Merge remote-tracking branch 'origin/development' into feature/utils/prettybignum

55 files changed, 1742 insertions, 989 deletions

diff --git a/packages/contract-wrappers/CHANGELOG.json b/packages/contract-wrappers/CHANGELOG.json
index d50043b0d..9ff372e33 100644
--- a/packages/contract-wrappers/CHANGELOG.json
+++ b/packages/contract-wrappers/CHANGELOG.json
@@ -1,14 +1,187 @@
 [
     {
-        "version": "1.0.1-rc.4",
+        "version": "3.0.1",
         "changes": [
             {
-                "pr": 975,
-                "note": "Added Transaction Encoder for use with 0x Exchange executeTransaction"
+                "note": "Fix bug in `ForwarderWrapper` where `feeRecipientAddress` was not correctly normalized.",
+                "pr": 1178
             }
         ]
     },
     {
+        "version": "3.0.0",
+        "changes": [
+            {
+                "note": "Add optional validation to the forwarder wrapper methods"
+            },
+            {
+                "note": "Updated to use new modularized artifacts.",
+                "pr": 1105
+            },
+            {
+                "note": "Top-level `ContractWrappers` class has a new optional `contractAddresses` parameter.",
+                "pr": 1105
+            },
+            {
+                "note":
+                    "Default contract addresses are no longer stored in artifacts and are instead loaded from the `@0xproject/contract-addresses` package.",
+                "pr": 1105
+            },
+            {
+                "note":
+                    "Most contract addresses are now defined at instantiation time and are available as properties (e.g., `exchangeWrapper.address`) instead of methods (e.g., `exchangeWrapper.getContractAddress()`).",
+                "pr": 1105
+            },
+            {
+                "note":
+                    "Removed `setProvider` method in top-level `ContractWrapper` class and added new `unsubscribeAll` method.",
+                "pr": 1105
+            },
+            {
+                "note":
+                    "Some properties and methods have been renamed. For example, some methods that previously could throw no longer can, and so their names have been updated accordingly.",
+                "pr": 1105
+            },
+            {
+                "note":
+                    "Removed ContractNotFound errors. Checking for this error was somewhat ineffecient. Relevant methods/functions now return the default error from web3-wrapper, which we feel provides enough information.",
+                "pr": 1105
+            },
+            {
+                "note": "Add `ForwarderWrapperError` to public interface",
+                "pr": 1147
+            },
+            {
+                "note": "Add `ContractWrapperError.SignatureRequestDenied` to public interface",
+                "pr": 1147
+            }
+        ],
+        "timestamp": 1539871071
+    },
+    {
+        "version": "2.0.2",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1538693146
+    },
+    {
+        "timestamp": 1538157789,
+        "version": "2.0.1",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ]
+    },
+    {
+        "version": "2.0.0",
+        "changes": [
+            {
+                "note":
+                    "Fixes dropped events in subscriptions by fetching logs by blockHash instead of blockNumber. Support for fetching by blockHash was added in Geth > v1.8.13 and Parity > v2.1.0. Infura works too.",
+                "pr": 1080
+            },
+            {
+                "note":
+                    "Fix misunderstanding about blockstream interface callbacks and pass the raw JSON RPC responses to it",
+                "pr": 1080
+            }
+        ],
+        "timestamp": 1537907159
+    },
+    {
+        "version": "1.0.5",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1537875740
+    },
+    {
+        "version": "1.0.4",
+        "changes": [
+            {
+                "note": "Dependencies updated"
+            }
+        ],
+        "timestamp": 1537541580
+    },
+    {
+        "version": "1.0.3",
+        "changes": [
+            {
+                "note": "Drastically reduce the bundle size by removing unused parts of included contract artifacts."
+            }
+        ],
+        "timestamp": 1537369748
+    },
+    {
+        "version": "1.0.2",
+        "changes": [
+            {
+                "note": "Add ZRX & WETH mainnet contract addresses into the included artifacts"
+            }
+        ],
+        "timestamp": 1537265493
+    },
+    {
+        "version": "1.0.1",
+        "changes": [
+            {
+                "note": "Add `OrderValidatorWrapper`"
+            },
+            {
+                "note":
+                    "Fix bug where contracts not deployed on a network showed an `EXCHANGE_CONTRACT_DOES_NOT_EXIST` error instead of `CONTRACT_NOT_DEPLOYED_ON_NETWORK`",
+                "pr": 1044
+            },
+            {
+                "note":
+                    "Export `AssetBalanceAndProxyAllowanceFetcher` and `OrderFilledCancelledFetcher` implementations",
+                "pr": 1054
+            },
+            {
+                "note":
+                    "Add `validateOrderFillableOrThrowAsync` and `validateFillOrderThrowIfInvalidAsync` to ExchangeWrapper",
+                "pr": 1054
+            }
+        ],
+        "timestamp": 1536142250
+    },
+    {
+        "version": "1.0.1-rc.5",
+        "changes": [
+            {
+                "note": "Fix missing `BlockParamLiteral` type import issue"
+            }
+        ],
+        "timestamp": 1535377027
+    },
+    {
+        "version": "1.0.1-rc.4",
+        "changes": [
+            {
+                "note":
+                    "Export missing types: `TransactionEncoder`, `ContractAbi`, `JSONRPCRequestPayload`, `JSONRPCResponsePayload`, `JSONRPCErrorCallback`, `AbiDefinition`, `FunctionAbi`, `EventAbi`, `EventParameter`, `DecodedLogArgs`, `MethodAbi`, `ConstructorAbi`, `FallbackAbi`, `DataItem`, `ConstructorStateMutability`, `StateMutability` & `ExchangeSignatureValidatorApprovalEventArgs`",
+                "pr": 924
+            },
+            {
+                "note":
+                    "Remove superfluous exported types: `ContractEvent`, `Token`, `OrderFillRequest`, `ContractEventArgs`, `LogEvent`, `OnOrderStateChangeCallback`,     `ECSignature`, `OrderStateValid`, `OrderStateInvalid`, `OrderState`, `FilterObject`, `TransactionReceipt` & `TransactionReceiptWithDecodedLogs`",
+                "pr": 924
+            },
+            {
+                "note": "Added Transaction Encoder for use with 0x Exchange executeTransaction",
+                "pr": 975
+            }
+        ],
+        "timestamp": 1535133899
+    },
+    {
         "version": "1.0.1-rc.3",
         "changes": [
             {
diff --git a/packages/contract-wrappers/CHANGELOG.md b/packages/contract-wrappers/CHANGELOG.md
index c2ad7218e..6f3005831 100644
--- a/packages/contract-wrappers/CHANGELOG.md
+++ b/packages/contract-wrappers/CHANGELOG.md
@@ -5,7 +5,64 @@ Edit the package's CHANGELOG.json file only.
 
 CHANGELOG
 
-## v1.0.1-rc.3 - _August 13, 2018_
+## v3.0.0 - _October 18, 2018_
+
+    * Add optional validation to the forwarder wrapper methods
+    * Updated to use new modularized artifacts. (#1105)
+    * Top-level `ContractWrappers` class has a new optional `contractAddresses` parameter. (#1105)
+    * Default contract addresses are no longer stored in artifacts and are instead loaded from the `@0xproject/contract-addresses` package. (#1105)
+    * Most contract addresses are now defined at instantiation time and are available as properties (e.g., `exchangeWrapper.address`) instead of methods (e.g., `exchangeWrapper.getContractAddress()`). (#1105)
+    * Removed `setProvider` method in top-level `ContractWrapper` class and added new `unsubscribeAll` method. (#1105)
+    * Some properties and methods have been renamed. For example, some methods that previously could throw no longer can, and so their names have been updated accordingly. (#1105)
+    * Removed ContractNotFound errors. Checking for this error was somewhat ineffecient. Relevant methods/functions now return the default error from web3-wrapper, which we feel provides enough information. (#1105)
+
+## v2.0.2 - _October 4, 2018_
+
+    * Dependencies updated
+
+## v2.0.1 - _September 28, 2018_
+
+    * Dependencies updated
+
+## v2.0.0 - _September 25, 2018_
+
+    * Fixes dropped events in subscriptions by fetching logs by blockHash instead of blockNumber. Support for fetching by blockHash was added in Geth > v1.8.13 and Parity > v2.1.0. Infura works too. (#1080)
+    * Fix misunderstanding about blockstream interface callbacks and pass the raw JSON RPC responses to it (#1080)
+
+## v1.0.5 - _September 25, 2018_
+
+    * Dependencies updated
+
+## v1.0.4 - _September 21, 2018_
+
+    * Dependencies updated
+
+## v1.0.3 - _September 19, 2018_
+
+    * Drastically reduce the bundle size by removing unused parts of included contract artifacts.
+
+## v1.0.2 - _September 18, 2018_
+
+    * Add ZRX & WETH mainnet contract addresses into the included artifacts
+
+## v1.0.1 - _September 5, 2018_
+
+    * Add `OrderValidatorWrapper`
+    * Fix bug where contracts not deployed on a network showed an `EXCHANGE_CONTRACT_DOES_NOT_EXIST` error instead of `CONTRACT_NOT_DEPLOYED_ON_NETWORK` (#1044)
+    * Export `AssetBalanceAndProxyAllowanceFetcher` and `OrderFilledCancelledFetcher` implementations (#1054)
+    * Add `validateOrderFillableOrThrowAsync` and `validateFillOrderThrowIfInvalidAsync` to ExchangeWrapper (#1054)
+
+## v1.0.1-rc.5 - _August 27, 2018_
+
+    * Fix missing `BlockParamLiteral` type import issue
+
+## v1.0.1-rc.4 - _August 24, 2018_
+
+    * Export missing types: `TransactionEncoder`, `ContractAbi`, `JSONRPCRequestPayload`, `JSONRPCResponsePayload`, `JSONRPCErrorCallback`, `AbiDefinition`, `FunctionAbi`, `EventAbi`, `EventParameter`, `DecodedLogArgs`, `MethodAbi`, `ConstructorAbi`, `FallbackAbi`, `DataItem`, `ConstructorStateMutability`, `StateMutability` & `ExchangeSignatureValidatorApprovalEventArgs` (#924)
+    * Remove superfluous exported types: `ContractEvent`, `Token`, `OrderFillRequest`, `ContractEventArgs`, `LogEvent`, `OnOrderStateChangeCallback`,     `ECSignature`, `OrderStateValid`, `OrderStateInvalid`, `OrderState`, `FilterObject`, `TransactionReceipt` & `TransactionReceiptWithDecodedLogs` (#924)
+    * Added Transaction Encoder for use with 0x Exchange executeTransaction (#975)
+
+## v1.0.1-rc.3 - _August 14, 2018_
 
     * Added strict encoding/decoding checks for sendTransaction and call (#915)
     * Add ForwarderWrapper (#934)
diff --git a/packages/contract-wrappers/README.md b/packages/contract-wrappers/README.md
index 6153f798e..36f2f48fb 100644
--- a/packages/contract-wrappers/README.md
+++ b/packages/contract-wrappers/README.md
@@ -1,4 +1,4 @@
-## @0xproject/contract-wrappers
+## @0x/contract-wrappers
 
 Smart TS wrappers for 0x smart contracts. The wrappers have simplified interfaces, perform client-side validation on transactions and throw helpful error messages.
 
@@ -9,20 +9,20 @@ Smart TS wrappers for 0x smart contracts. The wrappers have simplified interface
 **Install**
 
 ```bash
-npm install @0xproject/contract-wrappers --save
+npm install @0x/contract-wrappers --save
 ```
 
 **Import**
 
 ```javascript
-import { ContractWrappers } from '@0xproject/contract-wrappers';
+import { ContractWrappers } from '@0x/contract-wrappers';
 ```
 
 If your project is in [TypeScript](https://www.typescriptlang.org/), add the following to your `tsconfig.json`:
 
 ```json
 "compilerOptions": {
-    "typeRoots": ["node_modules/@0xproject/typescript-typings/types", "node_modules/@types"],
+    "typeRoots": ["node_modules/@0x/typescript-typings/types", "node_modules/@types"],
 }
 ```
 
@@ -51,13 +51,13 @@ yarn install
 To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:
 
 ```bash
-PKG=@0xproject/contract-wrappers yarn build
+PKG=@0x/contract-wrappers yarn build
 ```
 
 Or continuously rebuild on change:
 
 ```bash
-PKG=@0xproject/contract-wrappers yarn watch
+PKG=@0x/contract-wrappers yarn watch
 ```
 
 ```bash
diff --git a/packages/contract-wrappers/package.json b/packages/contract-wrappers/package.json
index 3399c7a9f..178675763 100644
--- a/packages/contract-wrappers/package.json
+++ b/packages/contract-wrappers/package.json
@@ -1,6 +1,6 @@
 {
-    "name": "@0xproject/contract-wrappers",
-    "version": "1.0.1-rc.3",
+    "name": "@0x/contract-wrappers",
+    "version": "3.0.0",
     "description": "Smart TS wrappers for 0x smart contracts",
     "keywords": [
         "0xproject",
@@ -11,26 +11,22 @@
     "main": "lib/src/index.js",
     "types": "lib/src/index.d.ts",
     "scripts": {
-        "watch_without_deps": "yarn pre_build && tsc -w",
-        "build": "yarn pre_build && tsc && copyfiles -u 3 './lib/src/monorepo_scripts/**/*' ./scripts",
-        "pre_build": "run-s update_artifacts_v2_beta update_artifacts_v2 generate_contract_wrappers copy_artifacts",
-        "generate_contract_wrappers": "abi-gen --abis 'src/artifacts/@(Exchange|DummyERC20Token|DummyERC721Token|ZRXToken|ERC20Token|ERC721Token|WETH9|ERC20Proxy|ERC721Proxy|Forwarder).json' --template ../contract_templates/contract.handlebars --partials '../contract_templates/partials/**/*.handlebars' --output src/contract_wrappers/generated --backend ethers",
-        "lint": "tslint --project . --exclude **/src/contract_wrappers/**/* --exclude **/lib/**/*",
+        "build": "tsc -b",
+        "build:ci": "yarn build",
+        "lint": "tslint --format stylish --project . --exclude **/lib/**/*",
         "test:circleci": "run-s test:coverage",
         "test": "yarn run_mocha",
         "rebuild_and_test": "run-s build test",
         "test:coverage": "nyc npm run test --all && yarn coverage:report:lcov",
         "coverage:report:lcov": "nyc report --reporter=text-lcov > coverage/lcov.info",
-        "update_artifacts_v2_beta": "for i in ${npm_package_config_contracts_v2_beta}; do copyfiles -u 4 ../migrations/artifacts/2.0.0-beta-testnet/$i.json src/artifacts; done;",
-        "update_artifacts_v2": "for i in ${npm_package_config_contracts_v2}; do copyfiles -u 4 ../migrations/artifacts/2.0.0/$i.json src/artifacts; done;",
-        "copy_artifacts": "copyfiles -u 2 './src/artifacts/**/*.json' ./lib/src/artifacts",
-        "clean": "shx rm -rf _bundles lib test_temp scripts test/artifacts src/contract_wrappers/generated src/artifacts",
+        "clean": "shx rm -rf _bundles lib test_temp generated_docs",
         "run_mocha": "mocha --require source-map-support/register --require make-promises-safe lib/test/**/*_test.js lib/test/global_hooks.js --timeout 10000 --bail --exit",
-        "manual:postpublish": "yarn build; node ./scripts/postpublish.js"
+        "docs:json": "typedoc --excludePrivate --excludeExternals --target ES5 --tsconfig typedoc-tsconfig.json --json $JSON_FILE_PATH $PROJECT_FILES"
     },
     "config": {
-        "contracts_v2_beta": "AssetProxyOwner Exchange ERC20Proxy ERC20Token ERC721Proxy ERC721Token WETH9 ZRXToken Forwarder",
-        "contracts_v2": "DummyERC20Token DummyERC721Token"
+        "postpublish": {
+            "assets": []
+        }
     },
     "repository": {
         "type": "git",
@@ -41,23 +37,19 @@
         "node": ">=6.0.0"
     },
     "devDependencies": {
-        "@0xproject/abi-gen": "^1.0.5",
-        "@0xproject/dev-utils": "^1.0.4",
-        "@0xproject/migrations": "^1.0.4",
-        "@0xproject/monorepo-scripts": "^1.0.5",
-        "@0xproject/sol-compiler": "^1.0.5",
-        "@0xproject/subproviders": "^1.0.5",
-        "@0xproject/tslint-config": "^1.0.5",
+        "@0x/dev-utils": "^1.0.13",
+        "@0x/migrations": "^2.0.0",
+        "@0x/subproviders": "^2.1.0",
+        "@0x/tslint-config": "^1.0.9",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^2.2.42",
-        "@types/node": "^8.0.53",
+        "@types/node": "*",
         "@types/sinon": "^2.2.2",
         "@types/uuid": "^3.4.2",
-        "awesome-typescript-loader": "^3.1.3",
+        "@types/web3-provider-engine": "^14.0.0",
         "chai": "^4.0.1",
         "chai-as-promised": "^7.1.0",
         "chai-bignumber": "^2.0.1",
-        "copyfiles": "^2.0.0",
         "dirty-chai": "^2.0.1",
         "make-promises-safe": "^1.1.0",
         "mocha": "^4.1.0",
@@ -68,23 +60,26 @@
         "sinon": "^4.0.0",
         "source-map-support": "^0.5.0",
         "tslint": "5.11.0",
+        "typedoc": "0.13.0",
         "typescript": "3.0.1",
         "web3-provider-engine": "14.0.6"
     },
     "dependencies": {
-        "@0xproject/assert": "^1.0.5",
-        "@0xproject/base-contract": "^2.0.0-rc.1",
-        "@0xproject/fill-scenarios": "^1.0.1-rc.3",
-        "@0xproject/json-schemas": "^1.0.1-rc.4",
-        "@0xproject/order-utils": "^1.0.1-rc.3",
-        "@0xproject/types": "^1.0.1-rc.4",
-        "@0xproject/typescript-typings": "^1.0.4",
-        "@0xproject/utils": "^1.0.5",
-        "@0xproject/web3-wrapper": "^1.2.0",
-        "ethereum-types": "^1.0.4",
-        "ethereumjs-blockstream": "5.0.0",
+        "@0x/abi-gen-wrappers": "^1.0.1",
+        "@0x/assert": "^1.0.14",
+        "@0x/contract-addresses": "^1.0.1",
+        "@0x/contract-artifacts": "^1.0.1",
+        "@0x/fill-scenarios": "^1.0.8",
+        "@0x/json-schemas": "^2.0.0",
+        "@0x/order-utils": "^2.0.0",
+        "@0x/types": "^1.2.0",
+        "@0x/typescript-typings": "^3.0.3",
+        "@0x/utils": "^2.0.3",
+        "@0x/web3-wrapper": "^3.1.0",
+        "ethereum-types": "^1.1.1",
+        "ethereumjs-blockstream": "6.0.0",
         "ethereumjs-util": "^5.1.1",
-        "ethers": "3.0.22",
+        "ethers": "~4.0.4",
         "js-sha3": "^0.7.0",
         "lodash": "^4.17.5",
         "uuid": "^3.1.0"
diff --git a/packages/contract-wrappers/src/abstract/abstract_balance_and_proxy_allowance_lazy_store.ts b/packages/contract-wrappers/src/abstract/abstract_balance_and_proxy_allowance_lazy_store.ts
index 1f139f1ef..b095c8e79 100644
--- a/packages/contract-wrappers/src/abstract/abstract_balance_and_proxy_allowance_lazy_store.ts
+++ b/packages/contract-wrappers/src/abstract/abstract_balance_and_proxy_allowance_lazy_store.ts
@@ -1,4 +1,4 @@
-import { BigNumber } from '@0xproject/utils';
+import { BigNumber } from '@0x/utils';
 
 export abstract class AbstractBalanceAndProxyAllowanceLazyStore {
     public abstract async getBalanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber>;
diff --git a/packages/contract-wrappers/src/artifacts.ts b/packages/contract-wrappers/src/artifacts.ts
deleted file mode 100644
index 2481b311a..000000000
--- a/packages/contract-wrappers/src/artifacts.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-import { ContractArtifact } from '@0xproject/sol-compiler';
-
-import * as DummyERC20Token from './artifacts/DummyERC20Token.json';
-import * as DummyERC721Token from './artifacts/DummyERC721Token.json';
-import * as ERC20Proxy from './artifacts/ERC20Proxy.json';
-import * as ERC20Token from './artifacts/ERC20Token.json';
-import * as ERC721Proxy from './artifacts/ERC721Proxy.json';
-import * as ERC721Token from './artifacts/ERC721Token.json';
-import * as Exchange from './artifacts/Exchange.json';
-import * as Forwarder from './artifacts/Forwarder.json';
-import * as EtherToken from './artifacts/WETH9.json';
-import * as ZRXToken from './artifacts/ZRXToken.json';
-
-export const artifacts = {
-    ZRXToken: (ZRXToken as any) as ContractArtifact,
-    DummyERC20Token: (DummyERC20Token as any) as ContractArtifact,
-    DummyERC721Token: (DummyERC721Token as any) as ContractArtifact,
-    ERC20Token: (ERC20Token as any) as ContractArtifact,
-    ERC721Token: (ERC721Token as any) as ContractArtifact,
-    Exchange: (Exchange as any) as ContractArtifact,
-    EtherToken: (EtherToken as any) as ContractArtifact,
-    ERC20Proxy: (ERC20Proxy as any) as ContractArtifact,
-    ERC721Proxy: (ERC721Proxy as any) as ContractArtifact,
-    Forwarder: (Forwarder as any) as ContractArtifact,
-};
diff --git a/packages/contract-wrappers/src/contract_wrappers.ts b/packages/contract-wrappers/src/contract_wrappers.ts
index 4277a0746..0c535bd5c 100644
--- a/packages/contract-wrappers/src/contract_wrappers.ts
+++ b/packages/contract-wrappers/src/contract_wrappers.ts
@@ -1,10 +1,17 @@
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import {
+    ERC20Proxy,
+    ERC20Token,
+    ERC721Proxy,
+    ERC721Token,
+    Exchange,
+    Forwarder,
+    OrderValidator,
+    WETH9,
+} from '@0x/contract-artifacts';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { Provider } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { constants } from './utils/constants';
-
-import { artifacts } from './artifacts';
 import { ERC20ProxyWrapper } from './contract_wrappers/erc20_proxy_wrapper';
 import { ERC20TokenWrapper } from './contract_wrappers/erc20_token_wrapper';
 import { ERC721ProxyWrapper } from './contract_wrappers/erc721_proxy_wrapper';
@@ -12,11 +19,13 @@ import { ERC721TokenWrapper } from './contract_wrappers/erc721_token_wrapper';
 import { EtherTokenWrapper } from './contract_wrappers/ether_token_wrapper';
 import { ExchangeWrapper } from './contract_wrappers/exchange_wrapper';
 import { ForwarderWrapper } from './contract_wrappers/forwarder_wrapper';
+import { OrderValidatorWrapper } from './contract_wrappers/order_validator_wrapper';
 import { ContractWrappersConfigSchema } from './schemas/contract_wrappers_config_schema';
-import { contractWrappersPrivateNetworkConfigSchema } from './schemas/contract_wrappers_private_network_config_schema';
-import { contractWrappersPublicNetworkConfigSchema } from './schemas/contract_wrappers_public_network_config_schema';
 import { ContractWrappersConfig } from './types';
 import { assert } from './utils/assert';
+import { constants } from './utils/constants';
+import { _getDefaultContractAddresses } from './utils/contract_addresses';
+
 /**
  * The ContractWrappers class contains smart contract wrappers helpful when building on 0x protocol.
  */
@@ -52,39 +61,47 @@ export class ContractWrappers {
      * An instance of the ForwarderWrapper class containing methods for interacting with any Forwarder smart contract.
      */
     public forwarder: ForwarderWrapper;
+    /**
+     * An instance of the OrderValidatorWrapper class containing methods for interacting with any OrderValidator smart contract.
+     */
+    public orderValidator: OrderValidatorWrapper;
 
-    private _web3Wrapper: Web3Wrapper;
+    private readonly _web3Wrapper: Web3Wrapper;
     /**
      * Instantiates a new ContractWrappers instance.
-     * @param   provider    The Provider instance you would like the 0x.js library to use for interacting with
+     * @param   provider    The Provider instance you would like the contract-wrappers library to use for interacting with
      *                      the Ethereum network.
      * @param   config      The configuration object. Look up the type for the description.
      * @return  An instance of the ContractWrappers class.
      */
     constructor(provider: Provider, config: ContractWrappersConfig) {
         assert.isWeb3Provider('provider', provider);
-        assert.doesConformToSchema('config', config, ContractWrappersConfigSchema, [
-            contractWrappersPrivateNetworkConfigSchema,
-            contractWrappersPublicNetworkConfigSchema,
-        ]);
-        const artifactJSONs = _.values(artifacts);
-        const abiArrays = _.map(artifactJSONs, artifact => artifact.compilerOutput.abi);
+        assert.doesConformToSchema('config', config, ContractWrappersConfigSchema);
         const txDefaults = {
             gasPrice: config.gasPrice,
         };
         this._web3Wrapper = new Web3Wrapper(provider, txDefaults);
-        _.forEach(abiArrays, abi => {
-            this._web3Wrapper.abiDecoder.addABI(abi);
+        const artifactsArray = [
+            ERC20Proxy,
+            ERC20Token,
+            ERC721Proxy,
+            ERC721Token,
+            Exchange,
+            Forwarder,
+            OrderValidator,
+            WETH9,
+        ];
+        _.forEach(artifactsArray, artifact => {
+            this._web3Wrapper.abiDecoder.addABI(artifact.compilerOutput.abi);
         });
         const blockPollingIntervalMs = _.isUndefined(config.blockPollingIntervalMs)
             ? constants.DEFAULT_BLOCK_POLLING_INTERVAL
             : config.blockPollingIntervalMs;
-        this.erc20Proxy = new ERC20ProxyWrapper(this._web3Wrapper, config.networkId, config.erc20ProxyContractAddress);
-        this.erc721Proxy = new ERC721ProxyWrapper(
-            this._web3Wrapper,
-            config.networkId,
-            config.erc721ProxyContractAddress,
-        );
+        const contractAddresses = _.isUndefined(config.contractAddresses)
+            ? _getDefaultContractAddresses(config.networkId)
+            : config.contractAddresses;
+        this.erc20Proxy = new ERC20ProxyWrapper(this._web3Wrapper, config.networkId, contractAddresses.erc20Proxy);
+        this.erc721Proxy = new ERC721ProxyWrapper(this._web3Wrapper, config.networkId, contractAddresses.erc721Proxy);
         this.erc20Token = new ERC20TokenWrapper(
             this._web3Wrapper,
             config.networkId,
@@ -106,36 +123,36 @@ export class ContractWrappers {
         this.exchange = new ExchangeWrapper(
             this._web3Wrapper,
             config.networkId,
-            config.exchangeContractAddress,
-            config.zrxContractAddress,
+            this.erc20Token,
+            this.erc721Token,
+            contractAddresses.exchange,
+            contractAddresses.zrxToken,
             blockPollingIntervalMs,
         );
         this.forwarder = new ForwarderWrapper(
             this._web3Wrapper,
             config.networkId,
-            config.forwarderContractAddress,
-            config.zrxContractAddress,
+            contractAddresses.forwarder,
+            contractAddresses.zrxToken,
+            contractAddresses.etherToken,
+        );
+        this.orderValidator = new OrderValidatorWrapper(
+            this._web3Wrapper,
+            config.networkId,
+            contractAddresses.orderValidator,
         );
     }
     /**
-     * Sets a new web3 provider for 0x.js. Updating the provider will stop all
-     * subscriptions so you will need to re-subscribe to all events relevant to your app after this call.
-     * @param   provider    The Web3Provider you would like the 0x.js library to use from now on.
-     * @param   networkId   The id of the network your provider is connected to
+     * Unsubscribes from all subscriptions for all contracts.
      */
-    public setProvider(provider: Provider, networkId: number): void {
-        this._web3Wrapper.setProvider(provider);
-        (this.exchange as any)._invalidateContractInstances();
-        (this.exchange as any)._setNetworkId(networkId);
-        (this.erc20Token as any)._invalidateContractInstances();
-        (this.erc20Token as any)._setNetworkId(networkId);
-        (this.erc20Proxy as any)._invalidateContractInstance();
-        (this.erc20Proxy as any)._setNetworkId(networkId);
-        (this.etherToken as any)._invalidateContractInstance();
-        (this.etherToken as any)._setNetworkId(networkId);
+    public unsubscribeAll(): void {
+        this.exchange.unsubscribeAll();
+        this.erc20Token.unsubscribeAll();
+        this.erc721Token.unsubscribeAll();
+        this.etherToken.unsubscribeAll();
     }
     /**
-     * Get the provider instance currently used by 0x.js
+     * Get the provider instance currently used by contract-wrappers
      * @return  Web3 provider instance
      */
     public getProvider(): Provider {
diff --git a/packages/contract-wrappers/src/contract_wrappers/contract_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/contract_wrapper.ts
index daf70253a..749aaae10 100644
--- a/packages/contract-wrappers/src/contract_wrappers/contract_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/contract_wrapper.ts
@@ -1,7 +1,14 @@
-import { ContractArtifact } from '@0xproject/sol-compiler';
-import { AbiDecoder, intervalUtils, logUtils } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { BlockParamLiteral, ContractAbi, FilterObject, LogEntry, LogWithDecodedArgs, RawLog } from 'ethereum-types';
+import { AbiDecoder, intervalUtils, logUtils } from '@0x/utils';
+import { marshaller, Web3Wrapper } from '@0x/web3-wrapper';
+import {
+    BlockParamLiteral,
+    ContractAbi,
+    FilterObject,
+    LogEntry,
+    LogWithDecodedArgs,
+    RawLog,
+    RawLogEntry,
+} from 'ethereum-types';
 import { Block, BlockAndLogStreamer, Log } from 'ethereumjs-blockstream';
 import * as _ from 'lodash';
 
@@ -16,27 +23,15 @@ import {
 import { constants } from '../utils/constants';
 import { filterUtils } from '../utils/filter_utils';
 
-const CONTRACT_NAME_TO_NOT_FOUND_ERROR: {
-    [contractName: string]: ContractWrappersError;
-} = {
-    ZRX: ContractWrappersError.ZRXContractDoesNotExist,
-    EtherToken: ContractWrappersError.EtherTokenContractDoesNotExist,
-    ERC20Token: ContractWrappersError.ERC20TokenContractDoesNotExist,
-    ERC20Proxy: ContractWrappersError.ERC20ProxyContractDoesNotExist,
-    ERC721Token: ContractWrappersError.ERC721TokenContractDoesNotExist,
-    ERC721Proxy: ContractWrappersError.ERC721ProxyContractDoesNotExist,
-    Exchange: ContractWrappersError.ExchangeContractDoesNotExist,
-};
-
 export abstract class ContractWrapper {
     public abstract abi: ContractAbi;
-    protected _web3Wrapper: Web3Wrapper;
     protected _networkId: number;
+    protected _web3Wrapper: Web3Wrapper;
     private _blockAndLogStreamerIfExists: BlockAndLogStreamer<Block, Log> | undefined;
-    private _blockPollingIntervalMs: number;
+    private readonly _blockPollingIntervalMs: number;
     private _blockAndLogStreamIntervalIfExists?: NodeJS.Timer;
-    private _filters: { [filterToken: string]: FilterObject };
-    private _filterCallbacks: {
+    private readonly _filters: { [filterToken: string]: FilterObject };
+    private readonly _filterCallbacks: {
         [filterToken: string]: EventCallback<ContractEventArgs>;
     };
     private _onLogAddedSubscriptionToken: string | undefined;
@@ -116,38 +111,8 @@ export abstract class ContractWrapper {
         const logWithDecodedArgs = abiDecoder.tryToDecodeLogOrNoop(log);
         return logWithDecodedArgs;
     }
-    protected async _getContractAbiAndAddressFromArtifactsAsync(
-        artifact: ContractArtifact,
-        addressIfExists?: string,
-    ): Promise<[ContractAbi, string]> {
-        let contractAddress: string;
-        if (_.isUndefined(addressIfExists)) {
-            if (_.isUndefined(artifact.networks[this._networkId])) {
-                throw new Error(ContractWrappersError.ContractNotDeployedOnNetwork);
-            }
-            contractAddress = artifact.networks[this._networkId].address.toLowerCase();
-        } else {
-            contractAddress = addressIfExists;
-        }
-        const doesContractExist = await this._web3Wrapper.doesContractExistAtAddressAsync(contractAddress);
-        if (!doesContractExist) {
-            throw new Error(CONTRACT_NAME_TO_NOT_FOUND_ERROR[artifact.contractName]);
-        }
-        const abiAndAddress: [ContractAbi, string] = [artifact.compilerOutput.abi, contractAddress];
-        return abiAndAddress;
-    }
-    protected _getContractAddress(artifact: ContractArtifact, addressIfExists?: string): string {
-        if (_.isUndefined(addressIfExists)) {
-            const contractAddress = artifact.networks[this._networkId].address;
-            if (_.isUndefined(contractAddress)) {
-                throw new Error(ContractWrappersError.ExchangeContractDoesNotExist);
-            }
-            return contractAddress;
-        } else {
-            return addressIfExists;
-        }
-    }
-    private _onLogStateChanged<ArgsType extends ContractEventArgs>(isRemoved: boolean, log: LogEntry): void {
+    private _onLogStateChanged<ArgsType extends ContractEventArgs>(isRemoved: boolean, rawLog: RawLogEntry): void {
+        const log: LogEntry = marshaller.unmarshalLog(rawLog);
         _.forEach(this._filters, (filter: FilterObject, filterToken: string) => {
             if (filterUtils.matchesFilter(log, filter)) {
                 const decodedLog = this._tryToDecodeLogOrNoop(log) as LogWithDecodedArgs<ArgsType>;
@@ -164,8 +129,8 @@ export abstract class ContractWrapper {
             throw new Error(ContractWrappersError.SubscriptionAlreadyPresent);
         }
         this._blockAndLogStreamerIfExists = new BlockAndLogStreamer(
-            this._web3Wrapper.getBlockAsync.bind(this._web3Wrapper),
-            this._web3Wrapper.getLogsAsync.bind(this._web3Wrapper),
+            this._blockstreamGetBlockOrNullAsync.bind(this),
+            this._blockstreamGetLogsAsync.bind(this),
             ContractWrapper._onBlockAndLogStreamerError.bind(this, isVerbose),
         );
         const catchAllLogFilter = {};
@@ -184,13 +149,31 @@ export abstract class ContractWrapper {
             this._onLogStateChanged.bind(this, isRemoved),
         );
     }
-    // HACK: This should be a package-scoped method (which doesn't exist in TS)
-    // We don't want this method available in the public interface for all classes
-    // who inherit from ContractWrapper, and it is only used by the internal implementation
-    // of those higher classes.
-    // tslint:disable-next-line:no-unused-variable
-    private _setNetworkId(networkId: number): void {
-        this._networkId = networkId;
+    // This method only exists in order to comply with the expected interface of Blockstream's constructor
+    private async _blockstreamGetBlockOrNullAsync(hash: string): Promise<Block | null> {
+        const shouldIncludeTransactionData = false;
+        const blockOrNull = await this._web3Wrapper.sendRawPayloadAsync<Block | null>({
+            method: 'eth_getBlockByHash',
+            params: [hash, shouldIncludeTransactionData],
+        });
+        return blockOrNull;
+    }
+    // This method only exists in order to comply with the expected interface of Blockstream's constructor
+    private async _blockstreamGetLatestBlockOrNullAsync(): Promise<Block | null> {
+        const shouldIncludeTransactionData = false;
+        const blockOrNull = await this._web3Wrapper.sendRawPayloadAsync<Block | null>({
+            method: 'eth_getBlockByNumber',
+            params: [BlockParamLiteral.Latest, shouldIncludeTransactionData],
+        });
+        return blockOrNull;
+    }
+    // This method only exists in order to comply with the expected interface of Blockstream's constructor
+    private async _blockstreamGetLogsAsync(filterOptions: FilterObject): Promise<RawLogEntry[]> {
+        const logs = await this._web3Wrapper.sendRawPayloadAsync<RawLogEntry[]>({
+            method: 'eth_getLogs',
+            params: [filterOptions],
+        });
+        return logs as RawLogEntry[];
     }
     private _stopBlockAndLogStream(): void {
         if (_.isUndefined(this._blockAndLogStreamerIfExists)) {
@@ -202,11 +185,14 @@ export abstract class ContractWrapper {
         delete this._blockAndLogStreamerIfExists;
     }
     private async _reconcileBlockAsync(): Promise<void> {
-        const latestBlock = await this._web3Wrapper.getBlockAsync(BlockParamLiteral.Latest);
+        const latestBlockOrNull = await this._blockstreamGetLatestBlockOrNullAsync();
+        if (_.isNull(latestBlockOrNull)) {
+            return; // noop
+        }
         // We need to coerce to Block type cause Web3.Block includes types for mempool blocks
         if (!_.isUndefined(this._blockAndLogStreamerIfExists)) {
             // If we clear the interval while fetching the block - this._blockAndLogStreamer will be undefined
-            await this._blockAndLogStreamerIfExists.reconcileNewBlock((latestBlock as any) as Block);
+            await this._blockAndLogStreamerIfExists.reconcileNewBlock(latestBlockOrNull);
         }
     }
 }
diff --git a/packages/contract-wrappers/src/contract_wrappers/erc20_proxy_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/erc20_proxy_wrapper.ts
index 821d1a8a2..45460bd6d 100644
--- a/packages/contract-wrappers/src/contract_wrappers/erc20_proxy_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/erc20_proxy_wrapper.ts
@@ -1,31 +1,42 @@
-import { AssetProxyId } from '@0xproject/types';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { ERC20ProxyContract } from '@0x/abi-gen-wrappers';
+import { ERC20Proxy } from '@0x/contract-artifacts';
+import { AssetProxyId } from '@0x/types';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { ContractAbi } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { artifacts } from '../artifacts';
 import { assert } from '../utils/assert';
+import { _getDefaultContractAddresses } from '../utils/contract_addresses';
 
 import { ContractWrapper } from './contract_wrapper';
-import { ERC20ProxyContract } from './generated/erc20_proxy';
 
 /**
  * This class includes the functionality related to interacting with the ERC20Proxy contract.
  */
 export class ERC20ProxyWrapper extends ContractWrapper {
-    public abi: ContractAbi = artifacts.ERC20Proxy.compilerOutput.abi;
+    public abi: ContractAbi = ERC20Proxy.compilerOutput.abi;
+    public address: string;
     private _erc20ProxyContractIfExists?: ERC20ProxyContract;
-    private _contractAddressIfExists?: string;
-    constructor(web3Wrapper: Web3Wrapper, networkId: number, contractAddressIfExists?: string) {
+    /**
+     * Instantiate ERC20ProxyWrapper
+     * @param web3Wrapper Web3Wrapper instance to use
+     * @param networkId Desired networkId
+     * @param address The address of the ERC20Proxy contract. If undefined, will
+     * default to the known address corresponding to the networkId.
+     */
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, address?: string) {
         super(web3Wrapper, networkId);
-        this._contractAddressIfExists = contractAddressIfExists;
+        this.address = _.isUndefined(address) ? _getDefaultContractAddresses(networkId).erc20Proxy : address;
     }
     /**
      * Get the 4 bytes ID of this asset proxy
      * @return  Proxy id
      */
     public async getProxyIdAsync(): Promise<AssetProxyId> {
-        const ERC20ProxyContractInstance = await this._getERC20ProxyContractAsync();
+        const ERC20ProxyContractInstance = this._getERC20ProxyContract();
+        // Note(albrow): Below is a TSLint false positive. Code won't compile if
+        // you remove the type assertion.
+        /* tslint:disable-next-line:no-unnecessary-type-assertion */
         const proxyId = (await ERC20ProxyContractInstance.getProxyId.callAsync()) as AssetProxyId;
         return proxyId;
     }
@@ -37,7 +48,7 @@ export class ERC20ProxyWrapper extends ContractWrapper {
     public async isAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
         assert.isETHAddressHex('exchangeContractAddress', exchangeContractAddress);
         const normalizedExchangeContractAddress = exchangeContractAddress.toLowerCase();
-        const ERC20ProxyContractInstance = await this._getERC20ProxyContractAsync();
+        const ERC20ProxyContractInstance = this._getERC20ProxyContract();
         const isAuthorized = await ERC20ProxyContractInstance.authorized.callAsync(normalizedExchangeContractAddress);
         return isAuthorized;
     }
@@ -46,36 +57,17 @@ export class ERC20ProxyWrapper extends ContractWrapper {
      * @return  The list of authorized addresses.
      */
     public async getAuthorizedAddressesAsync(): Promise<string[]> {
-        const ERC20ProxyContractInstance = await this._getERC20ProxyContractAsync();
+        const ERC20ProxyContractInstance = this._getERC20ProxyContract();
         const authorizedAddresses = await ERC20ProxyContractInstance.getAuthorizedAddresses.callAsync();
         return authorizedAddresses;
     }
-    /**
-     * Retrieves the Ethereum address of the ERC20Proxy contract deployed on the network
-     * that the user-passed web3 provider is connected to.
-     * @returns The Ethereum address of the ERC20Proxy contract being used.
-     */
-    public getContractAddress(): string {
-        const contractAddress = this._getContractAddress(artifacts.ERC20Proxy, this._contractAddressIfExists);
-        return contractAddress;
-    }
-    // HACK: We don't want this method to be visible to the other units within that package but not to the end user.
-    // TS doesn't give that possibility and therefore we make it private and access it over an any cast. Because of that tslint sees it as unused.
-    // tslint:disable-next-line:no-unused-variable
-    private _invalidateContractInstance(): void {
-        delete this._erc20ProxyContractIfExists;
-    }
-    private async _getERC20ProxyContractAsync(): Promise<ERC20ProxyContract> {
+    private _getERC20ProxyContract(): ERC20ProxyContract {
         if (!_.isUndefined(this._erc20ProxyContractIfExists)) {
             return this._erc20ProxyContractIfExists;
         }
-        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
-            artifacts.ERC20Proxy,
-            this._contractAddressIfExists,
-        );
         const contractInstance = new ERC20ProxyContract(
-            abi,
-            address,
+            this.abi,
+            this.address,
             this._web3Wrapper.getProvider(),
             this._web3Wrapper.getContractDefaults(),
         );
diff --git a/packages/contract-wrappers/src/contract_wrappers/erc20_token_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/erc20_token_wrapper.ts
index 17bda5085..5e0ec1951 100644
--- a/packages/contract-wrappers/src/contract_wrappers/erc20_token_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/erc20_token_wrapper.ts
@@ -1,10 +1,11 @@
-import { schemas } from '@0xproject/json-schemas';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { ERC20TokenContract, ERC20TokenEventArgs, ERC20TokenEvents } from '@0x/abi-gen-wrappers';
+import { ERC20Token } from '@0x/contract-artifacts';
+import { schemas } from '@0x/json-schemas';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { ContractAbi, LogWithDecodedArgs } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { artifacts } from '../artifacts';
 import { methodOptsSchema } from '../schemas/method_opts_schema';
 import { txOptsSchema } from '../schemas/tx_opts_schema';
 import {
@@ -17,12 +18,10 @@ import {
 } from '../types';
 import { assert } from '../utils/assert';
 import { constants } from '../utils/constants';
+import { utils } from '../utils/utils';
 
 import { ContractWrapper } from './contract_wrapper';
 import { ERC20ProxyWrapper } from './erc20_proxy_wrapper';
-import { ERC20TokenContract, ERC20TokenEventArgs, ERC20TokenEvents } from './generated/erc20_token';
-
-const removeUndefinedProperties = _.pickBy;
 
 /**
  * This class includes all the functionality related to interacting with ERC20 token contracts.
@@ -30,10 +29,17 @@ const removeUndefinedProperties = _.pickBy;
  * to the 0x ERC20 Proxy smart contract.
  */
 export class ERC20TokenWrapper extends ContractWrapper {
-    public abi: ContractAbi = artifacts.ERC20Token.compilerOutput.abi;
+    public abi: ContractAbi = ERC20Token.compilerOutput.abi;
     public UNLIMITED_ALLOWANCE_IN_BASE_UNITS = constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
-    private _tokenContractsByAddress: { [address: string]: ERC20TokenContract };
-    private _erc20ProxyWrapper: ERC20ProxyWrapper;
+    private readonly _tokenContractsByAddress: { [address: string]: ERC20TokenContract };
+    private readonly _erc20ProxyWrapper: ERC20ProxyWrapper;
+    /**
+     * Instantiate ERC20TokenWrapper
+     * @param web3Wrapper Web3Wrapper instance to use
+     * @param networkId Desired networkId
+     * @param erc20ProxyWrapper The ERC20ProxyWrapper instance to use
+     * @param blockPollingIntervalMs The block polling interval to use for active subscriptions
+     */
     constructor(
         web3Wrapper: Web3Wrapper,
         networkId: number,
@@ -101,7 +107,7 @@ export class ERC20TokenWrapper extends ContractWrapper {
         const txHash = await tokenContract.approve.sendTransactionAsync(
             normalizedSpenderAddress,
             amountInBaseUnits,
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 from: normalizedOwnerAddress,
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
@@ -182,7 +188,7 @@ export class ERC20TokenWrapper extends ContractWrapper {
         ownerAddress: string,
         methodOpts: MethodOpts = {},
     ): Promise<BigNumber> {
-        const proxyAddress = this._erc20ProxyWrapper.getContractAddress();
+        const proxyAddress = this._erc20ProxyWrapper.address;
         const allowanceInBaseUnits = await this.getAllowanceAsync(tokenAddress, ownerAddress, proxyAddress, methodOpts);
         return allowanceInBaseUnits;
     }
@@ -202,7 +208,7 @@ export class ERC20TokenWrapper extends ContractWrapper {
         amountInBaseUnits: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
-        const proxyAddress = this._erc20ProxyWrapper.getContractAddress();
+        const proxyAddress = this._erc20ProxyWrapper.address;
         const txHash = await this.setAllowanceAsync(
             tokenAddress,
             ownerAddress,
@@ -271,7 +277,7 @@ export class ERC20TokenWrapper extends ContractWrapper {
         const txHash = await tokenContract.transfer.sendTransactionAsync(
             normalizedToAddress,
             amountInBaseUnits,
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 from: normalizedFromAddress,
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
@@ -332,7 +338,7 @@ export class ERC20TokenWrapper extends ContractWrapper {
             normalizedFromAddress,
             normalizedToAddress,
             amountInBaseUnits,
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 from: normalizedSenderAddress,
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
@@ -366,7 +372,7 @@ export class ERC20TokenWrapper extends ContractWrapper {
             normalizedTokenAddress,
             eventName,
             indexFilterValues,
-            artifacts.ERC20Token.compilerOutput.abi,
+            ERC20Token.compilerOutput.abi,
             callback,
             isVerbose,
         );
@@ -411,30 +417,19 @@ export class ERC20TokenWrapper extends ContractWrapper {
             eventName,
             blockRange,
             indexFilterValues,
-            artifacts.ERC20Token.compilerOutput.abi,
+            ERC20Token.compilerOutput.abi,
         );
         return logs;
     }
-    // HACK: We don't want this method to be visible to the other units within that package but not to the end user.
-    // TS doesn't give that possibility and therefore we make it private and access it over an any cast. Because of that tslint sees it as unused.
-    // tslint:disable-next-line:no-unused-variable
-    private _invalidateContractInstances(): void {
-        this.unsubscribeAll();
-        this._tokenContractsByAddress = {};
-    }
     private async _getTokenContractAsync(tokenAddress: string): Promise<ERC20TokenContract> {
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         let tokenContract = this._tokenContractsByAddress[normalizedTokenAddress];
         if (!_.isUndefined(tokenContract)) {
             return tokenContract;
         }
-        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
-            artifacts.ERC20Token,
-            normalizedTokenAddress,
-        );
         const contractInstance = new ERC20TokenContract(
-            abi,
-            address,
+            this.abi,
+            normalizedTokenAddress,
             this._web3Wrapper.getProvider(),
             this._web3Wrapper.getContractDefaults(),
         );
diff --git a/packages/contract-wrappers/src/contract_wrappers/erc721_proxy_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/erc721_proxy_wrapper.ts
index 38ecd4687..12758e191 100644
--- a/packages/contract-wrappers/src/contract_wrappers/erc721_proxy_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/erc721_proxy_wrapper.ts
@@ -1,31 +1,42 @@
-import { AssetProxyId } from '@0xproject/types';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { ERC721ProxyContract } from '@0x/abi-gen-wrappers';
+import { ERC721Proxy } from '@0x/contract-artifacts';
+import { AssetProxyId } from '@0x/types';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { ContractAbi } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { artifacts } from '../artifacts';
 import { assert } from '../utils/assert';
+import { _getDefaultContractAddresses } from '../utils/contract_addresses';
 
 import { ContractWrapper } from './contract_wrapper';
-import { ERC721ProxyContract } from './generated/erc721_proxy';
 
 /**
  * This class includes the functionality related to interacting with the ERC721Proxy contract.
  */
 export class ERC721ProxyWrapper extends ContractWrapper {
-    public abi: ContractAbi = artifacts.ERC20Proxy.compilerOutput.abi;
+    public abi: ContractAbi = ERC721Proxy.compilerOutput.abi;
+    public address: string;
     private _erc721ProxyContractIfExists?: ERC721ProxyContract;
-    private _contractAddressIfExists?: string;
-    constructor(web3Wrapper: Web3Wrapper, networkId: number, contractAddressIfExists?: string) {
+    /**
+     * Instantiate ERC721ProxyWrapper
+     * @param web3Wrapper Web3Wrapper instance to use
+     * @param networkId Desired networkId
+     * @param address The address of the ERC721Proxy contract. If undefined,
+     * will default to the known address corresponding to the networkId.
+     */
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, address?: string) {
         super(web3Wrapper, networkId);
-        this._contractAddressIfExists = contractAddressIfExists;
+        this.address = _.isUndefined(address) ? _getDefaultContractAddresses(networkId).erc721Proxy : address;
     }
     /**
      * Get the 4 bytes ID of this asset proxy
      * @return  Proxy id
      */
     public async getProxyIdAsync(): Promise<AssetProxyId> {
-        const ERC721ProxyContractInstance = await this._getERC721ProxyContractAsync();
+        const ERC721ProxyContractInstance = await this._getERC721ProxyContract();
+        // Note(albrow): Below is a TSLint false positive. Code won't compile if
+        // you remove the type assertion.
+        /* tslint:disable-next-line:no-unnecessary-type-assertion */
         const proxyId = (await ERC721ProxyContractInstance.getProxyId.callAsync()) as AssetProxyId;
         return proxyId;
     }
@@ -37,7 +48,7 @@ export class ERC721ProxyWrapper extends ContractWrapper {
     public async isAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
         assert.isETHAddressHex('exchangeContractAddress', exchangeContractAddress);
         const normalizedExchangeContractAddress = exchangeContractAddress.toLowerCase();
-        const ERC721ProxyContractInstance = await this._getERC721ProxyContractAsync();
+        const ERC721ProxyContractInstance = await this._getERC721ProxyContract();
         const isAuthorized = await ERC721ProxyContractInstance.authorized.callAsync(normalizedExchangeContractAddress);
         return isAuthorized;
     }
@@ -46,36 +57,17 @@ export class ERC721ProxyWrapper extends ContractWrapper {
      * @return  The list of authorized addresses.
      */
     public async getAuthorizedAddressesAsync(): Promise<string[]> {
-        const ERC721ProxyContractInstance = await this._getERC721ProxyContractAsync();
+        const ERC721ProxyContractInstance = await this._getERC721ProxyContract();
         const authorizedAddresses = await ERC721ProxyContractInstance.getAuthorizedAddresses.callAsync();
         return authorizedAddresses;
     }
-    /**
-     * Retrieves the Ethereum address of the ERC721Proxy contract deployed on the network
-     * that the user-passed web3 provider is connected to.
-     * @returns The Ethereum address of the ERC721Proxy contract being used.
-     */
-    public getContractAddress(): string {
-        const contractAddress = this._getContractAddress(artifacts.ERC721Proxy, this._contractAddressIfExists);
-        return contractAddress;
-    }
-    // HACK: We don't want this method to be visible to the other units within that package but not to the end user.
-    // TS doesn't give that possibility and therefore we make it private and access it over an any cast. Because of that tslint sees it as unused.
-    // tslint:disable-next-line:no-unused-variable
-    private _invalidateContractInstance(): void {
-        delete this._erc721ProxyContractIfExists;
-    }
-    private async _getERC721ProxyContractAsync(): Promise<ERC721ProxyContract> {
+    private _getERC721ProxyContract(): ERC721ProxyContract {
         if (!_.isUndefined(this._erc721ProxyContractIfExists)) {
             return this._erc721ProxyContractIfExists;
         }
-        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
-            artifacts.ERC721Proxy,
-            this._contractAddressIfExists,
-        );
         const contractInstance = new ERC721ProxyContract(
-            abi,
-            address,
+            this.abi,
+            this.address,
             this._web3Wrapper.getProvider(),
             this._web3Wrapper.getContractDefaults(),
         );
diff --git a/packages/contract-wrappers/src/contract_wrappers/erc721_token_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/erc721_token_wrapper.ts
index 7231e0bde..1610af47b 100644
--- a/packages/contract-wrappers/src/contract_wrappers/erc721_token_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/erc721_token_wrapper.ts
@@ -1,10 +1,11 @@
-import { schemas } from '@0xproject/json-schemas';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { ERC721TokenContract, ERC721TokenEventArgs, ERC721TokenEvents } from '@0x/abi-gen-wrappers';
+import { ERC721Token } from '@0x/contract-artifacts';
+import { schemas } from '@0x/json-schemas';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { ContractAbi, LogWithDecodedArgs } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { artifacts } from '../artifacts';
 import { methodOptsSchema } from '../schemas/method_opts_schema';
 import { txOptsSchema } from '../schemas/tx_opts_schema';
 import {
@@ -17,12 +18,10 @@ import {
 } from '../types';
 import { assert } from '../utils/assert';
 import { constants } from '../utils/constants';
+import { utils } from '../utils/utils';
 
 import { ContractWrapper } from './contract_wrapper';
 import { ERC721ProxyWrapper } from './erc721_proxy_wrapper';
-import { ERC721TokenContract, ERC721TokenEventArgs, ERC721TokenEvents } from './generated/erc721_token';
-
-const removeUndefinedProperties = _.pickBy;
 
 /**
  * This class includes all the functionality related to interacting with ERC721 token contracts.
@@ -30,9 +29,16 @@ const removeUndefinedProperties = _.pickBy;
  * to the 0x ERC721 Proxy smart contract.
  */
 export class ERC721TokenWrapper extends ContractWrapper {
-    public abi: ContractAbi = artifacts.ERC721Token.compilerOutput.abi;
-    private _tokenContractsByAddress: { [address: string]: ERC721TokenContract };
-    private _erc721ProxyWrapper: ERC721ProxyWrapper;
+    public abi: ContractAbi = ERC721Token.compilerOutput.abi;
+    private readonly _tokenContractsByAddress: { [address: string]: ERC721TokenContract };
+    private readonly _erc721ProxyWrapper: ERC721ProxyWrapper;
+    /**
+     * Instantiate ERC721TokenWrapper
+     * @param web3Wrapper Web3Wrapper instance to use
+     * @param networkId Desired networkId
+     * @param erc721ProxyWrapper The ERC721ProxyWrapper instance to use
+     * @param blockPollingIntervalMs The block polling interval to use for active subscriptions
+     */
     constructor(
         web3Wrapper: Web3Wrapper,
         networkId: number,
@@ -143,7 +149,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
         ownerAddress: string,
         methodOpts: MethodOpts = {},
     ): Promise<boolean> {
-        const proxyAddress = this._erc721ProxyWrapper.getContractAddress();
+        const proxyAddress = this._erc721ProxyWrapper.address;
         const isProxyApprovedForAll = await this.isApprovedForAllAsync(
             tokenAddress,
             ownerAddress,
@@ -192,7 +198,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
         tokenId: BigNumber,
         methodOpts: MethodOpts = {},
     ): Promise<boolean> {
-        const proxyAddress = this._erc721ProxyWrapper.getContractAddress();
+        const proxyAddress = this._erc721ProxyWrapper.address;
         const approvedAddress = await this.getApprovedIfExistsAsync(tokenAddress, tokenId, methodOpts);
         const isProxyApproved = approvedAddress === proxyAddress;
         return isProxyApproved;
@@ -228,7 +234,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
         const txHash = await tokenContract.setApprovalForAll.sendTransactionAsync(
             normalizedOperatorAddress,
             isApproved,
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
                 from: normalizedOwnerAddress,
@@ -253,7 +259,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
         isApproved: boolean,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
-        const proxyAddress = this._erc721ProxyWrapper.getContractAddress();
+        const proxyAddress = this._erc721ProxyWrapper.address;
         const txHash = await this.setApprovalForAllAsync(tokenAddress, ownerAddress, proxyAddress, isApproved, txOpts);
         return txHash;
     }
@@ -288,7 +294,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
         const txHash = await tokenContract.approve.sendTransactionAsync(
             normalizedApprovedAddress,
             tokenId,
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
                 from: tokenOwnerAddress,
@@ -311,7 +317,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
         tokenId: BigNumber,
         txOpts: TransactionOpts = {},
     ): Promise<string> {
-        const proxyAddress = this._erc721ProxyWrapper.getContractAddress();
+        const proxyAddress = this._erc721ProxyWrapper.address;
         const txHash = await this.setApprovalAsync(tokenAddress, proxyAddress, tokenId, txOpts);
         return txHash;
     }
@@ -359,7 +365,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
             ownerAddress,
             normalizedReceiverAddress,
             tokenId,
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
                 from: normalizedSenderAddress,
@@ -393,7 +399,7 @@ export class ERC721TokenWrapper extends ContractWrapper {
             normalizedTokenAddress,
             eventName,
             indexFilterValues,
-            artifacts.ERC721Token.compilerOutput.abi,
+            ERC721Token.compilerOutput.abi,
             callback,
             isVerbose,
         );
@@ -438,30 +444,19 @@ export class ERC721TokenWrapper extends ContractWrapper {
             eventName,
             blockRange,
             indexFilterValues,
-            artifacts.ERC721Token.compilerOutput.abi,
+            ERC721Token.compilerOutput.abi,
         );
         return logs;
     }
-    // HACK: We don't want this method to be visible to the other units within that package but not to the end user.
-    // TS doesn't give that possibility and therefore we make it private and access it over an any cast. Because of that tslint sees it as unused.
-    // tslint:disable-next-line:no-unused-variable
-    private _invalidateContractInstances(): void {
-        this.unsubscribeAll();
-        this._tokenContractsByAddress = {};
-    }
     private async _getTokenContractAsync(tokenAddress: string): Promise<ERC721TokenContract> {
         const normalizedTokenAddress = tokenAddress.toLowerCase();
         let tokenContract = this._tokenContractsByAddress[normalizedTokenAddress];
         if (!_.isUndefined(tokenContract)) {
             return tokenContract;
         }
-        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
-            artifacts.ERC721Token,
-            normalizedTokenAddress,
-        );
         const contractInstance = new ERC721TokenContract(
-            abi,
-            address,
+            this.abi,
+            normalizedTokenAddress,
             this._web3Wrapper.getProvider(),
             this._web3Wrapper.getContractDefaults(),
         );
diff --git a/packages/contract-wrappers/src/contract_wrappers/ether_token_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/ether_token_wrapper.ts
index 5046d3667..913c47cf7 100644
--- a/packages/contract-wrappers/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/ether_token_wrapper.ts
@@ -1,29 +1,35 @@
-import { schemas } from '@0xproject/json-schemas';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { WETH9Contract, WETH9EventArgs, WETH9Events } from '@0x/abi-gen-wrappers';
+import { WETH9 } from '@0x/contract-artifacts';
+import { schemas } from '@0x/json-schemas';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { ContractAbi, LogWithDecodedArgs } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { artifacts } from '../artifacts';
 import { BlockRange, ContractWrappersError, EventCallback, IndexedFilterValues, TransactionOpts } from '../types';
 import { assert } from '../utils/assert';
+import { utils } from '../utils/utils';
 
 import { ContractWrapper } from './contract_wrapper';
 import { ERC20TokenWrapper } from './erc20_token_wrapper';
-import { WETH9Contract, WETH9EventArgs, WETH9Events } from './generated/weth9';
-
-const removeUndefinedProperties = _.pickBy;
 
 /**
  * This class includes all the functionality related to interacting with a wrapped Ether ERC20 token contract.
  * The caller can convert ETH into the equivalent number of wrapped ETH ERC20 tokens and back.
  */
 export class EtherTokenWrapper extends ContractWrapper {
-    public abi: ContractAbi = artifacts.EtherToken.compilerOutput.abi;
-    private _etherTokenContractsByAddress: {
+    public abi: ContractAbi = WETH9.compilerOutput.abi;
+    private readonly _etherTokenContractsByAddress: {
         [address: string]: WETH9Contract;
     } = {};
-    private _erc20TokenWrapper: ERC20TokenWrapper;
+    private readonly _erc20TokenWrapper: ERC20TokenWrapper;
+    /**
+     * Instantiate EtherTokenWrapper.
+     * @param web3Wrapper Web3Wrapper instance to use
+     * @param networkId Desired networkId
+     * @param erc20TokenWrapper The ERC20TokenWrapper instance to use
+     * @param blockPollingIntervalMs The block polling interval to use for active subscriptions
+     */
     constructor(
         web3Wrapper: Web3Wrapper,
         networkId: number,
@@ -60,7 +66,7 @@ export class EtherTokenWrapper extends ContractWrapper {
 
         const wethContract = await this._getEtherTokenContractAsync(normalizedEtherTokenAddress);
         const txHash = await wethContract.deposit.sendTransactionAsync(
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 from: normalizedDepositorAddress,
                 value: amountInWei,
                 gas: txOpts.gasLimit,
@@ -102,7 +108,7 @@ export class EtherTokenWrapper extends ContractWrapper {
         const wethContract = await this._getEtherTokenContractAsync(normalizedEtherTokenAddress);
         const txHash = await wethContract.withdraw.sendTransactionAsync(
             amountInWei,
-            removeUndefinedProperties({
+            utils.removeUndefinedProperties({
                 from: normalizedWithdrawerAddress,
                 gas: txOpts.gasLimit,
                 gasPrice: txOpts.gasPrice,
@@ -135,7 +141,7 @@ export class EtherTokenWrapper extends ContractWrapper {
             eventName,
             blockRange,
             indexFilterValues,
-            artifacts.EtherToken.compilerOutput.abi,
+            WETH9.compilerOutput.abi,
         );
         return logs;
     }
@@ -165,7 +171,7 @@ export class EtherTokenWrapper extends ContractWrapper {
             normalizedEtherTokenAddress,
             eventName,
             indexFilterValues,
-            artifacts.EtherToken.compilerOutput.abi,
+            WETH9.compilerOutput.abi,
             callback,
             isVerbose,
         );
@@ -185,36 +191,14 @@ export class EtherTokenWrapper extends ContractWrapper {
     public unsubscribeAll(): void {
         super._unsubscribeAll();
     }
-    /**
-     * Retrieves the Ethereum address of the EtherToken contract deployed on the network
-     * that the user-passed web3 provider is connected to. If it's not Kovan, Ropsten, Rinkeby, Mainnet or TestRPC
-     * (networkId: 50), it will return undefined (e.g a private network).
-     * @returns The Ethereum address of the EtherToken contract or undefined.
-     */
-    public getContractAddressIfExists(): string | undefined {
-        const networkSpecificArtifact = artifacts.EtherToken.networks[this._networkId];
-        const contractAddressIfExists = _.isUndefined(networkSpecificArtifact)
-            ? undefined
-            : networkSpecificArtifact.address;
-        return contractAddressIfExists;
-    }
-    // tslint:disable-next-line:no-unused-variable
-    private _invalidateContractInstance(): void {
-        this.unsubscribeAll();
-        this._etherTokenContractsByAddress = {};
-    }
     private async _getEtherTokenContractAsync(etherTokenAddress: string): Promise<WETH9Contract> {
         let etherTokenContract = this._etherTokenContractsByAddress[etherTokenAddress];
         if (!_.isUndefined(etherTokenContract)) {
             return etherTokenContract;
         }
-        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
-            artifacts.EtherToken,
-            etherTokenAddress,
-        );
         const contractInstance = new WETH9Contract(
-            abi,
-            address,
+            this.abi,
+            etherTokenAddress,
             this._web3Wrapper.getProvider(),
             this._web3Wrapper.getContractDefaults(),
         );
diff --git a/packages/contract-wrappers/src/contract_wrappers/exchange_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/exchange_wrapper.ts
index 5a4b40547..2e978f35b 100644
--- a/packages/contract-wrappers/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/exchange_wrapper.ts
@@ -1,12 +1,20 @@
-import { schemas } from '@0xproject/json-schemas';
-import { assetDataUtils } from '@0xproject/order-utils';
-import { AssetProxyId, Order, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { ContractAbi, LogWithDecodedArgs } from 'ethereum-types';
+import { ExchangeContract, ExchangeEventArgs, ExchangeEvents } from '@0x/abi-gen-wrappers';
+import { Exchange } from '@0x/contract-artifacts';
+import { schemas } from '@0x/json-schemas';
+import {
+    assetDataUtils,
+    BalanceAndProxyAllowanceLazyStore,
+    ExchangeTransferSimulator,
+    OrderValidationUtils,
+} from '@0x/order-utils';
+import { AssetProxyId, Order, SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import { BlockParamLiteral, ContractAbi, LogWithDecodedArgs } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { artifacts } from '../artifacts';
+import { AssetBalanceAndProxyAllowanceFetcher } from '../fetchers/asset_balance_and_proxy_allowance_fetcher';
+import { OrderFilledCancelledFetcher } from '../fetchers/order_filled_cancelled_fetcher';
 import { methodOptsSchema } from '../schemas/method_opts_schema';
 import { orderTxOptsSchema } from '../schemas/order_tx_opts_schema';
 import { txOptsSchema } from '../schemas/tx_opts_schema';
@@ -18,33 +26,57 @@ import {
     MethodOpts,
     OrderInfo,
     OrderTransactionOpts,
+    ValidateOrderFillableOpts,
 } from '../types';
 import { assert } from '../utils/assert';
+import { _getDefaultContractAddresses } from '../utils/contract_addresses';
 import { decorators } from '../utils/decorators';
 import { TransactionEncoder } from '../utils/transaction_encoder';
 
 import { ContractWrapper } from './contract_wrapper';
-import { ExchangeContract, ExchangeEventArgs, ExchangeEvents } from './generated/exchange';
+import { ERC20TokenWrapper } from './erc20_token_wrapper';
+import { ERC721TokenWrapper } from './erc721_token_wrapper';
 
 /**
  * This class includes all the functionality related to calling methods, sending transactions and subscribing to
  * events of the 0x V2 Exchange smart contract.
  */
 export class ExchangeWrapper extends ContractWrapper {
-    public abi: ContractAbi = artifacts.Exchange.compilerOutput.abi;
+    public abi: ContractAbi = Exchange.compilerOutput.abi;
+    public address: string;
+    public zrxTokenAddress: string;
     private _exchangeContractIfExists?: ExchangeContract;
-    private _contractAddressIfExists?: string;
-    private _zrxContractAddressIfExists?: string;
+    private readonly _erc721TokenWrapper: ERC721TokenWrapper;
+    private readonly _erc20TokenWrapper: ERC20TokenWrapper;
+    /**
+     * Instantiate ExchangeWrapper
+     * @param web3Wrapper Web3Wrapper instance to use.
+     * @param networkId Desired networkId.
+     * @param erc20TokenWrapper ERC20TokenWrapper instance to use.
+     * @param erc721TokenWrapper ERC721TokenWrapper instance to use.
+     * @param address The address of the Exchange contract. If undefined, will
+     * default to the known address corresponding to the networkId.
+     * @param zrxTokenAddress The address of the ZRXToken contract. If
+     * undefined, will default to the known address corresponding to the
+     * networkId.
+     * @param blockPollingIntervalMs The block polling interval to use for active subscriptions.
+     */
     constructor(
         web3Wrapper: Web3Wrapper,
         networkId: number,
-        contractAddressIfExists?: string,
-        zrxContractAddressIfExists?: string,
+        erc20TokenWrapper: ERC20TokenWrapper,
+        erc721TokenWrapper: ERC721TokenWrapper,
+        address?: string,
+        zrxTokenAddress?: string,
         blockPollingIntervalMs?: number,
     ) {
         super(web3Wrapper, networkId, blockPollingIntervalMs);
-        this._contractAddressIfExists = contractAddressIfExists;
-        this._zrxContractAddressIfExists = zrxContractAddressIfExists;
+        this._erc20TokenWrapper = erc20TokenWrapper;
+        this._erc721TokenWrapper = erc721TokenWrapper;
+        this.address = _.isUndefined(address) ? _getDefaultContractAddresses(networkId).exchange : address;
+        this.zrxTokenAddress = _.isUndefined(zrxTokenAddress)
+            ? _getDefaultContractAddresses(networkId).zrxToken
+            : zrxTokenAddress;
     }
     /**
      * Retrieve the address of an asset proxy by signature.
@@ -666,6 +698,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @param leftSignedOrder  First order to match.
      * @param rightSignedOrder Second order to match.
      * @param takerAddress     The address that sends the transaction and gets the spread.
+     * @param orderTransactionOpts Optional arguments this method accepts.
      * @return Transaction hash.
      */
     @decorators.asyncZeroExErrorHandler
@@ -724,6 +757,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @param signerAddress Address that should have signed the given hash.
      * @param signature     Proof that the hash has been signed by signer.
      * @param senderAddress Address that should send the transaction.
+     * @param orderTransactionOpts Optional arguments this method accepts.
      * @returns Transaction hash.
      */
     @decorators.asyncZeroExErrorHandler
@@ -902,7 +936,7 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Cancel a given order.
      * @param   order           An object that conforms to the Order or SignedOrder interface. The order you would like to cancel.
-     * @param   transactionOpts Optional arguments this method accepts.
+     * @param   orderTransactionOpts Optional arguments this method accepts.
      * @return  Transaction hash.
      */
     @decorators.asyncZeroExErrorHandler
@@ -1022,12 +1056,11 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesBelongToStringEnum('eventName', eventName, ExchangeEvents);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
         assert.isFunction('callback', callback);
-        const exchangeContractAddress = this.getContractAddress();
         const subscriptionToken = this._subscribe<ArgsType>(
-            exchangeContractAddress,
+            this.address,
             eventName,
             indexFilterValues,
-            artifacts.Exchange.compilerOutput.abi,
+            Exchange.compilerOutput.abi,
             callback,
             isVerbose,
         );
@@ -1062,40 +1095,79 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesBelongToStringEnum('eventName', eventName, ExchangeEvents);
         assert.doesConformToSchema('blockRange', blockRange, schemas.blockRangeSchema);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
-        const exchangeContractAddress = this.getContractAddress();
         const logs = await this._getLogsAsync<ArgsType>(
-            exchangeContractAddress,
+            this.address,
             eventName,
             blockRange,
             indexFilterValues,
-            artifacts.Exchange.compilerOutput.abi,
+            Exchange.compilerOutput.abi,
         );
         return logs;
     }
     /**
-     * Retrieves the Ethereum address of the Exchange contract deployed on the network
-     * that the user-passed web3 provider is connected to.
-     * @returns The Ethereum address of the Exchange contract being used.
+     * Validate if the supplied order is fillable, and throw if it isn't
+     * @param signedOrder SignedOrder of interest
+     * @param opts ValidateOrderFillableOpts options (e.g expectedFillTakerTokenAmount.
+     * If it isn't supplied, we check if the order is fillable for a non-zero amount)
      */
-    public getContractAddress(): string {
-        const contractAddress = this._getContractAddress(artifacts.Exchange, this._contractAddressIfExists);
-        return contractAddress;
+    public async validateOrderFillableOrThrowAsync(
+        signedOrder: SignedOrder,
+        opts: ValidateOrderFillableOpts = {},
+    ): Promise<void> {
+        const balanceAllowanceFetcher = new AssetBalanceAndProxyAllowanceFetcher(
+            this._erc20TokenWrapper,
+            this._erc721TokenWrapper,
+            BlockParamLiteral.Latest,
+        );
+        const balanceAllowanceStore = new BalanceAndProxyAllowanceLazyStore(balanceAllowanceFetcher);
+        const exchangeTradeSimulator = new ExchangeTransferSimulator(balanceAllowanceStore);
+
+        const expectedFillTakerTokenAmountIfExists = opts.expectedFillTakerTokenAmount;
+        const filledCancelledFetcher = new OrderFilledCancelledFetcher(this, BlockParamLiteral.Latest);
+        const orderValidationUtils = new OrderValidationUtils(filledCancelledFetcher);
+        await orderValidationUtils.validateOrderFillableOrThrowAsync(
+            exchangeTradeSimulator,
+            signedOrder,
+            this.getZRXAssetData(),
+            expectedFillTakerTokenAmountIfExists,
+        );
     }
     /**
-     * Returns the ZRX token address used by the exchange contract.
-     * @return Address of ZRX token
+     * Validate a call to FillOrder and throw if it wouldn't succeed
+     * @param signedOrder SignedOrder of interest
+     * @param fillTakerAssetAmount Amount we'd like to fill the order for
+     * @param takerAddress The taker of the order
      */
-    public getZRXTokenAddress(): string {
-        const contractAddress = this._getContractAddress(artifacts.ZRXToken, this._zrxContractAddressIfExists);
-        return contractAddress;
+    public async validateFillOrderThrowIfInvalidAsync(
+        signedOrder: SignedOrder,
+        fillTakerAssetAmount: BigNumber,
+        takerAddress: string,
+    ): Promise<void> {
+        const balanceAllowanceFetcher = new AssetBalanceAndProxyAllowanceFetcher(
+            this._erc20TokenWrapper,
+            this._erc721TokenWrapper,
+            BlockParamLiteral.Latest,
+        );
+        const balanceAllowanceStore = new BalanceAndProxyAllowanceLazyStore(balanceAllowanceFetcher);
+        const exchangeTradeSimulator = new ExchangeTransferSimulator(balanceAllowanceStore);
+
+        const filledCancelledFetcher = new OrderFilledCancelledFetcher(this, BlockParamLiteral.Latest);
+        const orderValidationUtils = new OrderValidationUtils(filledCancelledFetcher);
+        await orderValidationUtils.validateFillOrderThrowIfInvalidAsync(
+            exchangeTradeSimulator,
+            this._web3Wrapper.getProvider(),
+            signedOrder,
+            fillTakerAssetAmount,
+            takerAddress,
+            this.getZRXAssetData(),
+        );
     }
     /**
      * Returns the ZRX asset data used by the exchange contract.
      * @return ZRX asset data
      */
     public getZRXAssetData(): string {
-        const zrxTokenAddress = this.getZRXTokenAddress();
-        const zrxAssetData = assetDataUtils.encodeERC20AssetData(zrxTokenAddress);
+        const zrxAssetData = assetDataUtils.encodeERC20AssetData(this.zrxTokenAddress);
         return zrxAssetData;
     }
     /**
@@ -1108,23 +1180,14 @@ export class ExchangeWrapper extends ContractWrapper {
         const encoder = new TransactionEncoder(exchangeInstance);
         return encoder;
     }
-    // tslint:disable:no-unused-variable
-    private _invalidateContractInstances(): void {
-        this.unsubscribeAll();
-        delete this._exchangeContractIfExists;
-    }
     // tslint:enable:no-unused-variable
     private async _getExchangeContractAsync(): Promise<ExchangeContract> {
         if (!_.isUndefined(this._exchangeContractIfExists)) {
             return this._exchangeContractIfExists;
         }
-        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
-            artifacts.Exchange,
-            this._contractAddressIfExists,
-        );
         const contractInstance = new ExchangeContract(
-            abi,
-            address,
+            this.abi,
+            this.address,
             this._web3Wrapper.getProvider(),
             this._web3Wrapper.getContractDefaults(),
         );
diff --git a/packages/contract-wrappers/src/contract_wrappers/forwarder_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/forwarder_wrapper.ts
index 13ef0fe01..80742e030 100644
--- a/packages/contract-wrappers/src/contract_wrappers/forwarder_wrapper.ts
+++ b/packages/contract-wrappers/src/contract_wrappers/forwarder_wrapper.ts
@@ -1,101 +1,145 @@
-import { schemas } from '@0xproject/json-schemas';
-import { AssetProxyId, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { ForwarderContract } from '@0x/abi-gen-wrappers';
+import { Forwarder } from '@0x/contract-artifacts';
+import { schemas } from '@0x/json-schemas';
+import { SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { ContractAbi } from 'ethereum-types';
 import * as _ from 'lodash';
 
-import { artifacts } from '../artifacts';
 import { orderTxOptsSchema } from '../schemas/order_tx_opts_schema';
 import { txOptsSchema } from '../schemas/tx_opts_schema';
-import { TransactionOpts } from '../types';
+import { OrderTransactionOpts } from '../types';
 import { assert } from '../utils/assert';
 import { calldataOptimizationUtils } from '../utils/calldata_optimization_utils';
 import { constants } from '../utils/constants';
+import { _getDefaultContractAddresses } from '../utils/contract_addresses';
+import { decorators } from '../utils/decorators';
+import { utils } from '../utils/utils';
 
 import { ContractWrapper } from './contract_wrapper';
-import { ForwarderContract } from './generated/forwarder';
 
 /**
  * This class includes the functionality related to interacting with the Forwarder contract.
  */
 export class ForwarderWrapper extends ContractWrapper {
-    public abi: ContractAbi = artifacts.Forwarder.compilerOutput.abi;
+    public abi: ContractAbi = Forwarder.compilerOutput.abi;
+    public address: string;
+    public zrxTokenAddress: string;
+    public etherTokenAddress: string;
     private _forwarderContractIfExists?: ForwarderContract;
-    private _contractAddressIfExists?: string;
-    private _zrxContractAddressIfExists?: string;
+
+    /**
+     * Instantiate ForwarderWrapper
+     * @param web3Wrapper Web3Wrapper instance to use.
+     * @param networkId Desired networkId.
+     * @param address The address of the Exchange contract. If undefined, will
+     * default to the known address corresponding to the networkId.
+     * @param zrxTokenAddress The address of the ZRXToken contract. If
+     * undefined, will default to the known address corresponding to the
+     * networkId.
+     * @param etherTokenAddress The address of a WETH (Ether token) contract. If
+     * undefined, will default to the known address corresponding to the
+     * networkId.
+     */
     constructor(
         web3Wrapper: Web3Wrapper,
         networkId: number,
-        contractAddressIfExists?: string,
-        zrxContractAddressIfExists?: string,
+        address?: string,
+        zrxTokenAddress?: string,
+        etherTokenAddress?: string,
     ) {
         super(web3Wrapper, networkId);
-        this._contractAddressIfExists = contractAddressIfExists;
-        this._zrxContractAddressIfExists = zrxContractAddressIfExists;
+        this.address = _.isUndefined(address) ? _getDefaultContractAddresses(networkId).exchange : address;
+        this.zrxTokenAddress = _.isUndefined(zrxTokenAddress)
+            ? _getDefaultContractAddresses(networkId).zrxToken
+            : zrxTokenAddress;
+        this.etherTokenAddress = _.isUndefined(etherTokenAddress)
+            ? _getDefaultContractAddresses(networkId).etherToken
+            : etherTokenAddress;
     }
     /**
      * 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   signedOrders         An array of objects that conform to the SignedOrder interface. All orders must specify the same makerAsset.
-     *                               All orders must specify WETH as the takerAsset
-     * @param   takerAddress         The user Ethereum address who would like to fill this order. Must be available via the supplied
-     *                               Provider provided at instantiation.
-     * @param   ethAmount            The amount of eth to send with the transaction (in wei).
-     * @param   signedFeeOrders      An array of objects that conform to the SignedOrder interface. All orders must specify ZRX as makerAsset and WETH as takerAsset.
-     *                               Used to purchase ZRX for primary order fees.
-     * @param   feePercentage        The percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-     *                               Defaults to 0.
-     * @param   feeRecipientAddress  The address that will receive ETH when signedFeeOrders are filled.
-     * @param   txOpts               Transaction parameters.
+     * @param   signedOrders            An array of objects that conform to the SignedOrder interface. All orders must specify the same makerAsset.
+     *                                  All orders must specify WETH as the takerAsset
+     * @param   takerAddress            The user Ethereum address who would like to fill this order. Must be available via the supplied
+     *                                  Provider provided at instantiation.
+     * @param   ethAmount               The amount of eth to send with the transaction (in wei).
+     * @param   signedFeeOrders         An array of objects that conform to the SignedOrder interface. All orders must specify ZRX as makerAsset and WETH as takerAsset.
+     *                                  Used to purchase ZRX for primary order fees.
+     * @param   feePercentage           The percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
+     *                                  Defaults to 0.
+     * @param   feeRecipientAddress     The address that will receive ETH when signedFeeOrders are filled.
+     * @param   orderTransactionOpts    Transaction parameters.
      * @return  Transaction hash.
      */
+    @decorators.asyncZeroExErrorHandler
     public async marketSellOrdersWithEthAsync(
         signedOrders: SignedOrder[],
         takerAddress: string,
         ethAmount: BigNumber,
         signedFeeOrders: SignedOrder[] = [],
-        feePercentage: BigNumber = constants.ZERO_AMOUNT,
+        feePercentage: number = 0,
         feeRecipientAddress: string = constants.NULL_ADDRESS,
-        txOpts: TransactionOpts = {},
+        orderTransactionOpts: OrderTransactionOpts = { shouldValidate: true },
     ): Promise<string> {
         // type assertions
         assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         assert.isBigNumber('ethAmount', ethAmount);
         assert.doesConformToSchema('signedFeeOrders', signedFeeOrders, schemas.signedOrdersSchema);
-        assert.isBigNumber('feePercentage', feePercentage);
+        assert.isNumber('feePercentage', feePercentage);
         assert.isETHAddressHex('feeRecipientAddress', feeRecipientAddress);
-        assert.doesConformToSchema('txOpts', txOpts, txOptsSchema);
+        assert.doesConformToSchema('orderTransactionOpts', orderTransactionOpts, orderTxOptsSchema, [txOptsSchema]);
         // other assertions
-        assert.ordersCanBeUsedForForwarderContract(signedOrders, this.getEtherTokenAddress());
-        assert.feeOrdersCanBeUsedForForwarderContract(
-            signedFeeOrders,
-            this.getZRXTokenAddress(),
-            this.getEtherTokenAddress(),
-        );
+        assert.ordersCanBeUsedForForwarderContract(signedOrders, this.etherTokenAddress);
+        assert.feeOrdersCanBeUsedForForwarderContract(signedFeeOrders, this.zrxTokenAddress, this.etherTokenAddress);
+        // format feePercentage
+        const formattedFeePercentage = utils.numberPercentageToEtherTokenAmountPercentage(feePercentage);
         // lowercase input addresses
         const normalizedTakerAddress = takerAddress.toLowerCase();
         const normalizedFeeRecipientAddress = feeRecipientAddress.toLowerCase();
         // optimize orders
         const optimizedMarketOrders = calldataOptimizationUtils.optimizeForwarderOrders(signedOrders);
         const optimizedFeeOrders = calldataOptimizationUtils.optimizeForwarderFeeOrders(signedFeeOrders);
-        // send transaction
+        // compile signatures
+        const signatures = _.map(optimizedMarketOrders, order => order.signature);
+        const feeSignatures = _.map(optimizedFeeOrders, order => order.signature);
+        // get contract
         const forwarderContractInstance = await this._getForwarderContractAsync();
+        // validate transaction
+        if (orderTransactionOpts.shouldValidate) {
+            await forwarderContractInstance.marketSellOrdersWithEth.callAsync(
+                optimizedMarketOrders,
+                signatures,
+                optimizedFeeOrders,
+                feeSignatures,
+                formattedFeePercentage,
+                normalizedFeeRecipientAddress,
+                {
+                    value: ethAmount,
+                    from: normalizedTakerAddress,
+                    gas: orderTransactionOpts.gasLimit,
+                    gasPrice: orderTransactionOpts.gasPrice,
+                },
+            );
+        }
+        // send transaction
         const txHash = await forwarderContractInstance.marketSellOrdersWithEth.sendTransactionAsync(
             optimizedMarketOrders,
-            _.map(optimizedMarketOrders, order => order.signature),
+            signatures,
             optimizedFeeOrders,
-            _.map(optimizedFeeOrders, order => order.signature),
-            feePercentage,
+            feeSignatures,
+            formattedFeePercentage,
             feeRecipientAddress,
             {
                 value: ethAmount,
                 from: normalizedTakerAddress,
-                gas: txOpts.gasLimit,
-                gasPrice: txOpts.gasPrice,
+                gas: orderTransactionOpts.gasLimit,
+                gasPrice: orderTransactionOpts.gasPrice,
             },
         );
         return txHash;
@@ -104,29 +148,30 @@ export class ForwarderWrapper extends ContractWrapper {
      * Attempt to purchase makerAssetFillAmount of makerAsset by selling ethAmount provided with transaction.
      * Any ZRX required to pay fees for primary orders will automatically be purchased by the contract.
      * Any ETH not spent will be refunded to sender.
-     * @param   signedOrders         An array of objects that conform to the SignedOrder interface. All orders must specify the same makerAsset.
-     *                               All orders must specify WETH as the takerAsset
-     * @param   makerAssetFillAmount The amount of the order (in taker asset baseUnits) that you wish to fill.
-     * @param   takerAddress         The user Ethereum address who would like to fill this order. Must be available via the supplied
-     *                               Provider provided at instantiation.
-     * @param   ethAmount            The amount of eth to send with the transaction (in wei).
-     * @param   signedFeeOrders      An array of objects that conform to the SignedOrder interface. All orders must specify ZRX as makerAsset and WETH as takerAsset.
-     *                               Used to purchase ZRX for primary order fees.
-     * @param   feePercentage        The percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
-     *                               Defaults to 0.
-     * @param   feeRecipientAddress  The address that will receive ETH when signedFeeOrders are filled.
-     * @param   txOpts               Transaction parameters.
+     * @param   signedOrders            An array of objects that conform to the SignedOrder interface. All orders must specify the same makerAsset.
+     *                                  All orders must specify WETH as the takerAsset
+     * @param   makerAssetFillAmount    The amount of the order (in taker asset baseUnits) that you wish to fill.
+     * @param   takerAddress            The user Ethereum address who would like to fill this order. Must be available via the supplied
+     *                                  Provider provided at instantiation.
+     * @param   ethAmount               The amount of eth to send with the transaction (in wei).
+     * @param   signedFeeOrders         An array of objects that conform to the SignedOrder interface. All orders must specify ZRX as makerAsset and WETH as takerAsset.
+     *                                  Used to purchase ZRX for primary order fees.
+     * @param   feePercentage           The percentage of WETH sold that will payed as fee to forwarding contract feeRecipient.
+     *                                  Defaults to 0.
+     * @param   feeRecipientAddress     The address that will receive ETH when signedFeeOrders are filled.
+     * @param   orderTransactionOpts    Transaction parameters.
      * @return  Transaction hash.
      */
+    @decorators.asyncZeroExErrorHandler
     public async marketBuyOrdersWithEthAsync(
         signedOrders: SignedOrder[],
         makerAssetFillAmount: BigNumber,
         takerAddress: string,
         ethAmount: BigNumber,
         signedFeeOrders: SignedOrder[] = [],
-        feePercentage: BigNumber = constants.ZERO_AMOUNT,
+        feePercentage: number = 0,
         feeRecipientAddress: string = constants.NULL_ADDRESS,
-        txOpts: TransactionOpts = {},
+        orderTransactionOpts: OrderTransactionOpts = { shouldValidate: true },
     ): Promise<string> {
         // type assertions
         assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
@@ -134,83 +179,68 @@ export class ForwarderWrapper extends ContractWrapper {
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         assert.isBigNumber('ethAmount', ethAmount);
         assert.doesConformToSchema('signedFeeOrders', signedFeeOrders, schemas.signedOrdersSchema);
-        assert.isBigNumber('feePercentage', feePercentage);
+        assert.isNumber('feePercentage', feePercentage);
         assert.isETHAddressHex('feeRecipientAddress', feeRecipientAddress);
-        assert.doesConformToSchema('txOpts', txOpts, txOptsSchema);
+        assert.doesConformToSchema('orderTransactionOpts', orderTransactionOpts, orderTxOptsSchema, [txOptsSchema]);
         // other assertions
-        assert.ordersCanBeUsedForForwarderContract(signedOrders, this.getEtherTokenAddress());
-        assert.feeOrdersCanBeUsedForForwarderContract(
-            signedFeeOrders,
-            this.getZRXTokenAddress(),
-            this.getEtherTokenAddress(),
-        );
+        assert.ordersCanBeUsedForForwarderContract(signedOrders, this.etherTokenAddress);
+        assert.feeOrdersCanBeUsedForForwarderContract(signedFeeOrders, this.zrxTokenAddress, this.etherTokenAddress);
+        // format feePercentage
+        const formattedFeePercentage = utils.numberPercentageToEtherTokenAmountPercentage(feePercentage);
         // lowercase input addresses
         const normalizedTakerAddress = takerAddress.toLowerCase();
         const normalizedFeeRecipientAddress = feeRecipientAddress.toLowerCase();
         // optimize orders
         const optimizedMarketOrders = calldataOptimizationUtils.optimizeForwarderOrders(signedOrders);
         const optimizedFeeOrders = calldataOptimizationUtils.optimizeForwarderFeeOrders(signedFeeOrders);
-        // send transaction
+        // compile signatures
+        const signatures = _.map(optimizedMarketOrders, order => order.signature);
+        const feeSignatures = _.map(optimizedFeeOrders, order => order.signature);
+        // get contract
         const forwarderContractInstance = await this._getForwarderContractAsync();
+        // validate transaction
+        if (orderTransactionOpts.shouldValidate) {
+            await forwarderContractInstance.marketBuyOrdersWithEth.callAsync(
+                optimizedMarketOrders,
+                makerAssetFillAmount,
+                signatures,
+                optimizedFeeOrders,
+                feeSignatures,
+                formattedFeePercentage,
+                normalizedFeeRecipientAddress,
+                {
+                    value: ethAmount,
+                    from: normalizedTakerAddress,
+                    gas: orderTransactionOpts.gasLimit,
+                    gasPrice: orderTransactionOpts.gasPrice,
+                },
+            );
+        }
+        // send transaction
         const txHash = await forwarderContractInstance.marketBuyOrdersWithEth.sendTransactionAsync(
             optimizedMarketOrders,
             makerAssetFillAmount,
-            _.map(optimizedMarketOrders, order => order.signature),
+            signatures,
             optimizedFeeOrders,
-            _.map(optimizedFeeOrders, order => order.signature),
-            feePercentage,
+            feeSignatures,
+            formattedFeePercentage,
             feeRecipientAddress,
             {
                 value: ethAmount,
                 from: normalizedTakerAddress,
-                gas: txOpts.gasLimit,
-                gasPrice: txOpts.gasPrice,
+                gas: orderTransactionOpts.gasLimit,
+                gasPrice: orderTransactionOpts.gasPrice,
             },
         );
         return txHash;
     }
-    /**
-     * Retrieves the Ethereum address of the Forwarder contract deployed on the network
-     * that the user-passed web3 provider is connected to.
-     * @returns The Ethereum address of the Forwarder contract being used.
-     */
-    public getContractAddress(): string {
-        const contractAddress = this._getContractAddress(artifacts.Forwarder, this._contractAddressIfExists);
-        return contractAddress;
-    }
-    /**
-     * Returns the ZRX token address used by the forwarder contract.
-     * @return Address of ZRX token
-     */
-    public getZRXTokenAddress(): string {
-        const contractAddress = this._getContractAddress(artifacts.ZRXToken, this._zrxContractAddressIfExists);
-        return contractAddress;
-    }
-    /**
-     * Returns the Ether token address used by the forwarder contract.
-     * @return Address of Ether token
-     */
-    public getEtherTokenAddress(): string {
-        const contractAddress = this._getContractAddress(artifacts.EtherToken);
-        return contractAddress;
-    }
-    // HACK: We don't want this method to be visible to the other units within that package but not to the end user.
-    // TS doesn't give that possibility and therefore we make it private and access it over an any cast. Because of that tslint sees it as unused.
-    // tslint:disable-next-line:no-unused-variable
-    private _invalidateContractInstance(): void {
-        delete this._forwarderContractIfExists;
-    }
     private async _getForwarderContractAsync(): Promise<ForwarderContract> {
         if (!_.isUndefined(this._forwarderContractIfExists)) {
             return this._forwarderContractIfExists;
         }
-        const [abi, address] = await this._getContractAbiAndAddressFromArtifactsAsync(
-            artifacts.Forwarder,
-            this._contractAddressIfExists,
-        );
         const contractInstance = new ForwarderContract(
-            abi,
-            address,
+            this.abi,
+            this.address,
             this._web3Wrapper.getProvider(),
             this._web3Wrapper.getContractDefaults(),
         );
diff --git a/packages/contract-wrappers/src/contract_wrappers/order_validator_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/order_validator_wrapper.ts
new file mode 100644
index 000000000..c186e080e
--- /dev/null
+++ b/packages/contract-wrappers/src/contract_wrappers/order_validator_wrapper.ts
@@ -0,0 +1,185 @@
+import { OrderValidatorContract } from '@0x/abi-gen-wrappers';
+import { OrderValidator } from '@0x/contract-artifacts';
+import { schemas } from '@0x/json-schemas';
+import { SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import { ContractAbi } from 'ethereum-types';
+import * as _ from 'lodash';
+
+import { BalanceAndAllowance, OrderAndTraderInfo, TraderInfo } from '../types';
+import { assert } from '../utils/assert';
+import { _getDefaultContractAddresses } from '../utils/contract_addresses';
+
+import { ContractWrapper } from './contract_wrapper';
+
+/**
+ * This class includes the functionality related to interacting with the OrderValidator contract.
+ */
+export class OrderValidatorWrapper extends ContractWrapper {
+    public abi: ContractAbi = OrderValidator.compilerOutput.abi;
+    public address: string;
+    private _orderValidatorContractIfExists?: OrderValidatorContract;
+    /**
+     * Instantiate OrderValidatorWrapper
+     * @param web3Wrapper Web3Wrapper instance to use.
+     * @param networkId Desired networkId.
+     * @param address The address of the OrderValidator contract. If undefined,
+     * will default to the known address corresponding to the networkId.
+     */
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, address?: string) {
+        super(web3Wrapper, networkId);
+        this.address = _.isUndefined(address) ? _getDefaultContractAddresses(networkId).exchange : address;
+    }
+    /**
+     * Get an object conforming to OrderAndTraderInfo containing on-chain information of the provided order and address
+     * @param   order           An object conforming to SignedOrder
+     * @param   takerAddress    An ethereum address
+     * @return  OrderAndTraderInfo
+     */
+    public async getOrderAndTraderInfoAsync(order: SignedOrder, takerAddress: string): Promise<OrderAndTraderInfo> {
+        assert.doesConformToSchema('order', order, schemas.signedOrderSchema);
+        assert.isETHAddressHex('takerAddress', takerAddress);
+        const OrderValidatorContractInstance = await this._getOrderValidatorContractAsync();
+        const orderAndTraderInfo = await OrderValidatorContractInstance.getOrderAndTraderInfo.callAsync(
+            order,
+            takerAddress,
+        );
+        const result = {
+            orderInfo: orderAndTraderInfo[0],
+            traderInfo: orderAndTraderInfo[1],
+        };
+        return result;
+    }
+    /**
+     * Get an array of objects conforming to OrderAndTraderInfo containing on-chain information of the provided orders and addresses
+     * @param   orders          An array of objects conforming to SignedOrder
+     * @param   takerAddresses  An array of ethereum addresses
+     * @return  array of OrderAndTraderInfo
+     */
+    public async getOrdersAndTradersInfoAsync(
+        orders: SignedOrder[],
+        takerAddresses: string[],
+    ): Promise<OrderAndTraderInfo[]> {
+        assert.doesConformToSchema('orders', orders, schemas.signedOrdersSchema);
+        _.forEach(takerAddresses, (takerAddress, index) =>
+            assert.isETHAddressHex(`takerAddresses[${index}]`, takerAddress),
+        );
+        assert.assert(orders.length === takerAddresses.length, 'Expected orders.length to equal takerAddresses.length');
+        const OrderValidatorContractInstance = await this._getOrderValidatorContractAsync();
+        const ordersAndTradersInfo = await OrderValidatorContractInstance.getOrdersAndTradersInfo.callAsync(
+            orders,
+            takerAddresses,
+        );
+        const orderInfos = ordersAndTradersInfo[0];
+        const traderInfos = ordersAndTradersInfo[1];
+        const result = _.map(orderInfos, (orderInfo, index) => {
+            const traderInfo = traderInfos[index];
+            return {
+                orderInfo,
+                traderInfo,
+            };
+        });
+        return result;
+    }
+    /**
+     * Get an object conforming to TraderInfo containing on-chain balance and allowances for maker and taker of order
+     * @param   order           An object conforming to SignedOrder
+     * @param   takerAddress    An ethereum address
+     * @return  TraderInfo
+     */
+    public async getTraderInfoAsync(order: SignedOrder, takerAddress: string): Promise<TraderInfo> {
+        assert.doesConformToSchema('order', order, schemas.signedOrderSchema);
+        assert.isETHAddressHex('takerAddress', takerAddress);
+        const OrderValidatorContractInstance = await this._getOrderValidatorContractAsync();
+        const result = await OrderValidatorContractInstance.getTraderInfo.callAsync(order, takerAddress);
+        return result;
+    }
+    /**
+     * Get an array of objects conforming to TraderInfo containing on-chain balance and allowances for maker and taker of order
+     * @param   orders          An array of objects conforming to SignedOrder
+     * @param   takerAddresses  An array of ethereum addresses
+     * @return  array of TraderInfo
+     */
+    public async getTradersInfoAsync(orders: SignedOrder[], takerAddresses: string[]): Promise<TraderInfo[]> {
+        assert.doesConformToSchema('orders', orders, schemas.signedOrdersSchema);
+        _.forEach(takerAddresses, (takerAddress, index) =>
+            assert.isETHAddressHex(`takerAddresses[${index}]`, takerAddress),
+        );
+        assert.assert(orders.length === takerAddresses.length, 'Expected orders.length to equal takerAddresses.length');
+        const OrderValidatorContractInstance = await this._getOrderValidatorContractAsync();
+        const result = await OrderValidatorContractInstance.getTradersInfo.callAsync(orders, takerAddresses);
+        return result;
+    }
+    /**
+     * Get an object conforming to BalanceAndAllowance containing on-chain balance and allowance for some address and assetData
+     * @param   address     An ethereum address
+     * @param   assetData   An encoded string that can be decoded by a specified proxy contract
+     * @return  BalanceAndAllowance
+     */
+    public async getBalanceAndAllowanceAsync(address: string, assetData: string): Promise<BalanceAndAllowance> {
+        assert.isETHAddressHex('address', address);
+        assert.isHexString('assetData', assetData);
+        const OrderValidatorContractInstance = await this._getOrderValidatorContractAsync();
+        const balanceAndAllowance = await OrderValidatorContractInstance.getBalanceAndAllowance.callAsync(
+            address,
+            assetData,
+        );
+        const result = {
+            balance: balanceAndAllowance[0],
+            allowance: balanceAndAllowance[1],
+        };
+        return result;
+    }
+    /**
+     * Get an array of objects conforming to BalanceAndAllowance containing on-chain balance and allowance for some address and array of assetDatas
+     * @param   address     An ethereum address
+     * @param   assetDatas  An array of encoded strings that can be decoded by a specified proxy contract
+     * @return  BalanceAndAllowance
+     */
+    public async getBalancesAndAllowancesAsync(address: string, assetDatas: string[]): Promise<BalanceAndAllowance[]> {
+        assert.isETHAddressHex('address', address);
+        _.forEach(assetDatas, (assetData, index) => assert.isHexString(`assetDatas[${index}]`, assetData));
+        const OrderValidatorContractInstance = await this._getOrderValidatorContractAsync();
+        const balancesAndAllowances = await OrderValidatorContractInstance.getBalancesAndAllowances.callAsync(
+            address,
+            assetDatas,
+        );
+        const balances = balancesAndAllowances[0];
+        const allowances = balancesAndAllowances[1];
+        const result = _.map(balances, (balance, index) => {
+            const allowance = allowances[index];
+            return {
+                balance,
+                allowance,
+            };
+        });
+        return result;
+    }
+    /**
+     * Get owner address of tokenId by calling `token.ownerOf(tokenId)`, but returns a null owner instead of reverting on an unowned token.
+     * @param   tokenAddress    An ethereum address
+     * @param   tokenId         An ERC721 tokenId
+     * @return  Owner of tokenId or null address if unowned
+     */
+    public async getERC721TokenOwnerAsync(tokenAddress: string, tokenId: BigNumber): Promise<string | undefined> {
+        assert.isETHAddressHex('tokenAddress', tokenAddress);
+        assert.isBigNumber('tokenId', tokenId);
+        const OrderValidatorContractInstance = await this._getOrderValidatorContractAsync();
+        const result = await OrderValidatorContractInstance.getERC721TokenOwner.callAsync(tokenAddress, tokenId);
+        return result;
+    }
+    private async _getOrderValidatorContractAsync(): Promise<OrderValidatorContract> {
+        if (!_.isUndefined(this._orderValidatorContractIfExists)) {
+            return this._orderValidatorContractIfExists;
+        }
+        const contractInstance = new OrderValidatorContract(
+            this.abi,
+            this.address,
+            this._web3Wrapper.getProvider(),
+            this._web3Wrapper.getContractDefaults(),
+        );
+        this._orderValidatorContractIfExists = contractInstance;
+        return this._orderValidatorContractIfExists;
+    }
+}
diff --git a/packages/contract-wrappers/src/fetchers/asset_balance_and_proxy_allowance_fetcher.ts b/packages/contract-wrappers/src/fetchers/asset_balance_and_proxy_allowance_fetcher.ts
new file mode 100644
index 000000000..d10cffe57
--- /dev/null
+++ b/packages/contract-wrappers/src/fetchers/asset_balance_and_proxy_allowance_fetcher.ts
@@ -0,0 +1,77 @@
+// tslint:disable:no-unnecessary-type-assertion
+import { AbstractBalanceAndProxyAllowanceFetcher, assetDataUtils } from '@0x/order-utils';
+import { AssetProxyId, ERC20AssetData, ERC721AssetData } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import { BlockParamLiteral } from 'ethereum-types';
+
+import { ERC20TokenWrapper } from '../contract_wrappers/erc20_token_wrapper';
+import { ERC721TokenWrapper } from '../contract_wrappers/erc721_token_wrapper';
+
+export class AssetBalanceAndProxyAllowanceFetcher implements AbstractBalanceAndProxyAllowanceFetcher {
+    private readonly _erc20Token: ERC20TokenWrapper;
+    private readonly _erc721Token: ERC721TokenWrapper;
+    private readonly _stateLayer: BlockParamLiteral;
+    constructor(erc20Token: ERC20TokenWrapper, erc721Token: ERC721TokenWrapper, stateLayer: BlockParamLiteral) {
+        this._erc20Token = erc20Token;
+        this._erc721Token = erc721Token;
+        this._stateLayer = stateLayer;
+    }
+    public async getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
+        const decodedAssetData = assetDataUtils.decodeAssetDataOrThrow(assetData);
+        if (decodedAssetData.assetProxyId === AssetProxyId.ERC20) {
+            const decodedERC20AssetData = decodedAssetData as ERC20AssetData;
+            const balance = await this._erc20Token.getBalanceAsync(decodedERC20AssetData.tokenAddress, userAddress, {
+                defaultBlock: this._stateLayer,
+            });
+            return balance;
+        } else {
+            const decodedERC721AssetData = decodedAssetData as ERC721AssetData;
+            const tokenOwner = await this._erc721Token.getOwnerOfAsync(
+                decodedERC721AssetData.tokenAddress,
+                decodedERC721AssetData.tokenId,
+                {
+                    defaultBlock: this._stateLayer,
+                },
+            );
+            const balance = tokenOwner === userAddress ? new BigNumber(1) : new BigNumber(0);
+            return balance;
+        }
+    }
+    public async getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
+        const decodedAssetData = assetDataUtils.decodeAssetDataOrThrow(assetData);
+        if (decodedAssetData.assetProxyId === AssetProxyId.ERC20) {
+            const decodedERC20AssetData = decodedAssetData as ERC20AssetData;
+            const proxyAllowance = await this._erc20Token.getProxyAllowanceAsync(
+                decodedERC20AssetData.tokenAddress,
+                userAddress,
+                {
+                    defaultBlock: this._stateLayer,
+                },
+            );
+            return proxyAllowance;
+        } else {
+            const decodedERC721AssetData = decodedAssetData as ERC721AssetData;
+
+            const isApprovedForAll = await this._erc721Token.isProxyApprovedForAllAsync(
+                decodedERC721AssetData.tokenAddress,
+                userAddress,
+                {
+                    defaultBlock: this._stateLayer,
+                },
+            );
+            if (isApprovedForAll) {
+                return new BigNumber(this._erc20Token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS);
+            } else {
+                const isApproved = await this._erc721Token.isProxyApprovedAsync(
+                    decodedERC721AssetData.tokenAddress,
+                    decodedERC721AssetData.tokenId,
+                    {
+                        defaultBlock: this._stateLayer,
+                    },
+                );
+                const proxyAllowance = isApproved ? new BigNumber(1) : new BigNumber(0);
+                return proxyAllowance;
+            }
+        }
+    }
+}
diff --git a/packages/contract-wrappers/src/fetchers/order_filled_cancelled_fetcher.ts b/packages/contract-wrappers/src/fetchers/order_filled_cancelled_fetcher.ts
new file mode 100644
index 000000000..acf7038fa
--- /dev/null
+++ b/packages/contract-wrappers/src/fetchers/order_filled_cancelled_fetcher.ts
@@ -0,0 +1,29 @@
+// tslint:disable:no-unnecessary-type-assertion
+import { AbstractOrderFilledCancelledFetcher } from '@0x/order-utils';
+import { BigNumber } from '@0x/utils';
+import { BlockParamLiteral } from 'ethereum-types';
+
+import { ExchangeWrapper } from '../contract_wrappers/exchange_wrapper';
+
+export class OrderFilledCancelledFetcher implements AbstractOrderFilledCancelledFetcher {
+    private readonly _exchange: ExchangeWrapper;
+    private readonly _stateLayer: BlockParamLiteral;
+    constructor(exchange: ExchangeWrapper, stateLayer: BlockParamLiteral) {
+        this._exchange = exchange;
+        this._stateLayer = stateLayer;
+    }
+    public async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber> {
+        const filledTakerAmount = this._exchange.getFilledTakerAssetAmountAsync(orderHash, {
+            defaultBlock: this._stateLayer,
+        });
+        return filledTakerAmount;
+    }
+    public async isOrderCancelledAsync(orderHash: string): Promise<boolean> {
+        const isCancelled = await this._exchange.isCancelledAsync(orderHash);
+        return isCancelled;
+    }
+    public getZRXAssetData(): string {
+        const zrxAssetData = this._exchange.getZRXAssetData();
+        return zrxAssetData;
+    }
+}
diff --git a/packages/contract-wrappers/src/globals.d.ts b/packages/contract-wrappers/src/globals.d.ts
deleted file mode 100644
index 94e63a32d..000000000
--- a/packages/contract-wrappers/src/globals.d.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-declare module '*.json' {
-    const json: any;
-    /* tslint:disable */
-    export default json;
-    /* tslint:enable */
-}
diff --git a/packages/contract-wrappers/src/index.ts b/packages/contract-wrappers/src/index.ts
index 1986e0004..d66ff5c9c 100644
--- a/packages/contract-wrappers/src/index.ts
+++ b/packages/contract-wrappers/src/index.ts
@@ -1,3 +1,30 @@
+export { ContractAddresses } from '@0x/contract-addresses';
+
+export {
+    WETH9Events,
+    WETH9WithdrawalEventArgs,
+    WETH9ApprovalEventArgs,
+    WETH9EventArgs,
+    WETH9DepositEventArgs,
+    WETH9TransferEventArgs,
+    ERC20TokenTransferEventArgs,
+    ERC20TokenApprovalEventArgs,
+    ERC20TokenEvents,
+    ERC20TokenEventArgs,
+    ERC721TokenApprovalEventArgs,
+    ERC721TokenApprovalForAllEventArgs,
+    ERC721TokenTransferEventArgs,
+    ERC721TokenEvents,
+    ERC721TokenEventArgs,
+    ExchangeCancelUpToEventArgs,
+    ExchangeAssetProxyRegisteredEventArgs,
+    ExchangeSignatureValidatorApprovalEventArgs,
+    ExchangeFillEventArgs,
+    ExchangeCancelEventArgs,
+    ExchangeEventArgs,
+    ExchangeEvents,
+} from '@0x/abi-gen-wrappers';
+
 export { ContractWrappers } from './contract_wrappers';
 export { ERC20TokenWrapper } from './contract_wrappers/erc20_token_wrapper';
 export { ERC721TokenWrapper } from './contract_wrappers/erc721_token_wrapper';
@@ -6,77 +33,56 @@ export { ExchangeWrapper } from './contract_wrappers/exchange_wrapper';
 export { ERC20ProxyWrapper } from './contract_wrappers/erc20_proxy_wrapper';
 export { ERC721ProxyWrapper } from './contract_wrappers/erc721_proxy_wrapper';
 export { ForwarderWrapper } from './contract_wrappers/forwarder_wrapper';
+export { OrderValidatorWrapper } from './contract_wrappers/order_validator_wrapper';
+
+export { TransactionEncoder } from './utils/transaction_encoder';
 
 export {
     ContractWrappersError,
-    EventCallback,
-    ContractEvent,
-    Token,
+    ForwarderWrapperError,
     IndexedFilterValues,
     BlockRange,
-    OrderFillRequest,
-    ContractEventArgs,
     ContractWrappersConfig,
     MethodOpts,
     OrderTransactionOpts,
     TransactionOpts,
-    LogEvent,
-    DecodedLogEvent,
-    OnOrderStateChangeCallback,
     OrderStatus,
     OrderInfo,
+    EventCallback,
+    DecodedLogEvent,
+    BalanceAndAllowance,
+    OrderAndTraderInfo,
+    TraderInfo,
+    ValidateOrderFillableOpts,
 } from './types';
 
-export {
-    Order,
-    SignedOrder,
-    ECSignature,
-    OrderStateValid,
-    OrderStateInvalid,
-    OrderState,
-    AssetProxyId,
-} from '@0xproject/types';
+export { Order, SignedOrder, AssetProxyId } from '@0x/types';
 
 export {
     BlockParamLiteral,
-    FilterObject,
     BlockParam,
     ContractEventArg,
-    LogWithDecodedArgs,
     Provider,
-    TransactionReceipt,
-    TransactionReceiptWithDecodedLogs,
+    ContractAbi,
+    JSONRPCRequestPayload,
+    JSONRPCResponsePayload,
+    JSONRPCErrorCallback,
+    JSONRPCResponseError,
+    AbiDefinition,
+    LogWithDecodedArgs,
+    FunctionAbi,
+    EventAbi,
+    EventParameter,
+    DecodedLogArgs,
+    MethodAbi,
+    ConstructorAbi,
+    FallbackAbi,
+    DataItem,
+    ConstructorStateMutability,
+    StateMutability,
 } from 'ethereum-types';
 
-export {
-    WETH9Events,
-    WETH9WithdrawalEventArgs,
-    WETH9ApprovalEventArgs,
-    WETH9EventArgs,
-    WETH9DepositEventArgs,
-    WETH9TransferEventArgs,
-} from './contract_wrappers/generated/weth9';
-
-export {
-    ERC20TokenTransferEventArgs,
-    ERC20TokenApprovalEventArgs,
-    ERC20TokenEvents,
-    ERC20TokenEventArgs,
-} from './contract_wrappers/generated/erc20_token';
+export { AbstractBalanceAndProxyAllowanceFetcher, AbstractOrderFilledCancelledFetcher } from '@0x/order-utils';
 
-export {
-    ERC721TokenApprovalEventArgs,
-    ERC721TokenApprovalForAllEventArgs,
-    ERC721TokenTransferEventArgs,
-    ERC721TokenEvents,
-    ERC721TokenEventArgs,
-} from './contract_wrappers/generated/erc721_token';
-
-export {
-    ExchangeCancelUpToEventArgs,
-    ExchangeAssetProxyRegisteredEventArgs,
-    ExchangeFillEventArgs,
-    ExchangeCancelEventArgs,
-    ExchangeEventArgs,
-    ExchangeEvents,
-} from './contract_wrappers/generated/exchange';
+export { AssetBalanceAndProxyAllowanceFetcher } from './fetchers/asset_balance_and_proxy_allowance_fetcher';
+export { OrderFilledCancelledFetcher } from './fetchers/order_filled_cancelled_fetcher';
diff --git a/packages/contract-wrappers/src/monorepo_scripts/postpublish.ts b/packages/contract-wrappers/src/monorepo_scripts/postpublish.ts
deleted file mode 100644
index dcb99d0f7..000000000
--- a/packages/contract-wrappers/src/monorepo_scripts/postpublish.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-import { postpublishUtils } from '@0xproject/monorepo-scripts';
-
-import * as packageJSON from '../package.json';
-import * as tsConfigJSON from '../tsconfig.json';
-
-const cwd = `${__dirname}/..`;
-// tslint:disable-next-line:no-floating-promises
-postpublishUtils.runAsync(packageJSON, tsConfigJSON, cwd);
diff --git a/packages/contract-wrappers/src/schemas/contract_wrappers_config_schema.ts b/packages/contract-wrappers/src/schemas/contract_wrappers_config_schema.ts
index ac248b2d4..ae1ce668c 100644
--- a/packages/contract-wrappers/src/schemas/contract_wrappers_config_schema.ts
+++ b/packages/contract-wrappers/src/schemas/contract_wrappers_config_schema.ts
@@ -1,5 +1,25 @@
 export const ContractWrappersConfigSchema = {
     id: '/ContractWrappersConfig',
-    oneOf: [{ $ref: '/ZeroExContractPrivateNetworkConfig' }, { $ref: '/ZeroExContractPublicNetworkConfig' }],
+    properties: {
+        networkId: {
+            type: 'number',
+        },
+        gasPrice: { $ref: '/numberSchema' },
+        contractAddresses: {
+            type: 'object',
+            properties: {
+                erc20Proxy: { $ref: '/addressSchema' },
+                erc721Proxy: { $ref: '/addressSchema' },
+                zrxToken: { $ref: '/addressSchema' },
+                etherToken: { $ref: '/addressSchema' },
+                exchange: { $ref: '/addressSchema' },
+                assetProxyOwner: { $ref: '/addressSchema' },
+                forwarder: { $ref: '/addressSchema' },
+                orderValidator: { $ref: '/addressSchema' },
+            },
+        },
+        blockPollingIntervalMs: { type: 'number' },
+    },
     type: 'object',
+    required: ['networkId'],
 };
diff --git a/packages/contract-wrappers/src/schemas/contract_wrappers_private_network_config_schema.ts b/packages/contract-wrappers/src/schemas/contract_wrappers_private_network_config_schema.ts
deleted file mode 100644
index 904690ae7..000000000
--- a/packages/contract-wrappers/src/schemas/contract_wrappers_private_network_config_schema.ts
+++ /dev/null
@@ -1,36 +0,0 @@
-export const contractWrappersPrivateNetworkConfigSchema = {
-    id: '/ZeroExContractPrivateNetworkConfig',
-    properties: {
-        networkId: {
-            type: 'number',
-            minimum: 1,
-        },
-        gasPrice: { $ref: '/numberSchema' },
-        zrxContractAddress: { $ref: '/addressSchema' },
-        exchangeContractAddress: { $ref: '/addressSchema' },
-        erc20ProxyContractAddress: { $ref: '/addressSchema' },
-        erc721ProxyContractAddress: { $ref: '/addressSchema' },
-        blockPollingIntervalMs: { type: 'number' },
-        orderWatcherConfig: {
-            type: 'object',
-            properties: {
-                pollingIntervalMs: {
-                    type: 'number',
-                    minimum: 0,
-                },
-                numConfirmations: {
-                    type: 'number',
-                    minimum: 0,
-                },
-            },
-        },
-    },
-    type: 'object',
-    required: [
-        'networkId',
-        'zrxContractAddress',
-        'exchangeContractAddress',
-        'erc20ProxyContractAddress',
-        'erc721ProxyContractAddress',
-    ],
-};
diff --git a/packages/contract-wrappers/src/schemas/contract_wrappers_public_network_config_schema.ts b/packages/contract-wrappers/src/schemas/contract_wrappers_public_network_config_schema.ts
deleted file mode 100644
index 5cd008ae0..000000000
--- a/packages/contract-wrappers/src/schemas/contract_wrappers_public_network_config_schema.ts
+++ /dev/null
@@ -1,44 +0,0 @@
-const networkNameToId: { [networkName: string]: number } = {
-    mainnet: 1,
-    ropsten: 3,
-    rinkeby: 4,
-    kovan: 42,
-    ganache: 50,
-};
-
-export const contractWrappersPublicNetworkConfigSchema = {
-    id: '/ZeroExContractPublicNetworkConfig',
-    properties: {
-        networkId: {
-            type: 'number',
-            enum: [
-                networkNameToId.mainnet,
-                networkNameToId.kovan,
-                networkNameToId.ropsten,
-                networkNameToId.rinkeby,
-                networkNameToId.ganache,
-            ],
-        },
-        gasPrice: { $ref: '/numberSchema' },
-        zrxContractAddress: { $ref: '/addressSchema' },
-        exchangeContractAddress: { $ref: '/addressSchema' },
-        erc20ProxyContractAddress: { $ref: '/addressSchema' },
-        erc721ProxyContractAddress: { $ref: '/addressSchema' },
-        blockPollingIntervalMs: { type: 'number' },
-        orderWatcherConfig: {
-            type: 'object',
-            properties: {
-                pollingIntervalMs: {
-                    type: 'number',
-                    minimum: 0,
-                },
-                numConfirmations: {
-                    type: 'number',
-                    minimum: 0,
-                },
-            },
-        },
-    },
-    type: 'object',
-    required: ['networkId'],
-};
diff --git a/packages/contract-wrappers/src/types.ts b/packages/contract-wrappers/src/types.ts
index 2b3cdc591..5a5bdd530 100644
--- a/packages/contract-wrappers/src/types.ts
+++ b/packages/contract-wrappers/src/types.ts
@@ -1,25 +1,28 @@
-import { BigNumber } from '@0xproject/utils';
+import {
+    ERC20TokenEventArgs,
+    ERC20TokenEvents,
+    ERC721TokenEventArgs,
+    ERC721TokenEvents,
+    ExchangeEventArgs,
+    ExchangeEvents,
+    WETH9EventArgs,
+    WETH9Events,
+} from '@0x/abi-gen-wrappers';
+import { ContractAddresses } from '@0x/contract-addresses';
+import { OrderState, SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 
-import { OrderState, SignedOrder } from '@0xproject/types';
 import { BlockParam, ContractEventArg, DecodedLogArgs, LogEntryEvent, LogWithDecodedArgs } from 'ethereum-types';
 
-import { ERC20TokenEventArgs, ERC20TokenEvents } from './contract_wrappers/generated/erc20_token';
-import { ERC721TokenEventArgs, ERC721TokenEvents } from './contract_wrappers/generated/erc721_token';
-import { ExchangeEventArgs, ExchangeEvents } from './contract_wrappers/generated/exchange';
-import { WETH9EventArgs, WETH9Events } from './contract_wrappers/generated/weth9';
-
 export enum ExchangeWrapperError {
     AssetDataMismatch = 'ASSET_DATA_MISMATCH',
 }
 
+export enum ForwarderWrapperError {
+    CompleteFillFailed = 'COMPLETE_FILL_FAILED',
+}
+
 export enum ContractWrappersError {
-    ExchangeContractDoesNotExist = 'EXCHANGE_CONTRACT_DOES_NOT_EXIST',
-    ZRXContractDoesNotExist = 'ZRX_CONTRACT_DOES_NOT_EXIST',
-    EtherTokenContractDoesNotExist = 'ETHER_TOKEN_CONTRACT_DOES_NOT_EXIST',
-    ERC20ProxyContractDoesNotExist = 'ERC20_PROXY_CONTRACT_DOES_NOT_EXIST',
-    ERC721ProxyContractDoesNotExist = 'ERC721_PROXY_CONTRACT_DOES_NOT_EXIST',
-    ERC20TokenContractDoesNotExist = 'ERC20_TOKEN_CONTRACT_DOES_NOT_EXIST',
-    ERC721TokenContractDoesNotExist = 'ERC721_TOKEN_CONTRACT_DOES_NOT_EXIST',
     ContractNotDeployedOnNetwork = 'CONTRACT_NOT_DEPLOYED_ON_NETWORK',
     InsufficientAllowanceForTransfer = 'INSUFFICIENT_ALLOWANCE_FOR_TRANSFER',
     InsufficientBalanceForTransfer = 'INSUFFICIENT_BALANCE_FOR_TRANSFER',
@@ -31,6 +34,7 @@ export enum ContractWrappersError {
     SubscriptionAlreadyPresent = 'SUBSCRIPTION_ALREADY_PRESENT',
     ERC721OwnerNotFound = 'ERC_721_OWNER_NOT_FOUND',
     ERC721NoApproval = 'ERC_721_NO_APPROVAL',
+    SignatureRequestDenied = 'SIGNATURE_REQUEST_DENIED',
 }
 
 export enum InternalContractWrappersError {
@@ -105,22 +109,13 @@ export type SyncMethod = (...args: any[]) => any;
 /**
  * networkId: The id of the underlying ethereum network your provider is connected to. (1-mainnet, 3-ropsten, 4-rinkeby, 42-kovan, 50-testrpc)
  * gasPrice: Gas price to use with every transaction
- * exchangeContractAddress: The address of an exchange contract to use
- * zrxContractAddress: The address of the ZRX contract to use
- * erc20ProxyContractAddress: The address of the erc20 token transfer proxy contract to use
- * erc721ProxyContractAddress: The address of the erc721 token transfer proxy contract to use
- * forwarderContractAddress: The address of the forwarder contract to use
- * orderWatcherConfig: All the configs related to the orderWatcher
+ * contractAddresses: The address of all contracts to use. Defaults to the known addresses based on networkId.
  * blockPollingIntervalMs: The interval to use for block polling in event watching methods (defaults to 1000)
  */
 export interface ContractWrappersConfig {
     networkId: number;
     gasPrice?: BigNumber;
-    exchangeContractAddress?: string;
-    zrxContractAddress?: string;
-    erc20ProxyContractAddress?: string;
-    erc721ProxyContractAddress?: string;
-    forwarderContractAddress?: string;
+    contractAddresses?: ContractAddresses;
     blockPollingIntervalMs?: number;
 }
 
@@ -188,3 +183,24 @@ export enum OrderStatus {
     FULLY_FILLED,
     CANCELLED,
 }
+
+export interface TraderInfo {
+    makerBalance: BigNumber;
+    makerAllowance: BigNumber;
+    takerBalance: BigNumber;
+    takerAllowance: BigNumber;
+    makerZrxBalance: BigNumber;
+    makerZrxAllowance: BigNumber;
+    takerZrxBalance: BigNumber;
+    takerZrxAllowance: BigNumber;
+}
+
+export interface OrderAndTraderInfo {
+    orderInfo: OrderInfo;
+    traderInfo: TraderInfo;
+}
+
+export interface BalanceAndAllowance {
+    balance: BigNumber;
+    allowance: BigNumber;
+}
diff --git a/packages/contract-wrappers/src/utils/assert.ts b/packages/contract-wrappers/src/utils/assert.ts
index 183642170..3f02ed052 100644
--- a/packages/contract-wrappers/src/utils/assert.ts
+++ b/packages/contract-wrappers/src/utils/assert.ts
@@ -1,10 +1,10 @@
-import { assert as sharedAssert } from '@0xproject/assert';
+import { assert as sharedAssert } from '@0x/assert';
 // HACK: We need those two unused imports because they're actually used by sharedAssert which gets injected here
-import { Schema } from '@0xproject/json-schemas'; // tslint:disable-line:no-unused-variable
-import { assetDataUtils, isValidSignatureAsync } from '@0xproject/order-utils';
-import { ECSignature, Order } from '@0xproject/types'; // tslint:disable-line:no-unused-variable
-import { BigNumber } from '@0xproject/utils'; // tslint:disable-line:no-unused-variable
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { Schema } from '@0x/json-schemas'; // tslint:disable-line:no-unused-variable
+import { assetDataUtils, signatureUtils } from '@0x/order-utils';
+import { Order } from '@0x/types'; // tslint:disable-line:no-unused-variable
+import { BigNumber } from '@0x/utils'; // tslint:disable-line:no-unused-variable
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { Provider } from 'ethereum-types';
 import * as _ from 'lodash';
 
@@ -18,7 +18,7 @@ export const assert = {
         signature: string,
         signerAddress: string,
     ): Promise<void> {
-        const isValid = await isValidSignatureAsync(provider, orderHash, signature, signerAddress);
+        const isValid = await signatureUtils.isValidSignatureAsync(provider, orderHash, signature, signerAddress);
         sharedAssert.assert(isValid, `Expected order with hash '${orderHash}' to have a valid signature`);
     },
     isValidSubscriptionToken(variableName: string, subscriptionToken: string): void {
diff --git a/packages/contract-wrappers/src/utils/calldata_optimization_utils.ts b/packages/contract-wrappers/src/utils/calldata_optimization_utils.ts
index 3172cf531..bee7acaa7 100644
--- a/packages/contract-wrappers/src/utils/calldata_optimization_utils.ts
+++ b/packages/contract-wrappers/src/utils/calldata_optimization_utils.ts
@@ -1,4 +1,4 @@
-import { SignedOrder } from '@0xproject/types';
+import { SignedOrder } from '@0x/types';
 import * as _ from 'lodash';
 
 import { constants } from './constants';
diff --git a/packages/contract-wrappers/src/utils/constants.ts b/packages/contract-wrappers/src/utils/constants.ts
index 2df11538c..c587ba526 100644
--- a/packages/contract-wrappers/src/utils/constants.ts
+++ b/packages/contract-wrappers/src/utils/constants.ts
@@ -1,4 +1,4 @@
-import { BigNumber } from '@0xproject/utils';
+import { BigNumber } from '@0x/utils';
 
 export const constants = {
     NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
@@ -12,4 +12,7 @@ export const constants = {
     UNLIMITED_ALLOWANCE_IN_BASE_UNITS: new BigNumber(2).pow(256).minus(1),
     DEFAULT_BLOCK_POLLING_INTERVAL: 1000,
     ZERO_AMOUNT: new BigNumber(0),
+    ONE_AMOUNT: new BigNumber(1),
+    ETHER_TOKEN_DECIMALS: 18,
+    USER_DENIED_SIGNATURE_PATTERN: 'User denied transaction signature',
 };
diff --git a/packages/contract-wrappers/src/utils/contract_addresses.ts b/packages/contract-wrappers/src/utils/contract_addresses.ts
new file mode 100644
index 000000000..dc156e017
--- /dev/null
+++ b/packages/contract-wrappers/src/utils/contract_addresses.ts
@@ -0,0 +1,15 @@
+import { ContractAddresses, getContractAddressesForNetworkOrThrow, NetworkId } from '@0x/contract-addresses';
+import * as _ from 'lodash';
+
+/**
+ * Returns the default contract addresses for the given networkId or throws with
+ * a context-specific error message if the networkId is not recognized.
+ */
+export function _getDefaultContractAddresses(networkId: number): ContractAddresses {
+    if (!(networkId in NetworkId)) {
+        throw new Error(
+            `No default contract addresses found for the given network id (${networkId}). If you want to use ContractWrappers on this network, you must manually pass in the contract address(es) to the constructor.`,
+        );
+    }
+    return getContractAddressesForNetworkOrThrow(networkId);
+}
diff --git a/packages/contract-wrappers/src/utils/decorators.ts b/packages/contract-wrappers/src/utils/decorators.ts
index 6e77450e8..a4207ae4c 100644
--- a/packages/contract-wrappers/src/utils/decorators.ts
+++ b/packages/contract-wrappers/src/utils/decorators.ts
@@ -1,4 +1,3 @@
-import { RevertReason } from '@0xproject/types';
 import * as _ from 'lodash';
 
 import { AsyncMethod, ContractWrappersError, SyncMethod } from '../types';
@@ -24,7 +23,15 @@ const contractCallErrorTransformer = (error: Error) => {
 const schemaErrorTransformer = (error: Error) => {
     if (_.includes(error.message, constants.INVALID_TAKER_FORMAT)) {
         const errMsg =
-            'Order taker must be of type string. If you want anyone to be able to fill an order - pass ZeroEx.NULL_ADDRESS';
+            'Order taker must be of type string. If you want anyone to be able to fill an order - pass NULL_ADDRESS';
+        return new Error(errMsg);
+    }
+    return error;
+};
+
+const signatureRequestErrorTransformer = (error: Error) => {
+    if (_.includes(error.message, constants.USER_DENIED_SIGNATURE_PATTERN)) {
+        const errMsg = ContractWrappersError.SignatureRequestDenied;
         return new Error(errMsg);
     }
     return error;
@@ -46,7 +53,7 @@ const asyncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
         // tslint:disable-next-line:only-arrow-functions
         descriptor.value = async function(...args: any[]): Promise<any> {
             try {
-                const result = await originalMethod.apply(this, args);
+                const result = await originalMethod.apply(this, args); // tslint:disable-line:no-invalid-this
                 return result;
             } catch (error) {
                 const transformedError = errorTransformer(error);
@@ -73,7 +80,7 @@ const syncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
         // tslint:disable-next-line:only-arrow-functions
         descriptor.value = function(...args: any[]): any {
             try {
-                const result = originalMethod.apply(this, args);
+                const result = originalMethod.apply(this, args); // tslint:disable-line:no-invalid-this
                 return result;
             } catch (error) {
                 const transformedError = errorTransformer(error);
@@ -88,7 +95,11 @@ const syncErrorHandlerFactory = (errorTransformer: ErrorTransformer) => {
 };
 
 // _.flow(f, g) = f ∘ g
-const zeroExErrorTransformer = _.flow(schemaErrorTransformer, contractCallErrorTransformer);
+const zeroExErrorTransformer = _.flow(
+    schemaErrorTransformer,
+    contractCallErrorTransformer,
+    signatureRequestErrorTransformer,
+);
 
 export const decorators = {
     asyncZeroExErrorHandler: asyncErrorHandlerFactory(zeroExErrorTransformer),
diff --git a/packages/contract-wrappers/src/utils/exchange_transfer_simulator.ts b/packages/contract-wrappers/src/utils/exchange_transfer_simulator.ts
index 279f2a796..f374d509b 100644
--- a/packages/contract-wrappers/src/utils/exchange_transfer_simulator.ts
+++ b/packages/contract-wrappers/src/utils/exchange_transfer_simulator.ts
@@ -1,5 +1,5 @@
-import { ExchangeContractErrs } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { ExchangeContractErrs } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 
 import { AbstractBalanceAndProxyAllowanceLazyStore } from '../abstract/abstract_balance_and_proxy_allowance_lazy_store';
 import { TradeSide, TransferType } from '../types';
@@ -34,7 +34,7 @@ const ERR_MSG_MAPPING = {
 };
 
 export class ExchangeTransferSimulator {
-    private _store: AbstractBalanceAndProxyAllowanceLazyStore;
+    private readonly _store: AbstractBalanceAndProxyAllowanceLazyStore;
     private static _throwValidationError(
         failureReason: FailureReason,
         tradeSide: TradeSide,
diff --git a/packages/contract-wrappers/src/utils/filter_utils.ts b/packages/contract-wrappers/src/utils/filter_utils.ts
index 0e73987f7..c05be062c 100644
--- a/packages/contract-wrappers/src/utils/filter_utils.ts
+++ b/packages/contract-wrappers/src/utils/filter_utils.ts
@@ -1,4 +1,4 @@
-import { ConstructorAbi, ContractAbi, EventAbi, FallbackAbi, FilterObject, LogEntry, MethodAbi } from 'ethereum-types';
+import { ContractAbi, EventAbi, FilterObject, LogEntry } from 'ethereum-types';
 import * as ethUtil from 'ethereumjs-util';
 import * as jsSHA3 from 'js-sha3';
 import * as _ from 'lodash';
diff --git a/packages/contract-wrappers/src/utils/transaction_encoder.ts b/packages/contract-wrappers/src/utils/transaction_encoder.ts
index 5c2a94b74..0cf08a8fe 100644
--- a/packages/contract-wrappers/src/utils/transaction_encoder.ts
+++ b/packages/contract-wrappers/src/utils/transaction_encoder.ts
@@ -1,29 +1,20 @@
-import { schemas } from '@0xproject/json-schemas';
-import { EIP712Schema, EIP712Types, EIP712Utils } from '@0xproject/order-utils';
-import { Order, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import _ = require('lodash');
+import { ExchangeContract } from '@0x/abi-gen-wrappers';
 
-import { ExchangeContract } from '../contract_wrappers/generated/exchange';
+import { schemas } from '@0x/json-schemas';
+import { eip712Utils } from '@0x/order-utils';
+import { Order, SignedOrder } from '@0x/types';
+import { BigNumber, signTypedDataUtils } from '@0x/utils';
+import _ = require('lodash');
 
 import { assert } from './assert';
 
-const EIP712_ZEROEX_TRANSACTION_SCHEMA: EIP712Schema = {
-    name: 'ZeroExTransaction',
-    parameters: [
-        { name: 'salt', type: EIP712Types.Uint256 },
-        { name: 'signerAddress', type: EIP712Types.Address },
-        { name: 'data', type: EIP712Types.Bytes },
-    ],
-};
-
 /**
  * Transaction Encoder. Transaction messages exist for the purpose of calling methods on the Exchange contract
  * in the context of another address. For example, UserA can encode and sign a fillOrder transaction and UserB
  * can submit this to the blockchain. The Exchange context executes as if UserA had directly submitted this transaction.
  */
 export class TransactionEncoder {
-    private _exchangeInstance: ExchangeContract;
+    private readonly _exchangeInstance: ExchangeContract;
     constructor(exchangeInstance: ExchangeContract) {
         this._exchangeInstance = exchangeInstance;
     }
@@ -41,12 +32,9 @@ export class TransactionEncoder {
             signerAddress,
             data,
         };
-        const executeTransactionHashBuff = EIP712Utils.structHash(
-            EIP712_ZEROEX_TRANSACTION_SCHEMA,
-            executeTransactionData,
-        );
-        const eip721MessageBuffer = EIP712Utils.createEIP712Message(executeTransactionHashBuff, exchangeAddress);
-        const messageHex = `0x${eip721MessageBuffer.toString('hex')}`;
+        const typedData = eip712Utils.createZeroExTransactionTypedData(executeTransactionData, exchangeAddress);
+        const eip712MessageBuffer = signTypedDataUtils.generateTypedDataHash(typedData);
+        const messageHex = `0x${eip712MessageBuffer.toString('hex')}`;
         return messageHex;
     }
     /**
diff --git a/packages/contract-wrappers/src/utils/utils.ts b/packages/contract-wrappers/src/utils/utils.ts
index 689a7ee0a..0b3270e78 100644
--- a/packages/contract-wrappers/src/utils/utils.ts
+++ b/packages/contract-wrappers/src/utils/utils.ts
@@ -1,4 +1,8 @@
-import { BigNumber } from '@0xproject/utils';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import * as _ from 'lodash';
+
+import { constants } from './constants';
 
 export const utils = {
     getCurrentUnixTimestampSec(): BigNumber {
@@ -8,4 +12,10 @@ export const utils = {
     getCurrentUnixTimestampMs(): BigNumber {
         return new BigNumber(Date.now());
     },
+    numberPercentageToEtherTokenAmountPercentage(percentage: number): BigNumber {
+        return Web3Wrapper.toBaseUnitAmount(constants.ONE_AMOUNT, constants.ETHER_TOKEN_DECIMALS).mul(percentage);
+    },
+    removeUndefinedProperties<T extends object>(obj: T): Partial<T> {
+        return _.pickBy(obj);
+    },
 };
diff --git a/packages/contract-wrappers/test/artifacts_test.ts b/packages/contract-wrappers/test/artifacts_test.ts
deleted file mode 100644
index c05d513b3..000000000
--- a/packages/contract-wrappers/test/artifacts_test.ts
+++ /dev/null
@@ -1,43 +0,0 @@
-import { web3Factory } from '@0xproject/dev-utils';
-
-import { ContractWrappers } from '../src';
-
-import { chaiSetup } from './utils/chai_setup';
-import { constants } from './utils/constants';
-
-chaiSetup.configure();
-
-// Those tests are slower cause they're talking to a remote node
-const TIMEOUT = 10000;
-
-// TODO: Re-enable those tests after final kovan and ropsten deployments are done.
-describe.skip('Artifacts', () => {
-    describe('contracts are deployed on kovan', () => {
-        const kovanRpcUrl = constants.KOVAN_RPC_URL;
-        const provider = web3Factory.getRpcProvider({ rpcUrl: kovanRpcUrl });
-        const config = {
-            networkId: constants.KOVAN_NETWORK_ID,
-        };
-        const contractWrappers = new ContractWrappers(provider, config);
-        it('erc20 proxy contract is deployed', async () => {
-            await (contractWrappers.erc20Proxy as any)._getTokenTransferProxyContractAsync();
-        }).timeout(TIMEOUT);
-        it('erc721 proxy contract is deployed', async () => {
-            await (contractWrappers.erc721Proxy as any)._getTokenTransferProxyContractAsync();
-        }).timeout(TIMEOUT);
-    });
-    describe('contracts are deployed on ropsten', () => {
-        const ropstenRpcUrl = constants.ROPSTEN_RPC_URL;
-        const provider = web3Factory.getRpcProvider({ rpcUrl: ropstenRpcUrl });
-        const config = {
-            networkId: constants.ROPSTEN_NETWORK_ID,
-        };
-        const contractWrappers = new ContractWrappers(provider, config);
-        it('erc20 proxy contract is deployed', async () => {
-            await (contractWrappers.erc20Proxy as any)._getTokenTransferProxyContractAsync();
-        }).timeout(TIMEOUT);
-        it('erc721 proxy contract is deployed', async () => {
-            await (contractWrappers.erc721Proxy as any)._getTokenTransferProxyContractAsync();
-        }).timeout(TIMEOUT);
-    });
-});
diff --git a/packages/contract-wrappers/test/calldata_optimization_utils_test.ts b/packages/contract-wrappers/test/calldata_optimization_utils_test.ts
index a4cea772f..6cb8a669e 100644
--- a/packages/contract-wrappers/test/calldata_optimization_utils_test.ts
+++ b/packages/contract-wrappers/test/calldata_optimization_utils_test.ts
@@ -1,9 +1,8 @@
-import { orderFactory } from '@0xproject/order-utils';
+import { orderFactory } from '@0x/order-utils/lib/src/order_factory';
 import * as chai from 'chai';
 import * as _ from 'lodash';
 import 'mocha';
 
-import { assert } from '../src/utils/assert';
 import { calldataOptimizationUtils } from '../src/utils/calldata_optimization_utils';
 import { constants } from '../src/utils/constants';
 
diff --git a/packages/contract-wrappers/test/erc20_proxy_wrapper_test.ts b/packages/contract-wrappers/test/erc20_proxy_wrapper_test.ts
index 6bf9f1e25..d8dfa4204 100644
--- a/packages/contract-wrappers/test/erc20_proxy_wrapper_test.ts
+++ b/packages/contract-wrappers/test/erc20_proxy_wrapper_test.ts
@@ -4,6 +4,7 @@ import { ContractWrappers } from '../src';
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { provider } from './utils/web3_wrapper';
 
 chaiSetup.configure();
@@ -11,10 +12,13 @@ const expect = chai.expect;
 
 describe('ERC20ProxyWrapper', () => {
     let contractWrappers: ContractWrappers;
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-    };
     before(async () => {
+        const contractAddresses = await migrateOnceAsync();
+        const config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
         contractWrappers = new ContractWrappers(provider, config);
     });
     describe('#isAuthorizedAsync', () => {
diff --git a/packages/contract-wrappers/test/erc20_wrapper_test.ts b/packages/contract-wrappers/test/erc20_wrapper_test.ts
index cf7ac527e..15d3a9ead 100644
--- a/packages/contract-wrappers/test/erc20_wrapper_test.ts
+++ b/packages/contract-wrappers/test/erc20_wrapper_test.ts
@@ -1,7 +1,8 @@
-import { BlockchainLifecycle, callbackErrorReporter } from '@0xproject/dev-utils';
-import { EmptyWalletSubprovider, Web3ProviderEngine } from '@0xproject/subproviders';
-import { DoneCallback } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { ContractAddresses } from '@0x/contract-addresses';
+import { BlockchainLifecycle, callbackErrorReporter } from '@0x/dev-utils';
+import { EmptyWalletSubprovider, Web3ProviderEngine } from '@0x/subproviders';
+import { DoneCallback } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 import * as chai from 'chai';
 import { Provider } from 'ethereum-types';
 import 'mocha';
@@ -10,6 +11,7 @@ import {
     BlockParamLiteral,
     BlockRange,
     ContractWrappers,
+    ContractWrappersConfig,
     ContractWrappersError,
     DecodedLogEvent,
     ERC20TokenApprovalEventArgs,
@@ -19,6 +21,7 @@ import {
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { tokenUtils } from './utils/token_utils';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
@@ -28,14 +31,20 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 
 describe('ERC20Wrapper', () => {
     let contractWrappers: ContractWrappers;
+    let contractAddresses: ContractAddresses;
     let userAddresses: string[];
     let tokens: string[];
     let coinbase: string;
     let addressWithoutFunds: string;
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-    };
+    let config: ContractWrappersConfig;
+
     before(async () => {
+        contractAddresses = await migrateOnceAsync();
+        config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
         contractWrappers = new ContractWrappers(provider, config);
         userAddresses = await web3Wrapper.getAvailableAddressesAsync();
         tokens = tokenUtils.getDummyERC20TokenAddresses();
@@ -71,19 +80,6 @@ describe('ERC20Wrapper', () => {
                 contractWrappers.erc20Token.transferAsync(tokenAddress, fromAddress, toAddress, transferAmount),
             ).to.be.rejectedWith(ContractWrappersError.InsufficientBalanceForTransfer);
         });
-        it('should throw a CONTRACT_DOES_NOT_EXIST error for a non-existent token contract', async () => {
-            const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
-            const fromAddress = coinbase;
-            const toAddress = coinbase;
-            return expect(
-                contractWrappers.erc20Token.transferAsync(
-                    nonExistentTokenAddress,
-                    fromAddress,
-                    toAddress,
-                    transferAmount,
-                ),
-            ).to.be.rejectedWith(ContractWrappersError.ERC20TokenContractDoesNotExist);
-        });
     });
     describe('#transferFromAsync', () => {
         let tokenAddress: string;
@@ -188,19 +184,6 @@ describe('ERC20Wrapper', () => {
             const postBalance = await contractWrappers.erc20Token.getBalanceAsync(tokenAddress, toAddress);
             return expect(postBalance).to.be.bignumber.equal(transferAmount);
         });
-        it('should throw a CONTRACT_DOES_NOT_EXIST error for a non-existent token contract', async () => {
-            const fromAddress = coinbase;
-            const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
-            return expect(
-                contractWrappers.erc20Token.transferFromAsync(
-                    nonExistentTokenAddress,
-                    fromAddress,
-                    toAddress,
-                    senderAddress,
-                    new BigNumber(42),
-                ),
-            ).to.be.rejectedWith(ContractWrappersError.ERC20TokenContractDoesNotExist);
-        });
     });
     describe('#getBalanceAsync', () => {
         describe('With provider with accounts', () => {
@@ -211,13 +194,6 @@ describe('ERC20Wrapper', () => {
                 const expectedBalance = new BigNumber('1000000000000000000000000000');
                 return expect(balance).to.be.bignumber.equal(expectedBalance);
             });
-            it('should throw a CONTRACT_DOES_NOT_EXIST error for a non-existent token contract', async () => {
-                const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
-                const ownerAddress = coinbase;
-                return expect(
-                    contractWrappers.erc20Token.getBalanceAsync(nonExistentTokenAddress, ownerAddress),
-                ).to.be.rejectedWith(ContractWrappersError.ERC20TokenContractDoesNotExist);
-            });
             it('should return a balance of 0 for a non-existent owner address', async () => {
                 const tokenAddress = tokens[0];
                 const nonExistentOwner = '0x198c6ad858f213fb31b6fe809e25040e6b964593';
@@ -293,7 +269,7 @@ describe('ERC20Wrapper', () => {
         });
         it('should reduce the gas cost for transfers including tokens with unlimited allowance support', async () => {
             const transferAmount = new BigNumber(5);
-            const zrxAddress = tokenUtils.getProtocolTokenAddress();
+            const zrxAddress = contractAddresses.zrxToken;
             const [, userWithNormalAllowance, userWithUnlimitedAllowance] = userAddresses;
             await contractWrappers.erc20Token.setAllowanceAsync(
                 zrxAddress,
@@ -524,7 +500,7 @@ describe('ERC20Wrapper', () => {
                 );
             })().catch(done);
         });
-        it('Outstanding subscriptions are cancelled when contractWrappers.setProvider called', (done: DoneCallback) => {
+        it('Outstanding subscriptions are cancelled when contractWrappers.unsubscribeAll called', (done: DoneCallback) => {
             (async () => {
                 const callbackNeverToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)(
                     (_logEvent: DecodedLogEvent<ERC20TokenApprovalEventArgs>) => {
@@ -538,7 +514,7 @@ describe('ERC20Wrapper', () => {
                     callbackNeverToBeCalled,
                 );
                 const callbackToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)();
-                contractWrappers.setProvider(provider, constants.TESTRPC_NETWORK_ID);
+                contractWrappers.unsubscribeAll();
                 contractWrappers.erc20Token.subscribe(
                     tokenAddress,
                     ERC20TokenEvents.Transfer,
@@ -587,7 +563,7 @@ describe('ERC20Wrapper', () => {
         let txHash: string;
         before(() => {
             tokenAddress = tokens[0];
-            tokenTransferProxyAddress = contractWrappers.erc20Proxy.getContractAddress();
+            tokenTransferProxyAddress = contractWrappers.erc20Proxy.address;
         });
         it('should get logs with decoded args emitted by Approval', async () => {
             txHash = await contractWrappers.erc20Token.setUnlimitedProxyAllowanceAsync(tokenAddress, coinbase);
diff --git a/packages/contract-wrappers/test/erc721_proxy_wrapper_test.ts b/packages/contract-wrappers/test/erc721_proxy_wrapper_test.ts
index 9473d930b..9b0fe8817 100644
--- a/packages/contract-wrappers/test/erc721_proxy_wrapper_test.ts
+++ b/packages/contract-wrappers/test/erc721_proxy_wrapper_test.ts
@@ -4,6 +4,7 @@ import { ContractWrappers } from '../src';
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { provider } from './utils/web3_wrapper';
 
 chaiSetup.configure();
@@ -11,10 +12,13 @@ const expect = chai.expect;
 
 describe('ERC721ProxyWrapper', () => {
     let contractWrappers: ContractWrappers;
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-    };
     before(async () => {
+        const contractAddresses = await migrateOnceAsync();
+        const config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
         contractWrappers = new ContractWrappers(provider, config);
     });
     describe('#isAuthorizedAsync', () => {
diff --git a/packages/contract-wrappers/test/erc721_wrapper_test.ts b/packages/contract-wrappers/test/erc721_wrapper_test.ts
index f005ac2e0..a7f1e4c41 100644
--- a/packages/contract-wrappers/test/erc721_wrapper_test.ts
+++ b/packages/contract-wrappers/test/erc721_wrapper_test.ts
@@ -1,7 +1,7 @@
-import { BlockchainLifecycle, callbackErrorReporter } from '@0xproject/dev-utils';
-import { EmptyWalletSubprovider, Web3ProviderEngine } from '@0xproject/subproviders';
-import { DoneCallback } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { BlockchainLifecycle, callbackErrorReporter } from '@0x/dev-utils';
+import { EmptyWalletSubprovider, Web3ProviderEngine } from '@0x/subproviders';
+import { DoneCallback } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 import * as chai from 'chai';
 import { Provider } from 'ethereum-types';
 import 'mocha';
@@ -10,6 +10,7 @@ import {
     BlockParamLiteral,
     BlockRange,
     ContractWrappers,
+    ContractWrappersConfig,
     ContractWrappersError,
     DecodedLogEvent,
     ERC721TokenApprovalEventArgs,
@@ -20,6 +21,7 @@ import {
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { tokenUtils } from './utils/token_utils';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
@@ -37,10 +39,15 @@ describe('ERC721Wrapper', () => {
     let operatorAddress: string;
     let approvedAddress: string;
     let receiverAddress: string;
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-    };
+    let config: ContractWrappersConfig;
+
     before(async () => {
+        const contractAddresses = await migrateOnceAsync();
+        config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
         contractWrappers = new ContractWrappers(provider, config);
         userAddresses = await web3Wrapper.getAvailableAddressesAsync();
         tokens = tokenUtils.getDummyERC721TokenAddresses();
@@ -108,12 +115,6 @@ describe('ERC721Wrapper', () => {
                 tokenCount = await contractWrappers.erc721Token.getTokenCountAsync(tokenAddress, ownerAddress);
                 expect(tokenCount).to.be.bignumber.equal(1);
             });
-            it('should throw a CONTRACT_DOES_NOT_EXIST error for a non-existent token contract', async () => {
-                const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
-                return expect(
-                    contractWrappers.erc721Token.getTokenCountAsync(nonExistentTokenAddress, ownerAddress),
-                ).to.be.rejectedWith(ContractWrappersError.ERC721TokenContractDoesNotExist);
-            });
             it('should return a balance of 0 for a non-existent owner address', async () => {
                 const nonExistentOwner = '0x198c6ad858f213fb31b6fe809e25040e6b964593';
                 const balance = await contractWrappers.erc721Token.getTokenCountAsync(tokenAddress, nonExistentOwner);
@@ -142,13 +143,6 @@ describe('ERC721Wrapper', () => {
             const tokenOwner = await contractWrappers.erc721Token.getOwnerOfAsync(tokenAddress, tokenId);
             expect(tokenOwner).to.be.bignumber.equal(ownerAddress);
         });
-        it('should throw a CONTRACT_DOES_NOT_EXIST error for a non-existent token contract', async () => {
-            const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
-            const fakeTokenId = new BigNumber(42);
-            return expect(
-                contractWrappers.erc721Token.getOwnerOfAsync(nonExistentTokenAddress, fakeTokenId),
-            ).to.be.rejectedWith(ContractWrappersError.ERC721TokenContractDoesNotExist);
-        });
         it('should return undefined not 0 for a non-existent ERC721', async () => {
             const fakeTokenId = new BigNumber(42);
             return expect(contractWrappers.erc721Token.getOwnerOfAsync(tokenAddress, fakeTokenId)).to.be.rejectedWith(
@@ -229,11 +223,17 @@ describe('ERC721Wrapper', () => {
         it('should set the proxy approval', async () => {
             const tokenId = await tokenUtils.mintDummyERC721Async(tokenAddress, ownerAddress);
 
-            const approvalBeforeSet = await contractWrappers.erc721Token.isProxyApprovedAsync(tokenAddress, tokenId);
-            expect(approvalBeforeSet).to.be.false();
+            const isProxyApprovedBeforeSet = await contractWrappers.erc721Token.isProxyApprovedAsync(
+                tokenAddress,
+                tokenId,
+            );
+            expect(isProxyApprovedBeforeSet).to.be.false();
             await contractWrappers.erc721Token.setProxyApprovalAsync(tokenAddress, tokenId);
-            const approvalAfterSet = await contractWrappers.erc721Token.isProxyApprovedAsync(tokenAddress, tokenId);
-            expect(approvalAfterSet).to.be.true();
+            const isProxyApprovedAfterSet = await contractWrappers.erc721Token.isProxyApprovedAsync(
+                tokenAddress,
+                tokenId,
+            );
+            expect(isProxyApprovedAfterSet).to.be.true();
         });
     });
     describe('#subscribe', () => {
@@ -313,7 +313,7 @@ describe('ERC721Wrapper', () => {
                 );
             })().catch(done);
         });
-        it('Outstanding subscriptions are cancelled when contractWrappers.setProvider called', (done: DoneCallback) => {
+        it('Outstanding subscriptions are cancelled when contractWrappers.unsubscribeAll called', (done: DoneCallback) => {
             (async () => {
                 const callbackNeverToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)(
                     (logEvent: DecodedLogEvent<ERC721TokenApprovalEventArgs>) => {
@@ -327,7 +327,7 @@ describe('ERC721Wrapper', () => {
                     callbackNeverToBeCalled,
                 );
                 const callbackToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)();
-                contractWrappers.setProvider(provider, constants.TESTRPC_NETWORK_ID);
+                contractWrappers.unsubscribeAll();
                 contractWrappers.erc721Token.subscribe(
                     tokenAddress,
                     ERC721TokenEvents.Approval,
@@ -357,7 +357,6 @@ describe('ERC721Wrapper', () => {
                 );
                 contractWrappers.erc721Token.unsubscribe(subscriptionToken);
 
-                const tokenId = await tokenUtils.mintDummyERC721Async(tokenAddress, ownerAddress);
                 const isApproved = true;
                 await web3Wrapper.awaitTransactionSuccessAsync(
                     await contractWrappers.erc721Token.setApprovalForAllAsync(
@@ -373,15 +372,11 @@ describe('ERC721Wrapper', () => {
         });
     });
     describe('#getLogsAsync', () => {
-        let tokenTransferProxyAddress: string;
         const blockRange: BlockRange = {
             fromBlock: 0,
             toBlock: BlockParamLiteral.Latest,
         };
         let txHash: string;
-        before(() => {
-            tokenTransferProxyAddress = contractWrappers.erc721Proxy.getContractAddress();
-        });
         it('should get logs with decoded args emitted by ApprovalForAll', async () => {
             const isApprovedForAll = true;
             txHash = await contractWrappers.erc721Token.setApprovalForAllAsync(
diff --git a/packages/contract-wrappers/test/ether_token_wrapper_test.ts b/packages/contract-wrappers/test/ether_token_wrapper_test.ts
index 48bd6d3f6..e3efef19d 100644
--- a/packages/contract-wrappers/test/ether_token_wrapper_test.ts
+++ b/packages/contract-wrappers/test/ether_token_wrapper_test.ts
@@ -1,7 +1,8 @@
-import { BlockchainLifecycle, callbackErrorReporter } from '@0xproject/dev-utils';
-import { DoneCallback } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { ContractAddresses } from '@0x/contract-addresses';
+import { BlockchainLifecycle, callbackErrorReporter } from '@0x/dev-utils';
+import { DoneCallback } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import * as chai from 'chai';
 import 'mocha';
 
@@ -10,17 +11,17 @@ import {
     BlockRange,
     ContractWrappers,
     ContractWrappersError,
-    DecodedLogEvent,
     WETH9ApprovalEventArgs,
     WETH9DepositEventArgs,
     WETH9Events,
     WETH9TransferEventArgs,
     WETH9WithdrawalEventArgs,
 } from '../src';
+import { DecodedLogEvent } from '../src/types';
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
-import { tokenUtils } from './utils/token_utils';
+import { migrateOnceAsync } from './utils/migrate';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
 chaiSetup.configure();
@@ -35,6 +36,7 @@ const MAX_REASONABLE_GAS_COST_IN_WEI = 62517;
 
 describe('EtherTokenWrapper', () => {
     let contractWrappers: ContractWrappers;
+    let contractAddresses: ContractAddresses;
     let userAddresses: string[];
     let addressWithETH: string;
     let wethContractAddress: string;
@@ -42,19 +44,22 @@ describe('EtherTokenWrapper', () => {
     const decimalPlaces = 7;
     let addressWithoutFunds: string;
     const gasPrice = new BigNumber(1);
-    const zeroExConfig = {
-        gasPrice,
-        networkId: constants.TESTRPC_NETWORK_ID,
-    };
     const transferAmount = new BigNumber(42);
     const allowanceAmount = new BigNumber(42);
     const depositAmount = new BigNumber(42);
     const withdrawalAmount = new BigNumber(42);
     before(async () => {
-        contractWrappers = new ContractWrappers(provider, zeroExConfig);
+        contractAddresses = await migrateOnceAsync();
+        const config = {
+            gasPrice,
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
+        contractWrappers = new ContractWrappers(provider, config);
         userAddresses = await web3Wrapper.getAvailableAddressesAsync();
         addressWithETH = userAddresses[0];
-        wethContractAddress = contractWrappers.etherToken.getContractAddressIfExists() as string;
+        wethContractAddress = contractAddresses.etherToken;
         depositWeiAmount = Web3Wrapper.toWei(new BigNumber(5));
         addressWithoutFunds = userAddresses[1];
     });
@@ -66,7 +71,7 @@ describe('EtherTokenWrapper', () => {
     });
     describe('#getContractAddressIfExists', async () => {
         it('should return contract address if connected to a known network', () => {
-            const contractAddressIfExists = contractWrappers.etherToken.getContractAddressIfExists();
+            const contractAddressIfExists = contractAddresses.etherToken;
             expect(contractAddressIfExists).to.not.be.undefined();
         });
         it('should throw if connected to a private network and contract addresses are not specified', () => {
@@ -171,7 +176,7 @@ describe('EtherTokenWrapper', () => {
         const indexFilterValues = {};
         let etherTokenAddress: string;
         before(async () => {
-            etherTokenAddress = tokenUtils.getWethTokenAddress();
+            etherTokenAddress = contractAddresses.etherToken;
         });
         afterEach(() => {
             contractWrappers.etherToken.unsubscribeAll();
@@ -278,7 +283,7 @@ describe('EtherTokenWrapper', () => {
                 await contractWrappers.etherToken.withdrawAsync(etherTokenAddress, withdrawalAmount, addressWithETH);
             })().catch(done);
         });
-        it('should cancel outstanding subscriptions when ZeroEx.setProvider is called', (done: DoneCallback) => {
+        it('should cancel outstanding subscriptions when contractWrappers.unsubscribeAll is called', (done: DoneCallback) => {
             (async () => {
                 const callbackNeverToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)(
                     (_logEvent: DecodedLogEvent<WETH9ApprovalEventArgs>) => {
@@ -292,7 +297,7 @@ describe('EtherTokenWrapper', () => {
                     callbackNeverToBeCalled,
                 );
                 const callbackToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)();
-                contractWrappers.setProvider(provider, constants.TESTRPC_NETWORK_ID);
+                contractWrappers.unsubscribeAll();
                 await contractWrappers.etherToken.depositAsync(etherTokenAddress, transferAmount, addressWithETH);
                 contractWrappers.etherToken.subscribe(
                     etherTokenAddress,
@@ -340,10 +345,10 @@ describe('EtherTokenWrapper', () => {
         let txHash: string;
         before(async () => {
             addressWithETH = userAddresses[0];
-            etherTokenAddress = tokenUtils.getWethTokenAddress();
-            erc20ProxyAddress = contractWrappers.erc20Proxy.getContractAddress();
+            etherTokenAddress = contractAddresses.etherToken;
+            erc20ProxyAddress = contractWrappers.erc20Proxy.address;
             // Start the block range after all migrations to avoid unexpected logs
-            const currentBlock = await web3Wrapper.getBlockNumberAsync();
+            const currentBlock: number = await web3Wrapper.getBlockNumberAsync();
             const fromBlock = currentBlock + 1;
             blockRange = {
                 fromBlock,
diff --git a/packages/contract-wrappers/test/exchange_wrapper_test.ts b/packages/contract-wrappers/test/exchange_wrapper_test.ts
index fa3b49eb9..0e537bd83 100644
--- a/packages/contract-wrappers/test/exchange_wrapper_test.ts
+++ b/packages/contract-wrappers/test/exchange_wrapper_test.ts
@@ -1,23 +1,18 @@
-import { BlockchainLifecycle, callbackErrorReporter } from '@0xproject/dev-utils';
-import { FillScenarios } from '@0xproject/fill-scenarios';
-import { assetDataUtils, orderHashUtils } from '@0xproject/order-utils';
-import { DoneCallback, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { BlockchainLifecycle, callbackErrorReporter } from '@0x/dev-utils';
+import { FillScenarios } from '@0x/fill-scenarios';
+import { assetDataUtils, orderHashUtils } from '@0x/order-utils';
+import { DoneCallback, SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 import * as chai from 'chai';
 import { BlockParamLiteral } from 'ethereum-types';
 import 'mocha';
 
-import {
-    ContractWrappers,
-    DecodedLogEvent,
-    ExchangeCancelEventArgs,
-    ExchangeEvents,
-    ExchangeFillEventArgs,
-    OrderStatus,
-} from '../src';
+import { ContractWrappers, ExchangeCancelEventArgs, ExchangeEvents, ExchangeFillEventArgs, OrderStatus } from '../src';
+import { DecodedLogEvent } from '../src/types';
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { tokenUtils } from './utils/token_utils';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
@@ -33,37 +28,38 @@ describe('ExchangeWrapper', () => {
     let exchangeContractAddress: string;
     let makerTokenAddress: string;
     let takerTokenAddress: string;
-    let coinbase: string;
     let makerAddress: string;
     let anotherMakerAddress: string;
     let takerAddress: string;
     let makerAssetData: string;
     let takerAssetData: string;
-    let feeRecipient: string;
     let txHash: string;
     const fillableAmount = new BigNumber(5);
     const takerTokenFillAmount = new BigNumber(5);
     let signedOrder: SignedOrder;
     let anotherSignedOrder: SignedOrder;
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-        blockPollingIntervalMs: 0,
-    };
+
     before(async () => {
+        const contractAddresses = await migrateOnceAsync();
         await blockchainLifecycle.startAsync();
+        const config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
         contractWrappers = new ContractWrappers(provider, config);
-        exchangeContractAddress = contractWrappers.exchange.getContractAddress();
+        exchangeContractAddress = contractWrappers.exchange.address;
         userAddresses = await web3Wrapper.getAvailableAddressesAsync();
-        zrxTokenAddress = tokenUtils.getProtocolTokenAddress();
+        zrxTokenAddress = contractWrappers.exchange.zrxTokenAddress;
         fillScenarios = new FillScenarios(
             provider,
             userAddresses,
             zrxTokenAddress,
             exchangeContractAddress,
-            contractWrappers.erc20Proxy.getContractAddress(),
-            contractWrappers.erc721Proxy.getContractAddress(),
+            contractWrappers.erc20Proxy.address,
+            contractWrappers.erc721Proxy.address,
         );
-        [coinbase, makerAddress, takerAddress, feeRecipient, anotherMakerAddress] = userAddresses;
+        [, makerAddress, takerAddress, , anotherMakerAddress] = userAddresses;
         [makerTokenAddress, takerTokenAddress] = tokenUtils.getDummyERC20TokenAddresses();
         [makerAssetData, takerAssetData] = [
             assetDataUtils.encodeERC20AssetData(makerTokenAddress),
@@ -335,11 +331,11 @@ describe('ExchangeWrapper', () => {
         it('should fill or kill a valid order', async () => {
             const erc20ProxyId = await contractWrappers.erc20Proxy.getProxyIdAsync();
             const erc20ProxyAddressById = await contractWrappers.exchange.getAssetProxyBySignatureAsync(erc20ProxyId);
-            const erc20ProxyAddress = contractWrappers.erc20Proxy.getContractAddress();
+            const erc20ProxyAddress = contractWrappers.erc20Proxy.address;
             expect(erc20ProxyAddressById).to.be.equal(erc20ProxyAddress);
             const erc721ProxyId = await contractWrappers.erc721Proxy.getProxyIdAsync();
             const erc721ProxyAddressById = await contractWrappers.exchange.getAssetProxyBySignatureAsync(erc721ProxyId);
-            const erc721ProxyAddress = contractWrappers.erc721Proxy.getContractAddress();
+            const erc721ProxyAddress = contractWrappers.erc721Proxy.address;
             expect(erc721ProxyAddressById).to.be.equal(erc721ProxyAddress);
         });
     });
@@ -364,7 +360,7 @@ describe('ExchangeWrapper', () => {
     describe('#getVersionAsync', () => {
         it('should return version the hash', async () => {
             const version = await contractWrappers.exchange.getVersionAsync();
-            const VERSION = '2.0.1-alpha';
+            const VERSION = '2.0.0';
             expect(version).to.be.equal(VERSION);
         });
     });
@@ -414,7 +410,7 @@ describe('ExchangeWrapper', () => {
                 await contractWrappers.exchange.cancelOrderAsync(signedOrder);
             })().catch(done);
         });
-        it('Outstanding subscriptions are cancelled when contractWrappers.setProvider called', (done: DoneCallback) => {
+        it('Outstanding subscriptions are cancelled when contractWrappers.unsubscribeAll called', (done: DoneCallback) => {
             (async () => {
                 const callbackNeverToBeCalled = callbackErrorReporter.reportNodeCallbackErrors(done)(
                     (logEvent: DecodedLogEvent<ExchangeFillEventArgs>) => {
@@ -423,7 +419,7 @@ describe('ExchangeWrapper', () => {
                 );
                 contractWrappers.exchange.subscribe(ExchangeEvents.Fill, indexFilterValues, callbackNeverToBeCalled);
 
-                contractWrappers.setProvider(provider, constants.TESTRPC_NETWORK_ID);
+                contractWrappers.unsubscribeAll();
 
                 const callback = callbackErrorReporter.reportNodeCallbackErrors(done)(
                     (logEvent: DecodedLogEvent<ExchangeFillEventArgs>) => {
@@ -460,13 +456,6 @@ describe('ExchangeWrapper', () => {
             })().catch(done);
         });
     });
-    describe('#getZRXTokenAddressAsync', () => {
-        it('gets the same token as is in token registry', () => {
-            const zrxAddressFromExchangeWrapper = contractWrappers.exchange.getZRXTokenAddress();
-            const zrxAddress = tokenUtils.getProtocolTokenAddress();
-            expect(zrxAddressFromExchangeWrapper).to.equal(zrxAddress);
-        });
-    });
     describe('#getLogsAsync', () => {
         const blockRange = {
             fromBlock: 0,
diff --git a/packages/contract-wrappers/test/forwarder_wrapper_test.ts b/packages/contract-wrappers/test/forwarder_wrapper_test.ts
index 3f3b40e0b..ff4ff8b67 100644
--- a/packages/contract-wrappers/test/forwarder_wrapper_test.ts
+++ b/packages/contract-wrappers/test/forwarder_wrapper_test.ts
@@ -1,23 +1,16 @@
-import { BlockchainLifecycle, callbackErrorReporter } from '@0xproject/dev-utils';
-import { FillScenarios } from '@0xproject/fill-scenarios';
-import { assetDataUtils, orderHashUtils } from '@0xproject/order-utils';
-import { DoneCallback, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { BlockchainLifecycle } from '@0x/dev-utils';
+import { FillScenarios } from '@0x/fill-scenarios';
+import { assetDataUtils } from '@0x/order-utils';
+import { SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 import * as chai from 'chai';
-import { BlockParamLiteral } from 'ethereum-types';
 import 'mocha';
 
-import {
-    ContractWrappers,
-    DecodedLogEvent,
-    ExchangeCancelEventArgs,
-    ExchangeEvents,
-    ExchangeFillEventArgs,
-    OrderStatus,
-} from '../src';
+import { ContractWrappers, OrderStatus } from '../src';
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { tokenUtils } from './utils/token_utils';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
@@ -25,24 +18,16 @@ chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 
+// tslint:disable:custom-no-magic-numbers
 describe('ForwarderWrapper', () => {
-    const contractWrappersConfig = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-        blockPollingIntervalMs: 0,
-    };
     const fillableAmount = new BigNumber(5);
-    const takerTokenFillAmount = new BigNumber(5);
     let contractWrappers: ContractWrappers;
     let fillScenarios: FillScenarios;
-    let forwarderContractAddress: string;
     let exchangeContractAddress: string;
     let zrxTokenAddress: string;
     let userAddresses: string[];
-    let coinbase: string;
     let makerAddress: string;
     let takerAddress: string;
-    let feeRecipient: string;
-    let anotherMakerAddress: string;
     let makerTokenAddress: string;
     let takerTokenAddress: string;
     let makerAssetData: string;
@@ -50,23 +35,28 @@ describe('ForwarderWrapper', () => {
     let signedOrder: SignedOrder;
     let anotherSignedOrder: SignedOrder;
     before(async () => {
+        const contractAddresses = await migrateOnceAsync();
         await blockchainLifecycle.startAsync();
-        contractWrappers = new ContractWrappers(provider, contractWrappersConfig);
-        forwarderContractAddress = contractWrappers.forwarder.getContractAddress();
-        exchangeContractAddress = contractWrappers.exchange.getContractAddress();
+        const config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
+        contractWrappers = new ContractWrappers(provider, config);
+        exchangeContractAddress = contractWrappers.exchange.address;
         userAddresses = await web3Wrapper.getAvailableAddressesAsync();
-        zrxTokenAddress = tokenUtils.getProtocolTokenAddress();
+        zrxTokenAddress = contractWrappers.exchange.zrxTokenAddress;
         fillScenarios = new FillScenarios(
             provider,
             userAddresses,
             zrxTokenAddress,
             exchangeContractAddress,
-            contractWrappers.erc20Proxy.getContractAddress(),
-            contractWrappers.erc721Proxy.getContractAddress(),
+            contractWrappers.erc20Proxy.address,
+            contractWrappers.erc721Proxy.address,
         );
-        [coinbase, makerAddress, takerAddress, feeRecipient, anotherMakerAddress] = userAddresses;
+        [, makerAddress, takerAddress] = userAddresses;
         [makerTokenAddress] = tokenUtils.getDummyERC20TokenAddresses();
-        takerTokenAddress = tokenUtils.getWethTokenAddress();
+        takerTokenAddress = contractWrappers.forwarder.etherTokenAddress;
         [makerAssetData, takerAssetData] = [
             assetDataUtils.encodeERC20AssetData(makerTokenAddress),
             assetDataUtils.encodeERC20AssetData(takerTokenAddress),
@@ -110,6 +100,25 @@ describe('ForwarderWrapper', () => {
             expect(ordersInfo[0].orderStatus).to.be.equal(OrderStatus.FULLY_FILLED);
             expect(ordersInfo[1].orderStatus).to.be.equal(OrderStatus.FULLY_FILLED);
         });
+        it('should throw when invalid transaction and shouldValidate is true', async () => {
+            const signedOrders = [signedOrder];
+            // request more makerAsset than what is available
+            const makerAssetFillAmount = signedOrder.makerAssetAmount.plus(100);
+            return expect(
+                contractWrappers.forwarder.marketBuyOrdersWithEthAsync(
+                    signedOrders,
+                    makerAssetFillAmount,
+                    takerAddress,
+                    makerAssetFillAmount,
+                    [],
+                    0,
+                    constants.NULL_ADDRESS,
+                    {
+                        shouldValidate: true,
+                    },
+                ),
+            ).to.be.rejectedWith('COMPLETE_FILL_FAILED');
+        });
     });
     describe('#marketSellOrdersWithEthAsync', () => {
         it('should market sell orders with eth', async () => {
@@ -126,5 +135,33 @@ describe('ForwarderWrapper', () => {
             expect(ordersInfo[1].orderStatus).to.be.equal(OrderStatus.FILLABLE);
             expect(ordersInfo[1].orderTakerAssetFilledAmount).to.be.bignumber.equal(new BigNumber(4)); // only 95% of ETH is sold
         });
+        it('should throw when invalid transaction and shouldValidate is true', async () => {
+            // create an order with fees, we try to fill it but we do not provide enough ETH to cover the fees
+            const signedOrderWithFee = await fillScenarios.createFillableSignedOrderWithFeesAsync(
+                makerAssetData,
+                takerAssetData,
+                constants.ZERO_AMOUNT,
+                new BigNumber(100),
+                makerAddress,
+                constants.NULL_ADDRESS,
+                fillableAmount,
+                constants.NULL_ADDRESS,
+            );
+            const signedOrders = [signedOrderWithFee];
+            const makerAssetFillAmount = signedOrder.makerAssetAmount;
+            return expect(
+                contractWrappers.forwarder.marketSellOrdersWithEthAsync(
+                    signedOrders,
+                    takerAddress,
+                    makerAssetFillAmount,
+                    [],
+                    0,
+                    constants.NULL_ADDRESS,
+                    {
+                        shouldValidate: true,
+                    },
+                ),
+            ).to.be.rejectedWith('COMPLETE_FILL_FAILED');
+        });
     });
 });
diff --git a/packages/contract-wrappers/test/global_hooks.ts b/packages/contract-wrappers/test/global_hooks.ts
index 8731318e7..e23739b59 100644
--- a/packages/contract-wrappers/test/global_hooks.ts
+++ b/packages/contract-wrappers/test/global_hooks.ts
@@ -1,17 +1,6 @@
-import { devConstants } from '@0xproject/dev-utils';
-import { runV2MigrationsAsync } from '@0xproject/migrations';
-
-import { provider } from './utils/web3_wrapper';
-
-before('migrate contracts', async function(): Promise<void> {
+before('set up mocha', async function(): Promise<void> {
     // HACK: Since the migrations take longer then our global mocha timeout limit
     // we manually increase it for this before hook.
     const mochaTestTimeoutMs = 50000;
     this.timeout(mochaTestTimeoutMs); // tslint:disable-line:no-invalid-this
-    const txDefaults = {
-        gas: devConstants.GAS_LIMIT,
-        from: devConstants.TESTRPC_FIRST_ADDRESS,
-    };
-    const artifactsDir = `src/artifacts`;
-    await runV2MigrationsAsync(provider, artifactsDir, txDefaults);
 });
diff --git a/packages/contract-wrappers/test/order_validator_wrapper_test.ts b/packages/contract-wrappers/test/order_validator_wrapper_test.ts
new file mode 100644
index 000000000..da3f99e72
--- /dev/null
+++ b/packages/contract-wrappers/test/order_validator_wrapper_test.ts
@@ -0,0 +1,146 @@
+import { ContractAddresses } from '@0x/contract-addresses';
+import { BlockchainLifecycle } from '@0x/dev-utils';
+import { FillScenarios } from '@0x/fill-scenarios';
+import { assetDataUtils } from '@0x/order-utils';
+import { SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import * as chai from 'chai';
+import * as _ from 'lodash';
+import 'mocha';
+
+import { ContractWrappers, OrderStatus } from '../src';
+import { OrderInfo, TraderInfo } from '../src/types';
+
+import { chaiSetup } from './utils/chai_setup';
+import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
+import { tokenUtils } from './utils/token_utils';
+import { provider, web3Wrapper } from './utils/web3_wrapper';
+
+chaiSetup.configure();
+const expect = chai.expect;
+const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
+
+describe('OrderValidator', () => {
+    const fillableAmount = new BigNumber(5);
+    let contractWrappers: ContractWrappers;
+    let fillScenarios: FillScenarios;
+    let exchangeContractAddress: string;
+    let zrxTokenAddress: string;
+    let zrxTokenAssetData: string;
+    let userAddresses: string[];
+    let coinbase: string;
+    let makerAddress: string;
+    let takerAddress: string;
+    let feeRecipient: string;
+    let anotherMakerAddress: string;
+    let makerTokenAddress: string;
+    let takerTokenAddress: string;
+    let makerAssetData: string;
+    let takerAssetData: string;
+    let signedOrder: SignedOrder;
+    let anotherSignedOrder: SignedOrder;
+    let contractAddresses: ContractAddresses;
+
+    before(async () => {
+        contractAddresses = await migrateOnceAsync();
+        await blockchainLifecycle.startAsync();
+        const config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
+        contractWrappers = new ContractWrappers(provider, config);
+        exchangeContractAddress = contractWrappers.exchange.address;
+        userAddresses = await web3Wrapper.getAvailableAddressesAsync();
+        zrxTokenAddress = contractWrappers.exchange.zrxTokenAddress;
+        zrxTokenAssetData = assetDataUtils.encodeERC20AssetData(zrxTokenAddress);
+        fillScenarios = new FillScenarios(
+            provider,
+            userAddresses,
+            zrxTokenAddress,
+            exchangeContractAddress,
+            contractWrappers.erc20Proxy.address,
+            contractWrappers.erc721Proxy.address,
+        );
+        [coinbase, makerAddress, takerAddress, feeRecipient, anotherMakerAddress] = userAddresses;
+        [makerTokenAddress] = tokenUtils.getDummyERC20TokenAddresses();
+        takerTokenAddress = contractAddresses.etherToken;
+        [makerAssetData, takerAssetData] = [
+            assetDataUtils.encodeERC20AssetData(makerTokenAddress),
+            assetDataUtils.encodeERC20AssetData(takerTokenAddress),
+        ];
+
+        signedOrder = await fillScenarios.createFillableSignedOrderAsync(
+            makerAssetData,
+            takerAssetData,
+            makerAddress,
+            constants.NULL_ADDRESS,
+            fillableAmount,
+        );
+        anotherSignedOrder = await fillScenarios.createFillableSignedOrderAsync(
+            zrxTokenAssetData,
+            takerAssetData,
+            makerAddress,
+            constants.NULL_ADDRESS,
+            fillableAmount,
+        );
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    describe('#getOrdersAndTradersInfoAsync', () => {
+        let signedOrders: SignedOrder[];
+        let takerAddresses: string[];
+        let ordersInfo: OrderInfo[];
+        let tradersInfo: TraderInfo[];
+        beforeEach(async () => {
+            signedOrders = [signedOrder, anotherSignedOrder];
+            takerAddresses = [takerAddress, takerAddress];
+            const ordersAndTradersInfo = await contractWrappers.orderValidator.getOrdersAndTradersInfoAsync(
+                signedOrders,
+                takerAddresses,
+            );
+            ordersInfo = _.map(ordersAndTradersInfo, orderAndTraderInfo => orderAndTraderInfo.orderInfo);
+            tradersInfo = _.map(ordersAndTradersInfo, orderAndTraderInfo => orderAndTraderInfo.traderInfo);
+        });
+        it('should return the same number of order infos and trader infos as input orders', async () => {
+            expect(ordersInfo.length).to.be.equal(signedOrders.length);
+            expect(tradersInfo.length).to.be.equal(takerAddresses.length);
+        });
+        it('should return correct on-chain order info for input orders', async () => {
+            const firstOrderInfo = ordersInfo[0];
+            const secondOrderInfo = ordersInfo[1];
+            expect(firstOrderInfo.orderStatus).to.be.equal(OrderStatus.FILLABLE);
+            expect(firstOrderInfo.orderTakerAssetFilledAmount).to.bignumber.equal(constants.ZERO_AMOUNT);
+            expect(secondOrderInfo.orderStatus).to.be.equal(OrderStatus.FILLABLE);
+            expect(secondOrderInfo.orderTakerAssetFilledAmount).to.bignumber.equal(constants.ZERO_AMOUNT);
+        });
+        it('should return correct on-chain trader info for input takers', async () => {
+            const firstTraderInfo = tradersInfo[0];
+            const secondTraderInfo = tradersInfo[1];
+            expect(firstTraderInfo.makerBalance).to.bignumber.equal(new BigNumber(5));
+            expect(firstTraderInfo.makerAllowance).to.bignumber.equal(new BigNumber(5));
+            expect(firstTraderInfo.takerBalance).to.bignumber.equal(new BigNumber(0));
+            expect(firstTraderInfo.takerAllowance).to.bignumber.equal(new BigNumber(0));
+            expect(firstTraderInfo.makerZrxBalance).to.bignumber.equal(new BigNumber(5));
+            expect(firstTraderInfo.makerZrxAllowance).to.bignumber.equal(new BigNumber(5));
+            expect(firstTraderInfo.takerZrxBalance).to.bignumber.equal(new BigNumber(0));
+            expect(firstTraderInfo.takerZrxAllowance).to.bignumber.equal(new BigNumber(0));
+            expect(secondTraderInfo.makerBalance).to.bignumber.equal(new BigNumber(5));
+            expect(secondTraderInfo.makerAllowance).to.bignumber.equal(new BigNumber(5));
+            expect(secondTraderInfo.takerBalance).to.bignumber.equal(new BigNumber(0));
+            expect(secondTraderInfo.takerAllowance).to.bignumber.equal(new BigNumber(0));
+            expect(secondTraderInfo.makerZrxBalance).to.bignumber.equal(new BigNumber(5));
+            expect(secondTraderInfo.makerZrxAllowance).to.bignumber.equal(new BigNumber(5));
+            expect(secondTraderInfo.takerZrxBalance).to.bignumber.equal(new BigNumber(0));
+            expect(secondTraderInfo.takerZrxAllowance).to.bignumber.equal(new BigNumber(0));
+        });
+    });
+});
diff --git a/packages/contract-wrappers/test/revert_validation_test.ts b/packages/contract-wrappers/test/revert_validation_test.ts
new file mode 100644
index 000000000..efd5dd61f
--- /dev/null
+++ b/packages/contract-wrappers/test/revert_validation_test.ts
@@ -0,0 +1,115 @@
+import { BlockchainLifecycle, devConstants, web3Factory } from '@0x/dev-utils';
+import { FillScenarios } from '@0x/fill-scenarios';
+import { runMigrationsAsync } from '@0x/migrations';
+import { assetDataUtils } from '@0x/order-utils';
+import { SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import * as chai from 'chai';
+import 'mocha';
+
+import { ContractWrappers } from '../src';
+
+import { chaiSetup } from './utils/chai_setup';
+import { constants } from './utils/constants';
+import { tokenUtils } from './utils/token_utils';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('Revert Validation ExchangeWrapper', () => {
+    let contractWrappers: ContractWrappers;
+    let userAddresses: string[];
+    let fillScenarios: FillScenarios;
+    let makerTokenAddress: string;
+    let takerTokenAddress: string;
+    let makerAddress: string;
+    let takerAddress: string;
+    let makerAssetData: string;
+    let takerAssetData: string;
+    let txHash: string;
+    let blockchainLifecycle: BlockchainLifecycle;
+    let web3Wrapper: Web3Wrapper;
+    const fillableAmount = new BigNumber(5);
+    const takerTokenFillAmount = new BigNumber(5);
+    let signedOrder: SignedOrder;
+    before(async () => {
+        // vmErrorsOnRPCResponse is useful for quick feedback and testing during development
+        // but is not the default behaviour in production. Here we ensure our failure cases
+        // are handled in an environment which behaves similar to production
+        const provider = web3Factory.getRpcProvider({
+            shouldUseInProcessGanache: true,
+            shouldThrowErrorsOnGanacheRPCResponse: false,
+        });
+        web3Wrapper = new Web3Wrapper(provider);
+        blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
+        // Re-deploy the artifacts in this provider, rather than in the default provider exposed in
+        // the beforeAll hook. This is due to the fact that the default provider enabled vmErrorsOnRPCResponse
+        // and we are explicity testing with vmErrorsOnRPCResponse disabled.
+        const txDefaults = {
+            gas: devConstants.GAS_LIMIT,
+            from: devConstants.TESTRPC_FIRST_ADDRESS,
+        };
+        await blockchainLifecycle.startAsync();
+        const contractAddresses = await runMigrationsAsync(provider, txDefaults);
+        const config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
+        contractWrappers = new ContractWrappers(provider, config);
+        userAddresses = await web3Wrapper.getAvailableAddressesAsync();
+        fillScenarios = new FillScenarios(
+            provider,
+            userAddresses,
+            contractAddresses.zrxToken,
+            contractAddresses.exchange,
+            contractAddresses.erc20Proxy,
+            contractAddresses.erc721Proxy,
+        );
+        [, makerAddress, takerAddress] = userAddresses;
+        [makerTokenAddress, takerTokenAddress] = tokenUtils.getDummyERC20TokenAddresses();
+        [makerAssetData, takerAssetData] = [
+            assetDataUtils.encodeERC20AssetData(makerTokenAddress),
+            assetDataUtils.encodeERC20AssetData(takerTokenAddress),
+        ];
+        signedOrder = await fillScenarios.createFillableSignedOrderAsync(
+            makerAssetData,
+            takerAssetData,
+            makerAddress,
+            takerAddress,
+            fillableAmount,
+        );
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    describe('#fillOrderAsync', () => {
+        it('should throw the revert reason when shouldValidate is true and a fill would revert', async () => {
+            // Create a scenario where the fill will revert
+            const makerTokenBalance = await contractWrappers.erc20Token.getBalanceAsync(
+                makerTokenAddress,
+                makerAddress,
+            );
+            // Transfer all of the tokens from maker to create a failure scenario
+            txHash = await contractWrappers.erc20Token.transferAsync(
+                makerTokenAddress,
+                makerAddress,
+                takerAddress,
+                makerTokenBalance,
+            );
+            await web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
+            return expect(
+                contractWrappers.exchange.fillOrderAsync(signedOrder, takerTokenFillAmount, takerAddress, {
+                    shouldValidate: true,
+                }),
+            ).to.be.rejectedWith('TRANSFER_FAILED');
+        });
+    });
+});
diff --git a/packages/contract-wrappers/test/subscription_test.ts b/packages/contract-wrappers/test/subscription_test.ts
index 80d17576f..0fa6af40d 100644
--- a/packages/contract-wrappers/test/subscription_test.ts
+++ b/packages/contract-wrappers/test/subscription_test.ts
@@ -1,14 +1,20 @@
-import { BlockchainLifecycle, callbackErrorReporter } from '@0xproject/dev-utils';
-import { DoneCallback } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { BlockchainLifecycle } from '@0x/dev-utils';
+import { DoneCallback } from '@0x/types';
 import * as _ from 'lodash';
 import 'mocha';
 import * as Sinon from 'sinon';
 
-import { ContractWrappers, DecodedLogEvent, ERC20TokenApprovalEventArgs, ERC20TokenEvents, Token } from '../src';
+import {
+    ContractWrappers,
+    ContractWrappersConfig,
+    DecodedLogEvent,
+    ERC20TokenApprovalEventArgs,
+    ERC20TokenEvents,
+} from '../src';
 
 import { chaiSetup } from './utils/chai_setup';
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { tokenUtils } from './utils/token_utils';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
@@ -17,17 +23,15 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 
 describe('SubscriptionTest', () => {
     let contractWrappers: ContractWrappers;
-    let userAddresses: string[];
-    let coinbase: string;
-    let addressWithoutFunds: string;
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-    };
+    let config: ContractWrappersConfig;
+
     before(async () => {
+        const contractAddresses = await migrateOnceAsync();
+        config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+        };
         contractWrappers = new ContractWrappers(provider, config);
-        userAddresses = await web3Wrapper.getAvailableAddressesAsync();
-        coinbase = userAddresses[0];
-        addressWithoutFunds = userAddresses[1];
     });
     beforeEach(async () => {
         await blockchainLifecycle.startAsync();
@@ -38,7 +42,6 @@ describe('SubscriptionTest', () => {
     describe('#subscribe', () => {
         const indexFilterValues = {};
         let tokenAddress: string;
-        const allowanceAmount = new BigNumber(42);
         let stubs: Sinon.SinonStub[] = [];
         before(() => {
             const tokenAddresses = tokenUtils.getDummyERC20TokenAddresses();
@@ -52,7 +55,7 @@ describe('SubscriptionTest', () => {
         it('Should allow unsubscribeAll to be called successfully after an error', (done: DoneCallback) => {
             (async () => {
                 const callback = (err: Error | null, _logEvent?: DecodedLogEvent<ERC20TokenApprovalEventArgs>) =>
-                    _.noop;
+                    _.noop.bind(_);
                 contractWrappers.erc20Token.subscribe(
                     tokenAddress,
                     ERC20TokenEvents.Approval,
@@ -60,7 +63,7 @@ describe('SubscriptionTest', () => {
                     callback,
                 );
                 stubs = [
-                    Sinon.stub((contractWrappers as any)._web3Wrapper, 'getBlockAsync').throws(
+                    Sinon.stub((contractWrappers as any)._web3Wrapper, 'getBlockIfExistsAsync').throws(
                         new Error('JSON RPC error'),
                     ),
                 ];
diff --git a/packages/contract-wrappers/test/transaction_encoder_test.ts b/packages/contract-wrappers/test/transaction_encoder_test.ts
index 10222dbc1..ef9eb2cf3 100644
--- a/packages/contract-wrappers/test/transaction_encoder_test.ts
+++ b/packages/contract-wrappers/test/transaction_encoder_test.ts
@@ -1,14 +1,15 @@
-import { BlockchainLifecycle } from '@0xproject/dev-utils';
-import { FillScenarios } from '@0xproject/fill-scenarios';
-import { assetDataUtils, ecSignOrderHashAsync, generatePseudoRandomSalt, orderHashUtils } from '@0xproject/order-utils';
-import { SignedOrder, SignerType } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
+import { BlockchainLifecycle } from '@0x/dev-utils';
+import { FillScenarios } from '@0x/fill-scenarios';
+import { assetDataUtils, generatePseudoRandomSalt, orderHashUtils, signatureUtils } from '@0x/order-utils';
+import { SignedOrder } from '@0x/types';
+import { BigNumber } from '@0x/utils';
 import 'mocha';
 
 import { ContractWrappers } from '../src';
 import { TransactionEncoder } from '../src/utils/transaction_encoder';
 
 import { constants } from './utils/constants';
+import { migrateOnceAsync } from './utils/migrate';
 import { tokenUtils } from './utils/token_utils';
 import { provider, web3Wrapper } from './utils/web3_wrapper';
 
@@ -31,23 +32,26 @@ describe('TransactionEncoder', () => {
     const fillableAmount = new BigNumber(5);
     const takerTokenFillAmount = new BigNumber(5);
     let signedOrder: SignedOrder;
-    const config = {
-        networkId: constants.TESTRPC_NETWORK_ID,
-        blockPollingIntervalMs: 0,
-    };
+
     before(async () => {
+        const contractAddresses = await migrateOnceAsync();
         await blockchainLifecycle.startAsync();
+        const config = {
+            networkId: constants.TESTRPC_NETWORK_ID,
+            contractAddresses,
+            blockPollingIntervalMs: 10,
+        };
         contractWrappers = new ContractWrappers(provider, config);
-        exchangeContractAddress = contractWrappers.exchange.getContractAddress();
+        exchangeContractAddress = contractWrappers.exchange.address;
         userAddresses = await web3Wrapper.getAvailableAddressesAsync();
-        const zrxTokenAddress = tokenUtils.getProtocolTokenAddress();
+        const zrxTokenAddress = contractWrappers.exchange.zrxTokenAddress;
         fillScenarios = new FillScenarios(
             provider,
             userAddresses,
             zrxTokenAddress,
             exchangeContractAddress,
-            contractWrappers.erc20Proxy.getContractAddress(),
-            contractWrappers.erc721Proxy.getContractAddress(),
+            contractWrappers.erc20Proxy.address,
+            contractWrappers.erc721Proxy.address,
         );
         [coinbase, makerAddress, takerAddress, senderAddress] = userAddresses;
         [makerTokenAddress, takerTokenAddress] = tokenUtils.getDummyERC20TokenAddresses();
@@ -80,12 +84,7 @@ describe('TransactionEncoder', () => {
         ): Promise<void> => {
             const salt = generatePseudoRandomSalt();
             const encodedTransaction = encoder.getTransactionHex(data, salt, signerAddress);
-            const signature = await ecSignOrderHashAsync(
-                provider,
-                encodedTransaction,
-                signerAddress,
-                SignerType.Default,
-            );
+            const signature = await signatureUtils.ecSignHashAsync(provider, encodedTransaction, signerAddress);
             txHash = await contractWrappers.exchange.executeTransactionAsync(
                 salt,
                 signerAddress,
diff --git a/packages/contract-wrappers/test/utils/constants.ts b/packages/contract-wrappers/test/utils/constants.ts
index 60c3370a2..ca6c574e4 100644
--- a/packages/contract-wrappers/test/utils/constants.ts
+++ b/packages/contract-wrappers/test/utils/constants.ts
@@ -1,4 +1,4 @@
-import { BigNumber } from '@0xproject/utils';
+import { BigNumber } from '@0x/utils';
 
 export const constants = {
     NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
@@ -15,4 +15,5 @@ export const constants = {
     DUMMY_TOKEN_TOTAL_SUPPLY: new BigNumber(10 ** 27), // tslint:disable-line:custom-no-magic-numbers
     NUM_DUMMY_ERC20_TO_DEPLOY: 3,
     NUM_DUMMY_ERC721_TO_DEPLOY: 1,
+    ZERO_AMOUNT: new BigNumber(0),
 };
diff --git a/packages/contract-wrappers/test/utils/migrate.ts b/packages/contract-wrappers/test/utils/migrate.ts
new file mode 100644
index 000000000..665ce0faa
--- /dev/null
+++ b/packages/contract-wrappers/test/utils/migrate.ts
@@ -0,0 +1,18 @@
+import { ContractAddresses } from '@0x/contract-addresses';
+import { devConstants } from '@0x/dev-utils';
+import { runMigrationsOnceAsync } from '@0x/migrations';
+
+import { provider } from './web3_wrapper';
+
+/**
+ * Configures and runs the migrations exactly once. Any subsequent times this is
+ * called, it returns the cached addresses.
+ * @returns The addresses of contracts that were deployed during the migrations.
+ */
+export async function migrateOnceAsync(): Promise<ContractAddresses> {
+    const txDefaults = {
+        gas: devConstants.GAS_LIMIT,
+        from: devConstants.TESTRPC_FIRST_ADDRESS,
+    };
+    return runMigrationsOnceAsync(provider, txDefaults);
+}
diff --git a/packages/contract-wrappers/test/utils/token_utils.ts b/packages/contract-wrappers/test/utils/token_utils.ts
index 06a82ff6e..f8a88637f 100644
--- a/packages/contract-wrappers/test/utils/token_utils.ts
+++ b/packages/contract-wrappers/test/utils/token_utils.ts
@@ -1,14 +1,13 @@
-import { generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { BigNumber } from '@0xproject/utils';
+import { DummyERC721TokenContract } from '@0x/abi-gen-wrappers';
+import { DummyERC721Token } from '@0x/contract-artifacts';
+import { generatePseudoRandomSalt } from '@0x/order-utils';
+import { BigNumber } from '@0x/utils';
 
-import { artifacts } from '../../src/artifacts';
-import { DummyERC721TokenContract } from '../../src/contract_wrappers/generated/dummy_erc721_token';
-
-import { constants } from './constants';
 import { provider, txDefaults, web3Wrapper } from './web3_wrapper';
 
 // Those addresses come from migrations. They're deterministic so it's relatively safe to hard-code them here.
 // Before we were fetching them from the TokenRegistry but now we can't as it's deprecated and removed.
+// TODO(albrow): Import these from the migrations package instead of hard-coding them.
 const DUMMY_ERC_20_ADRESSES = [
     '0x6dfff22588be9b3ef8cf0ad6dc9b84796f9fb45f',
     '0xcfc18cec799fbd1793b5c43e773c98d4d61cc2db',
@@ -20,12 +19,6 @@ const DUMMY_ERC_20_ADRESSES = [
 const DUMMY_ERC_721_ADRESSES = ['0x131855dda0aaff096f6854854c55a4debf61077a'];
 
 export const tokenUtils = {
-    getProtocolTokenAddress(): string {
-        return artifacts.ZRXToken.networks[constants.TESTRPC_NETWORK_ID].address;
-    },
-    getWethTokenAddress(): string {
-        return artifacts.EtherToken.networks[constants.TESTRPC_NETWORK_ID].address;
-    },
     getDummyERC20TokenAddresses(): string[] {
         return DUMMY_ERC_20_ADRESSES;
     },
@@ -33,12 +26,7 @@ export const tokenUtils = {
         return DUMMY_ERC_721_ADRESSES;
     },
     async mintDummyERC721Async(address: string, tokenOwner: string): Promise<BigNumber> {
-        const erc721 = new DummyERC721TokenContract(
-            artifacts.DummyERC721Token.compilerOutput.abi,
-            address,
-            provider,
-            txDefaults,
-        );
+        const erc721 = new DummyERC721TokenContract(DummyERC721Token.compilerOutput.abi, address, provider, txDefaults);
         const tokenId = generatePseudoRandomSalt();
         const txHash = await erc721.mint.sendTransactionAsync(tokenOwner, tokenId);
         web3Wrapper.awaitTransactionSuccessAsync(txHash);
diff --git a/packages/contract-wrappers/test/utils/web3_wrapper.ts b/packages/contract-wrappers/test/utils/web3_wrapper.ts
index 02c8c5918..4e86ebeba 100644
--- a/packages/contract-wrappers/test/utils/web3_wrapper.ts
+++ b/packages/contract-wrappers/test/utils/web3_wrapper.ts
@@ -1,5 +1,5 @@
-import { devConstants, web3Factory } from '@0xproject/dev-utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import { devConstants, web3Factory } from '@0x/dev-utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
 import { Provider } from 'ethereum-types';
 
 const txDefaults = {
diff --git a/packages/contract-wrappers/tsconfig.json b/packages/contract-wrappers/tsconfig.json
index e35816553..2ee711adc 100644
--- a/packages/contract-wrappers/tsconfig.json
+++ b/packages/contract-wrappers/tsconfig.json
@@ -1,7 +1,8 @@
 {
     "extends": "../../tsconfig",
     "compilerOptions": {
-        "outDir": "lib"
+        "outDir": "lib",
+        "rootDir": "."
     },
     "include": ["./src/**/*", "./test/**/*"]
 }
diff --git a/packages/contract-wrappers/tslint.json b/packages/contract-wrappers/tslint.json
index ffaefe83a..dd9053357 100644
--- a/packages/contract-wrappers/tslint.json
+++ b/packages/contract-wrappers/tslint.json
@@ -1,3 +1,3 @@
 {
-    "extends": ["@0xproject/tslint-config"]
+    "extends": ["@0x/tslint-config"]
 }
diff --git a/packages/contract-wrappers/typedoc-tsconfig.json b/packages/contract-wrappers/typedoc-tsconfig.json
new file mode 100644
index 000000000..c9b0af1ae
--- /dev/null
+++ b/packages/contract-wrappers/typedoc-tsconfig.json
@@ -0,0 +1,7 @@
+{
+    "extends": "../../typedoc-tsconfig",
+    "compilerOptions": {
+        "outDir": "lib"
+    },
+    "include": ["./src/**/*", "./test/**/*"]
+}