Merge pull request #253 from 0xProject/feature/web3-wrapper

Refactor web3Wrapper to a separate package

70 files changed, 399 insertions, 315 deletions

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9a39dd33c..fa3388ad5 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -19,7 +19,7 @@ jobs:
       - run: wget https://s3.amazonaws.com/testrpc-shapshots/${CONTRACTS_COMMIT_HASH}.zip
       - run: unzip ${CONTRACTS_COMMIT_HASH}.zip -d testrpc_snapshot
       - run: node ./node_modules/lerna/bin/lerna.js bootstrap
-      - run: yarn lerna:run bootstrap
+      - run: yarn lerna:run build
       - run:
           name: testrpc
           command: npm run testrpc -- --db testrpc_snapshot
diff --git a/package.json b/package.json
index 091ae1069..dcaf34eba 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,6 @@
         "lerna": "^2.5.1",
         "async-child-process": "^1.1.1",
         "semver-sort": "^0.0.4",
-        "publish-release": "0xproject/publish-release",
-        "es6-promisify": "^5.0.0"
+        "publish-release": "0xproject/publish-release"
     }
 }
diff --git a/packages/0x.js/package.json b/packages/0x.js/package.json
index 8f8376a75..4468bae09 100644
--- a/packages/0x.js/package.json
+++ b/packages/0x.js/package.json
@@ -46,8 +46,7 @@
   },
   "devDependencies": {
     "@0xproject/tslint-config": "^0.2.0",
-    "abi-gen": "^0.0.0",
-    "abi-gen-templates": "^0.0.0",
+    "@0xproject/types": "^0.0.1",
     "@types/bintrees": "^1.0.2",
     "@types/jsonschema": "^1.1.1",
     "@types/lodash": "^4.14.86",
@@ -55,6 +54,8 @@
     "@types/node": "^8.0.53",
     "@types/sinon": "^2.2.2",
     "@types/uuid": "^3.4.2",
+    "abi-gen": "^0.0.1",
+    "abi-gen-templates": "^0.0.1",
     "awesome-typescript-loader": "^3.1.3",
     "chai": "^4.0.1",
     "chai-as-promised": "^7.1.0",
@@ -88,6 +89,8 @@
   "dependencies": {
     "@0xproject/assert": "^0.0.6",
     "@0xproject/json-schemas": "^0.6.9",
+    "@0xproject/utils": "^0.0.1",
+    "@0xproject/web3-wrapper": "^0.0.1",
     "bignumber.js": "~4.1.0",
     "bintrees": "^1.0.2",
     "bn.js": "^4.11.8",
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index 0616b3078..935e4ac1a 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -1,4 +1,5 @@
 import {schemas, SchemaValidator} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
@@ -29,7 +30,6 @@ import {intervalUtils} from './utils/interval_utils';
 import {OrderStateUtils} from './utils/order_state_utils';
 import {signatureUtils} from './utils/signature_utils';
 import {utils} from './utils/utils';
-import {Web3Wrapper} from './web3_wrapper';
 
 // Customize our BigNumber instances
 bigNumberConfigs.configure();
@@ -179,24 +179,31 @@ export class ZeroEx {
         const defaults = {
             gasPrice: config.gasPrice,
         };
-        this._web3Wrapper = new Web3Wrapper(provider, config.networkId, defaults);
+        this._web3Wrapper = new Web3Wrapper(provider, defaults);
         this.proxy = new TokenTransferProxyWrapper(
             this._web3Wrapper,
+            config.networkId,
             config.tokenTransferProxyContractAddress,
         );
         this.token = new TokenWrapper(
             this._web3Wrapper,
+            config.networkId,
             this._abiDecoder,
             this.proxy,
         );
         this.exchange = new ExchangeWrapper(
             this._web3Wrapper,
+            config.networkId,
             this._abiDecoder,
             this.token,
             config.exchangeContractAddress,
         );
-        this.tokenRegistry = new TokenRegistryWrapper(this._web3Wrapper, config.tokenRegistryContractAddress);
-        this.etherToken = new EtherTokenWrapper(this._web3Wrapper, this.token, config.etherTokenContractAddress);
+        this.tokenRegistry = new TokenRegistryWrapper(
+            this._web3Wrapper, config.networkId, config.tokenRegistryContractAddress,
+        );
+        this.etherToken = new EtherTokenWrapper(
+            this._web3Wrapper, config.networkId, this.token, config.etherTokenContractAddress,
+        );
         this.orderStateWatcher = new OrderStateWatcher(
             this._web3Wrapper, this._abiDecoder, this.token, this.exchange, config.orderWatcherConfig,
         );
diff --git a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
index 5e5a38f8c..d56b8632d 100644
--- a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import {Block, BlockAndLogStreamer} from 'ethereumjs-blockstream';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
@@ -19,10 +20,19 @@ import {AbiDecoder} from '../utils/abi_decoder';
 import {constants} from '../utils/constants';
 import {filterUtils} from '../utils/filter_utils';
 import {intervalUtils} from '../utils/interval_utils';
-import {Web3Wrapper} from '../web3_wrapper';
+
+const CONTRACT_NAME_TO_NOT_FOUND_ERROR: {[contractName: string]: ZeroExError} = {
+    ZRX: ZeroExError.ZRXContractDoesNotExist,
+    EtherToken: ZeroExError.EtherTokenContractDoesNotExist,
+    Token: ZeroExError.TokenContractDoesNotExist,
+    TokenRegistry: ZeroExError.TokenRegistryContractDoesNotExist,
+    TokenTransferProxy: ZeroExError.TokenTransferProxyContractDoesNotExist,
+    Exchange: ZeroExError.ExchangeContractDoesNotExist,
+};
 
 export class ContractWrapper {
     protected _web3Wrapper: Web3Wrapper;
+    private _networkId: number;
     private _abiDecoder?: AbiDecoder;
     private _blockAndLogStreamer: BlockAndLogStreamer|undefined;
     private _blockAndLogStreamInterval: NodeJS.Timer;
@@ -30,8 +40,9 @@ export class ContractWrapper {
     private _filterCallbacks: {[filterToken: string]: EventCallback<ContractEventArgs>};
     private _onLogAddedSubscriptionToken: string|undefined;
     private _onLogRemovedSubscriptionToken: string|undefined;
-    constructor(web3Wrapper: Web3Wrapper, abiDecoder?: AbiDecoder) {
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, abiDecoder?: AbiDecoder) {
         this._web3Wrapper = web3Wrapper;
+        this._networkId = networkId;
         this._abiDecoder = abiDecoder;
         this._filters = {};
         this._filterCallbacks = {};
@@ -93,15 +104,27 @@ export class ContractWrapper {
     protected async _instantiateContractIfExistsAsync(
         artifact: Artifact, addressIfExists?: string,
     ): Promise<Web3.ContractInstance> {
-        const web3ContractInstance = await this._web3Wrapper.getContractInstanceFromArtifactAsync(
-            artifact, addressIfExists,
+        let contractAddress: string;
+        if (_.isUndefined(addressIfExists)) {
+            if (_.isUndefined(artifact.networks[this._networkId])) {
+                throw new Error(ZeroExError.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.contract_name]);
+        }
+        const contractInstance = this._web3Wrapper.getContractInstance(
+            artifact.abi, contractAddress,
         );
-        return web3ContractInstance;
+        return contractInstance;
     }
     protected _getContractAddress(artifact: Artifact, addressIfExists?: string): string {
         if (_.isUndefined(addressIfExists)) {
-            const networkId = this._web3Wrapper.getNetworkId();
-            const contractAddress = artifact.networks[networkId].address;
+            const contractAddress = artifact.networks[this._networkId].address;
             if (_.isUndefined(contractAddress)) {
                 throw new Error(ZeroExError.ExchangeContractDoesNotExist);
             }
diff --git a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
index 26025f6f9..896cfde3d 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -1,10 +1,10 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
 import {TransactionOpts, ZeroExError} from '../types';
 import {assert} from '../utils/assert';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {EtherTokenContract} from './generated/ether_token';
@@ -18,8 +18,9 @@ export class EtherTokenWrapper extends ContractWrapper {
     private _etherTokenContractIfExists?: EtherTokenContract;
     private _tokenWrapper: TokenWrapper;
     private _contractAddressIfExists?: string;
-    constructor(web3Wrapper: Web3Wrapper, tokenWrapper: TokenWrapper, contractAddressIfExists?: string) {
-        super(web3Wrapper);
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, tokenWrapper: TokenWrapper,
+                contractAddressIfExists?: string) {
+        super(web3Wrapper, networkId);
         this._tokenWrapper = tokenWrapper;
         this._contractAddressIfExists = contractAddressIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index aaf6256a3..1e9865395 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -1,4 +1,5 @@
 import {schemas} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
@@ -36,7 +37,6 @@ import {decorators} from '../utils/decorators';
 import {ExchangeTransferSimulator} from '../utils/exchange_transfer_simulator';
 import {OrderValidationUtils} from '../utils/order_validation_utils';
 import {utils} from '../utils/utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {ExchangeContract} from './generated/exchange';
@@ -84,9 +84,9 @@ export class ExchangeWrapper extends ContractWrapper {
         ];
         return [orderAddresses, orderValues];
     }
-    constructor(web3Wrapper: Web3Wrapper, abiDecoder: AbiDecoder,
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, abiDecoder: AbiDecoder,
                 tokenWrapper: TokenWrapper, contractAddressIfExists?: string) {
-        super(web3Wrapper, abiDecoder);
+        super(web3Wrapper, networkId, abiDecoder);
         this._tokenWrapper = tokenWrapper;
         this._orderValidationUtils = new OrderValidationUtils(tokenWrapper, this);
         this._contractAddressIfExists = contractAddressIfExists;
diff --git a/packages/0x.js/src/contract_wrappers/generated/ether_token.ts b/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
index eed5e4686..ce3f9f527 100644
--- a/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/exchange.ts b/packages/0x.js/src/contract_wrappers/generated/exchange.ts
index 8c25ca014..e06ed960c 100644
--- a/packages/0x.js/src/contract_wrappers/generated/exchange.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/exchange.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/token.ts b/packages/0x.js/src/contract_wrappers/generated/token.ts
index 30b06292f..83a4ead34 100644
--- a/packages/0x.js/src/contract_wrappers/generated/token.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/token.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/token_registry.ts b/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
index 6aacc4336..5d9ad9016 100644
--- a/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts b/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts
index 50f1c8f25..fd50a5894 100644
--- a/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
index 27ecb8bde..064b826d8 100644
--- a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
@@ -1,10 +1,10 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
 import {Token, TokenMetadata, ZeroExError} from '../types';
 import {assert} from '../utils/assert';
 import {constants} from '../utils/constants';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {TokenRegistryContract} from './generated/token_registry';
@@ -27,8 +27,8 @@ export class TokenRegistryWrapper extends ContractWrapper {
         };
         return token;
     }
-    constructor(web3Wrapper: Web3Wrapper, contractAddressIfExists?: string) {
-        super(web3Wrapper);
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, contractAddressIfExists?: string) {
+        super(web3Wrapper, networkId);
         this._contractAddressIfExists = contractAddressIfExists;
     }
     /**
diff --git a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
index edc702672..1a16e3540 100644
--- a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
@@ -1,8 +1,8 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
 import {ZeroExError} from '../types';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {TokenTransferProxyContract} from './generated/token_transfer_proxy';
@@ -13,8 +13,8 @@ import {TokenTransferProxyContract} from './generated/token_transfer_proxy';
 export class TokenTransferProxyWrapper extends ContractWrapper {
     private _tokenTransferProxyContractIfExists?: TokenTransferProxyContract;
     private _contractAddressIfExists?: string;
-    constructor(web3Wrapper: Web3Wrapper, contractAddressIfExists?: string) {
-        super(web3Wrapper);
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, contractAddressIfExists?: string) {
+        super(web3Wrapper, networkId);
         this._contractAddressIfExists = contractAddressIfExists;
     }
     /**
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index 630ab6e3b..684f291a5 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -1,4 +1,5 @@
 import {schemas} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 
@@ -17,7 +18,6 @@ import {
 import {AbiDecoder} from '../utils/abi_decoder';
 import {assert} from '../utils/assert';
 import {constants} from '../utils/constants';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {TokenContract} from './generated/token';
@@ -34,9 +34,9 @@ export class TokenWrapper extends ContractWrapper {
     public UNLIMITED_ALLOWANCE_IN_BASE_UNITS = constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
     private _tokenContractsByAddress: {[address: string]: TokenContract};
     private _tokenTransferProxyWrapper: TokenTransferProxyWrapper;
-    constructor(web3Wrapper: Web3Wrapper, abiDecoder: AbiDecoder,
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, abiDecoder: AbiDecoder,
                 tokenTransferProxyWrapper: TokenTransferProxyWrapper) {
-        super(web3Wrapper, abiDecoder);
+        super(web3Wrapper, networkId, abiDecoder);
         this._tokenContractsByAddress = {};
         this._tokenTransferProxyWrapper = tokenTransferProxyWrapper;
     }
diff --git a/packages/0x.js/src/order_watcher/event_watcher.ts b/packages/0x.js/src/order_watcher/event_watcher.ts
index 831f19da5..d5b30d567 100644
--- a/packages/0x.js/src/order_watcher/event_watcher.ts
+++ b/packages/0x.js/src/order_watcher/event_watcher.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
@@ -11,7 +12,6 @@ import {AbiDecoder} from '../utils/abi_decoder';
 import {assert} from '../utils/assert';
 import {intervalUtils} from '../utils/interval_utils';
 import {utils} from '../utils/utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 const DEFAULT_EVENT_POLLING_INTERVAL_MS = 200;
 
diff --git a/packages/0x.js/src/order_watcher/order_state_watcher.ts b/packages/0x.js/src/order_watcher/order_state_watcher.ts
index 1ce111708..08f52d6e1 100644
--- a/packages/0x.js/src/order_watcher/order_state_watcher.ts
+++ b/packages/0x.js/src/order_watcher/order_state_watcher.ts
@@ -1,4 +1,5 @@
 import {schemas} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import {ZeroEx} from '../0x';
@@ -31,7 +32,6 @@ import {assert} from '../utils/assert';
 import {intervalUtils} from '../utils/interval_utils';
 import {OrderStateUtils} from '../utils/order_state_utils';
 import {utils} from '../utils/utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {EventWatcher} from './event_watcher';
 import {ExpirationWatcher} from './expiration_watcher';
diff --git a/packages/0x.js/src/utils/assert.ts b/packages/0x.js/src/utils/assert.ts
index 3cff9d2cf..4cf6caf77 100644
--- a/packages/0x.js/src/utils/assert.ts
+++ b/packages/0x.js/src/utils/assert.ts
@@ -1,12 +1,12 @@
 import {assert as sharedAssert} from '@0xproject/assert';
 import {Schema, SchemaValidator} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
 import {ECSignature} from '../types';
 import {signatureUtils} from '../utils/signature_utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 const HEX_REGEX = /^0x[0-9A-F]*$/i;
 
diff --git a/packages/0x.js/test/event_watcher_test.ts b/packages/0x.js/test/event_watcher_test.ts
index f27a7da2c..3d92c62a3 100644
--- a/packages/0x.js/test/event_watcher_test.ts
+++ b/packages/0x.js/test/event_watcher_test.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
 import * as _ from 'lodash';
@@ -12,7 +13,6 @@ import {
 } from '../src';
 import {EventWatcher} from '../src/order_watcher/event_watcher';
 import {DoneCallback} from '../src/types';
-import {Web3Wrapper} from '../src/web3_wrapper';
 
 import {chaiSetup} from './utils/chai_setup';
 import {constants} from './utils/constants';
@@ -60,7 +60,7 @@ describe('EventWatcher', () => {
     before(async () => {
         web3 = web3Factory.create();
         const pollingIntervalMs = 10;
-        web3Wrapper = new Web3Wrapper(web3.currentProvider, constants.TESTRPC_NETWORK_ID);
+        web3Wrapper = new Web3Wrapper(web3.currentProvider);
         eventWatcher = new EventWatcher(web3Wrapper, pollingIntervalMs);
     });
     afterEach(() => {
diff --git a/packages/0x.js/test/expiration_watcher_test.ts b/packages/0x.js/test/expiration_watcher_test.ts
index c60b5dc6c..d4581259d 100644
--- a/packages/0x.js/test/expiration_watcher_test.ts
+++ b/packages/0x.js/test/expiration_watcher_test.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
 import * as _ from 'lodash';
@@ -10,7 +11,6 @@ import {ExpirationWatcher} from '../src/order_watcher/expiration_watcher';
 import {DoneCallback, Token} from '../src/types';
 import {constants} from '../src/utils/constants';
 import {utils} from '../src/utils/utils';
-import {Web3Wrapper} from '../src/web3_wrapper';
 
 import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
 import {chaiSetup} from './utils/chai_setup';
diff --git a/packages/0x.js/test/order_state_watcher_test.ts b/packages/0x.js/test/order_state_watcher_test.ts
index 1e5bc1a35..b5968dc24 100644
--- a/packages/0x.js/test/order_state_watcher_test.ts
+++ b/packages/0x.js/test/order_state_watcher_test.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
 import * as _ from 'lodash';
@@ -19,7 +20,6 @@ import {
 } from '../src';
 import {OrderStateWatcher} from '../src/order_watcher/order_state_watcher';
 import {DoneCallback} from '../src/types';
-import {Web3Wrapper} from '../src/web3_wrapper';
 
 import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
 import {chaiSetup} from './utils/chai_setup';
diff --git a/packages/0x.js/test/token_wrapper_test.ts b/packages/0x.js/test/token_wrapper_test.ts
index 421bd0a8c..ae6016869 100644
--- a/packages/0x.js/test/token_wrapper_test.ts
+++ b/packages/0x.js/test/token_wrapper_test.ts
@@ -1,3 +1,5 @@
+import {promisify} from '@0xproject/utils';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
 import 'mocha';
@@ -18,8 +20,6 @@ import {
     ZeroExError,
 } from '../src';
 import {BlockParamLiteral, DoneCallback} from '../src/types';
-import {promisify} from '../src/utils/promisify';
-import {Web3Wrapper} from '../src/web3_wrapper';
 
 import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
 import {chaiSetup} from './utils/chai_setup';
@@ -46,7 +46,7 @@ describe('TokenWrapper', () => {
     before(async () => {
         web3 = web3Factory.create();
         zeroEx = new ZeroEx(web3.currentProvider, config);
-        web3Wrapper = new Web3Wrapper(web3.currentProvider, config.networkId);
+        web3Wrapper = new Web3Wrapper(web3.currentProvider);
         userAddresses = await zeroEx.getAvailableAddressesAsync();
         tokens = await zeroEx.tokenRegistry.getTokensAsync();
         tokenUtils = new TokenUtils(tokens);
diff --git a/packages/abi-gen-templates/contract.mustache b/packages/abi-gen-templates/contract.mustache
index 27783fb6e..ec06df507 100644
--- a/packages/abi-gen-templates/contract.mustache
+++ b/packages/abi-gen-templates/contract.mustache
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/abi-gen-templates/package.json b/packages/abi-gen-templates/package.json
index 104013c05..e45da3bf1 100644
--- a/packages/abi-gen-templates/package.json
+++ b/packages/abi-gen-templates/package.json
@@ -1,7 +1,7 @@
 {
   "name": "abi-gen-templates",
   "private": true,
-  "version": "0.0.0",
+  "version": "0.0.1",
   "description": "Handlebars templates to generate TS contract wrappers",
   "repository": {
     "type": "git",
diff --git a/packages/abi-gen/package.json b/packages/abi-gen/package.json
index defe4a621..0d61891e0 100644
--- a/packages/abi-gen/package.json
+++ b/packages/abi-gen/package.json
@@ -1,6 +1,6 @@
 {
   "name": "abi-gen",
-  "version": "0.0.0",
+  "version": "0.0.1",
   "description": "Generate contract wrappers from ABI and handlebars templates",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
@@ -33,9 +33,9 @@
     "yargs": "^10.0.3"
   },
   "devDependencies": {
-    "@types/handlebars": "^4.0.36",
     "@0xproject/tslint-config": "^0.2.0",
     "@types/glob": "^5.0.33",
+    "@types/handlebars": "^4.0.36",
     "@types/mkdirp": "^0.5.1",
     "@types/node": "^8.0.53",
     "@types/yargs": "^8.0.2",
diff --git a/packages/abi-gen/tsconfig.json b/packages/abi-gen/tsconfig.json
index 2a3667890..695f2a47e 100644
--- a/packages/abi-gen/tsconfig.json
+++ b/packages/abi-gen/tsconfig.json
@@ -12,6 +12,6 @@
   "include": [
     "./src/**/*",
     "./test/**/*",
-    "../../node_modules/web3-typescript-typings/index.d.ts",
+    "../../node_modules/web3-typescript-typings/index.d.ts"
   ]
 }
diff --git a/packages/contracts/deploy/cli.ts b/packages/contracts/deploy/cli.ts
index 73a43b247..423523e21 100644
--- a/packages/contracts/deploy/cli.ts
+++ b/packages/contracts/deploy/cli.ts
@@ -1,9 +1,11 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
+import {BigNumber} from 'bignumber.js';
 import * as _ from 'lodash';
 import * as path from 'path';
+import * as Web3 from 'web3';
 import * as yargs from 'yargs';
 
 import {commands} from './src/commands';
-import {network} from './src/utils/network';
 import {
     CliOptions,
     CompilerOptions,
@@ -36,23 +38,26 @@ async function onCompileCommand(args: CliOptions): Promise<void> {
  * @param argv Instance of process.argv provided by yargs.
  */
 async function onMigrateCommand(argv: CliOptions): Promise<void> {
-    const networkIdIfExists = await network.getNetworkIdIfExistsAsync(argv.jsonrpcPort);
+    const url = `http://localhost:${argv.jsonrpcPort}`;
+    const web3Provider = new Web3.providers.HttpProvider(url);
+    const web3Wrapper = new Web3Wrapper(web3Provider);
+    const networkId = await web3Wrapper.getNetworkIdAsync();
     const compilerOpts: CompilerOptions = {
         contractsDir: argv.contractsDir,
-        networkId: networkIdIfExists,
+        networkId,
         optimizerEnabled: argv.shouldOptimize ? 1 : 0,
         artifactsDir: argv.artifactsDir,
     };
     await commands.compileAsync(compilerOpts);
 
     const defaults = {
-        gasPrice: argv.gasPrice,
+        gasPrice: new BigNumber(argv.gasPrice),
         from: argv.account,
     };
-    const deployerOpts: DeployerOptions = {
+    const deployerOpts = {
         artifactsDir: argv.artifactsDir,
         jsonrpcPort: argv.jsonrpcPort,
-        networkId: networkIdIfExists,
+        networkId,
         defaults,
     };
     await commands.migrateAsync(deployerOpts);
@@ -62,23 +67,26 @@ async function onMigrateCommand(argv: CliOptions): Promise<void> {
  * @param argv Instance of process.argv provided by yargs.
  */
 async function onDeployCommand(argv: CliOptions): Promise<void> {
-    const networkIdIfExists = await network.getNetworkIdIfExistsAsync(argv.jsonrpcPort);
+    const url = `http://localhost:${argv.jsonrpcPort}`;
+    const web3Provider = new Web3.providers.HttpProvider(url);
+    const web3Wrapper = new Web3Wrapper(web3Provider);
+    const networkId = await web3Wrapper.getNetworkIdAsync();
     const compilerOpts: CompilerOptions = {
         contractsDir: argv.contractsDir,
-        networkId: networkIdIfExists,
+        networkId,
         optimizerEnabled: argv.shouldOptimize ? 1 : 0,
         artifactsDir: argv.artifactsDir,
     };
     await commands.compileAsync(compilerOpts);
 
     const defaults = {
-        gasPrice: argv.gasPrice,
+        gasPrice: new BigNumber(argv.gasPrice),
         from: argv.account,
     };
     const deployerOpts: DeployerOptions = {
         artifactsDir: argv.artifactsDir,
         jsonrpcPort: argv.jsonrpcPort,
-        networkId: networkIdIfExists,
+        networkId,
         defaults,
     };
     const deployerArgsString = argv.args;
diff --git a/packages/contracts/deploy/migrations/migrate.ts b/packages/contracts/deploy/migrations/migrate.ts
index ea91febe4..c3d38875e 100644
--- a/packages/contracts/deploy/migrations/migrate.ts
+++ b/packages/contracts/deploy/migrations/migrate.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import {BigNumber} from 'bignumber.js';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
@@ -5,7 +6,6 @@ import * as Web3 from 'web3';
 import {Deployer} from './../src/deployer';
 import {constants} from './../src/utils/constants';
 import {Token} from './../src/utils/types';
-import {Web3Wrapper} from './../src/utils/web3_wrapper';
 import {tokenInfo} from './config/token_info';
 
 export const migrator = {
diff --git a/packages/contracts/deploy/src/compiler.ts b/packages/contracts/deploy/src/compiler.ts
index 70b88b514..8a44e94a3 100644
--- a/packages/contracts/deploy/src/compiler.ts
+++ b/packages/contracts/deploy/src/compiler.ts
@@ -1,4 +1,4 @@
-import promisify = require('es6-promisify');
+import {promisify} from '@0xproject/utils';
 import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
 import * as path from 'path';
diff --git a/packages/contracts/deploy/src/deployer.ts b/packages/contracts/deploy/src/deployer.ts
index 48d175a42..4c8018ecc 100644
--- a/packages/contracts/deploy/src/deployer.ts
+++ b/packages/contracts/deploy/src/deployer.ts
@@ -1,4 +1,6 @@
-import promisify = require('es6-promisify');
+import {TxData} from '@0xproject/types';
+import {promisify} from '@0xproject/utils';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
@@ -11,7 +13,6 @@ import {
     DeployerOptions,
 } from './utils/types';
 import {utils} from './utils/utils';
-import {Web3Wrapper} from './utils/web3_wrapper';
 
 // Gas added to gas estimate to make sure there is sufficient gas for deployment.
 const EXTRA_GAS = 200000;
@@ -21,7 +22,7 @@ export class Deployer {
     private artifactsDir: string;
     private jsonrpcPort: number;
     private networkId: number;
-    private defaults: Partial<Web3.TxData>;
+    private defaults: Partial<TxData>;
 
     constructor(opts: DeployerOptions) {
         this.artifactsDir = opts.artifactsDir;
@@ -171,7 +172,7 @@ export class Deployer {
         const block = await this.web3Wrapper.getBlockAsync('latest');
         let gas: number;
         try {
-            const gasEstimate: number = await this.web3Wrapper.estimateGasAsync({data});
+            const gasEstimate: number = await this.web3Wrapper.estimateGasAsync(data);
             gas = Math.min(gasEstimate + EXTRA_GAS, block.gasLimit);
         } catch (err) {
             gas = block.gasLimit;
diff --git a/packages/contracts/deploy/src/utils/contract.ts b/packages/contracts/deploy/src/utils/contract.ts
index e9c49c9f1..7b6098cea 100644
--- a/packages/contracts/deploy/src/utils/contract.ts
+++ b/packages/contracts/deploy/src/utils/contract.ts
@@ -1,5 +1,5 @@
 import {schemas, SchemaValidator} from '@0xproject/json-schemas';
-import promisify = require('es6-promisify');
+import {promisify} from '@0xproject/utils';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
diff --git a/packages/contracts/deploy/src/utils/fs_wrapper.ts b/packages/contracts/deploy/src/utils/fs_wrapper.ts
index 6b4fd625c..90785d0dd 100644
--- a/packages/contracts/deploy/src/utils/fs_wrapper.ts
+++ b/packages/contracts/deploy/src/utils/fs_wrapper.ts
@@ -1,11 +1,11 @@
-import promisify = require('es6-promisify');
+import {promisify} from '@0xproject/utils';
 import * as fs from 'fs';
 
 export const fsWrapper = {
-    readdirAsync: promisify(fs.readdir),
-    readFileAsync: promisify(fs.readFile),
-    writeFileAsync: promisify(fs.writeFile),
-    mkdirAsync: promisify(fs.mkdir),
+    readdirAsync: promisify<string[]>(fs.readdir),
+    readFileAsync: promisify<string>(fs.readFile),
+    writeFileAsync: promisify<undefined>(fs.writeFile),
+    mkdirAsync: promisify<undefined>(fs.mkdir),
     doesPathExistSync: fs.existsSync,
-    removeFileAsync: promisify(fs.unlink),
+    removeFileAsync: promisify<undefined>(fs.unlink),
 };
diff --git a/packages/contracts/deploy/src/utils/network.ts b/packages/contracts/deploy/src/utils/network.ts
deleted file mode 100644
index 74123e6a5..000000000
--- a/packages/contracts/deploy/src/utils/network.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import promisify = require('es6-promisify');
-import * as Web3 from 'web3';
-
-import {Web3Wrapper} from './web3_wrapper';
-
-export const network = {
-    async getNetworkIdIfExistsAsync(port: number): Promise<number> {
-        const url = `http://localhost:${port}`;
-        const web3Provider = new Web3.providers.HttpProvider(url);
-        const defaults = {};
-        const web3Wrapper = new Web3Wrapper(web3Provider, defaults);
-        const networkIdIfExists = await web3Wrapper.getNetworkIdIfExistsAsync();
-        return networkIdIfExists;
-    },
-};
diff --git a/packages/contracts/deploy/src/utils/types.ts b/packages/contracts/deploy/src/utils/types.ts
index 855f1e849..f6b9de6e9 100644
--- a/packages/contracts/deploy/src/utils/types.ts
+++ b/packages/contracts/deploy/src/utils/types.ts
@@ -1,3 +1,4 @@
+import {TxData} from '@0xproject/types';
 import * as Web3 from 'web3';
 
 export enum AbiType {
@@ -54,7 +55,7 @@ export interface DeployerOptions {
     artifactsDir: string;
     jsonrpcPort: number;
     networkId: number;
-    defaults: Partial<Web3.TxData>;
+    defaults: Partial<TxData>;
 }
 
 export interface ContractSources {
diff --git a/packages/contracts/deploy/src/utils/web3_wrapper.ts b/packages/contracts/deploy/src/utils/web3_wrapper.ts
deleted file mode 100644
index 0209da26d..000000000
--- a/packages/contracts/deploy/src/utils/web3_wrapper.ts
+++ /dev/null
@@ -1,132 +0,0 @@
-import BigNumber from 'bignumber.js';
-import promisify = require('es6-promisify');
-import * as _ from 'lodash';
-import * as Web3 from 'web3';
-
-import {Contract} from './contract';
-import {ZeroExError} from './types';
-
-export class Web3Wrapper {
-    private web3: Web3;
-    private defaults: Partial<Web3.TxData>;
-    private networkIdIfExists?: number;
-    private jsonRpcRequestId: number;
-    constructor(provider: Web3.Provider, defaults: Partial<Web3.TxData>) {
-        this.web3 = new Web3();
-        this.web3.setProvider(provider);
-        this.defaults = defaults;
-        this.jsonRpcRequestId = 0;
-    }
-    public setProvider(provider: Web3.Provider) {
-        delete this.networkIdIfExists;
-        this.web3.setProvider(provider);
-    }
-    public isAddress(address: string): boolean {
-        return this.web3.isAddress(address);
-    }
-    public getContractFromAbi(abi: Web3.ContractAbi): Web3.Contract<Web3.ContractInstance> {
-        const contract = this.web3.eth.contract(abi);
-        return contract;
-    }
-    public async isSenderAddressAvailableAsync(senderAddress: string): Promise<boolean> {
-        const addresses = await this.getAvailableAddressesAsync();
-        return _.includes(addresses, senderAddress);
-    }
-    public async getNodeVersionAsync(): Promise<string> {
-        const nodeVersion = await promisify(this.web3.version.getNode)();
-        return nodeVersion;
-    }
-    public async getTransactionReceiptAsync(txHash: string): Promise<Web3.TransactionReceipt> {
-        const transactionReceipt = await promisify(this.web3.eth.getTransactionReceipt)(txHash);
-        return transactionReceipt;
-    }
-    public getCurrentProvider(): Web3.Provider {
-        return this.web3.currentProvider;
-    }
-    public async getNetworkIdIfExistsAsync(): Promise<number|undefined> {
-        if (!_.isUndefined(this.networkIdIfExists)) {
-          return this.networkIdIfExists;
-        }
-
-        try {
-            const networkId = await this.getNetworkAsync();
-            this.networkIdIfExists = Number(networkId);
-            return this.networkIdIfExists;
-        } catch (err) {
-            return undefined;
-        }
-    }
-    public toWei(ethAmount: BigNumber): BigNumber {
-        const balanceWei = this.web3.toWei(ethAmount, 'ether');
-        return balanceWei;
-    }
-    public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
-        let balanceInWei = await promisify(this.web3.eth.getBalance)(owner);
-        balanceInWei = new BigNumber(balanceInWei);
-        return balanceInWei;
-    }
-    public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
-        const code = await promisify(this.web3.eth.getCode)(address);
-        // Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
-        const codeIsEmpty = /^0x0{0,40}$/i.test(code);
-        return !codeIsEmpty;
-    }
-    public async signTransactionAsync(address: string, message: string): Promise<string> {
-        const signData = await promisify(this.web3.eth.sign)(address, message);
-        return signData;
-    }
-    public async getBlockAsync(blockParam: string|Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
-        const block = await promisify(this.web3.eth.getBlock)(blockParam);
-        return block;
-    }
-    public async getBlockTimestampAsync(blockParam: string|Web3.BlockParam): Promise<number> {
-        const {timestamp} = await this.getBlockAsync(blockParam);
-        return timestamp;
-    }
-    public async getAvailableAddressesAsync(): Promise<string[]> {
-        const addresses: string[] = await promisify(this.web3.eth.getAccounts)();
-        return addresses;
-    }
-    public async getLogsAsync(filter: Web3.FilterObject): Promise<Web3.LogEntry[]> {
-        let fromBlock = filter.fromBlock;
-        if (_.isNumber(fromBlock)) {
-            fromBlock = this.web3.toHex(fromBlock);
-        }
-        let toBlock = filter.toBlock;
-        if (_.isNumber(toBlock)) {
-            toBlock = this.web3.toHex(toBlock);
-        }
-        const serializedFilter = {
-            ...filter,
-            fromBlock,
-            toBlock,
-        };
-        const payload = {
-            jsonrpc: '2.0',
-            id: this.jsonRpcRequestId++,
-            method: 'eth_getLogs',
-            params: [serializedFilter],
-        };
-        const logs = await this.sendRawPayloadAsync(payload);
-        return logs;
-    }
-    public async estimateGasAsync(callData: Web3.CallData): Promise<number> {
-        const gasEstimate = await promisify(this.web3.eth.estimateGas)(callData);
-        return gasEstimate;
-    }
-    private getContractInstance<A extends Web3.ContractInstance>(abi: Web3.ContractAbi, address: string): A {
-        const web3ContractInstance = this.web3.eth.contract(abi).at(address);
-        const contractInstance = new Contract(web3ContractInstance, this.defaults) as any as A;
-        return contractInstance;
-    }
-    private async getNetworkAsync(): Promise<number> {
-        const networkId = await promisify(this.web3.version.getNetwork)();
-        return networkId;
-    }
-    private async sendRawPayloadAsync(payload: Web3.JSONRPCRequestPayload): Promise<any> {
-        const sendAsync = this.web3.currentProvider.sendAsync.bind(this.web3.currentProvider);
-        const response = await promisify(sendAsync)(payload);
-        const result = response.result;
-        return result;
-    }
-}
diff --git a/packages/contracts/deploy/test/deploy_test.ts b/packages/contracts/deploy/test/deploy_test.ts
index 28cbd4586..7e7b98f90 100644
--- a/packages/contracts/deploy/test/deploy_test.ts
+++ b/packages/contracts/deploy/test/deploy_test.ts
@@ -19,7 +19,7 @@ const compilerOpts: CompilerOptions = {
     optimizerEnabled: constants.optimizerEnabled,
 };
 const compiler = new Compiler(compilerOpts);
-const deployerOpts: DeployerOptions = {
+const deployerOpts = {
     artifactsDir,
     networkId: constants.networkId,
     jsonrpcPort: constants.jsonrpcPort,
diff --git a/packages/contracts/deploy/test/util/constants.ts b/packages/contracts/deploy/test/util/constants.ts
index 226c5a205..a2de44b63 100644
--- a/packages/contracts/deploy/test/util/constants.ts
+++ b/packages/contracts/deploy/test/util/constants.ts
@@ -1,8 +1,10 @@
+import {BigNumber} from 'bignumber.js';
+
 export const constants = {
     networkId: 0,
     jsonrpcPort: 8545,
     optimizerEnabled: 0,
-    gasPrice: '20000000000',
+    gasPrice: new BigNumber(20000000000),
     timeoutMs: 12000,
     zrxTokenAddress: '0xe41d2489571d322189246dafa5ebde1f4699f498',
     tokenTransferProxyAddress: '0x8da0d80f5007ef1e431dd2127178d224e32c2ef4',
diff --git a/packages/contracts/globals.d.ts b/packages/contracts/globals.d.ts
index 8bc5b5c3f..df53e9372 100644
--- a/packages/contracts/globals.d.ts
+++ b/packages/contracts/globals.d.ts
@@ -27,11 +27,6 @@ declare module 'solc' {
     export function setupMethods(solcBin: any): any;
 }
 
-declare module 'es6-promisify' {
-    function promisify(original: any, settings?: any): ((...arg: any[]) => Promise<any>);
-    export = promisify;
-}
-
 declare module 'web3-eth-abi' {
     export function encodeParameters(typesArray: string[], parameters: any[]): string;
 }
@@ -39,4 +34,3 @@ declare module 'web3-eth-abi' {
 // Truffle injects the following into the global scope
 declare var artifacts: any;
 declare var contract: any;
-
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index efa2d94c6..92a9da53e 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -13,7 +13,7 @@
     "clean": "rm -rf ./lib",
     "migrate:truffle": "npm run build; truffle migrate",
     "migrate": "npm run build; node lib/deploy/cli.js migrate",
-    "lint": "tslint --project . 'migrations/*.ts' 'test/**/*.ts' 'util/*.ts' 'deploy/**/*.ts'",
+    "lint": "tslint --project . 'migrations/**/*.ts' 'test/**/*.ts' 'util/**/*.ts' 'deploy/**/*.ts'",
     "test:deployer": "npm run build; mocha lib/deploy/test/*_test.js"
   },
   "repository": {
@@ -28,6 +28,7 @@
   "homepage": "https://github.com/0xProject/0x.js/packages/contracts/README.md",
   "devDependencies": {
     "@0xproject/tslint-config": "^0.2.0",
+    "@0xproject/types": "^0.0.1",
     "@types/bluebird": "^3.5.3",
     "@types/isomorphic-fetch": "^0.0.34",
     "@types/lodash": "^4.14.86",
@@ -53,11 +54,12 @@
   },
   "dependencies": {
     "0x.js": "^0.22.6",
+    "@0xproject/web3-wrapper": "^0.0.1",
     "@0xproject/json-schemas": "^0.6.9",
+    "@0xproject/utils": "^0.0.1",
     "bignumber.js": "~4.1.0",
     "bluebird": "^3.5.0",
     "bn.js": "^4.11.8",
-    "es6-promisify": "^5.0.0",
     "ethereumjs-abi": "^0.6.4",
     "ethereumjs-util": "^5.1.1",
     "isomorphic-fetch": "^2.2.1",
diff --git a/packages/contracts/test/ts/ether_token.ts b/packages/contracts/test/ts/ether_token.ts
index 857371578..dbb4d2ee6 100644
--- a/packages/contracts/test/ts/ether_token.ts
+++ b/packages/contracts/test/ts/ether_token.ts
@@ -1,7 +1,7 @@
 import {ZeroEx, ZeroExError} from '0x.js';
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as chai from 'chai';
-import promisify = require('es6-promisify');
 import Web3 = require('web3');
 
 import {Artifacts} from '../../util/artifacts';
@@ -30,9 +30,9 @@ contract('EtherToken', (accounts: string[]) => {
         });
     });
 
-    const sendTransactionAsync = promisify(web3.eth.sendTransaction);
+    const sendTransactionAsync = promisify<string>(web3.eth.sendTransaction);
     const getEthBalanceAsync = async (owner: string) => {
-        const balanceStr = await promisify(web3.eth.getBalance)(owner);
+        const balanceStr = await promisify<string>(web3.eth.getBalance)(owner);
         const balance = new BigNumber(balanceStr);
         return balance;
     };
diff --git a/packages/contracts/test/ts/multi_sig_with_time_lock.ts b/packages/contracts/test/ts/multi_sig_with_time_lock.ts
index 6ab3014ab..6dd4dc3b2 100644
--- a/packages/contracts/test/ts/multi_sig_with_time_lock.ts
+++ b/packages/contracts/test/ts/multi_sig_with_time_lock.ts
@@ -1,6 +1,6 @@
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as chai from 'chai';
-import promisify = require('es6-promisify');
 import Web3 = require('web3');
 
 import * as multiSigWalletJSON from '../../build/contracts/MultiSigWalletWithTimeLock.json';
@@ -64,8 +64,8 @@ contract('MultiSigWalletWithTimeLock', (accounts: string[]) => {
         it('should set confirmation time with enough confirmations', async () => {
             const res = await multiSig.confirmTransaction(txId, {from: owners[1]});
             expect(res.logs).to.have.length(2);
-            const blockNum = await promisify(web3.eth.getBlockNumber)();
-            const blockInfo = await promisify(web3.eth.getBlock)(blockNum);
+            const blockNum = await promisify<number>(web3.eth.getBlockNumber)();
+            const blockInfo = await promisify<Web3.BlockWithoutTransactionData>(web3.eth.getBlock)(blockNum);
             const timestamp = new BigNumber(blockInfo.timestamp);
             const confirmationTimeBigNum = new BigNumber(await multiSig.confirmationTimes.call(txId));
 
diff --git a/packages/contracts/util/order.ts b/packages/contracts/util/order.ts
index 8e3822188..ec5362b66 100644
--- a/packages/contracts/util/order.ts
+++ b/packages/contracts/util/order.ts
@@ -1,5 +1,5 @@
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
-import promisify = require('es6-promisify');
 import ethUtil = require('ethereumjs-util');
 import * as _ from 'lodash';
 import Web3 = require('web3');
@@ -33,7 +33,7 @@ export class Order {
     }
     public async signAsync() {
         const orderHash = this.getOrderHash();
-        const signature = await promisify(web3.eth.sign)(this.params.maker, orderHash);
+        const signature = await promisify<string>(web3.eth.sign)(this.params.maker, orderHash);
         const {v, r, s} = ethUtil.fromRpcSig(signature);
         this.params = _.assign(this.params, {
             orderHashHex: orderHash,
diff --git a/packages/json-schemas/package.json b/packages/json-schemas/package.json
index 0181e4dd4..52deb2254 100644
--- a/packages/json-schemas/package.json
+++ b/packages/json-schemas/package.json
@@ -5,7 +5,7 @@
   "main": "lib/src/index.js",
   "types": "lib/src/index.d.ts",
   "scripts": {
-    "lint": "tslint --project . src/*.ts test/*.ts",
+    "lint": "tslint --project . 'src/**/*.ts' 'test/**/*.ts'",
     "test": "run-s clean build run_mocha",
     "test:circleci": "yarn test",
     "run_mocha": "mocha lib/test/**/*_test.js",
@@ -23,12 +23,12 @@
   },
   "homepage": "https://github.com/0xProject/0x.js/packages/json-schemas/README.md",
   "dependencies": {
-    "es6-promisify": "^5.0.0",
     "jsonschema": "^1.2.0",
     "lodash.values": "^4.3.0"
   },
   "devDependencies": {
     "@0xproject/tslint-config": "^0.2.0",
+    "@0xproject/utils": "^0.0.1",
     "@types/lodash.foreach": "^4.5.3",
     "@types/lodash.values": "^4.3.3",
     "@types/mocha": "^2.2.42",
diff --git a/packages/json-schemas/src/globals.d.ts b/packages/json-schemas/src/globals.d.ts
index 157705f57..91ed2021e 100644
--- a/packages/json-schemas/src/globals.d.ts
+++ b/packages/json-schemas/src/globals.d.ts
@@ -1,7 +1 @@
 declare module 'dirty-chai';
-
-// es6-promisify declarations
-declare function promisify(original: any, settings?: any): ((...arg: any[]) => Promise<any>);
-declare module 'es6-promisify' {
-    export = promisify;
-}
diff --git a/packages/json-schemas/test/schema_test.ts b/packages/json-schemas/test/schema_test.ts
index 758ccac61..8a2f9407d 100644
--- a/packages/json-schemas/test/schema_test.ts
+++ b/packages/json-schemas/test/schema_test.ts
@@ -1,7 +1,7 @@
+import {promisify} from '@0xproject/utils';
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
 import * as dirtyChai from 'dirty-chai';
-import promisify = require('es6-promisify');
 import forEach = require('lodash.foreach');
 import 'mocha';
 
diff --git a/packages/monorepo-scripts/package.json b/packages/monorepo-scripts/package.json
index 3c49429e9..ebd3c60ea 100644
--- a/packages/monorepo-scripts/package.json
+++ b/packages/monorepo-scripts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@0xproject/monorepo-scripts",
-  "version": "0.0.0",
+  "version": "0.0.1",
   "private": true,
   "description": "Helper scripts for the monorepo",
   "scripts": {
diff --git a/packages/types/README.md b/packages/types/README.md
new file mode 100644
index 000000000..d4d48b1fe
--- /dev/null
+++ b/packages/types/README.md
@@ -0,0 +1,10 @@
+0x types
+------
+
+TS types shared across 0x projects and packages
+
+## Install
+
+```bash
+yarn add -D @0xproject/types
+```
diff --git a/packages/types/package.json b/packages/types/package.json
new file mode 100644
index 000000000..f55be284e
--- /dev/null
+++ b/packages/types/package.json
@@ -0,0 +1,32 @@
+{
+  "name": "@0xproject/types",
+  "version": "0.0.1",
+  "description": "0x types",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "clean": "shx rm -rf lib",
+    "lint": "tslint --project . 'src/**/*.ts'"
+  },
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/0xProject/0x.js.git"
+  },
+  "bugs": {
+    "url": "https://github.com/0xProject/0x.js/issues"
+  },
+  "homepage": "https://github.com/0xProject/0x.js/packages/types/README.md",
+  "devDependencies": {
+    "@0xproject/tslint-config": "^0.2.0",
+    "bignumber.js": "^5.0.0",
+    "shx": "^0.2.2",
+    "tslint": "5.8.0",
+    "typescript": "~2.6.1"
+  },
+  "dependencies": {
+    "bignumber.js": "~4.1.0",
+    "web3": "^0.20.0"
+  }
+}
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
new file mode 100644
index 000000000..8d69af63d
--- /dev/null
+++ b/packages/types/src/index.ts
@@ -0,0 +1,23 @@
+import {BigNumber} from 'bignumber.js';
+import * as Web3 from 'web3';
+
+export interface TxData {
+    from?: string;
+    gas?: number;
+    gasPrice?: BigNumber;
+    nonce?: number;
+}
+
+export interface TransactionReceipt {
+    blockHash: string;
+    blockNumber: number;
+    transactionHash: string;
+    transactionIndex: number;
+    from: string;
+    to: string;
+    status: null|0|1;
+    cumulativeGasUsed: number;
+    gasUsed: number;
+    contractAddress: string|null;
+    logs: Web3.LogEntry[];
+}
diff --git a/packages/types/tsconfig.json b/packages/types/tsconfig.json
new file mode 100644
index 000000000..de186cfc4
--- /dev/null
+++ b/packages/types/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5",
+    "lib": [ "es2017", "dom"],
+    "outDir": "lib",
+    "sourceMap": true,
+    "declaration": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true
+  },
+  "include": [
+    "./src/**/*",
+    "../../node_modules/web3-typescript-typings/index.d.ts"
+  ]
+}
diff --git a/packages/types/tslint.json b/packages/types/tslint.json
new file mode 100644
index 000000000..a07795151
--- /dev/null
+++ b/packages/types/tslint.json
@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "@0xproject/tslint-config"
+  ]
+}
diff --git a/packages/utils/README.md b/packages/utils/README.md
new file mode 100644
index 000000000..5191e0350
--- /dev/null
+++ b/packages/utils/README.md
@@ -0,0 +1,10 @@
+utils
+------
+
+Utils to be shared across 0x projects and packages
+
+## Install
+
+```bash
+yarn add @0xproject/utils
+```
diff --git a/packages/utils/package.json b/packages/utils/package.json
new file mode 100644
index 000000000..f49a95f28
--- /dev/null
+++ b/packages/utils/package.json
@@ -0,0 +1,33 @@
+{
+  "name": "@0xproject/utils",
+  "version": "0.0.1",
+  "description": "0x TS utils",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "clean": "shx rm -rf lib",
+    "lint": "tslint --project . 'src/**/*.ts'"
+  },
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/0xProject/0x.js.git"
+  },
+  "bugs": {
+    "url": "https://github.com/0xProject/0x.js/issues"
+  },
+  "homepage": "https://github.com/0xProject/0x.js/packages/utils/README.md",
+  "devDependencies": {
+    "@0xproject/tslint-config": "^0.2.0",
+    "@types/lodash": "^4.14.86",
+    "npm-run-all": "^4.1.2",
+    "shx": "^0.2.2",
+    "tslint": "5.8.0",
+    "typescript": "~2.6.1"
+  },
+  "dependencies": {
+    "bignumber.js": "~4.1.0",
+    "lodash": "^4.17.4"
+  }
+}
diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
new file mode 100644
index 000000000..a61f04ad2
--- /dev/null
+++ b/packages/utils/src/index.ts
@@ -0,0 +1 @@
+export {promisify} from './promisify';
diff --git a/packages/0x.js/src/utils/promisify.ts b/packages/utils/src/promisify.ts
index c114cf32f..c114cf32f 100644
--- a/packages/0x.js/src/utils/promisify.ts
+++ b/packages/utils/src/promisify.ts
diff --git a/packages/utils/tsconfig.json b/packages/utils/tsconfig.json
new file mode 100644
index 000000000..111df6d3b
--- /dev/null
+++ b/packages/utils/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5",
+    "lib": [ "es2017", "dom"],
+    "outDir": "lib",
+    "sourceMap": true,
+    "declaration": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true
+  },
+  "include": [
+    "./src/**/*"
+  ]
+}
diff --git a/packages/utils/tslint.json b/packages/utils/tslint.json
new file mode 100644
index 000000000..a07795151
--- /dev/null
+++ b/packages/utils/tslint.json
@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "@0xproject/tslint-config"
+  ]
+}
diff --git a/packages/web3-wrapper/README.md b/packages/web3-wrapper/README.md
new file mode 100644
index 000000000..0df8c6333
--- /dev/null
+++ b/packages/web3-wrapper/README.md
@@ -0,0 +1,10 @@
+Web3 wrapper
+------
+
+Wrapped version of web3 with nicer interface to be used across 0x projects and packages
+
+## Install
+
+```bash
+yarn add @0xproject/web3-wrapper
+```
diff --git a/packages/web3-wrapper/package.json b/packages/web3-wrapper/package.json
new file mode 100644
index 000000000..4eea7ed31
--- /dev/null
+++ b/packages/web3-wrapper/package.json
@@ -0,0 +1,37 @@
+{
+  "name": "@0xproject/web3-wrapper",
+  "version": "0.0.1",
+  "description": "Wraps around web3 and gives a nicer interface",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "clean": "shx rm -rf lib",
+    "lint": "tslint --project . 'src/**/*.ts'"
+  },
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/0xProject/0x.js.git"
+  },
+  "bugs": {
+    "url": "https://github.com/0xProject/0x.js/issues"
+  },
+  "homepage": "https://github.com/0xProject/0x.js/packages/web3-wrapper/README.md",
+  "devDependencies": {
+    "@0xproject/tslint-config": "^0.2.0",
+    "@0xproject/types": "^0.0.1",
+    "@types/lodash": "^4.14.86",
+    "npm-run-all": "^4.1.2",
+    "shx": "^0.2.2",
+    "tslint": "5.8.0",
+    "typescript": "~2.6.1",
+    "web3-typescript-typings": "^0.7.2"
+  },
+  "dependencies": {
+    "@0xproject/utils": "^0.0.1",
+    "bignumber.js": "~4.1.0",
+    "lodash": "^4.17.4",
+    "web3": "^0.20.0"
+  }
+}
diff --git a/packages/0x.js/src/web3_wrapper.ts b/packages/web3-wrapper/src/index.ts
index 6a6b4e760..7df24e9a5 100644
--- a/packages/0x.js/src/web3_wrapper.ts
+++ b/packages/web3-wrapper/src/index.ts
@@ -1,10 +1,9 @@
+import {TransactionReceipt, TxData} from '@0xproject/types';
+import {promisify} from '@0xproject/utils';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
-import {Artifact, ArtifactContractName, TransactionReceipt, TxData, ZeroExError} from './types';
-import {promisify} from './utils/promisify';
-
 interface RawLogEntry {
     logIndex: string|null;
     transactionIndex: string|null;
@@ -16,21 +15,11 @@ interface RawLogEntry {
     topics: string[];
 }
 
-const CONTRACT_NAME_TO_NOT_FOUND_ERROR: {[contractName: string]: ZeroExError} = {
-    ZRX: ZeroExError.ZRXContractDoesNotExist,
-    EtherToken: ZeroExError.EtherTokenContractDoesNotExist,
-    Token: ZeroExError.TokenContractDoesNotExist,
-    TokenRegistry: ZeroExError.TokenRegistryContractDoesNotExist,
-    TokenTransferProxy: ZeroExError.TokenTransferProxyContractDoesNotExist,
-    Exchange: ZeroExError.ExchangeContractDoesNotExist,
-};
-
 export class Web3Wrapper {
     private web3: Web3;
-    private networkId: number;
     private defaults: Partial<TxData>;
     private jsonRpcRequestId: number;
-    constructor(provider: Web3.Provider, networkId: number, defaults?: Partial<TxData>) {
+    constructor(provider: Web3.Provider, defaults?: Partial<TxData>) {
         if (_.isUndefined((provider as any).sendAsync)) {
             // Web3@1.0 provider doesn't support synchronous http requests,
             // so it only has an async `send` method, instead of a `send` and `sendAsync` in web3@0.x.x`
@@ -38,7 +27,6 @@ export class Web3Wrapper {
             (provider as any).sendAsync = (provider as any).send;
         }
         this.web3 = new Web3();
-        this.networkId = networkId;
         this.web3.setProvider(provider);
         this.defaults = defaults || {};
         this.jsonRpcRequestId = 0;
@@ -47,7 +35,6 @@ export class Web3Wrapper {
         return this.defaults;
     }
     public setProvider(provider: Web3.Provider, networkId: number) {
-        this.networkId = networkId;
         this.web3.setProvider(provider);
     }
     public isAddress(address: string): boolean {
@@ -61,6 +48,11 @@ export class Web3Wrapper {
         const nodeVersion = await promisify<string>(this.web3.version.getNode)();
         return nodeVersion;
     }
+    public async getNetworkIdAsync(): Promise<number> {
+        const networkIdStr = await promisify<string>(this.web3.version.getNetwork)();
+        const networkId = _.parseInt(networkIdStr);
+        return networkId;
+    }
     public async getTransactionReceiptAsync(txHash: string): Promise<TransactionReceipt> {
         const transactionReceipt = await promisify<TransactionReceipt>(this.web3.eth.getTransactionReceipt)(txHash);
         if (!_.isNull(transactionReceipt)) {
@@ -71,37 +63,13 @@ export class Web3Wrapper {
     public getCurrentProvider(): Web3.Provider {
         return this.web3.currentProvider;
     }
-    public getNetworkId(): number {
-        return this.networkId;
-    }
-    public async getContractInstanceFromArtifactAsync(
-        artifact: Artifact, address?: string,
-    ): Promise<Web3.ContractInstance> {
-        let contractAddress: string;
-        if (_.isUndefined(address)) {
-            const networkId = this.getNetworkId();
-            if (_.isUndefined(artifact.networks[networkId])) {
-                throw new Error(ZeroExError.ContractNotDeployedOnNetwork);
-            }
-            contractAddress = artifact.networks[networkId].address.toLowerCase();
-        } else {
-            contractAddress = address;
-        }
-        const doesContractExist = await this.doesContractExistAtAddressAsync(contractAddress);
-        if (!doesContractExist) {
-            throw new Error(CONTRACT_NAME_TO_NOT_FOUND_ERROR[artifact.contract_name]);
-        }
-        const contractInstance = this.getContractInstance(
-            artifact.abi, contractAddress,
-        );
-        return contractInstance;
-    }
     public toWei(ethAmount: BigNumber): BigNumber {
         const balanceWei = this.web3.toWei(ethAmount, 'ether');
         return balanceWei;
     }
     public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
         let balanceInWei = await promisify<BigNumber>(this.web3.eth.getBalance)(owner);
+        // Rewrap in a new BigNumber
         balanceInWei = new BigNumber(balanceInWei);
         return balanceInWei;
     }
@@ -155,13 +123,17 @@ export class Web3Wrapper {
         const formattedLogs = _.map(rawLogs, this.formatLog.bind(this));
         return formattedLogs;
     }
-    private getContractInstance(abi: Web3.ContractAbi, address: string): Web3.ContractInstance {
-        const web3ContractInstance = this.web3.eth.contract(abi).at(address);
+    public getContractFromAbi(abi: Web3.ContractAbi): Web3.Contract<any> {
+        const web3Contract = this.web3.eth.contract(abi);
+        return web3Contract;
+    }
+    public getContractInstance(abi: Web3.ContractAbi, address: string): Web3.ContractInstance {
+        const web3ContractInstance = this.getContractFromAbi(abi).at(address);
         return web3ContractInstance;
     }
-    private async getNetworkAsync(): Promise<number> {
-        const networkId = await promisify<number>(this.web3.version.getNetwork)();
-        return networkId;
+    public async estimateGasAsync(data: string): Promise<number> {
+        const gas = await promisify<number>(this.web3.eth.estimateGas)({data});
+        return gas;
     }
     private async sendRawPayloadAsync<A>(payload: Web3.JSONRPCRequestPayload): Promise<A> {
         const sendAsync = this.web3.currentProvider.sendAsync.bind(this.web3.currentProvider);
diff --git a/packages/web3-wrapper/tsconfig.json b/packages/web3-wrapper/tsconfig.json
new file mode 100644
index 000000000..de186cfc4
--- /dev/null
+++ b/packages/web3-wrapper/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5",
+    "lib": [ "es2017", "dom"],
+    "outDir": "lib",
+    "sourceMap": true,
+    "declaration": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true
+  },
+  "include": [
+    "./src/**/*",
+    "../../node_modules/web3-typescript-typings/index.d.ts"
+  ]
+}
diff --git a/packages/web3-wrapper/tslint.json b/packages/web3-wrapper/tslint.json
new file mode 100644
index 000000000..a07795151
--- /dev/null
+++ b/packages/web3-wrapper/tslint.json
@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "@0xproject/tslint-config"
+  ]
+}
diff --git a/packages/website/package.json b/packages/website/package.json
index 68e9e8f47..fdc5de5d7 100644
--- a/packages/website/package.json
+++ b/packages/website/package.json
@@ -27,7 +27,6 @@
     "dateformat": "^2.0.0",
     "deep-equal": "^1.0.1",
     "dharma-loan-frame": "^0.0.12",
-    "es6-promisify": "^5.0.0",
     "ethereum-address": "^0.0.4",
     "ethereumjs-tx": "^1.3.3",
     "ethereumjs-util": "^5.1.1",
diff --git a/packages/website/ts/blockchain.ts b/packages/website/ts/blockchain.ts
index aea4f863c..24205802d 100644
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -16,9 +16,9 @@ import {
     ZeroEx,
     ZeroExError,
 } from '0x.js';
+import {promisify} from '@0xproject/utils';
 import BigNumber from 'bignumber.js';
 import compareVersions = require('compare-versions');
-import promisify = require('es6-promisify');
 import ethUtil = require('ethereumjs-util');
 import findVersions = require('find-versions');
 import * as _ from 'lodash';
@@ -65,7 +65,7 @@ export class Blockchain {
     public nodeVersion: string;
     private zeroEx: ZeroEx;
     private dispatcher: Dispatcher;
-    private web3Wrapper: Web3Wrapper;
+    private web3Wrapper?: Web3Wrapper;
     private exchangeAddress: string;
     private tokenTransferProxy: ContractInstance;
     private tokenRegistry: ContractInstance;
@@ -624,7 +624,7 @@ export class Blockchain {
         let networkIdIfExists: number;
         if (!_.isUndefined(injectedWeb3)) {
             try {
-                networkIdIfExists = _.parseInt(await promisify(injectedWeb3.version.getNetwork)());
+                networkIdIfExists = _.parseInt(await promisify<string>(injectedWeb3.version.getNetwork)());
             } catch (err) {
                 // Ignore error and proceed with networkId undefined
             }
diff --git a/packages/website/ts/components/ui/lifecycle_raised_button.tsx b/packages/website/ts/components/ui/lifecycle_raised_button.tsx
index 338a3bf76..cba94ca8c 100644
--- a/packages/website/ts/components/ui/lifecycle_raised_button.tsx
+++ b/packages/website/ts/components/ui/lifecycle_raised_button.tsx
@@ -20,7 +20,7 @@ interface LifeCycleRaisedButtonProps {
     labelReady: React.ReactNode|string;
     labelLoading: React.ReactNode|string;
     labelComplete: React.ReactNode|string;
-    onClickAsyncFn: () => boolean;
+    onClickAsyncFn: () => Promise<boolean>;
     backgroundColor?: string;
     labelColor?: string;
 }
diff --git a/packages/website/ts/globals.d.ts b/packages/website/ts/globals.d.ts
index c5b94dc45..7bbbb3a98 100644
--- a/packages/website/ts/globals.d.ts
+++ b/packages/website/ts/globals.d.ts
@@ -1,6 +1,5 @@
 declare module 'react-tooltip';
 declare module 'react-router-hash-link';
-declare module 'es6-promisify';
 declare module 'truffle-contract';
 declare module 'ethereumjs-util';
 declare module 'keccak';
diff --git a/packages/website/ts/subproviders/redundant_rpc_subprovider.ts b/packages/website/ts/subproviders/redundant_rpc_subprovider.ts
index 8dffd4437..d540e6e7b 100644
--- a/packages/website/ts/subproviders/redundant_rpc_subprovider.ts
+++ b/packages/website/ts/subproviders/redundant_rpc_subprovider.ts
@@ -1,4 +1,4 @@
-import promisify = require('es6-promisify');
+import {promisify} from '@0xproject/utils';
 import * as _ from 'lodash';
 import {JSONRPCPayload} from 'ts/types';
 import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
diff --git a/packages/website/ts/web3_wrapper.ts b/packages/website/ts/web3_wrapper.ts
index c43436c7e..b713f8a33 100644
--- a/packages/website/ts/web3_wrapper.ts
+++ b/packages/website/ts/web3_wrapper.ts
@@ -1,8 +1,8 @@
+import {promisify} from '@0xproject/utils';
 import BigNumber from 'bignumber.js';
-import promisify = require('es6-promisify');
 import * as _ from 'lodash';
 import {Dispatcher} from 'ts/redux/dispatcher';
-import Web3 = require('web3');
+import * as Web3 from 'web3';
 
 export class Web3Wrapper {
     private dispatcher: Dispatcher;
@@ -28,7 +28,7 @@ export class Web3Wrapper {
         return this.web3.isAddress(address);
     }
     public async getAccountsAsync(): Promise<string[]> {
-        const addresses = await promisify(this.web3.eth.getAccounts)();
+        const addresses = await promisify<string[]>(this.web3.eth.getAccounts)();
         return addresses;
     }
     public async getFirstAccountIfExistsAsync() {
@@ -38,8 +38,8 @@ export class Web3Wrapper {
         }
         return (addresses)[0];
     }
-    public async getNodeVersionAsync() {
-        const nodeVersion = await promisify(this.web3.version.getNode)();
+    public async getNodeVersionAsync(): Promise<string> {
+        const nodeVersion = await promisify<string>(this.web3.version.getNode)();
         return nodeVersion;
     }
     public getProviderObj() {
@@ -54,24 +54,24 @@ export class Web3Wrapper {
         }
     }
     public async getBalanceInEthAsync(owner: string): Promise<BigNumber> {
-        const balanceInWei: BigNumber = await promisify(this.web3.eth.getBalance)(owner);
+        const balanceInWei: BigNumber = await promisify<BigNumber>(this.web3.eth.getBalance)(owner);
         const balanceEthOldBigNumber = this.web3.fromWei(balanceInWei, 'ether');
         const balanceEth = new BigNumber(balanceEthOldBigNumber);
         return balanceEth;
     }
     public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
-        const code = await promisify(this.web3.eth.getCode)(address);
+        const code = await promisify<string>(this.web3.eth.getCode)(address);
         // Regex matches 0x0, 0x00, 0x in order to accomodate poorly implemented clients
         const zeroHexAddressRegex = /^0[xX][0]*$/;
         const didFindCode = _.isNull(code.match(zeroHexAddressRegex));
         return didFindCode;
     }
     public async signTransactionAsync(address: string, message: string): Promise<string> {
-        const signData = await promisify(this.web3.eth.sign)(address, message);
+        const signData = await promisify<string>(this.web3.eth.sign)(address, message);
         return signData;
     }
     public async getBlockTimestampAsync(blockHash: string): Promise<number> {
-        const {timestamp} = await promisify(this.web3.eth.getBlock)(blockHash);
+        const {timestamp} = await promisify<Web3.BlockWithoutTransactionData>(this.web3.eth.getBlock)(blockHash);
         return timestamp;
     }
     public destroy() {
diff --git a/scripts/postpublish_utils.js b/scripts/postpublish_utils.js
index e2c23ee14..e9563a51c 100644
--- a/scripts/postpublish_utils.js
+++ b/scripts/postpublish_utils.js
@@ -1,6 +1,6 @@
 const execAsync = require('async-child-process').execAsync;
 const semverSort = require('semver-sort');
-const promisify = require('es6-promisify');
+import {promisify} from '@0xproject/utils';
 const publishRelease = require('publish-release');
 
 const publishReleaseAsync = promisify(publishRelease);
diff --git a/yarn.lock b/yarn.lock
index a232f3318..7adc2837b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -102,6 +102,10 @@
   version "4.6.2"
   resolved "https://registry.yarnpkg.com/@types/history/-/history-4.6.2.tgz#12cfaba693ba20f114ed5765467ff25fdf67ddb0"
 
+"@types/isomorphic-fetch@^0.0.34":
+  version "0.0.34"
+  resolved "https://registry.yarnpkg.com/@types/isomorphic-fetch/-/isomorphic-fetch-0.0.34.tgz#3c3483e606c041378438e951464f00e4e60706d6"
+
 "@types/jsonschema@^1.1.1":
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/@types/jsonschema/-/jsonschema-1.1.1.tgz#08703dfe074010e8e829123111594af731f57b1a"
@@ -163,7 +167,7 @@
   dependencies:
     moment "*"
 
-"@types/node@*", "@types/node@^8.0.1":
+"@types/node@*":
   version "8.0.51"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-8.0.51.tgz#b31d716fb8d58eeb95c068a039b9b6292817d5fb"
 
@@ -1277,6 +1281,10 @@ bignumber.js@^4.0.2, bignumber.js@^4.1.0, bignumber.js@~4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-4.1.0.tgz#db6f14067c140bd46624815a7916c92d9b6c24b1"
 
+bignumber.js@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/bignumber.js/-/bignumber.js-5.0.0.tgz#fbce63f09776b3000a83185badcde525daf34833"
+
 "bignumber.js@git+https://github.com/debris/bignumber.js#master":
   version "2.0.7"
   resolved "git+https://github.com/debris/bignumber.js#c7a38de919ed75e6fb6ba38051986e294b328df9"
@@ -5617,7 +5625,7 @@ normalize-url@^1.4.0:
     query-string "^4.1.0"
     sort-keys "^1.0.0"
 
-npm-run-all@^4.1.2:
+npm-run-all@^4.1.1, npm-run-all@^4.1.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npm-run-all/-/npm-run-all-4.1.2.tgz#90d62d078792d20669139e718621186656cea056"
   dependencies: