Refactor @0x/contracts-utils from @0x/contracts-core

47 files changed, 330 insertions, 55 deletions

diff --git a/contracts/core/compiler.json b/contracts/core/compiler.json
index 1ffc26b05..8d9732794 100644
--- a/contracts/core/compiler.json
+++ b/contracts/core/compiler.json
@@ -44,8 +44,6 @@
         "ReentrantERC20Token",
         "TestAssetProxyOwner",
         "TestAssetProxyDispatcher",
-        "TestConstants",
-        "TestLibBytes",
         "TestLibs",
         "TestExchangeInternals",
         "TestSignatureValidator",
diff --git a/contracts/core/contracts/examples/Wallet/Wallet.sol b/contracts/core/contracts/examples/Wallet/Wallet.sol
index b75021a31..3738be841 100644
--- a/contracts/core/contracts/examples/Wallet/Wallet.sol
+++ b/contracts/core/contracts/examples/Wallet/Wallet.sol
@@ -19,7 +19,7 @@
 pragma solidity 0.4.24;
 
 import "../../protocol/Exchange/interfaces/IWallet.sol";
-import "../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 
 
 contract Wallet is 
diff --git a/contracts/core/contracts/examples/Whitelist/Whitelist.sol b/contracts/core/contracts/examples/Whitelist/Whitelist.sol
index e4e25038c..61c21c095 100644
--- a/contracts/core/contracts/examples/Whitelist/Whitelist.sol
+++ b/contracts/core/contracts/examples/Whitelist/Whitelist.sol
@@ -21,7 +21,7 @@ pragma experimental ABIEncoderV2;
 
 import "../../protocol/Exchange/interfaces/IExchange.sol";
 import "../../protocol/Exchange/libs/LibOrder.sol";
-import "../../utils/Ownable/Ownable.sol";
+import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
 
 
 contract Whitelist is
diff --git a/contracts/core/contracts/extensions/DutchAuction/DutchAuction.sol b/contracts/core/contracts/extensions/DutchAuction/DutchAuction.sol
index abe8309cf..dfd4c46dc 100644
--- a/contracts/core/contracts/extensions/DutchAuction/DutchAuction.sol
+++ b/contracts/core/contracts/extensions/DutchAuction/DutchAuction.sol
@@ -22,8 +22,8 @@ pragma experimental ABIEncoderV2;
 import "../../protocol/Exchange/interfaces/IExchange.sol";
 import "../../protocol/Exchange/libs/LibOrder.sol";
 import "../../tokens/ERC20Token/IERC20Token.sol";
-import "../../utils/LibBytes/LibBytes.sol";
-import "../../utils/SafeMath/SafeMath.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/SafeMath/SafeMath.sol";
 
 
 contract DutchAuction is
diff --git a/contracts/core/contracts/extensions/Forwarder/MixinAssets.sol b/contracts/core/contracts/extensions/Forwarder/MixinAssets.sol
index 43efb5ff3..5f5f3456d 100644
--- a/contracts/core/contracts/extensions/Forwarder/MixinAssets.sol
+++ b/contracts/core/contracts/extensions/Forwarder/MixinAssets.sol
@@ -18,8 +18,8 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/LibBytes/LibBytes.sol";
-import "../../utils/Ownable/Ownable.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
 import "../../tokens/ERC20Token/IERC20Token.sol";
 import "../../tokens/ERC721Token/IERC721Token.sol";
 import "./libs/LibConstants.sol";
diff --git a/contracts/core/contracts/extensions/Forwarder/MixinForwarderCore.sol b/contracts/core/contracts/extensions/Forwarder/MixinForwarderCore.sol
index 54487f726..a5dd99225 100644
--- a/contracts/core/contracts/extensions/Forwarder/MixinForwarderCore.sol
+++ b/contracts/core/contracts/extensions/Forwarder/MixinForwarderCore.sol
@@ -24,7 +24,7 @@ import "./mixins/MWeth.sol";
 import "./mixins/MAssets.sol";
 import "./mixins/MExchangeWrapper.sol";
 import "./interfaces/IForwarderCore.sol";
-import "../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 import "../../protocol/Exchange/libs/LibOrder.sol";
 import "../../protocol/Exchange/libs/LibFillResults.sol";
 import "../../protocol/Exchange/libs/LibMath.sol";
diff --git a/contracts/core/contracts/extensions/Forwarder/libs/LibConstants.sol b/contracts/core/contracts/extensions/Forwarder/libs/LibConstants.sol
index 704e42ce3..0f98ae595 100644
--- a/contracts/core/contracts/extensions/Forwarder/libs/LibConstants.sol
+++ b/contracts/core/contracts/extensions/Forwarder/libs/LibConstants.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 import "../../../protocol/Exchange/interfaces/IExchange.sol";
 import "../../../tokens/EtherToken/IEtherToken.sol";
 import "../../../tokens/ERC20Token/IERC20Token.sol";
diff --git a/contracts/core/contracts/extensions/OrderValidator/OrderValidator.sol b/contracts/core/contracts/extensions/OrderValidator/OrderValidator.sol
index 3385d35ef..e3f4f6832 100644
--- a/contracts/core/contracts/extensions/OrderValidator/OrderValidator.sol
+++ b/contracts/core/contracts/extensions/OrderValidator/OrderValidator.sol
@@ -23,7 +23,7 @@ import "../../protocol/Exchange/interfaces/IExchange.sol";
 import "../../protocol/Exchange/libs/LibOrder.sol";
 import "../../tokens/ERC20Token/IERC20Token.sol";
 import "../../tokens/ERC721Token/IERC721Token.sol";
-import "../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 
 
 contract OrderValidator {
diff --git a/contracts/core/contracts/protocol/AssetProxy/MixinAuthorizable.sol b/contracts/core/contracts/protocol/AssetProxy/MixinAuthorizable.sol
index fe9bbf848..08f9b94dc 100644
--- a/contracts/core/contracts/protocol/AssetProxy/MixinAuthorizable.sol
+++ b/contracts/core/contracts/protocol/AssetProxy/MixinAuthorizable.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/Ownable/Ownable.sol";
+import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
 import "./mixins/MAuthorizable.sol";
 
 
diff --git a/contracts/core/contracts/protocol/AssetProxy/interfaces/IAuthorizable.sol b/contracts/core/contracts/protocol/AssetProxy/interfaces/IAuthorizable.sol
index ba1d4aa77..96ee05dee 100644
--- a/contracts/core/contracts/protocol/AssetProxy/interfaces/IAuthorizable.sol
+++ b/contracts/core/contracts/protocol/AssetProxy/interfaces/IAuthorizable.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../../utils/Ownable/IOwnable.sol";
+import "@0x/contracts-utils/contracts/utils/Ownable/IOwnable.sol";
 
 
 contract IAuthorizable is
diff --git a/contracts/core/contracts/protocol/AssetProxyOwner/AssetProxyOwner.sol b/contracts/core/contracts/protocol/AssetProxyOwner/AssetProxyOwner.sol
index 3096340b9..bfc7b5a66 100644
--- a/contracts/core/contracts/protocol/AssetProxyOwner/AssetProxyOwner.sol
+++ b/contracts/core/contracts/protocol/AssetProxyOwner/AssetProxyOwner.sol
@@ -19,7 +19,7 @@
 pragma solidity 0.4.24;
 
 import "@0x/contracts-multisig/contracts/multisig/MultiSigWalletWithTimeLock.sol";
-import "../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 
 
 contract AssetProxyOwner is
diff --git a/contracts/core/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol b/contracts/core/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol
index 87b09b6b3..02aeb4a13 100644
--- a/contracts/core/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol
+++ b/contracts/core/contracts/protocol/Exchange/MixinAssetProxyDispatcher.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/Ownable/Ownable.sol";
+import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
 import "./mixins/MAssetProxyDispatcher.sol";
 import "../AssetProxy/interfaces/IAssetProxy.sol";
 
diff --git a/contracts/core/contracts/protocol/Exchange/MixinExchangeCore.sol b/contracts/core/contracts/protocol/Exchange/MixinExchangeCore.sol
index 736dcd0b1..da721f78f 100644
--- a/contracts/core/contracts/protocol/Exchange/MixinExchangeCore.sol
+++ b/contracts/core/contracts/protocol/Exchange/MixinExchangeCore.sol
@@ -19,7 +19,7 @@
 pragma solidity 0.4.24;
 pragma experimental ABIEncoderV2;
 
-import "../../utils/ReentrancyGuard/ReentrancyGuard.sol";
+import "@0x/contracts-utils/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol";
 import "./libs/LibConstants.sol";
 import "./libs/LibFillResults.sol";
 import "./libs/LibOrder.sol";
diff --git a/contracts/core/contracts/protocol/Exchange/MixinMatchOrders.sol b/contracts/core/contracts/protocol/Exchange/MixinMatchOrders.sol
index b4f6bdb26..da1e9d270 100644
--- a/contracts/core/contracts/protocol/Exchange/MixinMatchOrders.sol
+++ b/contracts/core/contracts/protocol/Exchange/MixinMatchOrders.sol
@@ -14,7 +14,7 @@
 pragma solidity 0.4.24;
 pragma experimental ABIEncoderV2;
 
-import "../../utils/ReentrancyGuard/ReentrancyGuard.sol";
+import "@0x/contracts-utils/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol";
 import "./libs/LibConstants.sol";
 import "./libs/LibMath.sol";
 import "./libs/LibOrder.sol";
diff --git a/contracts/core/contracts/protocol/Exchange/MixinSignatureValidator.sol b/contracts/core/contracts/protocol/Exchange/MixinSignatureValidator.sol
index 033f8e901..711535aa8 100644
--- a/contracts/core/contracts/protocol/Exchange/MixinSignatureValidator.sol
+++ b/contracts/core/contracts/protocol/Exchange/MixinSignatureValidator.sol
@@ -18,8 +18,8 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/LibBytes/LibBytes.sol";
-import "../../utils/ReentrancyGuard/ReentrancyGuard.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol";
 import "./mixins/MSignatureValidator.sol";
 import "./mixins/MTransactions.sol";
 import "./interfaces/IWallet.sol";
diff --git a/contracts/core/contracts/protocol/Exchange/MixinWrapperFunctions.sol b/contracts/core/contracts/protocol/Exchange/MixinWrapperFunctions.sol
index cddff0e5f..415246358 100644
--- a/contracts/core/contracts/protocol/Exchange/MixinWrapperFunctions.sol
+++ b/contracts/core/contracts/protocol/Exchange/MixinWrapperFunctions.sol
@@ -19,7 +19,7 @@
 pragma solidity 0.4.24;
 pragma experimental ABIEncoderV2;
 
-import "../../utils/ReentrancyGuard/ReentrancyGuard.sol";
+import "@0x/contracts-utils/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol";
 import "./libs/LibMath.sol";
 import "./libs/LibOrder.sol";
 import "./libs/LibFillResults.sol";
diff --git a/contracts/core/contracts/protocol/Exchange/libs/LibFillResults.sol b/contracts/core/contracts/protocol/Exchange/libs/LibFillResults.sol
index 659ae9a69..fbd9950bf 100644
--- a/contracts/core/contracts/protocol/Exchange/libs/LibFillResults.sol
+++ b/contracts/core/contracts/protocol/Exchange/libs/LibFillResults.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../../utils/SafeMath/SafeMath.sol";
+import "@0x/contracts-utils/contracts/utils/SafeMath/SafeMath.sol";
 
 
 contract LibFillResults is
diff --git a/contracts/core/contracts/protocol/Exchange/libs/LibMath.sol b/contracts/core/contracts/protocol/Exchange/libs/LibMath.sol
index c0b85ea10..b24876a9c 100644
--- a/contracts/core/contracts/protocol/Exchange/libs/LibMath.sol
+++ b/contracts/core/contracts/protocol/Exchange/libs/LibMath.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../../utils/SafeMath/SafeMath.sol";
+import "@0x/contracts-utils/contracts/utils/SafeMath/SafeMath.sol";
 
 
 contract LibMath is
diff --git a/contracts/core/contracts/test/DummyERC20Token/DummyERC20Token.sol b/contracts/core/contracts/test/DummyERC20Token/DummyERC20Token.sol
index 412c5d1ad..33028db0c 100644
--- a/contracts/core/contracts/test/DummyERC20Token/DummyERC20Token.sol
+++ b/contracts/core/contracts/test/DummyERC20Token/DummyERC20Token.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/Ownable/Ownable.sol";
+import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
 import "../../tokens/ERC20Token/MintableERC20Token.sol";
 
 
diff --git a/contracts/core/contracts/test/DummyERC721Token/DummyERC721Token.sol b/contracts/core/contracts/test/DummyERC721Token/DummyERC721Token.sol
index ac9068d1d..4c978b2df 100644
--- a/contracts/core/contracts/test/DummyERC721Token/DummyERC721Token.sol
+++ b/contracts/core/contracts/test/DummyERC721Token/DummyERC721Token.sol
@@ -19,7 +19,7 @@
 pragma solidity 0.4.24;
 
 import "../../tokens/ERC721Token/MintableERC721Token.sol";
-import "../../utils/Ownable/Ownable.sol";
+import "@0x/contracts-utils/contracts/utils/Ownable/Ownable.sol";
 
 
 // solhint-disable no-empty-blocks
diff --git a/contracts/core/contracts/test/ReentrantERC20Token/ReentrantERC20Token.sol b/contracts/core/contracts/test/ReentrantERC20Token/ReentrantERC20Token.sol
index aa3bf9ab8..3e9091931 100644
--- a/contracts/core/contracts/test/ReentrantERC20Token/ReentrantERC20Token.sol
+++ b/contracts/core/contracts/test/ReentrantERC20Token/ReentrantERC20Token.sol
@@ -19,7 +19,7 @@
 pragma solidity 0.4.24;
 pragma experimental ABIEncoderV2;
 
-import "../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 import "../../tokens/ERC20Token/ERC20Token.sol";
 import "../../protocol/Exchange/interfaces/IExchange.sol";
 import "../../protocol/Exchange/libs/LibOrder.sol";
diff --git a/contracts/core/contracts/tokens/ERC20Token/MintableERC20Token.sol b/contracts/core/contracts/tokens/ERC20Token/MintableERC20Token.sol
index 9dc924422..58bccb5a1 100644
--- a/contracts/core/contracts/tokens/ERC20Token/MintableERC20Token.sol
+++ b/contracts/core/contracts/tokens/ERC20Token/MintableERC20Token.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/SafeMath/SafeMath.sol";
+import "@0x/contracts-utils/contracts/utils/SafeMath/SafeMath.sol";
 import "./UnlimitedAllowanceERC20Token.sol";
 
 
diff --git a/contracts/core/contracts/tokens/ERC721Token/ERC721Token.sol b/contracts/core/contracts/tokens/ERC721Token/ERC721Token.sol
index 530f080c0..600cee1ab 100644
--- a/contracts/core/contracts/tokens/ERC721Token/ERC721Token.sol
+++ b/contracts/core/contracts/tokens/ERC721Token/ERC721Token.sol
@@ -20,7 +20,7 @@ pragma solidity 0.4.24;
 
 import "./IERC721Token.sol";
 import "./IERC721Receiver.sol";
-import "../../utils/SafeMath/SafeMath.sol";
+import "@0x/contracts-utils/contracts/utils/SafeMath/SafeMath.sol";
 
 
 contract ERC721Token is
diff --git a/contracts/core/package.json b/contracts/core/package.json
index b50fc7a17..701e1866e 100644
--- a/contracts/core/package.json
+++ b/contracts/core/package.json
@@ -75,6 +75,7 @@
         "@0x/base-contract": "^3.0.8",
         "@0x/order-utils": "^3.0.4",
         "@0x/contracts-multisig": "^1.0.0",
+        "@0x/contracts-utils": "^1.0.0",
         "@0x/types": "^1.3.0",
         "@0x/typescript-typings": "^3.0.4",
         "@0x/utils": "^2.0.6",
diff --git a/contracts/core/src/artifacts/index.ts b/contracts/core/src/artifacts/index.ts
index f217adb8e..b925ec87f 100644
--- a/contracts/core/src/artifacts/index.ts
+++ b/contracts/core/src/artifacts/index.ts
@@ -25,9 +25,7 @@ import * as OrderValidator from '../../generated-artifacts/OrderValidator.json';
 import * as ReentrantERC20Token from '../../generated-artifacts/ReentrantERC20Token.json';
 import * as TestAssetProxyDispatcher from '../../generated-artifacts/TestAssetProxyDispatcher.json';
 import * as TestAssetProxyOwner from '../../generated-artifacts/TestAssetProxyOwner.json';
-import * as TestConstants from '../../generated-artifacts/TestConstants.json';
 import * as TestExchangeInternals from '../../generated-artifacts/TestExchangeInternals.json';
-import * as TestLibBytes from '../../generated-artifacts/TestLibBytes.json';
 import * as TestLibs from '../../generated-artifacts/TestLibs.json';
 import * as TestSignatureValidator from '../../generated-artifacts/TestSignatureValidator.json';
 import * as TestStaticCallReceiver from '../../generated-artifacts/TestStaticCallReceiver.json';
@@ -63,9 +61,7 @@ export const artifacts = {
     ReentrantERC20Token: ReentrantERC20Token as ContractArtifact,
     TestAssetProxyDispatcher: TestAssetProxyDispatcher as ContractArtifact,
     TestAssetProxyOwner: TestAssetProxyOwner as ContractArtifact,
-    TestConstants: TestConstants as ContractArtifact,
     TestExchangeInternals: TestExchangeInternals as ContractArtifact,
-    TestLibBytes: TestLibBytes as ContractArtifact,
     TestLibs: TestLibs as ContractArtifact,
     TestSignatureValidator: TestSignatureValidator as ContractArtifact,
     TestStaticCallReceiver: TestStaticCallReceiver as ContractArtifact,
diff --git a/contracts/core/src/wrappers/index.ts b/contracts/core/src/wrappers/index.ts
index 06a139209..0a64a4db0 100644
--- a/contracts/core/src/wrappers/index.ts
+++ b/contracts/core/src/wrappers/index.ts
@@ -20,9 +20,7 @@ export * from '../../generated-wrappers/order_validator';
 export * from '../../generated-wrappers/reentrant_erc20_token';
 export * from '../../generated-wrappers/test_asset_proxy_dispatcher';
 export * from '../../generated-wrappers/test_asset_proxy_owner';
-export * from '../../generated-wrappers/test_constants';
 export * from '../../generated-wrappers/test_exchange_internals';
-export * from '../../generated-wrappers/test_lib_bytes';
 export * from '../../generated-wrappers/test_libs';
 export * from '../../generated-wrappers/test_signature_validator';
 export * from '../../generated-wrappers/test_static_call_receiver';
diff --git a/contracts/core/test/exchange/libs.ts b/contracts/core/test/exchange/libs.ts
index f52992c13..44ff6a844 100644
--- a/contracts/core/test/exchange/libs.ts
+++ b/contracts/core/test/exchange/libs.ts
@@ -13,7 +13,6 @@ import { SignedOrder } from '@0x/types';
 import { BigNumber } from '@0x/utils';
 import * as chai from 'chai';
 
-import { TestConstantsContract } from '../../generated-wrappers/test_constants';
 import { TestLibsContract } from '../../generated-wrappers/test_libs';
 import { artifacts } from '../../src/artifacts';
 
@@ -26,7 +25,6 @@ describe('Exchange libs', () => {
     let signedOrder: SignedOrder;
     let orderFactory: OrderFactory;
     let libs: TestLibsContract;
-    let testConstants: TestConstantsContract;
 
     before(async () => {
         await blockchainLifecycle.startAsync();
@@ -38,11 +36,6 @@ describe('Exchange libs', () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const makerAddress = accounts[0];
         libs = await TestLibsContract.deployFrom0xArtifactAsync(artifacts.TestLibs, provider, txDefaults);
-        testConstants = await TestConstantsContract.deployFrom0xArtifactAsync(
-            artifacts.TestConstants,
-            provider,
-            txDefaults,
-        );
 
         const defaultOrderParams = {
             ...constants.STATIC_ORDER_PARAMS,
@@ -62,15 +55,6 @@ describe('Exchange libs', () => {
     afterEach(async () => {
         await blockchainLifecycle.revertAsync();
     });
-
-    describe('LibConstants', () => {
-        describe('ZRX_ASSET_DATA', () => {
-            it('should have the correct ZRX_ASSET_DATA', async () => {
-                const isValid = await testConstants.assertValidZrxAssetData.callAsync();
-                expect(isValid).to.be.equal(true);
-            });
-        });
-    });
     // Note(albrow): These tests are designed to be supplemental to the
     // combinatorial tests in test/exchange/internal. They test specific edge
     // cases that are not covered by the combinatorial tests.
diff --git a/contracts/core/tsconfig.json b/contracts/core/tsconfig.json
index 57ab35732..82d37b51e 100644
--- a/contracts/core/tsconfig.json
+++ b/contracts/core/tsconfig.json
@@ -32,9 +32,7 @@
         "./generated-artifacts/ReentrantERC20Token.json",
         "./generated-artifacts/TestAssetProxyDispatcher.json",
         "./generated-artifacts/TestAssetProxyOwner.json",
-        "./generated-artifacts/TestConstants.json",
         "./generated-artifacts/TestExchangeInternals.json",
-        "./generated-artifacts/TestLibBytes.json",
         "./generated-artifacts/TestLibs.json",
         "./generated-artifacts/TestSignatureValidator.json",
         "./generated-artifacts/TestStaticCallReceiver.json",
diff --git a/contracts/utils/.solhint.json b/contracts/utils/.solhint.json
new file mode 100644
index 000000000..076afe9f3
--- /dev/null
+++ b/contracts/utils/.solhint.json
@@ -0,0 +1,20 @@
+{
+    "extends": "default",
+    "rules": {
+        "avoid-low-level-calls": false,
+        "avoid-tx-origin": "warn",
+        "bracket-align": false,
+        "code-complexity": false,
+        "const-name-snakecase": "error",
+        "expression-indent": "error",
+        "function-max-lines": false,
+        "func-order": "error",
+        "indent": ["error", 4],
+        "max-line-length": ["warn", 160],
+        "no-inline-assembly": false,
+        "quotes": ["error", "double"],
+        "separate-by-one-line-in-contract": "error",
+        "space-after-comma": "error",
+        "statement-indent": "error"
+    }
+}
diff --git a/contracts/utils/README.md b/contracts/utils/README.md
new file mode 100644
index 000000000..e7c7b49ff
--- /dev/null
+++ b/contracts/utils/README.md
@@ -0,0 +1,70 @@
+## Contracts utils
+
+Smart contracts utils used in the 0x protocol.
+
+## Usage
+
+Contracts can be found in the [contracts](./contracts) directory. The contents of this directory are broken down into the following subdirectories:
+
+*   [utils](./contracts/utils)
+    *   This directory contains libraries and utils.
+*   [test](./contracts/test)
+    *   This directory contains mocks and other contracts that are used solely for testing contracts within the other directories.
+
+## Contributing
+
+We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+For proposals regarding the 0x protocol's smart contract architecture, message format, or additional functionality, go to the [0x Improvement Proposals (ZEIPs)](https://github.com/0xProject/ZEIPs) repository and follow the contribution guidelines provided therein.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Build
+
+To build this package and all other monorepo packages that it depends on, run the following from the monorepo root directory:
+
+```bash
+PKG=@0x/contracts-utils yarn build
+```
+
+Or continuously rebuild on change:
+
+```bash
+PKG=@0x/contracts-utils yarn watch
+```
+
+### Clean
+
+```bash
+yarn clean
+```
+
+### Lint
+
+```bash
+yarn lint
+```
+
+### Run Tests
+
+```bash
+yarn test
+```
+
+#### Testing options
+
+Contracts testing options like coverage, profiling, revert traces or backing node choosing - are described [here](../TESTING.md).
diff --git a/contracts/utils/compiler.json b/contracts/utils/compiler.json
new file mode 100644
index 000000000..1524c1eaa
--- /dev/null
+++ b/contracts/utils/compiler.json
@@ -0,0 +1,22 @@
+{
+    "artifactsDir": "./generated-artifacts",
+    "contractsDir": "./contracts",
+    "compilerSettings": {
+        "optimizer": {
+            "enabled": true,
+            "runs": 1000000
+        },
+        "outputSelection": {
+            "*": {
+                "*": [
+                    "abi",
+                    "evm.bytecode.object",
+                    "evm.bytecode.sourceMap",
+                    "evm.deployedBytecode.object",
+                    "evm.deployedBytecode.sourceMap"
+                ]
+            }
+        }
+    },
+    "contracts": ["TestConstants", "TestLibBytes", "LibBytes", "Ownable", "IOwnable", "ReentrancyGuard", "SafeMath"]
+}
diff --git a/contracts/core/contracts/test/TestConstants/TestConstants.sol b/contracts/utils/contracts/test/TestConstants/TestConstants.sol
index 1275d007b..3c852173b 100644
--- a/contracts/core/contracts/test/TestConstants/TestConstants.sol
+++ b/contracts/utils/contracts/test/TestConstants/TestConstants.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 
 
 // solhint-disable max-line-length
diff --git a/contracts/core/contracts/test/TestLibBytes/TestLibBytes.sol b/contracts/utils/contracts/test/TestLibBytes/TestLibBytes.sol
index 00d861e61..444a3e717 100644
--- a/contracts/core/contracts/test/TestLibBytes/TestLibBytes.sol
+++ b/contracts/utils/contracts/test/TestLibBytes/TestLibBytes.sol
@@ -18,7 +18,7 @@
 
 pragma solidity 0.4.24;
 
-import "../../utils/LibBytes/LibBytes.sol";
+import "@0x/contracts-utils/contracts/utils/LibBytes/LibBytes.sol";
 
 
 contract TestLibBytes {
diff --git a/contracts/core/contracts/utils/LibBytes/LibBytes.sol b/contracts/utils/contracts/utils/LibBytes/LibBytes.sol
index 369f588ad..369f588ad 100644
--- a/contracts/core/contracts/utils/LibBytes/LibBytes.sol
+++ b/contracts/utils/contracts/utils/LibBytes/LibBytes.sol
diff --git a/contracts/core/contracts/utils/Ownable/IOwnable.sol b/contracts/utils/contracts/utils/Ownable/IOwnable.sol
index 5deb13497..5deb13497 100644
--- a/contracts/core/contracts/utils/Ownable/IOwnable.sol
+++ b/contracts/utils/contracts/utils/Ownable/IOwnable.sol
diff --git a/contracts/core/contracts/utils/Ownable/Ownable.sol b/contracts/utils/contracts/utils/Ownable/Ownable.sol
index 0c830be68..0c830be68 100644
--- a/contracts/core/contracts/utils/Ownable/Ownable.sol
+++ b/contracts/utils/contracts/utils/Ownable/Ownable.sol
diff --git a/contracts/core/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol b/contracts/utils/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol
index 9f98a7a16..9f98a7a16 100644
--- a/contracts/core/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol
+++ b/contracts/utils/contracts/utils/ReentrancyGuard/ReentrancyGuard.sol
diff --git a/contracts/core/contracts/utils/SafeMath/SafeMath.sol b/contracts/utils/contracts/utils/SafeMath/SafeMath.sol
index 2855edb9d..2855edb9d 100644
--- a/contracts/core/contracts/utils/SafeMath/SafeMath.sol
+++ b/contracts/utils/contracts/utils/SafeMath/SafeMath.sol
diff --git a/contracts/utils/package.json b/contracts/utils/package.json
new file mode 100644
index 000000000..94b3cb7c7
--- /dev/null
+++ b/contracts/utils/package.json
@@ -0,0 +1,89 @@
+{
+    "private": true,
+    "name": "@0x/contracts-utils",
+    "version": "1.0.0",
+    "engines": {
+        "node": ">=6.12"
+    },
+    "description": "Smart contract utils of 0x protocol",
+    "main": "lib/src/index.js",
+    "directories": {
+        "test": "test"
+    },
+    "scripts": {
+        "build": "yarn pre_build && tsc -b",
+        "build:ci": "yarn build",
+        "pre_build": "run-s compile generate_contract_wrappers",
+        "test": "yarn run_mocha",
+        "rebuild_and_test": "run-s build test",
+        "test:coverage": "SOLIDITY_COVERAGE=true run-s build run_mocha coverage:report:text coverage:report:lcov",
+        "test:profiler": "SOLIDITY_PROFILER=true run-s build run_mocha profiler:report:html",
+        "test:trace": "SOLIDITY_REVERT_TRACE=true run-s build run_mocha",
+        "run_mocha":
+            "mocha --require source-map-support/register --require make-promises-safe 'lib/test/**/*.js' --timeout 100000 --bail --exit",
+        "compile": "sol-compiler --contracts-dir contracts",
+        "clean": "shx rm -rf lib generated-artifacts generated-wrappers",
+        "generate_contract_wrappers": "abi-gen --abis  ${npm_package_config_abis} --template ../../node_modules/@0x/abi-gen-templates/contract.handlebars --partials '../../node_modules/@0x/abi-gen-templates/partials/**/*.handlebars' --output generated-wrappers --backend ethers",
+        "lint": "tslint --format stylish --project . --exclude ./generated-wrappers/**/* --exclude ./generated-artifacts/**/* --exclude **/lib/**/* && yarn lint-contracts",
+        "coverage:report:text": "istanbul report text",
+        "coverage:report:html": "istanbul report html && open coverage/index.html",
+        "profiler:report:html": "istanbul report html && open coverage/index.html",
+        "coverage:report:lcov": "istanbul report lcov",
+        "test:circleci": "yarn test",
+        "lint-contracts": "solhint contracts/**/**/**/**/*.sol"
+    },
+    "config": {
+        "abis": "generated-artifacts/@(IOwnable|Ownable|LibBytes|ReentrancyGuard|SafeMath|TestConstants|TestLibBytes).json"
+    },
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/0xProject/0x-monorepo.git"
+    },
+    "license": "Apache-2.0",
+    "bugs": {
+        "url": "https://github.com/0xProject/0x-monorepo/issues"
+    },
+    "homepage": "https://github.com/0xProject/0x-monorepo/contracts/core/README.md",
+    "devDependencies": {
+        "@0x/contracts-test-utils": "^1.0.0",
+        "@0x/abi-gen": "^1.0.17",
+        "@0x/dev-utils": "^1.0.19",
+        "@0x/sol-compiler": "^1.1.14",
+        "@0x/sol-cov": "^2.1.14",
+        "@0x/subproviders": "^2.1.6",
+        "@0x/tslint-config": "^1.0.10",
+        "@types/bn.js": "^4.11.0",
+        "@types/lodash": "4.14.104",
+        "@types/node": "*",
+        "@types/yargs": "^10.0.0",
+        "chai": "^4.0.1",
+        "chai-as-promised": "^7.1.0",
+        "chai-bignumber": "^2.0.1",
+        "dirty-chai": "^2.0.1",
+        "make-promises-safe": "^1.1.0",
+        "ethereumjs-abi": "0.6.5",
+        "mocha": "^4.1.0",
+        "npm-run-all": "^4.1.2",
+        "shx": "^0.2.2",
+        "solc": "^0.4.24",
+        "solhint": "^1.2.1",
+        "tslint": "5.11.0",
+        "typescript": "3.0.1",
+        "yargs": "^10.0.3"
+    },
+    "dependencies": {
+        "@0x/base-contract": "^3.0.8",
+        "@0x/order-utils": "^3.0.4",
+        "@0x/contracts-multisig": "^1.0.0",
+        "@0x/types": "^1.3.0",
+        "@0x/typescript-typings": "^3.0.4",
+        "@0x/utils": "^2.0.6",
+        "@0x/web3-wrapper": "^3.1.6",
+        "ethereum-types": "^1.1.2",
+        "ethereumjs-util": "^5.1.1",
+        "lodash": "^4.17.5"
+    },
+    "publishConfig": {
+        "access": "public"
+    }
+}
diff --git a/contracts/utils/src/artifacts/index.ts b/contracts/utils/src/artifacts/index.ts
new file mode 100644
index 000000000..a5c2b215c
--- /dev/null
+++ b/contracts/utils/src/artifacts/index.ts
@@ -0,0 +1,19 @@
+import { ContractArtifact } from 'ethereum-types';
+
+import * as IOwnable from '../../generated-artifacts/IOwnable.json';
+import * as LibBytes from '../../generated-artifacts/LibBytes.json';
+import * as Ownable from '../../generated-artifacts/Ownable.json';
+import * as ReentrancyGuard from '../../generated-artifacts/ReentrancyGuard.json';
+import * as SafeMath from '../../generated-artifacts/SafeMath.json';
+import * as TestConstants from '../../generated-artifacts/TestConstants.json';
+import * as TestLibBytes from '../../generated-artifacts/TestLibBytes.json';
+
+export const artifacts = {
+    TestConstants: TestConstants as ContractArtifact,
+    TestLibBytes: TestLibBytes as ContractArtifact,
+    IOwnable: IOwnable as ContractArtifact,
+    LibBytes: LibBytes as ContractArtifact,
+    Ownable: Ownable as ContractArtifact,
+    SafeMath: SafeMath as ContractArtifact,
+    ReentrancyGuard: ReentrancyGuard as ContractArtifact,
+};
diff --git a/contracts/utils/src/index.ts b/contracts/utils/src/index.ts
new file mode 100644
index 000000000..d55f08ea2
--- /dev/null
+++ b/contracts/utils/src/index.ts
@@ -0,0 +1,2 @@
+export * from './artifacts';
+export * from './wrappers';
diff --git a/contracts/utils/src/wrappers/index.ts b/contracts/utils/src/wrappers/index.ts
new file mode 100644
index 000000000..823b7fa4b
--- /dev/null
+++ b/contracts/utils/src/wrappers/index.ts
@@ -0,0 +1,2 @@
+export * from '../../generated-wrappers/test_constants';
+export * from '../../generated-wrappers/test_lib_bytes';
diff --git a/contracts/utils/test/global_hooks.ts b/contracts/utils/test/global_hooks.ts
new file mode 100644
index 000000000..f8ace376a
--- /dev/null
+++ b/contracts/utils/test/global_hooks.ts
@@ -0,0 +1,17 @@
+import { env, EnvVars } from '@0x/dev-utils';
+
+import { coverage, profiler, provider } from '@0x/contracts-test-utils';
+before('start web3 provider', () => {
+    provider.start();
+});
+after('generate coverage report', async () => {
+    if (env.parseBoolean(EnvVars.SolidityCoverage)) {
+        const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
+        await coverageSubprovider.writeCoverageAsync();
+    }
+    if (env.parseBoolean(EnvVars.SolidityProfiler)) {
+        const profilerSubprovider = profiler.getProfilerSubproviderSingleton();
+        await profilerSubprovider.writeProfilerOutputAsync();
+    }
+    provider.stop();
+});
diff --git a/contracts/core/test/libraries/lib_bytes.ts b/contracts/utils/test/lib_bytes.ts
index 9338e6e7f..985a98943 100644
--- a/contracts/core/test/libraries/lib_bytes.ts
+++ b/contracts/utils/test/lib_bytes.ts
@@ -16,8 +16,8 @@ import * as chai from 'chai';
 import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
 
-import { TestLibBytesContract } from '../../generated-wrappers/test_lib_bytes';
-import { artifacts } from '../../src/artifacts';
+import { TestLibBytesContract } from '../generated-wrappers/test_lib_bytes';
+import { artifacts } from '../src';
 
 chaiSetup.configure();
 const expect = chai.expect;
diff --git a/contracts/utils/test/libs.ts b/contracts/utils/test/libs.ts
new file mode 100644
index 000000000..81596b2e4
--- /dev/null
+++ b/contracts/utils/test/libs.ts
@@ -0,0 +1,34 @@
+import { chaiSetup, provider, txDefaults, web3Wrapper } from '@0x/contracts-test-utils';
+import { BlockchainLifecycle } from '@0x/dev-utils';
+import * as chai from 'chai';
+
+import { TestConstantsContract } from '../generated-wrappers/test_constants';
+import { artifacts } from '../src';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
+
+describe('Libs', () => {
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+
+    describe('LibConstants', () => {
+        describe('ZRX_ASSET_DATA', () => {
+            it('should have the correct ZRX_ASSET_DATA', async () => {
+                const testConstants = await TestConstantsContract.deployFrom0xArtifactAsync(
+                    artifacts.TestConstants,
+                    provider,
+                    txDefaults,
+                );
+                const isValid = await testConstants.assertValidZrxAssetData.callAsync();
+                expect(isValid).to.be.equal(true);
+            });
+        });
+    });
+});
diff --git a/contracts/utils/tsconfig.json b/contracts/utils/tsconfig.json
new file mode 100644
index 000000000..68251e6b0
--- /dev/null
+++ b/contracts/utils/tsconfig.json
@@ -0,0 +1,19 @@
+{
+    "extends": "../../tsconfig",
+    "compilerOptions": {
+        "outDir": "lib",
+        "rootDir": ".",
+        "resolveJsonModule": true
+    },
+    "include": ["./src/**/*", "./test/**/*", "./generated-wrappers/**/*"],
+    "files": [
+        "./generated-artifacts/TestConstants.json",
+        "./generated-artifacts/TestLibBytes.json",
+        "./generated-artifacts/IOwnable.json",
+        "./generated-artifacts/Ownable.json",
+        "./generated-artifacts/LibBytes.json",
+        "./generated-artifacts/SafeMath.json",
+        "./generated-artifacts/ReentrancyGuard.json"
+    ],
+    "exclude": ["./deploy/solc/solc_bin"]
+}
diff --git a/contracts/utils/tslint.json b/contracts/utils/tslint.json
new file mode 100644
index 000000000..1bb3ac2a2
--- /dev/null
+++ b/contracts/utils/tslint.json
@@ -0,0 +1,6 @@
+{
+    "extends": ["@0x/tslint-config"],
+    "rules": {
+        "custom-no-magic-numbers": false
+    }
+}