Merge branch 'development' into feature/addSubproviders

* development: (50 commits)
  Add PR number to changelog
  Address feedback
  Add requestId to subscription messages and update json-schemas
  Remove isomorphic-fetch types from contracts package
  Update README
  Regenerate files
  Make it private
  Change package name
  Update README
  Make fileExtension configurable
  Rename abi-gen to typed-contracts
  Add docs for typed-contracts
  Remove TODOs
  Introduce separate ContextData type and rework it
  Check ABI is defined
  Introduce a const for 'contract.mustache'
  Improve error message
  Reuse util
  Fix a typo
  Introduce a const for 'function'
  ...

# Conflicts:
#	yarn.lock

21 files changed, 2316 insertions, 301 deletions

diff --git a/packages/0x.js/package.json b/packages/0x.js/package.json
index 593521258..2052823dd 100644
--- a/packages/0x.js/package.json
+++ b/packages/0x.js/package.json
@@ -16,6 +16,7 @@
     "build": "run-p build:umd:prod build:commonjs; exit 0;",
     "docs:json": "typedoc --excludePrivate --excludeExternals --target ES5 --json $JSON_FILE_PATH $PROJECT_DIR",
     "upload_docs_json": "aws s3 cp generated_docs/index.json $S3_URL --profile 0xproject --grants read=uri=http://acs.amazonaws.com/groups/global/AllUsers --content-type application/json",
+    "generate_contract_wrappers": "abi-gen --abiGlob 'src/artifacts/@(Exchange|Token|TokenTransferProxy|EtherToken|TokenRegistry).json' --templates ../abi-gen-templates/ --output src/contract_wrappers/generated --fileExtension ts",
     "lint": "tslint --project . 'src/**/*.ts' 'test/**/*.ts'",
     "test:circleci": "run-s test:coverage report_test_coverage && if [ $CIRCLE_BRANCH = \"development\" ]; then yarn test:umd; fi",
     "test": "run-s clean test:commonjs",
@@ -45,6 +46,8 @@
   },
   "devDependencies": {
     "@0xproject/tslint-config": "^0.2.0",
+    "abi-gen": "^0.0.0",
+    "abi-gen-templates": "^0.0.0",
     "@types/bintrees": "^1.0.2",
     "@types/jsonschema": "^1.1.1",
     "@types/lodash": "^4.14.64",
@@ -88,7 +91,6 @@
     "bintrees": "^1.0.2",
     "bn.js": "4.11.8",
     "compare-versions": "^3.0.1",
-    "es6-promisify": "^5.0.0",
     "ethereumjs-abi": "^0.6.4",
     "ethereumjs-blockstream": "^2.0.6",
     "ethereumjs-util": "^5.1.1",
diff --git a/packages/0x.js/src/contract.ts b/packages/0x.js/src/contract.ts
deleted file mode 100644
index a4ee03910..000000000
--- a/packages/0x.js/src/contract.ts
+++ /dev/null
@@ -1,98 +0,0 @@
-import {schemas, SchemaValidator} from '@0xproject/json-schemas';
-import promisify = require('es6-promisify');
-import * as _ from 'lodash';
-import * as Web3 from 'web3';
-
-import {AbiType} from './types';
-
-// HACK: Gas estimates on testrpc don't take into account gas refunds.
-// Our calls can trigger max 8 gas refunds for SSTORE per transaction for 15k gas each which gives 120k.
-const GAS_MARGIN = 120000;
-
-export class Contract implements Web3.ContractInstance {
-    public address: string;
-    public abi: Web3.ContractAbi;
-    private contract: Web3.ContractInstance;
-    private defaults: Partial<Web3.TxData>;
-    private validator: SchemaValidator;
-    // This class instance is going to be populated with functions and events depending on the ABI
-    // and we don't know their types in advance
-    [name: string]: any;
-    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<Web3.TxData>) {
-        this.contract = web3ContractInstance;
-        this.address = web3ContractInstance.address;
-        this.abi = web3ContractInstance.abi;
-        this.defaults = defaults;
-        this.populateEvents();
-        this.populateFunctions();
-        this.validator = new SchemaValidator();
-    }
-    private populateFunctions(): void {
-        const functionsAbi = _.filter(this.abi, abiPart => abiPart.type === AbiType.Function);
-        _.forEach(functionsAbi, (functionAbi: Web3.MethodAbi) => {
-            if (functionAbi.constant) {
-                const cbStyleCallFunction = this.contract[functionAbi.name].call;
-                this[functionAbi.name] = {
-                    callAsync: promisify(cbStyleCallFunction, this.contract),
-                };
-            } else {
-                const cbStyleFunction = this.contract[functionAbi.name];
-                const cbStyleEstimateGasFunction = this.contract[functionAbi.name].estimateGas;
-                const estimateGasAsync = promisify(cbStyleEstimateGasFunction, this.contract);
-                this[functionAbi.name] = {
-                    estimateGasAsync,
-                    sendTransactionAsync: this.promisifyWithDefaultParams(cbStyleFunction, estimateGasAsync),
-                };
-            }
-        });
-    }
-    private populateEvents(): void {
-        const eventsAbi = _.filter(this.abi, abiPart => abiPart.type === AbiType.Event);
-        _.forEach(eventsAbi, (eventAbi: Web3.EventAbi) => {
-            this[eventAbi.name] = this.contract[eventAbi.name];
-        });
-    }
-    private promisifyWithDefaultParams(
-        web3CbStyleFunction: (...args: any[]) => void,
-        estimateGasAsync: (...args: any[]) => Promise<number>,
-    ): (...args: any[]) => Promise<any> {
-        const promisifiedWithDefaultParams = async (...args: any[]) => {
-            const promise = new Promise(async (resolve, reject) => {
-                const lastArg = args[args.length - 1];
-                let txData: Partial<Web3.TxData> = {};
-                if (!_.isUndefined(lastArg) && this.isTxData(lastArg)) {
-                    txData = args.pop();
-                }
-                // Gas amount sourced with the following priorities:
-                // 1. Optional param passed in to public method call
-                // 2. Global config passed in at library instantiation
-                // 3. Gas estimate calculation + safety margin
-                const removeUndefinedProperties = _.pickBy;
-                txData = {
-                    ...removeUndefinedProperties(this.defaults),
-                    ...removeUndefinedProperties(txData),
-                };
-                if (_.isUndefined(txData.gas)) {
-                    try {
-                        const estimatedGas = await estimateGasAsync.apply(this.contract, [...args, txData]);
-                        const gas = estimatedGas + GAS_MARGIN;
-                        txData.gas = gas;
-                    } catch (err) {
-                        reject(err);
-                        return;
-                    }
-                }
-                const callback = (err: Error, data: any) => _.isNull(err) ? resolve(data) : reject(err);
-                args.push(txData);
-                args.push(callback);
-                web3CbStyleFunction.apply(this.contract, args);
-            });
-            return promise;
-        };
-        return promisifiedWithDefaultParams;
-    }
-    private isTxData(lastArg: any): boolean {
-        const isValid = this.validator.isValid(lastArg, schemas.txDataSchema);
-        return isValid;
-    }
-}
diff --git a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
index 8c92931b4..5e5a38f8c 100644
--- a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
@@ -90,11 +90,13 @@ export class ContractWrapper {
         const logWithDecodedArgs = this._abiDecoder.tryToDecodeLogOrNoop(log);
         return logWithDecodedArgs;
     }
-    protected async _instantiateContractIfExistsAsync<ContractType extends Web3.ContractInstance>(
-        artifact: Artifact, addressIfExists?: string): Promise<ContractType> {
-        const contractInstance =
-            await this._web3Wrapper.getContractInstanceFromArtifactAsync<ContractType>(artifact, addressIfExists);
-        return contractInstance;
+    protected async _instantiateContractIfExistsAsync(
+        artifact: Artifact, addressIfExists?: string,
+    ): Promise<Web3.ContractInstance> {
+        const web3ContractInstance = await this._web3Wrapper.getContractInstanceFromArtifactAsync(
+            artifact, addressIfExists,
+        );
+        return web3ContractInstance;
     }
     protected _getContractAddress(artifact: Artifact, addressIfExists?: string): string {
         if (_.isUndefined(addressIfExists)) {
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 ede0460bd..26025f6f9 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -2,11 +2,12 @@ import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
-import {EtherTokenContract, TransactionOpts, ZeroExError} from '../types';
+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';
 import {TokenWrapper} from './token_wrapper';
 
 /**
@@ -92,9 +93,10 @@ export class EtherTokenWrapper extends ContractWrapper {
         if (!_.isUndefined(this._etherTokenContractIfExists)) {
             return this._etherTokenContractIfExists;
         }
-        const contractInstance = await this._instantiateContractIfExistsAsync<EtherTokenContract>(
+        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
             artifacts.EtherTokenArtifact, this._contractAddressIfExists,
         );
+        const contractInstance = new EtherTokenContract(web3ContractInstance, this._web3Wrapper.getContractDefaults());
         this._etherTokenContractIfExists = contractInstance;
         return this._etherTokenContractIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index 273b348ff..aaf6256a3 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -9,7 +9,6 @@ import {
     DecodedLogArgs,
     ECSignature,
     EventCallback,
-    ExchangeContract,
     ExchangeContractErrCodes,
     ExchangeContractErrs,
     ExchangeContractEventArgs,
@@ -40,6 +39,7 @@ import {utils} from '../utils/utils';
 import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
+import {ExchangeContract} from './generated/exchange';
 import {TokenWrapper} from './token_wrapper';
 
 const SHOULD_VALIDATE_BY_DEFAULT = true;
@@ -789,9 +789,10 @@ export class ExchangeWrapper extends ContractWrapper {
         if (!_.isUndefined(this._exchangeContractIfExists)) {
             return this._exchangeContractIfExists;
         }
-        const contractInstance = await this._instantiateContractIfExistsAsync<ExchangeContract>(
+        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
             artifacts.ExchangeArtifact, this._contractAddressIfExists,
         );
+        const contractInstance = new ExchangeContract(web3ContractInstance, this._web3Wrapper.getContractDefaults());
         this._exchangeContractIfExists = contractInstance;
         return this._exchangeContractIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/generated/base_contract.ts b/packages/0x.js/src/contract_wrappers/generated/base_contract.ts
new file mode 100644
index 000000000..396a4d593
--- /dev/null
+++ b/packages/0x.js/src/contract_wrappers/generated/base_contract.ts
@@ -0,0 +1,34 @@
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+import {TxData, TxDataPayable} from '../../types';
+
+export class BaseContract {
+    protected web3ContractInstance: Web3.ContractInstance;
+    protected defaults: Partial<TxData>;
+    protected async applyDefaultsToTxDataAsync<T extends TxData|TxDataPayable>(
+        txData: T,
+        estimateGasAsync?: (txData: T) => Promise<number>,
+    ): Promise<TxData> {
+        // Gas amount sourced with the following priorities:
+        // 1. Optional param passed in to public method call
+        // 2. Global config passed in at library instantiation
+        // 3. Gas estimate calculation + safety margin
+        const removeUndefinedProperties = _.pickBy;
+        const txDataWithDefaults = {
+            ...removeUndefinedProperties(this.defaults),
+            ...removeUndefinedProperties(txData as any),
+            // HACK: TS can't prove that T is spreadable.
+            // Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
+        };
+        if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
+            const estimatedGas = await estimateGasAsync(txData);
+            txDataWithDefaults.gas = estimatedGas;
+        }
+        return txDataWithDefaults;
+    }
+    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
+        this.web3ContractInstance = web3ContractInstance;
+        this.defaults = defaults;
+    }
+}
diff --git a/packages/0x.js/src/contract_wrappers/generated/ether_token.ts b/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
new file mode 100644
index 000000000..eed5e4686
--- /dev/null
+++ b/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
@@ -0,0 +1,363 @@
+/**
+ * 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 {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';
+
+export class EtherTokenContract extends BaseContract {
+    public name = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as EtherTokenContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.name.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public approve = {
+        async sendTransactionAsync(
+            _spender: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.approve.estimateGasAsync.bind(
+                    self,
+                    _spender,
+                    _value,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.approve, self.web3ContractInstance,
+            )(
+                _spender,
+                _value,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _spender: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.approve.estimateGas, self.web3ContractInstance,
+            )(
+                _spender,
+                _value,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _spender: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as EtherTokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.approve.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public totalSupply = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as EtherTokenContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.totalSupply.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public transferFrom = {
+        async sendTransactionAsync(
+            _from: string,
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.transferFrom.estimateGasAsync.bind(
+                    self,
+                    _from,
+                    _to,
+                    _value,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.transferFrom, self.web3ContractInstance,
+            )(
+                _from,
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _from: string,
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.transferFrom.estimateGas, self.web3ContractInstance,
+            )(
+                _from,
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _from: string,
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as EtherTokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.transferFrom.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public withdraw = {
+        async sendTransactionAsync(
+            amount: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.withdraw.estimateGasAsync.bind(
+                    self,
+                    amount,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.withdraw, self.web3ContractInstance,
+            )(
+                amount,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            amount: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.withdraw.estimateGas, self.web3ContractInstance,
+            )(
+                amount,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            amount: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as EtherTokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.withdraw.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public decimals = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as EtherTokenContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.decimals.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public balanceOf = {
+        async callAsync(
+            _owner: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as EtherTokenContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.balanceOf.call,
+                self.web3ContractInstance,
+            )(
+                _owner,
+            );
+            return result;
+        },
+    };
+    public symbol = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as EtherTokenContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.symbol.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public transfer = {
+        async sendTransactionAsync(
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.transfer.estimateGasAsync.bind(
+                    self,
+                    _to,
+                    _value,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.transfer, self.web3ContractInstance,
+            )(
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.transfer.estimateGas, self.web3ContractInstance,
+            )(
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as EtherTokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.transfer.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public deposit = {
+        async sendTransactionAsync(
+            txData: TxDataPayable = {},
+        ): Promise<string> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.deposit.estimateGasAsync.bind(
+                    self,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.deposit, self.web3ContractInstance,
+            )(
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as EtherTokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.deposit.estimateGas, self.web3ContractInstance,
+            )(
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            txData: TxData = {},
+        ): string {
+            const self = this as EtherTokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.deposit.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public allowance = {
+        async callAsync(
+            _owner: string,
+            _spender: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as EtherTokenContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.allowance.call,
+                self.web3ContractInstance,
+            )(
+                _owner,
+                _spender,
+            );
+            return result;
+        },
+    };
+    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
+        super(web3ContractInstance, defaults);
+        classUtils.bindAll(this, ['web3ContractInstance', 'defaults']);
+    }
+} // tslint:disable:max-file-line-count
diff --git a/packages/0x.js/src/contract_wrappers/generated/exchange.ts b/packages/0x.js/src/contract_wrappers/generated/exchange.ts
new file mode 100644
index 000000000..8c25ca014
--- /dev/null
+++ b/packages/0x.js/src/contract_wrappers/generated/exchange.ts
@@ -0,0 +1,730 @@
+/**
+ * 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 {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';
+
+export class ExchangeContract extends BaseContract {
+    public isRoundingError = {
+        async callAsync(
+            numerator: BigNumber,
+            denominator: BigNumber,
+            target: BigNumber,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<boolean
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<boolean
+    >(
+                self.web3ContractInstance.isRoundingError.call,
+                self.web3ContractInstance,
+            )(
+                numerator,
+                denominator,
+                target,
+            );
+            return result;
+        },
+    };
+    public filled = {
+        async callAsync(
+            index: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.filled.call,
+                self.web3ContractInstance,
+            )(
+                index,
+            );
+            return result;
+        },
+    };
+    public cancelled = {
+        async callAsync(
+            index: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.cancelled.call,
+                self.web3ContractInstance,
+            )(
+                index,
+            );
+            return result;
+        },
+    };
+    public fillOrdersUpTo = {
+        async sendTransactionAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmount: BigNumber,
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.fillOrdersUpTo.estimateGasAsync.bind(
+                    self,
+                    orderAddresses,
+                    orderValues,
+                    fillTakerTokenAmount,
+                    shouldThrowOnInsufficientBalanceOrAllowance,
+                    v,
+                    r,
+                    s,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.fillOrdersUpTo, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmount,
+                shouldThrowOnInsufficientBalanceOrAllowance,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmount: BigNumber,
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.fillOrdersUpTo.estimateGas, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmount,
+                shouldThrowOnInsufficientBalanceOrAllowance,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmount: BigNumber,
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): string {
+            const self = this as ExchangeContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.fillOrdersUpTo.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public cancelOrder = {
+        async sendTransactionAsync(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            cancelTakerTokenAmount: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.cancelOrder.estimateGasAsync.bind(
+                    self,
+                    orderAddresses,
+                    orderValues,
+                    cancelTakerTokenAmount,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.cancelOrder, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                cancelTakerTokenAmount,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            cancelTakerTokenAmount: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.cancelOrder.estimateGas, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                cancelTakerTokenAmount,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            cancelTakerTokenAmount: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as ExchangeContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.cancelOrder.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public ZRX_TOKEN_CONTRACT = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.ZRX_TOKEN_CONTRACT.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public batchFillOrKillOrders = {
+        async sendTransactionAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmounts: BigNumber[],
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.batchFillOrKillOrders.estimateGasAsync.bind(
+                    self,
+                    orderAddresses,
+                    orderValues,
+                    fillTakerTokenAmounts,
+                    v,
+                    r,
+                    s,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.batchFillOrKillOrders, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmounts,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmounts: BigNumber[],
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.batchFillOrKillOrders.estimateGas, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmounts,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmounts: BigNumber[],
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): string {
+            const self = this as ExchangeContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.batchFillOrKillOrders.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public fillOrKillOrder = {
+        async sendTransactionAsync(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            fillTakerTokenAmount: BigNumber,
+            v: number|BigNumber,
+            r: string,
+            s: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.fillOrKillOrder.estimateGasAsync.bind(
+                    self,
+                    orderAddresses,
+                    orderValues,
+                    fillTakerTokenAmount,
+                    v,
+                    r,
+                    s,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.fillOrKillOrder, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmount,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            fillTakerTokenAmount: BigNumber,
+            v: number|BigNumber,
+            r: string,
+            s: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.fillOrKillOrder.estimateGas, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmount,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            fillTakerTokenAmount: BigNumber,
+            v: number|BigNumber,
+            r: string,
+            s: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as ExchangeContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.fillOrKillOrder.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public getUnavailableTakerTokenAmount = {
+        async callAsync(
+            orderHash: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.getUnavailableTakerTokenAmount.call,
+                self.web3ContractInstance,
+            )(
+                orderHash,
+            );
+            return result;
+        },
+    };
+    public isValidSignature = {
+        async callAsync(
+            signer: string,
+            hash: string,
+            v: number|BigNumber,
+            r: string,
+            s: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<boolean
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<boolean
+    >(
+                self.web3ContractInstance.isValidSignature.call,
+                self.web3ContractInstance,
+            )(
+                signer,
+                hash,
+                v,
+                r,
+                s,
+            );
+            return result;
+        },
+    };
+    public getPartialAmount = {
+        async callAsync(
+            numerator: BigNumber,
+            denominator: BigNumber,
+            target: BigNumber,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.getPartialAmount.call,
+                self.web3ContractInstance,
+            )(
+                numerator,
+                denominator,
+                target,
+            );
+            return result;
+        },
+    };
+    public TOKEN_TRANSFER_PROXY_CONTRACT = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.TOKEN_TRANSFER_PROXY_CONTRACT.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public batchFillOrders = {
+        async sendTransactionAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmounts: BigNumber[],
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.batchFillOrders.estimateGasAsync.bind(
+                    self,
+                    orderAddresses,
+                    orderValues,
+                    fillTakerTokenAmounts,
+                    shouldThrowOnInsufficientBalanceOrAllowance,
+                    v,
+                    r,
+                    s,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.batchFillOrders, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmounts,
+                shouldThrowOnInsufficientBalanceOrAllowance,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmounts: BigNumber[],
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.batchFillOrders.estimateGas, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmounts,
+                shouldThrowOnInsufficientBalanceOrAllowance,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            fillTakerTokenAmounts: BigNumber[],
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber[],
+            r: string[],
+            s: string[],
+            txData: TxData = {},
+        ): string {
+            const self = this as ExchangeContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.batchFillOrders.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public batchCancelOrders = {
+        async sendTransactionAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            cancelTakerTokenAmounts: BigNumber[],
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.batchCancelOrders.estimateGasAsync.bind(
+                    self,
+                    orderAddresses,
+                    orderValues,
+                    cancelTakerTokenAmounts,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.batchCancelOrders, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                cancelTakerTokenAmounts,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            cancelTakerTokenAmounts: BigNumber[],
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.batchCancelOrders.estimateGas, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                cancelTakerTokenAmounts,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            orderAddresses: string[][],
+            orderValues: BigNumber[][],
+            cancelTakerTokenAmounts: BigNumber[],
+            txData: TxData = {},
+        ): string {
+            const self = this as ExchangeContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.batchCancelOrders.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public fillOrder = {
+        async sendTransactionAsync(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            fillTakerTokenAmount: BigNumber,
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber,
+            r: string,
+            s: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.fillOrder.estimateGasAsync.bind(
+                    self,
+                    orderAddresses,
+                    orderValues,
+                    fillTakerTokenAmount,
+                    shouldThrowOnInsufficientBalanceOrAllowance,
+                    v,
+                    r,
+                    s,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.fillOrder, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmount,
+                shouldThrowOnInsufficientBalanceOrAllowance,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            fillTakerTokenAmount: BigNumber,
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber,
+            r: string,
+            s: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as ExchangeContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.fillOrder.estimateGas, self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+                fillTakerTokenAmount,
+                shouldThrowOnInsufficientBalanceOrAllowance,
+                v,
+                r,
+                s,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            fillTakerTokenAmount: BigNumber,
+            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
+            v: number|BigNumber,
+            r: string,
+            s: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as ExchangeContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.fillOrder.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public getOrderHash = {
+        async callAsync(
+            orderAddresses: string[],
+            orderValues: BigNumber[],
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.getOrderHash.call,
+                self.web3ContractInstance,
+            )(
+                orderAddresses,
+                orderValues,
+            );
+            return result;
+        },
+    };
+    public EXTERNAL_QUERY_GAS_LIMIT = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.EXTERNAL_QUERY_GAS_LIMIT.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public VERSION = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as ExchangeContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.VERSION.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
+        super(web3ContractInstance, defaults);
+        classUtils.bindAll(this, ['web3ContractInstance', 'defaults']);
+    }
+} // tslint:disable:max-file-line-count
diff --git a/packages/0x.js/src/contract_wrappers/generated/token.ts b/packages/0x.js/src/contract_wrappers/generated/token.ts
new file mode 100644
index 000000000..30b06292f
--- /dev/null
+++ b/packages/0x.js/src/contract_wrappers/generated/token.ts
@@ -0,0 +1,232 @@
+/**
+ * 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 {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';
+
+export class TokenContract extends BaseContract {
+    public approve = {
+        async sendTransactionAsync(
+            _spender: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.approve.estimateGasAsync.bind(
+                    self,
+                    _spender,
+                    _value,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.approve, self.web3ContractInstance,
+            )(
+                _spender,
+                _value,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _spender: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.approve.estimateGas, self.web3ContractInstance,
+            )(
+                _spender,
+                _value,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _spender: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.approve.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public totalSupply = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as TokenContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.totalSupply.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public transferFrom = {
+        async sendTransactionAsync(
+            _from: string,
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.transferFrom.estimateGasAsync.bind(
+                    self,
+                    _from,
+                    _to,
+                    _value,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.transferFrom, self.web3ContractInstance,
+            )(
+                _from,
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _from: string,
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.transferFrom.estimateGas, self.web3ContractInstance,
+            )(
+                _from,
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _from: string,
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.transferFrom.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public balanceOf = {
+        async callAsync(
+            _owner: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as TokenContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.balanceOf.call,
+                self.web3ContractInstance,
+            )(
+                _owner,
+            );
+            return result;
+        },
+    };
+    public transfer = {
+        async sendTransactionAsync(
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.transfer.estimateGasAsync.bind(
+                    self,
+                    _to,
+                    _value,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.transfer, self.web3ContractInstance,
+            )(
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.transfer.estimateGas, self.web3ContractInstance,
+            )(
+                _to,
+                _value,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _to: string,
+            _value: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.transfer.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public allowance = {
+        async callAsync(
+            _owner: string,
+            _spender: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<BigNumber
+    > {
+            const self = this as TokenContract;
+            const result = await promisify<BigNumber
+    >(
+                self.web3ContractInstance.allowance.call,
+                self.web3ContractInstance,
+            )(
+                _owner,
+                _spender,
+            );
+            return result;
+        },
+    };
+    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
+        super(web3ContractInstance, defaults);
+        classUtils.bindAll(this, ['web3ContractInstance', 'defaults']);
+    }
+} // tslint:disable:max-file-line-count
diff --git a/packages/0x.js/src/contract_wrappers/generated/token_registry.ts b/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
new file mode 100644
index 000000000..6aacc4336
--- /dev/null
+++ b/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
@@ -0,0 +1,550 @@
+/**
+ * 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 {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';
+
+export class TokenRegistryContract extends BaseContract {
+    public removeToken = {
+        async sendTransactionAsync(
+            _token: string,
+            _index: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.removeToken.estimateGasAsync.bind(
+                    self,
+                    _token,
+                    _index,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.removeToken, self.web3ContractInstance,
+            )(
+                _token,
+                _index,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _token: string,
+            _index: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.removeToken.estimateGas, self.web3ContractInstance,
+            )(
+                _token,
+                _index,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _token: string,
+            _index: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenRegistryContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.removeToken.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public getTokenAddressByName = {
+        async callAsync(
+            _name: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.getTokenAddressByName.call,
+                self.web3ContractInstance,
+            )(
+                _name,
+            );
+            return result;
+        },
+    };
+    public getTokenAddressBySymbol = {
+        async callAsync(
+            _symbol: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.getTokenAddressBySymbol.call,
+                self.web3ContractInstance,
+            )(
+                _symbol,
+            );
+            return result;
+        },
+    };
+    public setTokenSwarmHash = {
+        async sendTransactionAsync(
+            _token: string,
+            _swarmHash: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.setTokenSwarmHash.estimateGasAsync.bind(
+                    self,
+                    _token,
+                    _swarmHash,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.setTokenSwarmHash, self.web3ContractInstance,
+            )(
+                _token,
+                _swarmHash,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _token: string,
+            _swarmHash: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.setTokenSwarmHash.estimateGas, self.web3ContractInstance,
+            )(
+                _token,
+                _swarmHash,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _token: string,
+            _swarmHash: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenRegistryContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.setTokenSwarmHash.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public getTokenMetaData = {
+        async callAsync(
+            _token: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<[string, string, string, BigNumber, string, string]
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<[string, string, string, BigNumber, string, string]
+    >(
+                self.web3ContractInstance.getTokenMetaData.call,
+                self.web3ContractInstance,
+            )(
+                _token,
+            );
+            return result;
+        },
+    };
+    public owner = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.owner.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public addToken = {
+        async sendTransactionAsync(
+            _token: string,
+            _name: string,
+            _symbol: string,
+            _decimals: number|BigNumber,
+            _ipfsHash: string,
+            _swarmHash: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.addToken.estimateGasAsync.bind(
+                    self,
+                    _token,
+                    _name,
+                    _symbol,
+                    _decimals,
+                    _ipfsHash,
+                    _swarmHash,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.addToken, self.web3ContractInstance,
+            )(
+                _token,
+                _name,
+                _symbol,
+                _decimals,
+                _ipfsHash,
+                _swarmHash,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _token: string,
+            _name: string,
+            _symbol: string,
+            _decimals: number|BigNumber,
+            _ipfsHash: string,
+            _swarmHash: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.addToken.estimateGas, self.web3ContractInstance,
+            )(
+                _token,
+                _name,
+                _symbol,
+                _decimals,
+                _ipfsHash,
+                _swarmHash,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _token: string,
+            _name: string,
+            _symbol: string,
+            _decimals: number|BigNumber,
+            _ipfsHash: string,
+            _swarmHash: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenRegistryContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.addToken.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public setTokenName = {
+        async sendTransactionAsync(
+            _token: string,
+            _name: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.setTokenName.estimateGasAsync.bind(
+                    self,
+                    _token,
+                    _name,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.setTokenName, self.web3ContractInstance,
+            )(
+                _token,
+                _name,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _token: string,
+            _name: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.setTokenName.estimateGas, self.web3ContractInstance,
+            )(
+                _token,
+                _name,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _token: string,
+            _name: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenRegistryContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.setTokenName.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public tokens = {
+        async callAsync(
+            index: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<[string, string, string, BigNumber, string, string]
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<[string, string, string, BigNumber, string, string]
+    >(
+                self.web3ContractInstance.tokens.call,
+                self.web3ContractInstance,
+            )(
+                index,
+            );
+            return result;
+        },
+    };
+    public tokenAddresses = {
+        async callAsync(
+            index: BigNumber,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.tokenAddresses.call,
+                self.web3ContractInstance,
+            )(
+                index,
+            );
+            return result;
+        },
+    };
+    public getTokenByName = {
+        async callAsync(
+            _name: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<[string, string, string, BigNumber, string, string]
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<[string, string, string, BigNumber, string, string]
+    >(
+                self.web3ContractInstance.getTokenByName.call,
+                self.web3ContractInstance,
+            )(
+                _name,
+            );
+            return result;
+        },
+    };
+    public getTokenAddresses = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string[]
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<string[]
+    >(
+                self.web3ContractInstance.getTokenAddresses.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public setTokenIpfsHash = {
+        async sendTransactionAsync(
+            _token: string,
+            _ipfsHash: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.setTokenIpfsHash.estimateGasAsync.bind(
+                    self,
+                    _token,
+                    _ipfsHash,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.setTokenIpfsHash, self.web3ContractInstance,
+            )(
+                _token,
+                _ipfsHash,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _token: string,
+            _ipfsHash: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.setTokenIpfsHash.estimateGas, self.web3ContractInstance,
+            )(
+                _token,
+                _ipfsHash,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _token: string,
+            _ipfsHash: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenRegistryContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.setTokenIpfsHash.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public getTokenBySymbol = {
+        async callAsync(
+            _symbol: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<[string, string, string, BigNumber, string, string]
+    > {
+            const self = this as TokenRegistryContract;
+            const result = await promisify<[string, string, string, BigNumber, string, string]
+    >(
+                self.web3ContractInstance.getTokenBySymbol.call,
+                self.web3ContractInstance,
+            )(
+                _symbol,
+            );
+            return result;
+        },
+    };
+    public setTokenSymbol = {
+        async sendTransactionAsync(
+            _token: string,
+            _symbol: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.setTokenSymbol.estimateGasAsync.bind(
+                    self,
+                    _token,
+                    _symbol,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.setTokenSymbol, self.web3ContractInstance,
+            )(
+                _token,
+                _symbol,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            _token: string,
+            _symbol: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.setTokenSymbol.estimateGas, self.web3ContractInstance,
+            )(
+                _token,
+                _symbol,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            _token: string,
+            _symbol: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenRegistryContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.setTokenSymbol.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public transferOwnership = {
+        async sendTransactionAsync(
+            newOwner: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.transferOwnership.estimateGasAsync.bind(
+                    self,
+                    newOwner,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.transferOwnership, self.web3ContractInstance,
+            )(
+                newOwner,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            newOwner: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenRegistryContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.transferOwnership.estimateGas, self.web3ContractInstance,
+            )(
+                newOwner,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            newOwner: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenRegistryContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.transferOwnership.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
+        super(web3ContractInstance, defaults);
+        classUtils.bindAll(this, ['web3ContractInstance', 'defaults']);
+    }
+} // tslint:disable:max-file-line-count
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
new file mode 100644
index 000000000..50f1c8f25
--- /dev/null
+++ b/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts
@@ -0,0 +1,285 @@
+/**
+ * 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 {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';
+
+export class TokenTransferProxyContract extends BaseContract {
+    public transferFrom = {
+        async sendTransactionAsync(
+            token: string,
+            from: string,
+            to: string,
+            value: BigNumber,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.transferFrom.estimateGasAsync.bind(
+                    self,
+                    token,
+                    from,
+                    to,
+                    value,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.transferFrom, self.web3ContractInstance,
+            )(
+                token,
+                from,
+                to,
+                value,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            token: string,
+            from: string,
+            to: string,
+            value: BigNumber,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.transferFrom.estimateGas, self.web3ContractInstance,
+            )(
+                token,
+                from,
+                to,
+                value,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            token: string,
+            from: string,
+            to: string,
+            value: BigNumber,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenTransferProxyContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.transferFrom.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public addAuthorizedAddress = {
+        async sendTransactionAsync(
+            target: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.addAuthorizedAddress.estimateGasAsync.bind(
+                    self,
+                    target,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.addAuthorizedAddress, self.web3ContractInstance,
+            )(
+                target,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            target: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.addAuthorizedAddress.estimateGas, self.web3ContractInstance,
+            )(
+                target,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            target: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenTransferProxyContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.addAuthorizedAddress.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public authorities = {
+        async callAsync(
+            index: BigNumber,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as TokenTransferProxyContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.authorities.call,
+                self.web3ContractInstance,
+            )(
+                index,
+            );
+            return result;
+        },
+    };
+    public removeAuthorizedAddress = {
+        async sendTransactionAsync(
+            target: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.removeAuthorizedAddress.estimateGasAsync.bind(
+                    self,
+                    target,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.removeAuthorizedAddress, self.web3ContractInstance,
+            )(
+                target,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            target: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.removeAuthorizedAddress.estimateGas, self.web3ContractInstance,
+            )(
+                target,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            target: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenTransferProxyContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.removeAuthorizedAddress.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    public owner = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string
+    > {
+            const self = this as TokenTransferProxyContract;
+            const result = await promisify<string
+    >(
+                self.web3ContractInstance.owner.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public authorized = {
+        async callAsync(
+            index: string,
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<boolean
+    > {
+            const self = this as TokenTransferProxyContract;
+            const result = await promisify<boolean
+    >(
+                self.web3ContractInstance.authorized.call,
+                self.web3ContractInstance,
+            )(
+                index,
+            );
+            return result;
+        },
+    };
+    public getAuthorizedAddresses = {
+        async callAsync(
+            defaultBlock?: Web3.BlockParam,
+        ): Promise<string[]
+    > {
+            const self = this as TokenTransferProxyContract;
+            const result = await promisify<string[]
+    >(
+                self.web3ContractInstance.getAuthorizedAddresses.call,
+                self.web3ContractInstance,
+            )(
+            );
+            return result;
+        },
+    };
+    public transferOwnership = {
+        async sendTransactionAsync(
+            newOwner: string,
+            txData: TxData = {},
+        ): Promise<string> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+                self.transferOwnership.estimateGasAsync.bind(
+                    self,
+                    newOwner,
+                ),
+            );
+            const txHash = await promisify<string>(
+                self.web3ContractInstance.transferOwnership, self.web3ContractInstance,
+            )(
+                newOwner,
+                txDataWithDefaults,
+            );
+            return txHash;
+        },
+        async estimateGasAsync(
+            newOwner: string,
+            txData: TxData = {},
+        ): Promise<number> {
+            const self = this as TokenTransferProxyContract;
+            const txDataWithDefaults = await self.applyDefaultsToTxDataAsync(
+                txData,
+            );
+            const gas = await promisify<number>(
+                self.web3ContractInstance.transferOwnership.estimateGas, self.web3ContractInstance,
+            )(
+                newOwner,
+                txDataWithDefaults,
+            );
+            return gas;
+        },
+        getABIEncodedTransactionData(
+            newOwner: string,
+            txData: TxData = {},
+        ): string {
+            const self = this as TokenTransferProxyContract;
+            const abiEncodedTransactionData = self.web3ContractInstance.transferOwnership.getData();
+            return abiEncodedTransactionData;
+        },
+    };
+    constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<TxData>) {
+        super(web3ContractInstance, defaults);
+        classUtils.bindAll(this, ['web3ContractInstance', 'defaults']);
+    }
+} // tslint:disable:max-file-line-count
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 35337fa35..27ecb8bde 100644
--- a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
@@ -1,12 +1,13 @@
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
-import {Token, TokenMetadata, TokenRegistryContract, ZeroExError} from '../types';
+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';
 
 /**
  * This class includes all the functionality related to interacting with the 0x Token Registry smart contract.
@@ -116,9 +117,12 @@ export class TokenRegistryWrapper extends ContractWrapper {
         if (!_.isUndefined(this._tokenRegistryContractIfExists)) {
             return this._tokenRegistryContractIfExists;
         }
-        const contractInstance = await this._instantiateContractIfExistsAsync<TokenRegistryContract>(
+        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
             artifacts.TokenRegistryArtifact, this._contractAddressIfExists,
         );
+        const contractInstance = new TokenRegistryContract(
+            web3ContractInstance, this._web3Wrapper.getContractDefaults(),
+        );
         this._tokenRegistryContractIfExists = contractInstance;
         return this._tokenRegistryContractIfExists;
     }
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 c3df7d3eb..edc702672 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
@@ -1,10 +1,11 @@
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
-import {TokenTransferProxyContract, ZeroExError} from '../types';
+import {ZeroExError} from '../types';
 import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
+import {TokenTransferProxyContract} from './generated/token_transfer_proxy';
 
 /**
  * This class includes the functionality related to interacting with the TokenTransferProxy contract.
@@ -53,9 +54,12 @@ export class TokenTransferProxyWrapper extends ContractWrapper {
         if (!_.isUndefined(this._tokenTransferProxyContractIfExists)) {
             return this._tokenTransferProxyContractIfExists;
         }
-        const contractInstance = await this._instantiateContractIfExistsAsync<TokenTransferProxyContract>(
+        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
             artifacts.TokenTransferProxyArtifact, this._contractAddressIfExists,
         );
+        const contractInstance = new TokenTransferProxyContract(
+            web3ContractInstance, this._web3Wrapper.getContractDefaults(),
+        );
         this._tokenTransferProxyContractIfExists = contractInstance;
         return this._tokenTransferProxyContractIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index 4a1dfcf8d..630ab6e3b 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -9,7 +9,6 @@ import {
     LogWithDecodedArgs,
     MethodOpts,
     SubscriptionOpts,
-    TokenContract,
     TokenContractEventArgs,
     TokenEvents,
     TransactionOpts,
@@ -21,6 +20,7 @@ import {constants} from '../utils/constants';
 import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
+import {TokenContract} from './generated/token';
 import {TokenTransferProxyWrapper} from './token_transfer_proxy_wrapper';
 
 const ALLOWANCE_TO_ZERO_GAS_AMOUNT = 47275;
@@ -313,9 +313,12 @@ export class TokenWrapper extends ContractWrapper {
         if (!_.isUndefined(tokenContract)) {
             return tokenContract;
         }
-        const contractInstance = await this._instantiateContractIfExistsAsync<TokenContract>(
+        const web3ContractInstance = await this._instantiateContractIfExistsAsync(
             artifacts.TokenArtifact, tokenAddress,
         );
+        const contractInstance = new TokenContract(
+            web3ContractInstance, this._web3Wrapper.getContractDefaults(),
+        );
         tokenContract = contractInstance;
         this._tokenContractsByAddress[tokenAddress] = tokenContract;
         return tokenContract;
diff --git a/packages/0x.js/src/globals.d.ts b/packages/0x.js/src/globals.d.ts
index cb3800056..4fa1cfd9c 100644
--- a/packages/0x.js/src/globals.d.ts
+++ b/packages/0x.js/src/globals.d.ts
@@ -39,12 +39,6 @@ declare module 'compare-versions' {
     export = compareVersions;
 }
 
-// es6-promisify declarations
-declare function promisify(original: any, settings?: any): ((...arg: any[]) => Promise<any>);
-declare module 'es6-promisify' {
-    export = promisify;
-}
-
 declare module 'ethereumjs-abi' {
     const soliditySHA3: (argTypes: string[], args: any[]) => Buffer;
 }
diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index 5363b02ff..3586919cb 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -52,156 +52,6 @@ export interface DecodedLogEvent<ArgsType> {
 export type EventCallback<ArgsType> = (err: null|Error, log?: DecodedLogEvent<ArgsType>) => void;
 export type EventWatcherCallback = (log: LogEvent) => void;
 
-export interface ExchangeContract extends Web3.ContractInstance {
-    isValidSignature: {
-        callAsync: (signerAddressHex: string, dataHex: string, v: number, r: string, s: string,
-                    txOpts?: TxOpts) => Promise<boolean>;
-    };
-    ZRX_TOKEN_CONTRACT: {
-        callAsync: () => Promise<string>;
-    };
-    TOKEN_TRANSFER_PROXY_CONTRACT: {
-        callAsync: () => Promise<string>;
-    };
-    getUnavailableTakerTokenAmount: {
-        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
-    };
-    isRoundingError: {
-        callAsync: (takerTokenFillAmount: BigNumber, takerTokenAmount: BigNumber,
-                    makerTokenAmount: BigNumber, txOpts?: TxOpts) => Promise<boolean>;
-    };
-    fillOrder: {
-        sendTransactionAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                               fillTakerTokenAmount: BigNumber,
-                               shouldThrowOnInsufficientBalanceOrAllowance: boolean,
-                               v: number, r: string, s: string, txOpts?: TxOpts) => Promise<string>;
-        estimateGasAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                           fillTakerTokenAmount: BigNumber,
-                           shouldThrowOnInsufficientBalanceOrAllowance: boolean,
-                           v: number, r: string, s: string, txOpts?: TxOpts) => Promise<number>;
-    };
-    batchFillOrders: {
-        sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               fillTakerTokenAmounts: BigNumber[],
-                               shouldThrowOnInsufficientBalanceOrAllowance: boolean,
-                               v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<string>;
-        estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           fillTakerTokenAmounts: BigNumber[],
-                           shouldThrowOnInsufficientBalanceOrAllowance: boolean,
-                           v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<number>;
-    };
-    fillOrdersUpTo: {
-        sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               fillTakerTokenAmount: BigNumber,
-                               shouldThrowOnInsufficientBalanceOrAllowance: boolean,
-                               v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<string>;
-        estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           fillTakerTokenAmount: BigNumber,
-                           shouldThrowOnInsufficientBalanceOrAllowance: boolean,
-                           v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<number>;
-    };
-    cancelOrder: {
-        sendTransactionAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                               cancelTakerTokenAmount: BigNumber, txOpts?: TxOpts) => Promise<string>;
-        estimateGasAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                           cancelTakerTokenAmount: BigNumber,
-                           txOpts?: TxOpts) => Promise<number>;
-    };
-    batchCancelOrders: {
-        sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               cancelTakerTokenAmounts: BigNumber[], txOpts?: TxOpts) => Promise<string>;
-        estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           cancelTakerTokenAmounts: BigNumber[],
-                           txOpts?: TxOpts) => Promise<number>;
-    };
-    fillOrKillOrder: {
-        sendTransactionAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                               fillTakerTokenAmount: BigNumber,
-                               v: number, r: string, s: string, txOpts?: TxOpts) => Promise<string>;
-        estimateGasAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                           fillTakerTokenAmount: BigNumber,
-                           v: number, r: string, s: string, txOpts?: TxOpts) => Promise<number>;
-    };
-    batchFillOrKillOrders: {
-        sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               fillTakerTokenAmounts: BigNumber[],
-                               v: number[], r: string[], s: string[], txOpts: TxOpts) => Promise<string>;
-        estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           fillTakerTokenAmounts: BigNumber[],
-                           v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<number>;
-    };
-    filled: {
-        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
-    };
-    cancelled: {
-        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
-    };
-    getOrderHash: {
-        callAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues) => Promise<string>;
-    };
-}
-
-export interface TokenContract extends Web3.ContractInstance {
-    balanceOf: {
-        callAsync: (address: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
-    };
-    allowance: {
-        callAsync: (ownerAddress: string, allowedAddress: string,
-                    defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
-    };
-    transfer: {
-        sendTransactionAsync: (toAddress: string, amountInBaseUnits: BigNumber,
-                               txOpts?: TxOpts) => Promise<string>;
-    };
-    transferFrom: {
-        sendTransactionAsync: (fromAddress: string, toAddress: string, amountInBaseUnits: BigNumber,
-                               txOpts?: TxOpts) => Promise<string>;
-    };
-    approve: {
-        sendTransactionAsync: (proxyAddress: string, amountInBaseUnits: BigNumber,
-                               txOpts?: TxOpts) => Promise<string>;
-    };
-}
-
-export interface TokenRegistryContract extends Web3.ContractInstance {
-    getTokenMetaData: {
-        callAsync: (address: string) => Promise<TokenMetadata>;
-    };
-    getTokenAddresses: {
-        callAsync: () => Promise<string[]>;
-    };
-    getTokenAddressBySymbol: {
-        callAsync: (symbol: string) => Promise<string>;
-    };
-    getTokenAddressByName: {
-        callAsync: (name: string) => Promise<string>;
-    };
-    getTokenBySymbol: {
-        callAsync: (symbol: string) => Promise<TokenMetadata>;
-    };
-    getTokenByName: {
-        callAsync: (name: string) => Promise<TokenMetadata>;
-    };
-}
-
-export interface EtherTokenContract extends Web3.ContractInstance {
-    deposit: {
-        sendTransactionAsync: (txOpts: TxOpts) => Promise<string>;
-    };
-    withdraw: {
-        sendTransactionAsync: (amount: BigNumber, txOpts: TxOpts) => Promise<string>;
-    };
-}
-
-export interface TokenTransferProxyContract extends Web3.ContractInstance {
-    getAuthorizedAddresses: {
-        callAsync: () => Promise<string[]>;
-    };
-    authorized: {
-        callAsync: (address: string) => Promise<boolean>;
-    };
-}
-
 export enum SolidityTypes {
     Address = 'address',
     Uint256 = 'uint256',
@@ -393,10 +243,6 @@ export type AsyncMethod = (...args: any[]) => Promise<any>;
  */
 export type Web3Provider = Web3.Provider;
 
-export interface ExchangeContractByAddress {
-    [address: string]: ExchangeContract;
-}
-
 export interface JSONRPCPayload {
     params: any[];
     method: string;
@@ -540,6 +386,17 @@ export type OrderState = OrderStateValid|OrderStateInvalid;
 
 export type OnOrderStateChangeCallback = (orderState: OrderState) => void;
 
+export interface TxData {
+    from?: string;
+    gas?: number;
+    gasPrice?: BigNumber;
+    nonce?: number;
+}
+
+export interface TxDataPayable extends TxData {
+    value?: BigNumber;
+}
+
 export interface TransactionReceipt {
     blockHash: string;
     blockNumber: number;
diff --git a/packages/0x.js/src/utils/class_utils.ts b/packages/0x.js/src/utils/class_utils.ts
new file mode 100644
index 000000000..04e60ee57
--- /dev/null
+++ b/packages/0x.js/src/utils/class_utils.ts
@@ -0,0 +1,18 @@
+import * as _ from 'lodash';
+
+export const classUtils = {
+    // This is useful for classes that have nested methods. Nested methods don't get bound out of the box.
+    bindAll(self: any, exclude: string[] = ['contructor'], thisArg?: any): void {
+        for (const key of Object.getOwnPropertyNames(self)) {
+            const val = self[key];
+            if (!_.includes(exclude, key)) {
+                if (_.isFunction(val)) {
+                    self[key] = val.bind(thisArg || self);
+                } else if (_.isObject(val)) {
+                    classUtils.bindAll(val, exclude, self);
+                }
+            }
+        }
+        return self;
+    },
+};
diff --git a/packages/0x.js/src/utils/promisify.ts b/packages/0x.js/src/utils/promisify.ts
new file mode 100644
index 000000000..c114cf32f
--- /dev/null
+++ b/packages/0x.js/src/utils/promisify.ts
@@ -0,0 +1,24 @@
+import * as _ from 'lodash';
+
+/**
+ * Transforms callback-based function -- func(arg1, arg2 .. argN, callback) -- into an ES6-compatible Promise.
+ * Promisify provides a default callback of the form (error, result) and rejects when `error` is not null. You can also
+ * supply thisArg object as the second argument which will be passed to `apply`.
+ */
+export function promisify<T>(
+    originalFn: (
+        ...args: any[],
+        // HACK: This can't be properly typed without variadic kinds https://github.com/Microsoft/TypeScript/issues/5453
+    ) => void,
+    thisArg?: any,
+): (...callArgs: any[]) => Promise<T> {
+    const promisifiedFunction = async (...callArgs: any[]): Promise<T> => {
+        return new Promise<T>((resolve, reject) => {
+            const callback = (err: Error|null, data?: T) => {
+                _.isNull(err) ? resolve(data) : reject(err);
+            };
+            originalFn.apply(thisArg, [...callArgs, callback]);
+        });
+    };
+    return promisifiedFunction;
+}
diff --git a/packages/0x.js/src/web3_wrapper.ts b/packages/0x.js/src/web3_wrapper.ts
index a031de486..6a6b4e760 100644
--- a/packages/0x.js/src/web3_wrapper.ts
+++ b/packages/0x.js/src/web3_wrapper.ts
@@ -1,10 +1,9 @@
 import BigNumber from 'bignumber.js';
-import promisify = require('es6-promisify');
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
-import {Contract} from './contract';
-import {Artifact, ArtifactContractName, TransactionReceipt, ZeroExError} from './types';
+import {Artifact, ArtifactContractName, TransactionReceipt, TxData, ZeroExError} from './types';
+import {promisify} from './utils/promisify';
 
 interface RawLogEntry {
     logIndex: string|null;
@@ -29,9 +28,9 @@ const CONTRACT_NAME_TO_NOT_FOUND_ERROR: {[contractName: string]: ZeroExError} =
 export class Web3Wrapper {
     private web3: Web3;
     private networkId: number;
-    private defaults: Partial<Web3.TxData>;
+    private defaults: Partial<TxData>;
     private jsonRpcRequestId: number;
-    constructor(provider: Web3.Provider, networkId: number, defaults?: Partial<Web3.TxData>) {
+    constructor(provider: Web3.Provider, networkId: number, 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`
@@ -44,6 +43,9 @@ export class Web3Wrapper {
         this.defaults = defaults || {};
         this.jsonRpcRequestId = 0;
     }
+    public getContractDefaults(): Partial<TxData> {
+        return this.defaults;
+    }
     public setProvider(provider: Web3.Provider, networkId: number) {
         this.networkId = networkId;
         this.web3.setProvider(provider);
@@ -56,11 +58,11 @@ export class Web3Wrapper {
         return _.includes(addresses, senderAddress);
     }
     public async getNodeVersionAsync(): Promise<string> {
-        const nodeVersion = await promisify(this.web3.version.getNode)();
+        const nodeVersion = await promisify<string>(this.web3.version.getNode)();
         return nodeVersion;
     }
     public async getTransactionReceiptAsync(txHash: string): Promise<TransactionReceipt> {
-        const transactionReceipt = await promisify(this.web3.eth.getTransactionReceipt)(txHash);
+        const transactionReceipt = await promisify<TransactionReceipt>(this.web3.eth.getTransactionReceipt)(txHash);
         if (!_.isNull(transactionReceipt)) {
             transactionReceipt.status = this.normalizeTxReceiptStatus(transactionReceipt.status);
         }
@@ -72,8 +74,9 @@ export class Web3Wrapper {
     public getNetworkId(): number {
         return this.networkId;
     }
-    public async getContractInstanceFromArtifactAsync<A extends Web3.ContractInstance>(artifact: Artifact,
-                                                                                       address?: string): Promise<A> {
+    public async getContractInstanceFromArtifactAsync(
+        artifact: Artifact, address?: string,
+    ): Promise<Web3.ContractInstance> {
         let contractAddress: string;
         if (_.isUndefined(address)) {
             const networkId = this.getNetworkId();
@@ -88,7 +91,7 @@ export class Web3Wrapper {
         if (!doesContractExist) {
             throw new Error(CONTRACT_NAME_TO_NOT_FOUND_ERROR[artifact.contract_name]);
         }
-        const contractInstance = this.getContractInstance<A>(
+        const contractInstance = this.getContractInstance(
             artifact.abi, contractAddress,
         );
         return contractInstance;
@@ -98,26 +101,26 @@ export class Web3Wrapper {
         return balanceWei;
     }
     public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
-        let balanceInWei = await promisify(this.web3.eth.getBalance)(owner);
+        let balanceInWei = await promisify<BigNumber>(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);
+        const code = await promisify<string>(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);
+        const signData = await promisify<string>(this.web3.eth.sign)(address, message);
         return signData;
     }
     public async getBlockNumberAsync(): Promise<number> {
-        const blockNumber = await promisify(this.web3.eth.getBlockNumber)();
+        const blockNumber = await promisify<number>(this.web3.eth.getBlockNumber)();
         return blockNumber;
     }
     public async getBlockAsync(blockParam: string|Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
-        const block = await promisify(this.web3.eth.getBlock)(blockParam);
+        const block = await promisify<Web3.BlockWithoutTransactionData>(this.web3.eth.getBlock)(blockParam);
         return block;
     }
     public async getBlockTimestampAsync(blockParam: string|Web3.BlockParam): Promise<number> {
@@ -125,7 +128,7 @@ export class Web3Wrapper {
         return timestamp;
     }
     public async getAvailableAddressesAsync(): Promise<string[]> {
-        const addresses: string[] = await promisify(this.web3.eth.getAccounts)();
+        const addresses = await promisify<string[]>(this.web3.eth.getAccounts)();
         return addresses;
     }
     public async getLogsAsync(filter: Web3.FilterObject): Promise<Web3.LogEntry[]> {
@@ -152,18 +155,17 @@ export class Web3Wrapper {
         const formattedLogs = _.map(rawLogs, this.formatLog.bind(this));
         return formattedLogs;
     }
-    private getContractInstance<A extends Web3.ContractInstance>(abi: Web3.ContractAbi, address: string): A {
+    private getContractInstance(abi: Web3.ContractAbi, address: string): Web3.ContractInstance {
         const web3ContractInstance = this.web3.eth.contract(abi).at(address);
-        const contractInstance = new Contract(web3ContractInstance, this.defaults) as any as A;
-        return contractInstance;
+        return web3ContractInstance;
     }
     private async getNetworkAsync(): Promise<number> {
-        const networkId = await promisify(this.web3.version.getNetwork)();
+        const networkId = await promisify<number>(this.web3.version.getNetwork)();
         return networkId;
     }
     private async sendRawPayloadAsync<A>(payload: Web3.JSONRPCRequestPayload): Promise<A> {
         const sendAsync = this.web3.currentProvider.sendAsync.bind(this.web3.currentProvider);
-        const response = await promisify(sendAsync)(payload);
+        const response = await promisify<Web3.JSONRPCResponsePayload>(sendAsync)(payload);
         const result = response.result;
         return result;
     }
diff --git a/packages/0x.js/test/subscription_test.ts b/packages/0x.js/test/subscription_test.ts
index e3b15808b..3aeeaa109 100644
--- a/packages/0x.js/test/subscription_test.ts
+++ b/packages/0x.js/test/subscription_test.ts
@@ -1,6 +1,5 @@
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
-import promisify = require('es6-promisify');
 import * as _ from 'lodash';
 import 'mocha';
 import * as Sinon from 'sinon';
diff --git a/packages/0x.js/test/token_wrapper_test.ts b/packages/0x.js/test/token_wrapper_test.ts
index c853fe0c2..421bd0a8c 100644
--- a/packages/0x.js/test/token_wrapper_test.ts
+++ b/packages/0x.js/test/token_wrapper_test.ts
@@ -1,6 +1,5 @@
 import BigNumber from 'bignumber.js';
 import * as chai from 'chai';
-import promisify = require('es6-promisify');
 import 'mocha';
 import * as Web3 from 'web3';
 
@@ -19,6 +18,8 @@ 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';
@@ -38,12 +39,14 @@ describe('TokenWrapper', () => {
     let tokenUtils: TokenUtils;
     let coinbase: string;
     let addressWithoutFunds: string;
+    let web3Wrapper: Web3Wrapper;
     const config = {
         networkId: constants.TESTRPC_NETWORK_ID,
     };
     before(async () => {
         web3 = web3Factory.create();
         zeroEx = new ZeroEx(web3.currentProvider, config);
+        web3Wrapper = new Web3Wrapper(web3.currentProvider, config.networkId);
         userAddresses = await zeroEx.getAvailableAddressesAsync();
         tokens = await zeroEx.tokenRegistry.getTokensAsync();
         tokenUtils = new TokenUtils(tokens);
@@ -237,8 +240,10 @@ describe('TokenWrapper', () => {
             await zeroEx.token.setAllowanceAsync(zrx.address, coinbase, userWithNormalAllowance, transferAmount);
             await zeroEx.token.setUnlimitedAllowanceAsync(zrx.address, coinbase, userWithUnlimitedAllowance);
 
-            const initBalanceWithNormalAllowance = await promisify(web3.eth.getBalance)(userWithNormalAllowance);
-            const initBalanceWithUnlimitedAllowance = await promisify(web3.eth.getBalance)(userWithUnlimitedAllowance);
+            const initBalanceWithNormalAllowance = await web3Wrapper.getBalanceInWeiAsync(userWithNormalAllowance);
+            const initBalanceWithUnlimitedAllowance = await web3Wrapper.getBalanceInWeiAsync(
+                userWithUnlimitedAllowance,
+            );
 
             await zeroEx.token.transferFromAsync(
                 zrx.address, coinbase, userWithNormalAllowance, userWithNormalAllowance, transferAmount,
@@ -247,8 +252,10 @@ describe('TokenWrapper', () => {
                 zrx.address, coinbase, userWithUnlimitedAllowance, userWithUnlimitedAllowance, transferAmount,
             );
 
-            const finalBalanceWithNormalAllowance = await promisify(web3.eth.getBalance)(userWithNormalAllowance);
-            const finalBalanceWithUnlimitedAllowance = await promisify(web3.eth.getBalance)(userWithUnlimitedAllowance);
+            const finalBalanceWithNormalAllowance = await web3Wrapper.getBalanceInWeiAsync(userWithNormalAllowance);
+            const finalBalanceWithUnlimitedAllowance = await web3Wrapper.getBalanceInWeiAsync(
+                userWithUnlimitedAllowance,
+            );
 
             const normalGasCost = initBalanceWithNormalAllowance.minus(finalBalanceWithNormalAllowance);
             const unlimitedGasCost = initBalanceWithUnlimitedAllowance.minus(finalBalanceWithUnlimitedAllowance);