue = orderWithFee.takerAssetAmount;
-            const makerAssetData = assetDataUtils.encodeERC20AssetData(zrxToken.address);
-            const makerAssetAmount = orderWithFee.takerFee.dividedToIntegerBy(2);
-            const takerAssetAmount = feeOrder.takerAssetAmount
-                .times(makerAssetAmount)
-                .dividedToIntegerBy(feeOrder.makerAssetAmount);
-
-            const firstFeeOrder = await orderFactory.newSignedOrderAsync({
-                makerAssetData,
-                makerAssetAmount,
-                takerAssetAmount,
-            });
-            const secondFeeOrder = await orderFactory.newSignedOrderAsync({
-                makerAssetData,
-                makerAssetAmount,
-                takerAssetAmount,
-            });
-            const feeOrders = [firstFeeOrder, secondFeeOrder];
-
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithFee, feeOrders, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ForwarderWrapper.getPercentageOfValue(
-                ethValue,
-                MAX_WETH_FILL_PERCENTAGE,
-            );
-            const makerAssetFillAmount = primaryTakerAssetFillAmount
-                .times(orderWithoutFee.makerAssetAmount)
-                .dividedToIntegerBy(orderWithoutFee.takerAssetAmount);
-            const feeAmount = ForwarderWrapper.getPercentageOfValue(orderWithFee.takerFee, MAX_WETH_FILL_PERCENTAGE);
-            const wethSpentOnFeeOrders = ForwarderWrapper.getWethForFeeOrders(feeAmount, feeOrders);
-            const totalEthSpent = primaryTakerAssetFillAmount
-                .plus(wethSpentOnFeeOrders)
-                .plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount).plus(wethSpentOnFeeOrders),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should fill the order when token is ZRX with fees', async () => {
-            orderWithFee = await orderFactory.newSignedOrderAsync({
-                makerAssetData: assetDataUtils.encodeERC20AssetData(zrxToken.address),
-                takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-            });
-            const ordersWithFee = [orderWithFee];
-            const feeOrders: SignedOrder[] = [];
-            const ethValue = orderWithFee.takerAssetAmount.dividedToIntegerBy(2);
-
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithFee, feeOrders, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const makerAssetFillAmount = orderWithFee.makerAssetAmount.dividedToIntegerBy(2);
-            const totalEthSpent = ethValue.plus(gasPrice.times(tx.gasUsed));
-            const takerFeePaid = orderWithFee.takerFee.dividedToIntegerBy(2);
-            const makerFeePaid = orderWithFee.makerFee.dividedToIntegerBy(2);
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrxToken.address].minus(makerAssetFillAmount).minus(makerFeePaid),
-            );
-            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrxToken.address].plus(makerAssetFillAmount).minus(takerFeePaid),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(ethValue),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[forwarderContract.address][zrxToken.address],
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should refund remaining ETH if amount is greater than takerAssetAmount', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const ethValue = orderWithoutFee.takerAssetAmount.times(2);
-
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithoutFee, feeOrders, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const totalEthSpent = orderWithoutFee.takerAssetAmount.plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-        });
-        it('should revert if ZRX cannot be fully repurchased', async () => {
-            orderWithFee = await orderFactory.newSignedOrderAsync({
-                takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(50), DECIMALS_DEFAULT),
-            });
-            const ordersWithFee = [orderWithFee];
-            feeOrder = await orderFactory.newSignedOrderAsync({
-                makerAssetData: assetDataUtils.encodeERC20AssetData(zrxToken.address),
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-            });
-            const feeOrders = [feeOrder];
-            const ethValue = orderWithFee.takerAssetAmount;
-            return expectTransactionFailedAsync(
-                forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithFee, feeOrders, {
-                    value: ethValue,
-                    from: takerAddress,
-                }),
-                RevertReason.CompleteFillFailed,
-            );
-        });
-        it('should not fill orders with different makerAssetData than the first order', async () => {
-            const makerAssetId = erc721MakerAssetIds[0];
-            const erc721SignedOrder = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber(1),
-                makerAssetData: assetDataUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
-            });
-            const erc20SignedOrder = await orderFactory.newSignedOrderAsync();
-            const ordersWithoutFee = [erc20SignedOrder, erc721SignedOrder];
-            const feeOrders: SignedOrder[] = [];
-            const ethValue = erc20SignedOrder.takerAssetAmount.plus(erc721SignedOrder.takerAssetAmount);
-
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(ordersWithoutFee, feeOrders, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const totalEthSpent = erc20SignedOrder.takerAssetAmount.plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-        });
-    });
-    describe('marketSellOrdersWithEth with extra fees', () => {
-        it('should fill the order and send fee to feeRecipient', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const ethValue = orderWithoutFee.takerAssetAmount.div(2);
-
-            const baseFeePercentage = 2;
-            feePercentage = ForwarderWrapper.getPercentageOfValue(constants.PERCENTAGE_DENOMINATOR, baseFeePercentage);
-            const feeRecipientEthBalanceBefore = await web3Wrapper.getBalanceInWeiAsync(feeRecipientAddress);
-            tx = await forwarderWrapper.marketSellOrdersWithEthAsync(
-                ordersWithoutFee,
-                feeOrders,
-                {
-                    value: ethValue,
-                    from: takerAddress,
-                },
-                { feePercentage, feeRecipient: feeRecipientAddress },
-            );
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const feeRecipientEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(feeRecipientAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ForwarderWrapper.getPercentageOfValue(
-                ethValue,
-                MAX_WETH_FILL_PERCENTAGE,
-            );
-            const makerAssetFillAmount = primaryTakerAssetFillAmount
-                .times(orderWithoutFee.makerAssetAmount)
-                .dividedToIntegerBy(orderWithoutFee.takerAssetAmount);
-            const ethSpentOnFee = ForwarderWrapper.getPercentageOfValue(primaryTakerAssetFillAmount, baseFeePercentage);
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(ethSpentOnFee).plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(feeRecipientEthBalanceAfter).to.be.bignumber.equal(feeRecipientEthBalanceBefore.plus(ethSpentOnFee));
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should fail if the fee is set too high', async () => {
-            const ethValue = orderWithoutFee.takerAssetAmount.div(2);
-            const baseFeePercentage = 6;
-            feePercentage = ForwarderWrapper.getPercentageOfValue(ethValue, baseFeePercentage);
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            await expectTransactionFailedAsync(
-                forwarderWrapper.marketSellOrdersWithEthAsync(
-                    ordersWithoutFee,
-                    feeOrders,
-                    { from: takerAddress, value: ethValue, gasPrice },
-                    { feePercentage, feeRecipient: feeRecipientAddress },
-                ),
-                RevertReason.FeePercentageTooLarge,
-            );
-        });
-        it('should fail if there is not enough ETH remaining to pay the fee', async () => {
-            const ethValue = orderWithoutFee.takerAssetAmount.div(2);
-            const baseFeePercentage = 5;
-            feePercentage = ForwarderWrapper.getPercentageOfValue(constants.PERCENTAGE_DENOMINATOR, baseFeePercentage);
-            const ordersWithFee = [orderWithFee];
-            const feeOrders = [feeOrder];
-            await expectTransactionFailedAsync(
-                forwarderWrapper.marketSellOrdersWithEthAsync(
-                    ordersWithFee,
-                    feeOrders,
-                    { from: takerAddress, value: ethValue, gasPrice },
-                    { feePercentage, feeRecipient: feeRecipientAddress },
-                ),
-                RevertReason.InsufficientEthRemaining,
-            );
-        });
-    });
-    describe('marketBuyOrdersWithEth without extra fees', () => {
-        it('should buy the exact amount of makerAsset in a single order', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = orderWithoutFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithoutFee.takerAssetAmount.dividedToIntegerBy(2);
-
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithoutFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should buy the exact amount of makerAsset in multiple orders', async () => {
-            const secondOrderWithoutFee = await orderFactory.newSignedOrderAsync();
-            const ordersWithoutFee = [orderWithoutFee, secondOrderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = ordersWithoutFee[0].makerAssetAmount.plus(
-                ordersWithoutFee[1].makerAssetAmount.dividedToIntegerBy(2),
-            );
-            const ethValue = ordersWithoutFee[0].takerAssetAmount.plus(
-                ordersWithoutFee[1].takerAssetAmount.dividedToIntegerBy(2),
-            );
-
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithoutFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should buy the exact amount of makerAsset and return excess ETH', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = orderWithoutFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithoutFee.takerAssetAmount;
-
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithoutFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ethValue.dividedToIntegerBy(2);
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should buy the exact amount of makerAsset and pay ZRX from feeOrders', async () => {
-            const ordersWithFee = [orderWithFee];
-            const feeOrders = [feeOrder];
-            const makerAssetFillAmount = orderWithFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithFee.takerAssetAmount;
-
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = orderWithFee.takerAssetAmount.dividedToIntegerBy(2);
-            const feeAmount = orderWithFee.takerFee.dividedToIntegerBy(2);
-            const wethSpentOnFeeOrders = ForwarderWrapper.getWethForFeeOrders(feeAmount, feeOrders);
-            const totalEthSpent = primaryTakerAssetFillAmount
-                .plus(wethSpentOnFeeOrders)
-                .plus(gasPrice.times(tx.gasUsed));
-
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount).plus(wethSpentOnFeeOrders),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should buy slightly greater than makerAssetAmount when buying ZRX', async () => {
-            orderWithFee = await orderFactory.newSignedOrderAsync({
-                makerAssetData: assetDataUtils.encodeERC20AssetData(zrxToken.address),
-                takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-            });
-            const ordersWithFee = [orderWithFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = orderWithFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithFee.takerAssetAmount;
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ForwarderWrapper.getWethForFeeOrders(
-                makerAssetFillAmount,
-                ordersWithFee,
-            );
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            const makerAssetFilledAmount = orderWithFee.makerAssetAmount
-                .times(primaryTakerAssetFillAmount)
-                .dividedToIntegerBy(orderWithFee.takerAssetAmount);
-            const takerFeePaid = orderWithFee.takerFee
-                .times(primaryTakerAssetFillAmount)
-                .dividedToIntegerBy(orderWithFee.takerAssetAmount);
-            const makerFeePaid = orderWithFee.makerFee
-                .times(primaryTakerAssetFillAmount)
-                .dividedToIntegerBy(orderWithFee.takerAssetAmount);
-            const totalZrxPurchased = makerAssetFilledAmount.minus(takerFeePaid);
-            // Up to 1 wei worth of ZRX will be overbought per order
-            const maxOverboughtZrx = new BigNumber(1)
-                .times(orderWithFee.makerAssetAmount)
-                .dividedToIntegerBy(orderWithFee.takerAssetAmount);
-
-            expect(totalZrxPurchased).to.be.bignumber.gte(makerAssetFillAmount);
-            expect(totalZrxPurchased).to.be.bignumber.lte(makerAssetFillAmount.plus(maxOverboughtZrx));
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrxToken.address].minus(makerAssetFilledAmount).minus(makerFeePaid),
-            );
-            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrxToken.address].plus(totalZrxPurchased),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[forwarderContract.address][zrxToken.address],
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should revert if the amount of ETH sent is too low to fill the makerAssetAmount', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = orderWithoutFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithoutFee.takerAssetAmount.dividedToIntegerBy(4);
-            return expectTransactionFailedAsync(
-                forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithoutFee, feeOrders, makerAssetFillAmount, {
-                    value: ethValue,
-                    from: takerAddress,
-                }),
-                RevertReason.CompleteFillFailed,
-            );
-        });
-        it('should buy an ERC721 asset from a single order', async () => {
-            const makerAssetId = erc721MakerAssetIds[0];
-            orderWithoutFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber(1),
-                makerAssetData: assetDataUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
-            });
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = new BigNumber(1);
-            const ethValue = orderWithFee.takerAssetAmount;
-
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithoutFee, feeOrders, makerAssetFillAmount, {
-                from: takerAddress,
-                value: ethValue,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newOwner = await erc721Token.ownerOf.callAsync(makerAssetId);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            expect(newOwner).to.be.bignumber.equal(takerAddress);
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should revert if buying an ERC721 asset when later orders contain different makerAssetData', async () => {
-            const makerAssetId = erc721MakerAssetIds[0];
-            orderWithoutFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber(1),
-                makerAssetData: assetDataUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
-            });
-            const differentMakerAssetDataOrder = await orderFactory.newSignedOrderAsync();
-            const ordersWithoutFee = [orderWithoutFee, differentMakerAssetDataOrder];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = new BigNumber(1).plus(differentMakerAssetDataOrder.makerAssetAmount);
-            const ethValue = orderWithFee.takerAssetAmount;
-            return expectTransactionFailedAsync(
-                forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithoutFee, feeOrders, makerAssetFillAmount, {
-                    value: ethValue,
-                    from: takerAddress,
-                }),
-                RevertReason.CompleteFillFailed,
-            );
-        });
-        it('should buy an ERC721 asset and pay ZRX fees from a single fee order', async () => {
-            const makerAssetId = erc721MakerAssetIds[0];
-            orderWithFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber(1),
-                makerAssetData: assetDataUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
-                takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-            });
-            const ordersWithFee = [orderWithFee];
-            const feeOrders = [feeOrder];
-            const makerAssetFillAmount = orderWithFee.makerAssetAmount;
-            const primaryTakerAssetFillAmount = orderWithFee.takerAssetAmount;
-            const feeAmount = orderWithFee.takerFee;
-            const wethSpentOnFeeOrders = ForwarderWrapper.getWethForFeeOrders(feeAmount, feeOrders);
-            const ethValue = primaryTakerAssetFillAmount.plus(wethSpentOnFeeOrders);
-
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newOwner = await erc721Token.ownerOf.callAsync(makerAssetId);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const totalEthSpent = ethValue.plus(gasPrice.times(tx.gasUsed));
-
-            expect(newOwner).to.be.bignumber.equal(takerAddress);
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount).plus(wethSpentOnFeeOrders),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should buy an ERC721 asset and pay ZRX fees from multiple fee orders', async () => {
-            const makerAssetId = erc721MakerAssetIds[0];
-            orderWithFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber(1),
-                makerAssetData: assetDataUtils.encodeERC721AssetData(erc721Token.address, makerAssetId),
-                takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), DECIMALS_DEFAULT),
-            });
-            const ordersWithFee = [orderWithFee];
-            const makerAssetData = assetDataUtils.encodeERC20AssetData(zrxToken.address);
-            const makerAssetAmount = orderWithFee.takerFee.dividedToIntegerBy(2);
-            const takerAssetAmount = feeOrder.takerAssetAmount
-                .times(makerAssetAmount)
-                .dividedToIntegerBy(feeOrder.makerAssetAmount);
-
-            const firstFeeOrder = await orderFactory.newSignedOrderAsync({
-                makerAssetData,
-                makerAssetAmount,
-                takerAssetAmount,
-            });
-            const secondFeeOrder = await orderFactory.newSignedOrderAsync({
-                makerAssetData,
-                makerAssetAmount,
-                takerAssetAmount,
-            });
-            const feeOrders = [firstFeeOrder, secondFeeOrder];
-
-            const makerAssetFillAmount = orderWithFee.makerAssetAmount;
-            const primaryTakerAssetFillAmount = orderWithFee.takerAssetAmount;
-            const feeAmount = orderWithFee.takerFee;
-            const wethSpentOnFeeOrders = ForwarderWrapper.getWethForFeeOrders(feeAmount, feeOrders);
-            const ethValue = primaryTakerAssetFillAmount.plus(wethSpentOnFeeOrders);
-
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newOwner = await erc721Token.ownerOf.callAsync(makerAssetId);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const totalEthSpent = ethValue.plus(gasPrice.times(tx.gasUsed));
-
-            expect(newOwner).to.be.bignumber.equal(takerAddress);
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount).plus(wethSpentOnFeeOrders),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('Should buy slightly greater MakerAsset when exchange rate is rounded', async () => {
-            // The 0x Protocol contracts round the exchange rate in favor of the Maker.
-            // In this case, the taker must round up how much they're going to spend, which
-            // in turn increases the amount of MakerAsset being purchased.
-            // Example:
-            //  The taker wants to buy 5 units of the MakerAsset at a rate of 3M/2T.
-            //  For every 2 units of TakerAsset, the taker will receive 3 units of MakerAsset.
-            //  To purchase 5 units, the taker must spend 10/3 = 3.33 units of TakerAssset.
-            //  However, the Taker can only spend whole units.
-            //  Spending floor(10/3) = 3 units will yield a profit of Floor(3*3/2) = Floor(4.5) = 4 units of MakerAsset.
-            //  Spending ceil(10/3) = 4 units will yield a profit of Floor(4*3/2) = 6 units of MakerAsset.
-            //
-            //  The forwarding contract will opt for the second option, which overbuys, to ensure the taker
-            //  receives at least the amount of MakerAsset they requested.
-            //
-            // Construct test case using values from example above
-            orderWithoutFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber('30'),
-                takerAssetAmount: new BigNumber('20'),
-                makerAssetData: assetDataUtils.encodeERC20AssetData(erc20TokenA.address),
-                takerAssetData: assetDataUtils.encodeERC20AssetData(weth.address),
-                makerFee: new BigNumber(0),
-                takerFee: new BigNumber(0),
-            });
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const desiredMakerAssetFillAmount = new BigNumber('5');
-            const makerAssetFillAmount = new BigNumber('6');
-            const ethValue = new BigNumber('4');
-            // Execute test case
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(
-                ordersWithoutFee,
-                feeOrders,
-                desiredMakerAssetFillAmount,
-                {
-                    value: ethValue,
-                    from: takerAddress,
-                },
-            );
-            // Fetch end balances and construct expected outputs
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            // Validate test case
-            expect(makerAssetFillAmount).to.be.bignumber.greaterThan(desiredMakerAssetFillAmount);
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('Should buy slightly greater MakerAsset when exchange rate is rounded, and MakerAsset is ZRX', async () => {
-            // See the test case above for a detailed description of this case.
-            // The difference here is that the MakerAsset is ZRX. We expect the same result as above,
-            // but this tests a different code path.
-            //
-            // Construct test case using values from example above
-            orderWithoutFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber('30'),
-                takerAssetAmount: new BigNumber('20'),
-                makerAssetData: zrxAssetData,
-                takerAssetData: assetDataUtils.encodeERC20AssetData(weth.address),
-                makerFee: new BigNumber(0),
-                takerFee: new BigNumber(0),
-            });
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const desiredMakerAssetFillAmount = new BigNumber('5');
-            const makerAssetFillAmount = new BigNumber('6');
-            const ethValue = new BigNumber('4');
-            // Execute test case
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(
-                ordersWithoutFee,
-                feeOrders,
-                desiredMakerAssetFillAmount,
-                {
-                    value: ethValue,
-                    from: takerAddress,
-                },
-            );
-            // Fetch end balances and construct expected outputs
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            // Validate test case
-            expect(makerAssetFillAmount).to.be.bignumber.greaterThan(desiredMakerAssetFillAmount);
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrxToken.address].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrxToken.address].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('Should buy slightly greater MakerAsset when exchange rate is rounded (Regression Test)', async () => {
-            // Order taken from a transaction on mainnet that failed due to a rounding error.
-            orderWithoutFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber('268166666666666666666'),
-                takerAssetAmount: new BigNumber('219090625878836371'),
-                makerAssetData: assetDataUtils.encodeERC20AssetData(erc20TokenA.address),
-                takerAssetData: assetDataUtils.encodeERC20AssetData(weth.address),
-                makerFee: new BigNumber(0),
-                takerFee: new BigNumber(0),
-            });
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            // The taker will receive more than the desired amount of makerAsset due to rounding
-            const desiredMakerAssetFillAmount = new BigNumber('5000000000000000000');
-            const ethValue = new BigNumber('4084971271824171');
-            const makerAssetFillAmount = ethValue
-                .times(orderWithoutFee.makerAssetAmount)
-                .dividedToIntegerBy(orderWithoutFee.takerAssetAmount);
-            // Execute test case
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(
-                ordersWithoutFee,
-                feeOrders,
-                desiredMakerAssetFillAmount,
-                {
-                    value: ethValue,
-                    from: takerAddress,
-                },
-            );
-            // Fetch end balances and construct expected outputs
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            // Validate test case
-            expect(makerAssetFillAmount).to.be.bignumber.greaterThan(desiredMakerAssetFillAmount);
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('Should buy slightly greater MakerAsset when exchange rate is rounded, and MakerAsset is ZRX (Regression Test)', async () => {
-            // Order taken from a transaction on mainnet that failed due to a rounding error.
-            orderWithoutFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber('268166666666666666666'),
-                takerAssetAmount: new BigNumber('219090625878836371'),
-                makerAssetData: zrxAssetData,
-                takerAssetData: assetDataUtils.encodeERC20AssetData(weth.address),
-                makerFee: new BigNumber(0),
-                takerFee: new BigNumber(0),
-            });
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            // The taker will receive more than the desired amount of makerAsset due to rounding
-            const desiredMakerAssetFillAmount = new BigNumber('5000000000000000000');
-            const ethValue = new BigNumber('4084971271824171');
-            const makerAssetFillAmount = ethValue
-                .times(orderWithoutFee.makerAssetAmount)
-                .dividedToIntegerBy(orderWithoutFee.takerAssetAmount);
-            // Execute test case
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(
-                ordersWithoutFee,
-                feeOrders,
-                desiredMakerAssetFillAmount,
-                {
-                    value: ethValue,
-                    from: takerAddress,
-                },
-            );
-            // Fetch end balances and construct expected outputs
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            // Validate test case
-            expect(makerAssetFillAmount).to.be.bignumber.greaterThan(desiredMakerAssetFillAmount);
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrxToken.address].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrxToken.address].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('Should buy correct MakerAsset when exchange rate is NOT rounded, and MakerAsset is ZRX (Regression Test)', async () => {
-            // An extra unit of TakerAsset was sent to the exchange contract to account for rounding errors, in Forwarder v1.
-            // Specifically, the takerFillAmount was calculated using Floor(desiredMakerAmount * exchangeRate) + 1
-            // We have since changed this to be Ceil(desiredMakerAmount * exchangeRate)
-            // These calculations produce different results when `desiredMakerAmount * exchangeRate` is an integer.
-            //
-            // This test verifies that `ceil` is sufficient:
-            //  Let TakerAssetAmount = MakerAssetAmount * 2
-            //  -> exchangeRate = TakerAssetAmount / MakerAssetAmount = (2*MakerAssetAmount)/MakerAssetAmount = 2
-            //  .: desiredMakerAmount * exchangeRate is an integer.
-            //
-            // Construct test case using values from example above
-            orderWithoutFee = await orderFactory.newSignedOrderAsync({
-                makerAssetAmount: new BigNumber('30'),
-                takerAssetAmount: new BigNumber('60'),
-                makerAssetData: zrxAssetData,
-                takerAssetData: assetDataUtils.encodeERC20AssetData(weth.address),
-                makerFee: new BigNumber(0),
-                takerFee: new BigNumber(0),
-            });
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = new BigNumber('5');
-            const ethValue = new BigNumber('10');
-            // Execute test case
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(ordersWithoutFee, feeOrders, makerAssetFillAmount, {
-                value: ethValue,
-                from: takerAddress,
-            });
-            // Fetch end balances and construct expected outputs
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            const primaryTakerAssetFillAmount = ethValue;
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(gasPrice.times(tx.gasUsed));
-            // Validate test case
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][zrxToken.address].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][zrxToken.address].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-    });
-    describe('marketBuyOrdersWithEth with extra fees', () => {
-        it('should buy an asset and send fee to feeRecipient', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = orderWithoutFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithoutFee.takerAssetAmount;
-
-            const baseFeePercentage = 2;
-            feePercentage = ForwarderWrapper.getPercentageOfValue(constants.PERCENTAGE_DENOMINATOR, baseFeePercentage);
-            const feeRecipientEthBalanceBefore = await web3Wrapper.getBalanceInWeiAsync(feeRecipientAddress);
-            tx = await forwarderWrapper.marketBuyOrdersWithEthAsync(
-                ordersWithoutFee,
-                feeOrders,
-                makerAssetFillAmount,
-                {
-                    value: ethValue,
-                    from: takerAddress,
-                },
-                { feePercentage, feeRecipient: feeRecipientAddress },
-            );
-            const takerEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(takerAddress);
-            const forwarderEthBalance = await web3Wrapper.getBalanceInWeiAsync(forwarderContract.address);
-            const feeRecipientEthBalanceAfter = await web3Wrapper.getBalanceInWeiAsync(feeRecipientAddress);
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-
-            const primaryTakerAssetFillAmount = orderWithoutFee.takerAssetAmount.dividedToIntegerBy(2);
-            const ethSpentOnFee = ForwarderWrapper.getPercentageOfValue(primaryTakerAssetFillAmount, baseFeePercentage);
-            const totalEthSpent = primaryTakerAssetFillAmount.plus(ethSpentOnFee).plus(gasPrice.times(tx.gasUsed));
-
-            expect(feeRecipientEthBalanceAfter).to.be.bignumber.equal(feeRecipientEthBalanceBefore.plus(ethSpentOnFee));
-            expect(takerEthBalanceAfter).to.be.bignumber.equal(takerEthBalanceBefore.minus(totalEthSpent));
-            expect(newBalances[makerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][defaultMakerAssetAddress].minus(makerAssetFillAmount),
-            );
-            expect(newBalances[takerAddress][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                erc20Balances[takerAddress][defaultMakerAssetAddress].plus(makerAssetFillAmount),
-            );
-            expect(newBalances[makerAddress][weth.address]).to.be.bignumber.equal(
-                erc20Balances[makerAddress][weth.address].plus(primaryTakerAssetFillAmount),
-            );
-            expect(newBalances[forwarderContract.address][weth.address]).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(newBalances[forwarderContract.address][defaultMakerAssetAddress]).to.be.bignumber.equal(
-                constants.ZERO_AMOUNT,
-            );
-            expect(forwarderEthBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should fail if the fee is set too high', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = orderWithoutFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithoutFee.takerAssetAmount;
-
-            const baseFeePercentage = 6;
-            feePercentage = ForwarderWrapper.getPercentageOfValue(constants.PERCENTAGE_DENOMINATOR, baseFeePercentage);
-            await expectTransactionFailedAsync(
-                forwarderWrapper.marketBuyOrdersWithEthAsync(
-                    ordersWithoutFee,
-                    feeOrders,
-                    makerAssetFillAmount,
-                    {
-                        value: ethValue,
-                        from: takerAddress,
-                    },
-                    { feePercentage, feeRecipient: feeRecipientAddress },
-                ),
-                RevertReason.FeePercentageTooLarge,
-            );
-        });
-        it('should fail if there is not enough ETH remaining to pay the fee', async () => {
-            const ordersWithoutFee = [orderWithoutFee];
-            const feeOrders: SignedOrder[] = [];
-            const makerAssetFillAmount = orderWithoutFee.makerAssetAmount.dividedToIntegerBy(2);
-            const ethValue = orderWithoutFee.takerAssetAmount.dividedToIntegerBy(2);
-
-            const baseFeePercentage = 2;
-            feePercentage = ForwarderWrapper.getPercentageOfValue(constants.PERCENTAGE_DENOMINATOR, baseFeePercentage);
-            await expectTransactionFailedAsync(
-                forwarderWrapper.marketBuyOrdersWithEthAsync(
-                    ordersWithoutFee,
-                    feeOrders,
-                    makerAssetFillAmount,
-                    {
-                        value: ethValue,
-                        from: takerAddress,
-                    },
-                    { feePercentage, feeRecipient: feeRecipientAddress },
-                ),
-                RevertReason.InsufficientEthRemaining,
-            );
-        });
-    });
-    describe('withdrawAsset', () => {
-        it('should allow owner to withdraw ERC20 tokens', async () => {
-            const zrxWithdrawAmount = erc20Balances[forwarderContract.address][zrxToken.address];
-            await forwarderWrapper.withdrawAssetAsync(zrxAssetData, zrxWithdrawAmount, { from: owner });
-            const newBalances = await erc20Wrapper.getBalancesAsync();
-            expect(newBalances[owner][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[owner][zrxToken.address].plus(zrxWithdrawAmount),
-            );
-            expect(newBalances[forwarderContract.address][zrxToken.address]).to.be.bignumber.equal(
-                erc20Balances[forwarderContract.address][zrxToken.address].minus(zrxWithdrawAmount),
-            );
-        });
-        it('should revert if not called by owner', async () => {
-            const zrxWithdrawAmount = erc20Balances[forwarderContract.address][zrxToken.address];
-            await expectTransactionFailedAsync(
-                forwarderWrapper.withdrawAssetAsync(zrxAssetData, zrxWithdrawAmount, { from: makerAddress }),
-                RevertReason.OnlyContractOwner,
-            );
-        });
-    });
-});
-// tslint:disable:max-file-line-count
-// tslint:enable:no-unnecessary-type-assertion
diff --git a/contracts/extensions/test/extensions/order_matcher.ts b/contracts/extensions/test/extensions/order_matcher.ts
deleted file mode 100644
index acb46ced4..000000000
--- a/contracts/extensions/test/extensions/order_matcher.ts
+++ /dev/null
@@ -1,818 +0,0 @@
-import {
-    artifacts as protocolArtifacts,
-    ERC20ProxyContract,
-    ERC20Wrapper,
-    ERC721ProxyContract,
-    ExchangeContract,
-    ExchangeFillEventArgs,
-    ExchangeWrapper,
-} from '@0x/contracts-protocol';
-import {
-    chaiSetup,
-    constants,
-    ERC20BalancesByOwner,
-    expectContractCreationFailedAsync,
-    expectTransactionFailedAsync,
-    LogDecoder,
-    OrderFactory,
-    provider,
-    sendTransactionResult,
-    txDefaults,
-    web3Wrapper,
-} from '@0x/contracts-test-utils';
-import { artifacts as tokenArtifacts, DummyERC20TokenContract, DummyERC721TokenContract } from '@0x/contracts-tokens';
-import { BlockchainLifecycle } from '@0x/dev-utils';
-import { assetDataUtils } from '@0x/order-utils';
-import { RevertReason } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import * as chai from 'chai';
-import { LogWithDecodedArgs } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { OrderMatcherContract } from '../../generated-wrappers/order_matcher';
-import { artifacts } from '../../src/artifacts';
-
-const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-chaiSetup.configure();
-const expect = chai.expect;
-// tslint:disable:no-unnecessary-type-assertion
-describe('OrderMatcher', () => {
-    let makerAddressLeft: string;
-    let makerAddressRight: string;
-    let owner: string;
-    let takerAddress: string;
-    let feeRecipientAddressLeft: string;
-    let feeRecipientAddressRight: string;
-
-    let erc20TokenA: DummyERC20TokenContract;
-    let erc20TokenB: DummyERC20TokenContract;
-    let zrxToken: DummyERC20TokenContract;
-    let exchange: ExchangeContract;
-    let erc20Proxy: ERC20ProxyContract;
-    let erc721Proxy: ERC721ProxyContract;
-    let orderMatcher: OrderMatcherContract;
-
-    let erc20BalancesByOwner: ERC20BalancesByOwner;
-    let exchangeWrapper: ExchangeWrapper;
-    let erc20Wrapper: ERC20Wrapper;
-    let orderFactoryLeft: OrderFactory;
-    let orderFactoryRight: OrderFactory;
-
-    let leftMakerAssetData: string;
-    let leftTakerAssetData: string;
-    let defaultERC20MakerAssetAddress: string;
-    let defaultERC20TakerAssetAddress: string;
-
-    before(async () => {
-        await blockchainLifecycle.startAsync();
-    });
-    after(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-    before(async () => {
-        // Create accounts
-        const accounts = await web3Wrapper.getAvailableAddressesAsync();
-        // Hack(albrow): Both Prettier and TSLint insert a trailing comma below
-        // but that is invalid syntax as of TypeScript version >= 2.8. We don't
-        // have the right fine-grained configuration options in TSLint,
-        // Prettier, or TypeScript, to reconcile this, so we will just have to
-        // wait for them to sort it out. We disable TSLint and Prettier for
-        // this part of the code for now. This occurs several times in this
-        // file. See https://github.com/prettier/prettier/issues/4624.
-        // prettier-ignore
-        const usedAddresses = ([
-            owner,
-            makerAddressLeft,
-            makerAddressRight,
-            takerAddress,
-            feeRecipientAddressLeft,
-            // tslint:disable-next-line:trailing-comma
-            feeRecipientAddressRight
-        ] = _.slice(accounts, 0, 6));
-        // Create wrappers
-        erc20Wrapper = new ERC20Wrapper(provider, usedAddresses, owner);
-        // Deploy ERC20 token & ERC20 proxy
-        const numDummyErc20ToDeploy = 3;
-        [erc20TokenA, erc20TokenB, zrxToken] = await erc20Wrapper.deployDummyTokensAsync(
-            numDummyErc20ToDeploy,
-            constants.DUMMY_TOKEN_DECIMALS,
-        );
-        erc20Proxy = await erc20Wrapper.deployProxyAsync();
-        await erc20Wrapper.setBalancesAndAllowancesAsync();
-        // Deploy ERC721 proxy
-        erc721Proxy = await ERC721ProxyContract.deployFrom0xArtifactAsync(
-            protocolArtifacts.ERC721Proxy,
-            provider,
-            txDefaults,
-        );
-        // Depoy exchange
-        exchange = await ExchangeContract.deployFrom0xArtifactAsync(
-            protocolArtifacts.Exchange,
-            provider,
-            txDefaults,
-            assetDataUtils.encodeERC20AssetData(zrxToken.address),
-        );
-        exchangeWrapper = new ExchangeWrapper(exchange, provider);
-        await exchangeWrapper.registerAssetProxyAsync(erc20Proxy.address, owner);
-        await exchangeWrapper.registerAssetProxyAsync(erc721Proxy.address, owner);
-        // Authorize ERC20 trades by exchange
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, {
-                from: owner,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-        // Deploy OrderMatcher
-        orderMatcher = await OrderMatcherContract.deployFrom0xArtifactAsync(
-            artifacts.OrderMatcher,
-            provider,
-            txDefaults,
-            exchange.address,
-        );
-        // Set default addresses
-        defaultERC20MakerAssetAddress = erc20TokenA.address;
-        defaultERC20TakerAssetAddress = erc20TokenB.address;
-        leftMakerAssetData = assetDataUtils.encodeERC20AssetData(defaultERC20MakerAssetAddress);
-        leftTakerAssetData = assetDataUtils.encodeERC20AssetData(defaultERC20TakerAssetAddress);
-        // Set OrderMatcher balances and allowances
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await erc20TokenA.setBalance.sendTransactionAsync(orderMatcher.address, constants.INITIAL_ERC20_BALANCE, {
-                from: owner,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await erc20TokenB.setBalance.sendTransactionAsync(orderMatcher.address, constants.INITIAL_ERC20_BALANCE, {
-                from: owner,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await orderMatcher.approveAssetProxy.sendTransactionAsync(
-                leftMakerAssetData,
-                constants.INITIAL_ERC20_ALLOWANCE,
-            ),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-        await web3Wrapper.awaitTransactionSuccessAsync(
-            await orderMatcher.approveAssetProxy.sendTransactionAsync(
-                leftTakerAssetData,
-                constants.INITIAL_ERC20_ALLOWANCE,
-            ),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-        // Create default order parameters
-        const defaultOrderParamsLeft = {
-            ...constants.STATIC_ORDER_PARAMS,
-            makerAddress: makerAddressLeft,
-            exchangeAddress: exchange.address,
-            makerAssetData: leftMakerAssetData,
-            takerAssetData: leftTakerAssetData,
-            feeRecipientAddress: feeRecipientAddressLeft,
-            makerFee: constants.ZERO_AMOUNT,
-            takerFee: constants.ZERO_AMOUNT,
-        };
-        const defaultOrderParamsRight = {
-            ...constants.STATIC_ORDER_PARAMS,
-            makerAddress: makerAddressRight,
-            exchangeAddress: exchange.address,
-            makerAssetData: leftTakerAssetData,
-            takerAssetData: leftMakerAssetData,
-            feeRecipientAddress: feeRecipientAddressRight,
-            makerFee: constants.ZERO_AMOUNT,
-            takerFee: constants.ZERO_AMOUNT,
-        };
-        const privateKeyLeft = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddressLeft)];
-        orderFactoryLeft = new OrderFactory(privateKeyLeft, defaultOrderParamsLeft);
-        const privateKeyRight = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddressRight)];
-        orderFactoryRight = new OrderFactory(privateKeyRight, defaultOrderParamsRight);
-    });
-    beforeEach(async () => {
-        await blockchainLifecycle.startAsync();
-    });
-    afterEach(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-    describe('constructor', () => {
-        it('should revert if assetProxy is unregistered', async () => {
-            const exchangeInstance = await ExchangeContract.deployFrom0xArtifactAsync(
-                protocolArtifacts.Exchange,
-                provider,
-                txDefaults,
-                constants.NULL_BYTES,
-            );
-            return expectContractCreationFailedAsync(
-                (OrderMatcherContract.deployFrom0xArtifactAsync(
-                    artifacts.OrderMatcher,
-                    provider,
-                    txDefaults,
-                    exchangeInstance.address,
-                ) as any) as sendTransactionResult,
-                RevertReason.UnregisteredAssetProxy,
-            );
-        });
-    });
-    describe('matchOrders', () => {
-        beforeEach(async () => {
-            erc20BalancesByOwner = await erc20Wrapper.getBalancesAsync();
-        });
-        it('should revert if not called by owner', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
-            });
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await expectTransactionFailedAsync(
-                web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: takerAddress,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                RevertReason.OnlyContractOwner,
-            );
-        });
-        it('should transfer the correct amounts when orders completely fill each other', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
-            });
-            // Match signedOrderLeft with signedOrderRight
-            const expectedTransferAmounts = {
-                // Left Maker
-                amountSoldByLeftMaker: signedOrderLeft.makerAssetAmount,
-                amountBoughtByLeftMaker: signedOrderLeft.takerAssetAmount,
-                // Right Maker
-                amountSoldByRightMaker: signedOrderRight.makerAssetAmount,
-                amountBoughtByRightMaker: signedOrderRight.takerAssetAmount,
-                // Taker
-                leftMakerAssetSpreadAmount: signedOrderLeft.makerAssetAmount.minus(signedOrderRight.takerAssetAmount),
-            };
-            const initialLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const newLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const newErc20Balances = await erc20Wrapper.getBalancesAsync();
-            expect(newErc20Balances[makerAddressLeft][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20MakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20TakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByRightMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressLeft][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20TakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20MakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByRightMaker,
-                ),
-            );
-            expect(newLeftMakerAssetTakerBalance).to.be.bignumber.equal(
-                initialLeftMakerAssetTakerBalance.plus(expectedTransferAmounts.leftMakerAssetSpreadAmount),
-            );
-        });
-        it('should transfer the correct amounts when orders completely fill each other and taker doesnt take a profit', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-            });
-            // Match signedOrderLeft with signedOrderRight
-            const expectedTransferAmounts = {
-                // Left Maker
-                amountSoldByLeftMaker: signedOrderLeft.makerAssetAmount,
-                amountBoughtByLeftMaker: signedOrderLeft.takerAssetAmount,
-                // Right Maker
-                amountSoldByRightMaker: signedOrderRight.makerAssetAmount,
-                amountBoughtByRightMaker: signedOrderRight.takerAssetAmount,
-            };
-            const initialLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const newLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const newErc20Balances = await erc20Wrapper.getBalancesAsync();
-            expect(newErc20Balances[makerAddressLeft][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20MakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20TakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByRightMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressLeft][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20TakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20MakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByRightMaker,
-                ),
-            );
-            expect(newLeftMakerAssetTakerBalance).to.be.bignumber.equal(initialLeftMakerAssetTakerBalance);
-        });
-        it('should transfer the correct amounts when left order is completely filled and right order would be partially filled', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(20), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(4), 18),
-            });
-            // Match signedOrderLeft with signedOrderRight
-            const expectedTransferAmounts = {
-                // Left Maker
-                amountSoldByLeftMaker: signedOrderLeft.makerAssetAmount,
-                amountBoughtByLeftMaker: signedOrderLeft.takerAssetAmount,
-                // Right Maker
-                amountSoldByRightMaker: signedOrderRight.makerAssetAmount,
-                amountBoughtByRightMaker: signedOrderRight.takerAssetAmount,
-                // Taker
-                leftMakerAssetSpreadAmount: signedOrderLeft.makerAssetAmount.minus(signedOrderRight.takerAssetAmount),
-                leftTakerAssetSpreadAmount: signedOrderRight.makerAssetAmount.minus(signedOrderLeft.takerAssetAmount),
-            };
-            const initialLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const initialLeftTakerAssetTakerBalance = await erc20TokenB.balanceOf.callAsync(orderMatcher.address);
-            // Match signedOrderLeft with signedOrderRight
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const newLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const newLeftTakerAssetTakerBalance = await erc20TokenB.balanceOf.callAsync(orderMatcher.address);
-            const newErc20Balances = await erc20Wrapper.getBalancesAsync();
-            expect(newErc20Balances[makerAddressLeft][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20MakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20TakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByRightMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressLeft][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20TakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20MakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByRightMaker,
-                ),
-            );
-            expect(newLeftMakerAssetTakerBalance).to.be.bignumber.equal(
-                initialLeftMakerAssetTakerBalance.plus(expectedTransferAmounts.leftMakerAssetSpreadAmount),
-            );
-            expect(newLeftTakerAssetTakerBalance).to.be.bignumber.equal(
-                initialLeftTakerAssetTakerBalance.plus(expectedTransferAmounts.leftTakerAssetSpreadAmount),
-            );
-        });
-        it('should not call fillOrder when rightOrder is completely filled after matchOrders call and orders were never partially filled', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
-            });
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            const logDecoder = new LogDecoder(web3Wrapper, { ...artifacts, ...tokenArtifacts, ...protocolArtifacts });
-            const txReceipt = await logDecoder.getTxWithDecodedLogsAsync(
-                await web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-            );
-            const fillLogs = _.filter(
-                txReceipt.logs,
-                log => (log as LogWithDecodedArgs<ExchangeFillEventArgs>).event === 'Fill',
-            );
-            // Only 2 Fill logs should exist for `matchOrders` call. `fillOrder` should not have been called and should not have emitted a Fill event.
-            expect(fillLogs.length).to.be.equal(2);
-        });
-        it('should not call fillOrder when rightOrder is completely filled after matchOrders call and orders were initially partially filled', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(2), 18),
-            });
-            await exchangeWrapper.fillOrderAsync(signedOrderLeft, takerAddress, {
-                takerAssetFillAmount: signedOrderLeft.takerAssetAmount.dividedToIntegerBy(5),
-            });
-            await exchangeWrapper.fillOrderAsync(signedOrderRight, takerAddress, {
-                takerAssetFillAmount: signedOrderRight.takerAssetAmount.dividedToIntegerBy(5),
-            });
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            const logDecoder = new LogDecoder(web3Wrapper, { ...artifacts, ...tokenArtifacts, ...protocolArtifacts });
-            const txReceipt = await logDecoder.getTxWithDecodedLogsAsync(
-                await web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-            );
-            const fillLogs = _.filter(
-                txReceipt.logs,
-                log => (log as LogWithDecodedArgs<ExchangeFillEventArgs>).event === 'Fill',
-            );
-            // Only 2 Fill logs should exist for `matchOrders` call. `fillOrder` should not have been called and should not have emitted a Fill event.
-            expect(fillLogs.length).to.be.equal(2);
-        });
-        it('should only take a spread in rightMakerAsset if entire leftMakerAssetSpread amount can be used to fill rightOrder after matchOrders call', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(0.9), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(990), 18),
-            });
-            const initialLeftMakerAssetSpreadAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(1.09), 18);
-            const leftTakerAssetSpreadAmount = initialLeftMakerAssetSpreadAmount
-                .times(signedOrderRight.makerAssetAmount)
-                .dividedToIntegerBy(signedOrderRight.takerAssetAmount);
-            // Match signedOrderLeft with signedOrderRight
-            const expectedTransferAmounts = {
-                // Left Maker
-                amountSoldByLeftMaker: signedOrderLeft.makerAssetAmount,
-                amountBoughtByLeftMaker: signedOrderLeft.takerAssetAmount,
-                // Right Maker
-                amountSoldByRightMaker: signedOrderLeft.takerAssetAmount.plus(leftTakerAssetSpreadAmount),
-                amountBoughtByRightMaker: signedOrderLeft.makerAssetAmount,
-                // Taker
-                leftMakerAssetSpreadAmount: constants.ZERO_AMOUNT,
-                leftTakerAssetSpreadAmount,
-            };
-            const initialLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const initialLeftTakerAssetTakerBalance = await erc20TokenB.balanceOf.callAsync(orderMatcher.address);
-            // Match signedOrderLeft with signedOrderRight
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const newLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const newLeftTakerAssetTakerBalance = await erc20TokenB.balanceOf.callAsync(orderMatcher.address);
-            const newErc20Balances = await erc20Wrapper.getBalancesAsync();
-            expect(newErc20Balances[makerAddressLeft][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20MakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20TakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByRightMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressLeft][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20TakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20MakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByRightMaker,
-                ),
-            );
-            expect(newLeftMakerAssetTakerBalance).to.be.bignumber.equal(
-                initialLeftMakerAssetTakerBalance.plus(expectedTransferAmounts.leftMakerAssetSpreadAmount),
-            );
-            expect(newLeftTakerAssetTakerBalance).to.be.bignumber.equal(
-                initialLeftTakerAssetTakerBalance.plus(expectedTransferAmounts.leftTakerAssetSpreadAmount),
-            );
-        });
-        it("should succeed if rightOrder's makerAssetData and takerAssetData are not provided", async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(20), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(4), 18),
-            });
-            // Match signedOrderLeft with signedOrderRight
-            const expectedTransferAmounts = {
-                // Left Maker
-                amountSoldByLeftMaker: signedOrderLeft.makerAssetAmount,
-                amountBoughtByLeftMaker: signedOrderLeft.takerAssetAmount,
-                // Right Maker
-                amountSoldByRightMaker: signedOrderRight.makerAssetAmount,
-                amountBoughtByRightMaker: signedOrderRight.takerAssetAmount,
-                // Taker
-                leftMakerAssetSpreadAmount: signedOrderLeft.makerAssetAmount.minus(signedOrderRight.takerAssetAmount),
-                leftTakerAssetSpreadAmount: signedOrderRight.makerAssetAmount.minus(signedOrderLeft.takerAssetAmount),
-            };
-            const initialLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const initialLeftTakerAssetTakerBalance = await erc20TokenB.balanceOf.callAsync(orderMatcher.address);
-            // Match signedOrderLeft with signedOrderRight
-            signedOrderRight.makerAssetData = constants.NULL_BYTES;
-            signedOrderRight.takerAssetData = constants.NULL_BYTES;
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const newLeftMakerAssetTakerBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            const newLeftTakerAssetTakerBalance = await erc20TokenB.balanceOf.callAsync(orderMatcher.address);
-            const newErc20Balances = await erc20Wrapper.getBalancesAsync();
-            expect(newErc20Balances[makerAddressLeft][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20MakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20TakerAssetAddress].minus(
-                    expectedTransferAmounts.amountSoldByRightMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressLeft][defaultERC20TakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressLeft][defaultERC20TakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByLeftMaker,
-                ),
-            );
-            expect(newErc20Balances[makerAddressRight][defaultERC20MakerAssetAddress]).to.be.bignumber.equal(
-                erc20BalancesByOwner[makerAddressRight][defaultERC20MakerAssetAddress].plus(
-                    expectedTransferAmounts.amountBoughtByRightMaker,
-                ),
-            );
-            expect(newLeftMakerAssetTakerBalance).to.be.bignumber.equal(
-                initialLeftMakerAssetTakerBalance.plus(expectedTransferAmounts.leftMakerAssetSpreadAmount),
-            );
-            expect(newLeftTakerAssetTakerBalance).to.be.bignumber.equal(
-                initialLeftTakerAssetTakerBalance.plus(expectedTransferAmounts.leftTakerAssetSpreadAmount),
-            );
-        });
-        it('should revert with the correct reason if matchOrders call reverts', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-            });
-            signedOrderRight.signature = `0xff${signedOrderRight.signature.slice(4)}`;
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await expectTransactionFailedAsync(
-                web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                RevertReason.InvalidOrderSignature,
-            );
-        });
-        it('should revert with the correct reason if fillOrder call reverts', async () => {
-            // Create orders to match
-            const signedOrderLeft = await orderFactoryLeft.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(5), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(10), 18),
-            });
-            const signedOrderRight = await orderFactoryRight.newSignedOrderAsync({
-                makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(20), 18),
-                takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(4), 18),
-            });
-            // Matcher will not have enough allowance to fill rightOrder
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await orderMatcher.approveAssetProxy.sendTransactionAsync(leftMakerAssetData, constants.ZERO_AMOUNT, {
-                    from: owner,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const data = exchange.matchOrders.getABIEncodedTransactionData(
-                signedOrderLeft,
-                signedOrderRight,
-                signedOrderLeft.signature,
-                signedOrderRight.signature,
-            );
-            await expectTransactionFailedAsync(
-                web3Wrapper.sendTransactionAsync({
-                    data,
-                    to: orderMatcher.address,
-                    from: owner,
-                    gas: constants.MAX_MATCH_ORDERS_GAS,
-                }),
-                RevertReason.TransferFailed,
-            );
-        });
-    });
-    describe('withdrawAsset', () => {
-        it('should allow owner to withdraw ERC20 tokens', async () => {
-            const erc20AWithdrawAmount = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            expect(erc20AWithdrawAmount).to.be.bignumber.gt(constants.ZERO_AMOUNT);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await orderMatcher.withdrawAsset.sendTransactionAsync(leftMakerAssetData, erc20AWithdrawAmount, {
-                    from: owner,
-                }),
-            );
-            const newBalance = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            expect(newBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should allow owner to withdraw ERC721 tokens', async () => {
-            const erc721Token = await DummyERC721TokenContract.deployFrom0xArtifactAsync(
-                tokenArtifacts.DummyERC721Token,
-                provider,
-                txDefaults,
-                constants.DUMMY_TOKEN_NAME,
-                constants.DUMMY_TOKEN_SYMBOL,
-            );
-            const tokenId = new BigNumber(1);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.mint.sendTransactionAsync(orderMatcher.address, tokenId, { from: owner }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const assetData = assetDataUtils.encodeERC721AssetData(erc721Token.address, tokenId);
-            const withdrawAmount = new BigNumber(1);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await orderMatcher.withdrawAsset.sendTransactionAsync(assetData, withdrawAmount, { from: owner }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const erc721Owner = await erc721Token.ownerOf.callAsync(tokenId);
-            expect(erc721Owner).to.be.equal(owner);
-        });
-        it('should revert if not called by owner', async () => {
-            const erc20AWithdrawAmount = await erc20TokenA.balanceOf.callAsync(orderMatcher.address);
-            expect(erc20AWithdrawAmount).to.be.bignumber.gt(constants.ZERO_AMOUNT);
-            await expectTransactionFailedAsync(
-                orderMatcher.withdrawAsset.sendTransactionAsync(leftMakerAssetData, erc20AWithdrawAmount, {
-                    from: takerAddress,
-                }),
-                RevertReason.OnlyContractOwner,
-            );
-        });
-    });
-    describe('approveAssetProxy', () => {
-        it('should be able to set an allowance for ERC20 tokens', async () => {
-            const allowance = new BigNumber(55465465426546);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await orderMatcher.approveAssetProxy.sendTransactionAsync(leftMakerAssetData, allowance, {
-                    from: owner,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const newAllowance = await erc20TokenA.allowance.callAsync(orderMatcher.address, erc20Proxy.address);
-            expect(newAllowance).to.be.bignumber.equal(allowance);
-        });
-        it('should be able to approve an ERC721 token by passing in allowance = 1', async () => {
-            const erc721Token = await DummyERC721TokenContract.deployFrom0xArtifactAsync(
-                tokenArtifacts.DummyERC721Token,
-                provider,
-                txDefaults,
-                constants.DUMMY_TOKEN_NAME,
-                constants.DUMMY_TOKEN_SYMBOL,
-            );
-            const assetData = assetDataUtils.encodeERC721AssetData(erc721Token.address, constants.ZERO_AMOUNT);
-            const allowance = new BigNumber(1);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await orderMatcher.approveAssetProxy.sendTransactionAsync(assetData, allowance, { from: owner }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const isApproved = await erc721Token.isApprovedForAll.callAsync(orderMatcher.address, erc721Proxy.address);
-            expect(isApproved).to.be.equal(true);
-        });
-        it('should be able to approve an ERC721 token by passing in allowance > 1', async () => {
-            const erc721Token = await DummyERC721TokenContract.deployFrom0xArtifactAsync(
-                tokenArtifacts.DummyERC721Token,
-                provider,
-                txDefaults,
-                constants.DUMMY_TOKEN_NAME,
-                constants.DUMMY_TOKEN_SYMBOL,
-            );
-            const assetData = assetDataUtils.encodeERC721AssetData(erc721Token.address, constants.ZERO_AMOUNT);
-            const allowance = new BigNumber(2);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await orderMatcher.approveAssetProxy.sendTransactionAsync(assetData, allowance, { from: owner }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const isApproved = await erc721Token.isApprovedForAll.callAsync(orderMatcher.address, erc721Proxy.address);
-            expect(isApproved).to.be.equal(true);
-        });
-        it('should revert if not called by owner', async () => {
-            const approval = new BigNumber(1);
-            await expectTransactionFailedAsync(
-                orderMatcher.approveAssetProxy.sendTransactionAsync(leftMakerAssetData, approval, {
-                    from: takerAddress,
-                }),
-                RevertReason.OnlyContractOwner,
-            );
-        });
-    });
-});
-// tslint:disable:max-file-line-count
-// tslint:enable:no-unnecessary-type-assertion
diff --git a/contracts/extensions/test/extensions/order_validator.ts b/contracts/extensions/test/extensions/order_validator.ts
deleted file mode 100644
index 7d8675f36..000000000
--- a/contracts/extensions/test/extensions/order_validator.ts
+++ /dev/null
@@ -1,609 +0,0 @@
-import {
-    artifacts as protocolArtifacts,
-    ERC20ProxyContract,
-    ERC20Wrapper,
-    ERC721ProxyContract,
-    ERC721Wrapper,
-    ExchangeContract,
-    ExchangeWrapper,
-} from '@0x/contracts-protocol';
-import {
-    chaiSetup,
-    constants,
-    OrderFactory,
-    OrderStatus,
-    provider,
-    txDefaults,
-    web3Wrapper,
-} from '@0x/contracts-test-utils';
-import { DummyERC20TokenContract, DummyERC721TokenContract } from '@0x/contracts-tokens';
-import { BlockchainLifecycle } from '@0x/dev-utils';
-import { assetDataUtils, orderHashUtils } from '@0x/order-utils';
-import { SignedOrder } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-import * as chai from 'chai';
-import * as _ from 'lodash';
-
-import { OrderValidatorContract } from '../../generated-wrappers/order_validator';
-import { artifacts } from '../../src/artifacts/index';
-
-chaiSetup.configure();
-const expect = chai.expect;
-const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-
-describe('OrderValidator', () => {
-    let makerAddress: string;
-    let owner: string;
-    let takerAddress: string;
-    let erc20AssetData: string;
-    let erc721AssetData: string;
-
-    let erc20Token: DummyERC20TokenContract;
-    let zrxToken: DummyERC20TokenContract;
-    let erc721Token: DummyERC721TokenContract;
-    let exchange: ExchangeContract;
-    let orderValidator: OrderValidatorContract;
-    let erc20Proxy: ERC20ProxyContract;
-    let erc721Proxy: ERC721ProxyContract;
-
-    let signedOrder: SignedOrder;
-    let signedOrder2: SignedOrder;
-    let orderFactory: OrderFactory;
-
-    const tokenId = new BigNumber(123456789);
-    const tokenId2 = new BigNumber(987654321);
-    const ERC721_BALANCE = new BigNumber(1);
-    const ERC721_ALLOWANCE = new BigNumber(1);
-
-    before(async () => {
-        await blockchainLifecycle.startAsync();
-    });
-    after(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-
-    before(async () => {
-        const accounts = await web3Wrapper.getAvailableAddressesAsync();
-        const usedAddresses = ([owner, makerAddress, takerAddress] = _.slice(accounts, 0, 3));
-
-        const erc20Wrapper = new ERC20Wrapper(provider, usedAddresses, owner);
-        const erc721Wrapper = new ERC721Wrapper(provider, usedAddresses, owner);
-
-        const numDummyErc20ToDeploy = 2;
-        [erc20Token, zrxToken] = await erc20Wrapper.deployDummyTokensAsync(
-            numDummyErc20ToDeploy,
-            constants.DUMMY_TOKEN_DECIMALS,
-        );
-        erc20Proxy = await erc20Wrapper.deployProxyAsync();
-
-        [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
-        erc721Proxy = await erc721Wrapper.deployProxyAsync();
-
-        const zrxAssetData = assetDataUtils.encodeERC20AssetData(zrxToken.address);
-        exchange = await ExchangeContract.deployFrom0xArtifactAsync(
-            protocolArtifacts.Exchange,
-            provider,
-            txDefaults,
-            zrxAssetData,
-        );
-        const exchangeWrapper = new ExchangeWrapper(exchange, provider);
-        await exchangeWrapper.registerAssetProxyAsync(erc20Proxy.address, owner);
-        await exchangeWrapper.registerAssetProxyAsync(erc721Proxy.address, owner);
-
-        orderValidator = await OrderValidatorContract.deployFrom0xArtifactAsync(
-            artifacts.OrderValidator,
-            provider,
-            txDefaults,
-            exchange.address,
-            zrxAssetData,
-        );
-
-        erc20AssetData = assetDataUtils.encodeERC20AssetData(erc20Token.address);
-        erc721AssetData = assetDataUtils.encodeERC721AssetData(erc721Token.address, tokenId);
-        const defaultOrderParams = {
-            ...constants.STATIC_ORDER_PARAMS,
-            exchangeAddress: exchange.address,
-            makerAddress,
-            feeRecipientAddress: constants.NULL_ADDRESS,
-            makerAssetData: erc20AssetData,
-            takerAssetData: erc721AssetData,
-        };
-        const privateKey = constants.TESTRPC_PRIVATE_KEYS[accounts.indexOf(makerAddress)];
-        orderFactory = new OrderFactory(privateKey, defaultOrderParams);
-    });
-
-    beforeEach(async () => {
-        await blockchainLifecycle.startAsync();
-    });
-    afterEach(async () => {
-        await blockchainLifecycle.revertAsync();
-    });
-
-    describe('getBalanceAndAllowance', () => {
-        describe('getERC721TokenOwner', async () => {
-            it('should return the null address when tokenId is not owned', async () => {
-                const tokenOwner = await orderValidator.getERC721TokenOwner.callAsync(makerAddress, tokenId);
-                expect(tokenOwner).to.be.equal(constants.NULL_ADDRESS);
-            });
-            it('should return the owner address when tokenId is owned', async () => {
-                await web3Wrapper.awaitTransactionSuccessAsync(
-                    await erc721Token.mint.sendTransactionAsync(makerAddress, tokenId),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                const tokenOwner = await orderValidator.getERC721TokenOwner.callAsync(erc721Token.address, tokenId);
-                expect(tokenOwner).to.be.equal(makerAddress);
-            });
-        });
-        describe('ERC20 assetData', () => {
-            it('should return the correct balances and allowances when both values are 0', async () => {
-                const [newBalance, newAllowance] = await orderValidator.getBalanceAndAllowance.callAsync(
-                    makerAddress,
-                    erc20AssetData,
-                );
-                expect(constants.ZERO_AMOUNT).to.be.bignumber.equal(newBalance);
-                expect(constants.ZERO_AMOUNT).to.be.bignumber.equal(newAllowance);
-            });
-            it('should return the correct balance and allowance when both values are non-zero', async () => {
-                const balance = new BigNumber(123);
-                const allowance = new BigNumber(456);
-                await web3Wrapper.awaitTransactionSuccessAsync(
-                    await erc20Token.setBalance.sendTransactionAsync(makerAddress, balance),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                await web3Wrapper.awaitTransactionSuccessAsync(
-                    await erc20Token.approve.sendTransactionAsync(erc20Proxy.address, allowance, {
-                        from: makerAddress,
-                    }),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                const [newBalance, newAllowance] = await orderValidator.getBalanceAndAllowance.callAsync(
-                    makerAddress,
-                    erc20AssetData,
-                );
-                expect(balance).to.be.bignumber.equal(newBalance);
-                expect(allowance).to.be.bignumber.equal(newAllowance);
-            });
-        });
-        describe('ERC721 assetData', () => {
-            it('should return a balance of 0 when the tokenId is not owned by target', async () => {
-                const [newBalance] = await orderValidator.getBalanceAndAllowance.callAsync(
-                    makerAddress,
-                    erc721AssetData,
-                );
-                expect(newBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            });
-            it('should return an allowance of 0 when no approval is set', async () => {
-                const [, newAllowance] = await orderValidator.getBalanceAndAllowance.callAsync(
-                    makerAddress,
-                    erc721AssetData,
-                );
-                expect(newAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            });
-            it('should return a balance of 1 when the tokenId is owned by target', async () => {
-                await web3Wrapper.awaitTransactionSuccessAsync(
-                    await erc721Token.mint.sendTransactionAsync(makerAddress, tokenId),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                const [newBalance] = await orderValidator.getBalanceAndAllowance.callAsync(
-                    makerAddress,
-                    erc721AssetData,
-                );
-                expect(newBalance).to.be.bignumber.equal(ERC721_BALANCE);
-            });
-            it('should return an allowance of 1 when ERC721Proxy is approved for all', async () => {
-                const isApproved = true;
-                await web3Wrapper.awaitTransactionSuccessAsync(
-                    await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, isApproved, {
-                        from: makerAddress,
-                    }),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                const [, newAllowance] = await orderValidator.getBalanceAndAllowance.callAsync(
-                    makerAddress,
-                    erc721AssetData,
-                );
-                expect(newAllowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-            });
-            it('should return an allowance of 0 when ERC721Proxy is approved for specific tokenId', async () => {
-                await web3Wrapper.awaitTransactionSuccessAsync(
-                    await erc721Token.mint.sendTransactionAsync(makerAddress, tokenId),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                await web3Wrapper.awaitTransactionSuccessAsync(
-                    await erc721Token.approve.sendTransactionAsync(erc721Proxy.address, tokenId, {
-                        from: makerAddress,
-                    }),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                const [, newAllowance] = await orderValidator.getBalanceAndAllowance.callAsync(
-                    makerAddress,
-                    erc721AssetData,
-                );
-                expect(newAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            });
-        });
-    });
-    describe('getBalancesAndAllowances', () => {
-        it('should return the correct balances and allowances when all values are 0', async () => {
-            const [
-                [erc20Balance, erc721Balance],
-                [erc20Allowance, erc721Allowance],
-            ] = await orderValidator.getBalancesAndAllowances.callAsync(makerAddress, [
-                erc20AssetData,
-                erc721AssetData,
-            ]);
-            expect(erc20Balance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(erc721Balance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(erc20Allowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(erc721Allowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should return the correct balances and allowances when balances and allowances are non-zero', async () => {
-            const balance = new BigNumber(123);
-            const allowance = new BigNumber(456);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.setBalance.sendTransactionAsync(makerAddress, balance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.approve.sendTransactionAsync(erc20Proxy.address, allowance, {
-                    from: makerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.mint.sendTransactionAsync(makerAddress, tokenId),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const isApproved = true;
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, isApproved, {
-                    from: makerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const [
-                [erc20Balance, erc721Balance],
-                [erc20Allowance, erc721Allowance],
-            ] = await orderValidator.getBalancesAndAllowances.callAsync(makerAddress, [
-                erc20AssetData,
-                erc721AssetData,
-            ]);
-            expect(erc20Balance).to.be.bignumber.equal(balance);
-            expect(erc721Balance).to.be.bignumber.equal(ERC721_BALANCE);
-            expect(erc20Allowance).to.be.bignumber.equal(allowance);
-            expect(erc721Allowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-        });
-    });
-    describe('getTraderInfo', () => {
-        beforeEach(async () => {
-            signedOrder = await orderFactory.newSignedOrderAsync();
-        });
-        it('should return the correct info when no balances or allowances are set', async () => {
-            const traderInfo = await orderValidator.getTraderInfo.callAsync(signedOrder, takerAddress);
-            expect(traderInfo.makerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should return the correct info when balances and allowances are set', async () => {
-            const makerBalance = new BigNumber(123);
-            const makerAllowance = new BigNumber(456);
-            const makerZrxBalance = new BigNumber(789);
-            const takerZrxAllowance = new BigNumber(987);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.setBalance.sendTransactionAsync(makerAddress, makerBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.approve.sendTransactionAsync(erc20Proxy.address, makerAllowance, {
-                    from: makerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.setBalance.sendTransactionAsync(makerAddress, makerZrxBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.approve.sendTransactionAsync(erc20Proxy.address, takerZrxAllowance, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.mint.sendTransactionAsync(takerAddress, tokenId),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const isApproved = true;
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, isApproved, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const traderInfo = await orderValidator.getTraderInfo.callAsync(signedOrder, takerAddress);
-            expect(traderInfo.makerBalance).to.be.bignumber.equal(makerBalance);
-            expect(traderInfo.makerAllowance).to.be.bignumber.equal(makerAllowance);
-            expect(traderInfo.takerBalance).to.be.bignumber.equal(ERC721_BALANCE);
-            expect(traderInfo.takerAllowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-            expect(traderInfo.makerZrxBalance).to.be.bignumber.equal(makerZrxBalance);
-            expect(traderInfo.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxAllowance).to.be.bignumber.equal(takerZrxAllowance);
-        });
-    });
-    describe('getTradersInfo', () => {
-        beforeEach(async () => {
-            signedOrder = await orderFactory.newSignedOrderAsync();
-            signedOrder2 = await orderFactory.newSignedOrderAsync({
-                takerAssetData: assetDataUtils.encodeERC721AssetData(erc721Token.address, tokenId2),
-            });
-        });
-        it('should return the correct info when no balances or allowances have been set', async () => {
-            const orders = [signedOrder, signedOrder2];
-            const takers = [takerAddress, takerAddress];
-            const [traderInfo1, traderInfo2] = await orderValidator.getTradersInfo.callAsync(orders, takers);
-            expect(traderInfo1.makerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should return the correct info when balances and allowances are set', async () => {
-            const makerBalance = new BigNumber(123);
-            const makerAllowance = new BigNumber(456);
-            const makerZrxBalance = new BigNumber(789);
-            const takerZrxAllowance = new BigNumber(987);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.setBalance.sendTransactionAsync(makerAddress, makerBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.approve.sendTransactionAsync(erc20Proxy.address, makerAllowance, {
-                    from: makerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.setBalance.sendTransactionAsync(makerAddress, makerZrxBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.approve.sendTransactionAsync(erc20Proxy.address, takerZrxAllowance, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const isApproved = true;
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, isApproved, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.mint.sendTransactionAsync(takerAddress, tokenId2),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const orders = [signedOrder, signedOrder2];
-            const takers = [takerAddress, takerAddress];
-            const [traderInfo1, traderInfo2] = await orderValidator.getTradersInfo.callAsync(orders, takers);
-
-            expect(traderInfo1.makerBalance).to.be.bignumber.equal(makerBalance);
-            expect(traderInfo1.makerAllowance).to.be.bignumber.equal(makerAllowance);
-            expect(traderInfo1.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerAllowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-            expect(traderInfo1.makerZrxBalance).to.be.bignumber.equal(makerZrxBalance);
-            expect(traderInfo1.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxAllowance).to.be.bignumber.equal(takerZrxAllowance);
-            expect(traderInfo2.makerBalance).to.be.bignumber.equal(makerBalance);
-            expect(traderInfo2.makerAllowance).to.be.bignumber.equal(makerAllowance);
-            expect(traderInfo2.takerBalance).to.be.bignumber.equal(ERC721_BALANCE);
-            expect(traderInfo2.takerAllowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-            expect(traderInfo2.makerZrxBalance).to.be.bignumber.equal(makerZrxBalance);
-            expect(traderInfo2.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxAllowance).to.be.bignumber.equal(takerZrxAllowance);
-        });
-    });
-    describe('getOrderAndTraderInfo', () => {
-        beforeEach(async () => {
-            signedOrder = await orderFactory.newSignedOrderAsync();
-        });
-        it('should return the correct info when no balances or allowances are set', async () => {
-            const [orderInfo, traderInfo] = await orderValidator.getOrderAndTraderInfo.callAsync(
-                signedOrder,
-                takerAddress,
-            );
-            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
-            expect(orderInfo.orderStatus).to.be.equal(OrderStatus.Fillable);
-            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
-            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should return the correct info when balances and allowances are set', async () => {
-            const makerBalance = new BigNumber(123);
-            const makerAllowance = new BigNumber(456);
-            const makerZrxBalance = new BigNumber(789);
-            const takerZrxAllowance = new BigNumber(987);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.setBalance.sendTransactionAsync(makerAddress, makerBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.approve.sendTransactionAsync(erc20Proxy.address, makerAllowance, {
-                    from: makerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.setBalance.sendTransactionAsync(makerAddress, makerZrxBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.approve.sendTransactionAsync(erc20Proxy.address, takerZrxAllowance, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.mint.sendTransactionAsync(takerAddress, tokenId),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const isApproved = true;
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, isApproved, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const [orderInfo, traderInfo] = await orderValidator.getOrderAndTraderInfo.callAsync(
-                signedOrder,
-                takerAddress,
-            );
-            const expectedOrderHash = orderHashUtils.getOrderHashHex(signedOrder);
-            expect(orderInfo.orderStatus).to.be.equal(OrderStatus.Fillable);
-            expect(orderInfo.orderHash).to.be.equal(expectedOrderHash);
-            expect(orderInfo.orderTakerAssetFilledAmount).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.makerBalance).to.be.bignumber.equal(makerBalance);
-            expect(traderInfo.makerAllowance).to.be.bignumber.equal(makerAllowance);
-            expect(traderInfo.takerBalance).to.be.bignumber.equal(ERC721_BALANCE);
-            expect(traderInfo.takerAllowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-            expect(traderInfo.makerZrxBalance).to.be.bignumber.equal(makerZrxBalance);
-            expect(traderInfo.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo.takerZrxAllowance).to.be.bignumber.equal(takerZrxAllowance);
-        });
-    });
-    describe('getOrdersAndTradersInfo', () => {
-        beforeEach(async () => {
-            signedOrder = await orderFactory.newSignedOrderAsync();
-            signedOrder2 = await orderFactory.newSignedOrderAsync({
-                takerAssetData: assetDataUtils.encodeERC721AssetData(erc721Token.address, tokenId2),
-            });
-        });
-        it('should return the correct info when no balances or allowances have been set', async () => {
-            const orders = [signedOrder, signedOrder2];
-            const takers = [takerAddress, takerAddress];
-            const [
-                [orderInfo1, orderInfo2],
-                [traderInfo1, traderInfo2],
-            ] = await orderValidator.getOrdersAndTradersInfo.callAsync(orders, takers);
-            const expectedOrderHash1 = orderHashUtils.getOrderHashHex(signedOrder);
-            const expectedOrderHash2 = orderHashUtils.getOrderHashHex(signedOrder2);
-            expect(orderInfo1.orderStatus).to.be.equal(OrderStatus.Fillable);
-            expect(orderInfo1.orderHash).to.be.equal(expectedOrderHash1);
-            expect(orderInfo1.orderTakerAssetFilledAmount).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(orderInfo2.orderStatus).to.be.equal(OrderStatus.Fillable);
-            expect(orderInfo2.orderHash).to.be.equal(expectedOrderHash2);
-            expect(orderInfo2.orderTakerAssetFilledAmount).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-        });
-        it('should return the correct info when balances and allowances are set', async () => {
-            const makerBalance = new BigNumber(123);
-            const makerAllowance = new BigNumber(456);
-            const makerZrxBalance = new BigNumber(789);
-            const takerZrxAllowance = new BigNumber(987);
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.setBalance.sendTransactionAsync(makerAddress, makerBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc20Token.approve.sendTransactionAsync(erc20Proxy.address, makerAllowance, {
-                    from: makerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.setBalance.sendTransactionAsync(makerAddress, makerZrxBalance),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await zrxToken.approve.sendTransactionAsync(erc20Proxy.address, takerZrxAllowance, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const isApproved = true;
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.setApprovalForAll.sendTransactionAsync(erc721Proxy.address, isApproved, {
-                    from: takerAddress,
-                }),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            await web3Wrapper.awaitTransactionSuccessAsync(
-                await erc721Token.mint.sendTransactionAsync(takerAddress, tokenId2),
-                constants.AWAIT_TRANSACTION_MINED_MS,
-            );
-            const orders = [signedOrder, signedOrder2];
-            const takers = [takerAddress, takerAddress];
-            const [
-                [orderInfo1, orderInfo2],
-                [traderInfo1, traderInfo2],
-            ] = await orderValidator.getOrdersAndTradersInfo.callAsync(orders, takers);
-            const expectedOrderHash1 = orderHashUtils.getOrderHashHex(signedOrder);
-            const expectedOrderHash2 = orderHashUtils.getOrderHashHex(signedOrder2);
-            expect(orderInfo1.orderStatus).to.be.equal(OrderStatus.Fillable);
-            expect(orderInfo1.orderHash).to.be.equal(expectedOrderHash1);
-            expect(orderInfo1.orderTakerAssetFilledAmount).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(orderInfo2.orderStatus).to.be.equal(OrderStatus.Fillable);
-            expect(orderInfo2.orderHash).to.be.equal(expectedOrderHash2);
-            expect(orderInfo2.orderTakerAssetFilledAmount).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.makerBalance).to.be.bignumber.equal(makerBalance);
-            expect(traderInfo1.makerAllowance).to.be.bignumber.equal(makerAllowance);
-            expect(traderInfo1.takerBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerAllowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-            expect(traderInfo1.makerZrxBalance).to.be.bignumber.equal(makerZrxBalance);
-            expect(traderInfo1.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo1.takerZrxAllowance).to.be.bignumber.equal(takerZrxAllowance);
-            expect(traderInfo2.makerBalance).to.be.bignumber.equal(makerBalance);
-            expect(traderInfo2.makerAllowance).to.be.bignumber.equal(makerAllowance);
-            expect(traderInfo2.takerBalance).to.be.bignumber.equal(ERC721_BALANCE);
-            expect(traderInfo2.takerAllowance).to.be.bignumber.equal(ERC721_ALLOWANCE);
-            expect(traderInfo2.makerZrxBalance).to.be.bignumber.equal(makerZrxBalance);
-            expect(traderInfo2.makerZrxAllowance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxBalance).to.be.bignumber.equal(constants.ZERO_AMOUNT);
-            expect(traderInfo2.takerZrxAllowance).to.be.bignumber.equal(takerZrxAllowance);
-        });
-    });
-});
-// tslint:disable:max-file-line-count
diff --git a/contracts/extensions/test/global_hooks.ts b/contracts/extensions/test/global_hooks.ts
deleted file mode 100644
index f8ace376a..000000000
--- a/contracts/extensions/test/global_hooks.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { env, EnvVars } from '@0x/dev-utils';
-
-import { coverage, profiler, provider } from '@0x/contracts-test-utils';
-before('start web3 provider', () => {
-    provider.start();
-});
-after('generate coverage report', async () => {
-    if (env.parseBoolean(EnvVars.SolidityCoverage)) {
-        const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
-        await coverageSubprovider.writeCoverageAsync();
-    }
-    if (env.parseBoolean(EnvVars.SolidityProfiler)) {
-        const profilerSubprovider = profiler.getProfilerSubproviderSingleton();
-        await profilerSubprovider.writeProfilerOutputAsync();
-    }
-    provider.stop();
-});
diff --git a/contracts/extensions/test/utils/balance_threshold_wrapper.ts b/contracts/extensions/test/utils/balance_threshold_wrapper.ts
deleted file mode 100644
index 28a4ef011..000000000
--- a/contracts/extensions/test/utils/balance_threshold_wrapper.ts
+++ /dev/null
@@ -1,283 +0,0 @@
-import { artifacts as protocolArtifacts, ExchangeContract } from '@0x/contracts-protocol';
-import {
-    FillResults,
-    formatters,
-    LogDecoder,
-    OrderInfo,
-    orderUtils,
-    TransactionFactory,
-} from '@0x/contracts-test-utils';
-import { artifacts as tokensArtifacts } from '@0x/contracts-tokens';
-import { SignedOrder } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import { Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { BalanceThresholdFilterContract } from '../../generated-wrappers/balance_threshold_filter';
-import { artifacts } from '../../src/artifacts';
-
-export class BalanceThresholdWrapper {
-    private readonly _balanceThresholdFilter: BalanceThresholdFilterContract;
-    private readonly _signerTransactionFactory: TransactionFactory;
-    private readonly _exchange: ExchangeContract;
-    private readonly _web3Wrapper: Web3Wrapper;
-    private readonly _logDecoder: LogDecoder;
-    constructor(
-        balanceThresholdFilter: BalanceThresholdFilterContract,
-        exchangeContract: ExchangeContract,
-        signerTransactionFactory: TransactionFactory,
-        provider: Provider,
-    ) {
-        this._balanceThresholdFilter = balanceThresholdFilter;
-        this._exchange = exchangeContract;
-        this._signerTransactionFactory = signerTransactionFactory;
-        this._web3Wrapper = new Web3Wrapper(provider);
-        this._logDecoder = new LogDecoder(this._web3Wrapper, {
-            ...artifacts,
-            ...tokensArtifacts,
-            ...protocolArtifacts,
-        });
-    }
-    public async fillOrderAsync(
-        signedOrder: SignedOrder,
-        from: string,
-        opts: { takerAssetFillAmount?: BigNumber } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const data = this._exchange.fillOrder.getABIEncodedTransactionData(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async fillOrKillOrderAsync(
-        signedOrder: SignedOrder,
-        from: string,
-        opts: { takerAssetFillAmount?: BigNumber } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const data = this._exchange.fillOrKillOrder.getABIEncodedTransactionData(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async fillOrderNoThrowAsync(
-        signedOrder: SignedOrder,
-        from: string,
-        opts: { takerAssetFillAmount?: BigNumber; gas?: number } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const data = this._exchange.fillOrderNoThrow.getABIEncodedTransactionData(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from, opts.gas);
-        return txReceipt;
-    }
-    public async batchFillOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmounts?: BigNumber[] } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchFill(orders, opts.takerAssetFillAmounts);
-        const data = this._exchange.batchFillOrders.getABIEncodedTransactionData(
-            params.orders,
-            params.takerAssetFillAmounts,
-            params.signatures,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async batchFillOrKillOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmounts?: BigNumber[] } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchFill(orders, opts.takerAssetFillAmounts);
-        const data = this._exchange.batchFillOrKillOrders.getABIEncodedTransactionData(
-            params.orders,
-            params.takerAssetFillAmounts,
-            params.signatures,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async batchFillOrdersNoThrowAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmounts?: BigNumber[]; gas?: number } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchFill(orders, opts.takerAssetFillAmounts);
-        const data = this._exchange.batchFillOrKillOrders.getABIEncodedTransactionData(
-            params.orders,
-            params.takerAssetFillAmounts,
-            params.signatures,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from, opts.gas);
-        return txReceipt;
-    }
-    public async marketSellOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmount: BigNumber },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketSellOrders(orders, opts.takerAssetFillAmount);
-        const data = this._exchange.marketSellOrders.getABIEncodedTransactionData(
-            params.orders,
-            params.takerAssetFillAmount,
-            params.signatures,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async marketSellOrdersNoThrowAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmount: BigNumber; gas?: number },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketSellOrders(orders, opts.takerAssetFillAmount);
-        const data = this._exchange.marketSellOrdersNoThrow.getABIEncodedTransactionData(
-            params.orders,
-            params.takerAssetFillAmount,
-            params.signatures,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from, opts.gas);
-        return txReceipt;
-    }
-    public async marketBuyOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { makerAssetFillAmount: BigNumber },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketBuyOrders(orders, opts.makerAssetFillAmount);
-        const data = this._exchange.marketBuyOrders.getABIEncodedTransactionData(
-            params.orders,
-            params.makerAssetFillAmount,
-            params.signatures,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async marketBuyOrdersNoThrowAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { makerAssetFillAmount: BigNumber; gas?: number },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketBuyOrders(orders, opts.makerAssetFillAmount);
-        const data = this._exchange.marketBuyOrdersNoThrow.getABIEncodedTransactionData(
-            params.orders,
-            params.makerAssetFillAmount,
-            params.signatures,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from, opts.gas);
-        return txReceipt;
-    }
-    public async cancelOrderAsync(signedOrder: SignedOrder, from: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createCancel(signedOrder);
-        const data = this._exchange.cancelOrder.getABIEncodedTransactionData(params.order);
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async batchCancelOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchCancel(orders);
-        const data = this._exchange.batchCancelOrders.getABIEncodedTransactionData(params.orders);
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async cancelOrdersUpToAsync(salt: BigNumber, from: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const data = this._exchange.cancelOrdersUpTo.getABIEncodedTransactionData(salt);
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async getTakerAssetFilledAmountAsync(orderHashHex: string): Promise<BigNumber> {
-        const filledAmount = await this._exchange.filled.callAsync(orderHashHex);
-        return filledAmount;
-    }
-    public async isCancelledAsync(orderHashHex: string): Promise<boolean> {
-        const isCancelled = await this._exchange.cancelled.callAsync(orderHashHex);
-        return isCancelled;
-    }
-    public async getOrderEpochAsync(makerAddress: string, senderAddress: string): Promise<BigNumber> {
-        const orderEpoch = await this._exchange.orderEpoch.callAsync(makerAddress, senderAddress);
-        return orderEpoch;
-    }
-    public async getOrderInfoAsync(signedOrder: SignedOrder): Promise<OrderInfo> {
-        const orderInfo = await this._exchange.getOrderInfo.callAsync(signedOrder);
-        return orderInfo;
-    }
-    public async getOrdersInfoAsync(signedOrders: SignedOrder[]): Promise<OrderInfo[]> {
-        const ordersInfo = (await this._exchange.getOrdersInfo.callAsync(signedOrders)) as OrderInfo[];
-        return ordersInfo;
-    }
-    public async matchOrdersAsync(
-        signedOrderLeft: SignedOrder,
-        signedOrderRight: SignedOrder,
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createMatchOrders(signedOrderLeft, signedOrderRight);
-        const data = await this._exchange.matchOrders.getABIEncodedTransactionData(
-            params.left,
-            params.right,
-            params.leftSignature,
-            params.rightSignature,
-        );
-        const txReceipt = this._executeTransactionAsync(data, from);
-        return txReceipt;
-    }
-    public async getFillOrderResultsAsync(
-        signedOrder: SignedOrder,
-        from: string,
-        opts: { takerAssetFillAmount?: BigNumber } = {},
-    ): Promise<FillResults> {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const fillResults = await this._exchange.fillOrder.callAsync(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-            { from },
-        );
-        return fillResults;
-    }
-    public abiEncodeFillOrder(signedOrder: SignedOrder, opts: { takerAssetFillAmount?: BigNumber } = {}): string {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const data = this._exchange.fillOrder.getABIEncodedTransactionData(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-        );
-        return data;
-    }
-    public getBalanceThresholdAddress(): string {
-        return this._balanceThresholdFilter.address;
-    }
-    public getExchangeAddress(): string {
-        return this._exchange.address;
-    }
-    private async _executeTransactionAsync(
-        abiEncodedExchangeTxData: string,
-        from: string,
-        gas?: number,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const signedExchangeTx = this._signerTransactionFactory.newSignedTransaction(abiEncodedExchangeTxData);
-        const txOpts = _.isUndefined(gas) ? { from } : { from, gas };
-        const txHash = await this._balanceThresholdFilter.executeTransaction.sendTransactionAsync(
-            signedExchangeTx.salt,
-            signedExchangeTx.signerAddress,
-            signedExchangeTx.data,
-            signedExchangeTx.signature,
-            txOpts,
-        );
-        const txReceipt = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return txReceipt;
-    }
-}
diff --git a/contracts/extensions/test/utils/dutch_auction_test_wrapper.ts b/contracts/extensions/test/utils/dutch_auction_test_wrapper.ts
deleted file mode 100644
index c1e2f2070..000000000
--- a/contracts/extensions/test/utils/dutch_auction_test_wrapper.ts
+++ /dev/null
@@ -1,62 +0,0 @@
-import { artifacts as protocolArtifacts } from '@0x/contracts-protocol';
-import { LogDecoder } from '@0x/contracts-test-utils';
-import { artifacts as tokensArtifacts } from '@0x/contracts-tokens';
-import { DutchAuctionDetails, SignedOrder } from '@0x/types';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import { Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { DutchAuctionContract } from '../../generated-wrappers/dutch_auction';
-import { artifacts } from '../../src/artifacts';
-
-export class DutchAuctionTestWrapper {
-    private readonly _dutchAuctionContract: DutchAuctionContract;
-    private readonly _web3Wrapper: Web3Wrapper;
-    private readonly _logDecoder: LogDecoder;
-
-    constructor(contractInstance: DutchAuctionContract, provider: Provider) {
-        this._dutchAuctionContract = contractInstance;
-        this._web3Wrapper = new Web3Wrapper(provider);
-        this._logDecoder = new LogDecoder(this._web3Wrapper, {
-            ...artifacts,
-            ...tokensArtifacts,
-            ...protocolArtifacts,
-        });
-    }
-    /**
-     * Matches the buy and sell orders at an amount given the following: the current block time, the auction
-     * start time and the auction begin amount. The sell order is a an order at the lowest amount
-     * at the end of the auction. Excess from the match is transferred to the seller.
-     * Over time the price moves from beginAmount to endAmount given the current block.timestamp.
-     * @param buyOrder The Buyer's order. This order is for the current expected price of the auction.
-     * @param sellOrder The Seller's order. This order is for the lowest amount (at the end of the auction).
-     * @param from Address the transaction is being sent from.
-     * @return Transaction receipt with decoded logs.
-     */
-    public async matchOrdersAsync(
-        buyOrder: SignedOrder,
-        sellOrder: SignedOrder,
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const txHash = await this._dutchAuctionContract.matchOrders.sendTransactionAsync(
-            buyOrder,
-            sellOrder,
-            buyOrder.signature,
-            sellOrder.signature,
-            {
-                from,
-            },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    /**
-     * Calculates the Auction Details for the given order
-     * @param sellOrder The Seller's order. This order is for the lowest amount (at the end of the auction).
-     * @return The dutch auction details.
-     */
-    public async getAuctionDetailsAsync(sellOrder: SignedOrder): Promise<DutchAuctionDetails> {
-        const auctionDetails = await this._dutchAuctionContract.getAuctionDetails.callAsync(sellOrder);
-        return auctionDetails;
-    }
-}
diff --git a/contracts/extensions/test/utils/forwarder_wrapper.ts b/contracts/extensions/test/utils/forwarder_wrapper.ts
deleted file mode 100644
index 4a43be04a..000000000
--- a/contracts/extensions/test/utils/forwarder_wrapper.ts
+++ /dev/null
@@ -1,124 +0,0 @@
-import { artifacts as protocolArtifacts } from '@0x/contracts-protocol';
-import { constants, formatters, LogDecoder, MarketSellOrders } from '@0x/contracts-test-utils';
-import { artifacts as tokensArtifacts } from '@0x/contracts-tokens';
-import { SignedOrder } from '@0x/types';
-import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
-import { Provider, TransactionReceiptWithDecodedLogs, TxDataPayable } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { ForwarderContract } from '../../generated-wrappers/forwarder';
-import { artifacts } from '../../src/artifacts';
-
-export class ForwarderWrapper {
-    private readonly _web3Wrapper: Web3Wrapper;
-    private readonly _forwarderContract: ForwarderContract;
-    private readonly _logDecoder: LogDecoder;
-    public static getPercentageOfValue(value: BigNumber, percentage: number): BigNumber {
-        const numerator = constants.PERCENTAGE_DENOMINATOR.times(percentage).dividedToIntegerBy(100);
-        const newValue = value.times(numerator).dividedToIntegerBy(constants.PERCENTAGE_DENOMINATOR);
-        return newValue;
-    }
-    public static getWethForFeeOrders(feeAmount: BigNumber, feeOrders: SignedOrder[]): BigNumber {
-        let wethAmount = new BigNumber(0);
-        let remainingFeeAmount = feeAmount;
-        _.forEach(feeOrders, feeOrder => {
-            const feeAvailable = feeOrder.makerAssetAmount.minus(feeOrder.takerFee);
-            if (!remainingFeeAmount.isZero() && feeAvailable.gt(remainingFeeAmount)) {
-                wethAmount = wethAmount.plus(
-                    feeOrder.takerAssetAmount
-                        .times(remainingFeeAmount)
-                        .dividedBy(feeAvailable)
-                        .integerValue(BigNumber.ROUND_CEIL),
-                );
-                remainingFeeAmount = new BigNumber(0);
-            } else if (!remainingFeeAmount.isZero()) {
-                wethAmount = wethAmount.plus(feeOrder.takerAssetAmount);
-                remainingFeeAmount = remainingFeeAmount.minus(feeAvailable);
-            }
-        });
-        return wethAmount;
-    }
-    private static _createOptimizedOrders(signedOrders: SignedOrder[]): MarketSellOrders {
-        _.forEach(signedOrders, (signedOrder, index) => {
-            signedOrder.takerAssetData = constants.NULL_BYTES;
-            if (index > 0) {
-                signedOrder.makerAssetData = constants.NULL_BYTES;
-            }
-        });
-        const params = formatters.createMarketSellOrders(signedOrders, constants.ZERO_AMOUNT);
-        return params;
-    }
-    private static _createOptimizedZrxOrders(signedOrders: SignedOrder[]): MarketSellOrders {
-        _.forEach(signedOrders, signedOrder => {
-            signedOrder.makerAssetData = constants.NULL_BYTES;
-            signedOrder.takerAssetData = constants.NULL_BYTES;
-        });
-        const params = formatters.createMarketSellOrders(signedOrders, constants.ZERO_AMOUNT);
-        return params;
-    }
-    constructor(contractInstance: ForwarderContract, provider: Provider) {
-        this._forwarderContract = contractInstance;
-        this._web3Wrapper = new Web3Wrapper(provider);
-        this._logDecoder = new LogDecoder(this._web3Wrapper, {
-            ...artifacts,
-            ...tokensArtifacts,
-            ...protocolArtifacts,
-        });
-    }
-    public async marketSellOrdersWithEthAsync(
-        orders: SignedOrder[],
-        feeOrders: SignedOrder[],
-        txData: TxDataPayable,
-        opts: { feePercentage?: BigNumber; feeRecipient?: string } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = ForwarderWrapper._createOptimizedOrders(orders);
-        const feeParams = ForwarderWrapper._createOptimizedZrxOrders(feeOrders);
-        const feePercentage = _.isUndefined(opts.feePercentage) ? constants.ZERO_AMOUNT : opts.feePercentage;
-        const feeRecipient = _.isUndefined(opts.feeRecipient) ? constants.NULL_ADDRESS : opts.feeRecipient;
-        const txHash = await this._forwarderContract.marketSellOrdersWithEth.sendTransactionAsync(
-            params.orders,
-            params.signatures,
-            feeParams.orders,
-            feeParams.signatures,
-            feePercentage,
-            feeRecipient,
-            txData,
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async marketBuyOrdersWithEthAsync(
-        orders: SignedOrder[],
-        feeOrders: SignedOrder[],
-        makerAssetFillAmount: BigNumber,
-        txData: TxDataPayable,
-        opts: { feePercentage?: BigNumber; feeRecipient?: string } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = ForwarderWrapper._createOptimizedOrders(orders);
-        const feeParams = ForwarderWrapper._createOptimizedZrxOrders(feeOrders);
-        const feePercentage = _.isUndefined(opts.feePercentage) ? constants.ZERO_AMOUNT : opts.feePercentage;
-        const feeRecipient = _.isUndefined(opts.feeRecipient) ? constants.NULL_ADDRESS : opts.feeRecipient;
-        const txHash = await this._forwarderContract.marketBuyOrdersWithEth.sendTransactionAsync(
-            params.orders,
-            makerAssetFillAmount,
-            params.signatures,
-            feeParams.orders,
-            feeParams.signatures,
-            feePercentage,
-            feeRecipient,
-            txData,
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async withdrawAssetAsync(
-        assetData: string,
-        amount: BigNumber,
-        txData: TxDataPayable,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const txHash = await this._forwarderContract.withdrawAsset.sendTransactionAsync(assetData, amount, txData);
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-}
diff --git a/contracts/extensions/tsconfig.json b/contracts/extensions/tsconfig.json
deleted file mode 100644
index ed9b4fbe1..000000000
--- a/contracts/extensions/tsconfig.json
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-    "extends": "../../tsconfig",
-    "compilerOptions": {
-        "outDir": "lib",
-        "rootDir": ".",
-        "resolveJsonModule": true
-    },
-    "include": ["./src/**/*", "./test/**/*", "./generated-wrappers/**/*"],
-    "files": [
-        "./generated-artifacts/BalanceThresholdFilter.json",
-        "./generated-artifacts/DutchAuction.json",
-        "./generated-artifacts/Forwarder.json",
-        "./generated-artifacts/OrderMatcher.json",
-        "./generated-artifacts/OrderValidator.json"
-    ],
-    "exclude": ["./deploy/solc/solc_bin"]
-}
diff --git a/contracts/extensions/tslint.json b/contracts/extensions/tslint.json
deleted file mode 100644
index 1bb3ac2a2..000000000
--- a/contracts/extensions/tslint.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "extends": ["@0x/tslint-config"],
-    "rules": {
-        "custom-no-magic-numbers": false
-    }
-}