Merge pull request #277 from 0xProject/feature/weth-events

Add etherToken.getLogsAsync and etherToken.subscribe with tests

18 files changed, 1177 insertions, 304 deletions

diff --git a/packages/0x.js/CHANGELOG.md b/packages/0x.js/CHANGELOG.md
index c69edd88c..f2905ad7e 100644
--- a/packages/0x.js/CHANGELOG.md
+++ b/packages/0x.js/CHANGELOG.md
@@ -6,6 +6,10 @@ v0.x.x - _TBD, 2017_
     * Removed accidentally included `unsubscribeAll` method from `zeroEx.proxy`, `zeroEx.etherToken` and `zeroEx.tokenRegistry` (#267)
     * Removed `etherTokenContractAddress` from `ZeroEx` constructor arg `ZeroExConfig` (#267)
     * Rename `SubscriptionOpts` to `BlockRange` (#272)
+    * Add `zeroEx.etherToken.subscribe`, `zeroEx.etherToken.unsubscribe`, `zeroEx.etherToken.unsubscribeAll` (#277)
+    * Add `zeroEx.etherToken.getLogsAsync` (#277)
+    * Add new public types `BlockParamLiteral`, `EtherTokenEvents`, `EtherTokenContractEventArgs`, `DepositContractEventArgs`, `WithdrawalContractEventArgs` (#277)
+    * Support `Deposit` and `Withdraw` events on etherToken (#277)
     * Improve the error message when taker is not a string (#278)
 
 v0.27.1 - _November 28, 2017_
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index e4965f9a2..7393cc814 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -201,7 +201,7 @@ export class ZeroEx {
             this._web3Wrapper, config.networkId, config.tokenRegistryContractAddress,
         );
         this.etherToken = new EtherTokenWrapper(
-            this._web3Wrapper, config.networkId, this.token,
+            this._web3Wrapper, config.networkId, this._abiDecoder, this.token,
         );
         this.orderStateWatcher = new OrderStateWatcher(
             this._web3Wrapper, this._abiDecoder, this.token, this.exchange, config.orderWatcherConfig,
diff --git a/packages/0x.js/src/artifacts/EtherToken.json b/packages/0x.js/src/artifacts/EtherToken.json
index de6946cf2..1105af3b0 100644
--- a/packages/0x.js/src/artifacts/EtherToken.json
+++ b/packages/0x.js/src/artifacts/EtherToken.json
@@ -231,17 +231,51 @@
       ],
       "name": "Approval",
       "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "name": "_owner",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "name": "_value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Deposit",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "name": "_owner",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "name": "_value",
+          "type": "uint256"
+        }
+      ],
+      "name": "Withdrawal",
+      "type": "event"
     }
   ],
   "networks": {
     "1": {
-      "address": "0x2956356cd2a2bf3202f771f50d3d14a367b48070"
+      "address": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
     },
     "3": {
       "address": "0xc00fd9820cd2898cc4c054b7bf142de637ad129a"
     },
     "42": {
-      "address": "0x05d090b51c40b020eab3bfcb6a2dff130df22e9c"
+      "address": "0x653e49e301e508a13237c0ddc98ae7d4cd2667a1"
     },
     "50": {
       "address": "0x871dd7c2b4b25e1aa18728e9d5f2af4c4e431f5c"
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 a6acbe45d..969f30463 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -1,9 +1,20 @@
+import {schemas} from '@0xproject/json-schemas';
 import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
-import {TransactionOpts, ZeroExError} from '../types';
+import {
+    BlockRange,
+    EtherTokenContractEventArgs,
+    EtherTokenEvents,
+    EventCallback,
+    IndexedFilterValues,
+    LogWithDecodedArgs,
+    TransactionOpts,
+    ZeroExError,
+} from '../types';
+import {AbiDecoder} from '../utils/abi_decoder';
 import {assert} from '../utils/assert';
 
 import {ContractWrapper} from './contract_wrapper';
@@ -15,10 +26,10 @@ import {TokenWrapper} from './token_wrapper';
  * The caller can convert ETH into the equivalent number of wrapped ETH ERC20 tokens and back.
  */
 export class EtherTokenWrapper extends ContractWrapper {
-    private _etherTokenContractIfExists?: EtherTokenContract;
+    private _etherTokenContractsByAddress: {[address: string]: EtherTokenContract} = {};
     private _tokenWrapper: TokenWrapper;
-    constructor(web3Wrapper: Web3Wrapper, networkId: number, tokenWrapper: TokenWrapper) {
-        super(web3Wrapper, networkId);
+    constructor(web3Wrapper: Web3Wrapper, networkId: number, abiDecoder: AbiDecoder, tokenWrapper: TokenWrapper) {
+        super(web3Wrapper, networkId, abiDecoder);
         this._tokenWrapper = tokenWrapper;
     }
     /**
@@ -75,15 +86,76 @@ export class EtherTokenWrapper extends ContractWrapper {
         });
         return txHash;
     }
+    /**
+     * Gets historical logs without creating a subscription
+     * @param   etherTokenAddress   An address of the ether token that emmited the logs.
+     * @param   eventName           The ether token contract event you would like to subscribe to.
+     * @param   blockRange          Block range to get logs from.
+     * @param   indexFilterValues   An object where the keys are indexed args returned by the event and
+     *                              the value is the value you are interested in. E.g `{_owner: aUserAddressHex}`
+     * @return  Array of logs that match the parameters
+     */
+    public async getLogsAsync<ArgsType extends EtherTokenContractEventArgs>(
+        etherTokenAddress: string, eventName: EtherTokenEvents, blockRange: BlockRange,
+        indexFilterValues: IndexedFilterValues): Promise<Array<LogWithDecodedArgs<ArgsType>>> {
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
+        assert.doesBelongToStringEnum('eventName', eventName, EtherTokenEvents);
+        assert.doesConformToSchema('blockRange', blockRange, schemas.blockRangeSchema);
+        assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
+        const logs = await this._getLogsAsync<ArgsType>(
+            etherTokenAddress, eventName, blockRange, indexFilterValues, artifacts.EtherTokenArtifact.abi,
+        );
+        return logs;
+    }
+    /**
+     * Subscribe to an event type emitted by the Token contract.
+     * @param   etherTokenAddress   The hex encoded address where the ether token is deployed.
+     * @param   eventName           The ether token contract event you would like to subscribe to.
+     * @param   indexFilterValues   An object where the keys are indexed args returned by the event and
+     *                              the value is the value you are interested in. E.g `{_owner: aUserAddressHex}`
+     * @param   callback            Callback that gets called when a log is added/removed
+     * @return Subscription token used later to unsubscribe
+     */
+    public subscribe<ArgsType extends EtherTokenContractEventArgs>(
+        etherTokenAddress: string, eventName: EtherTokenEvents, indexFilterValues: IndexedFilterValues,
+        callback: EventCallback<ArgsType>): string {
+        assert.isETHAddressHex('etherTokenAddress', etherTokenAddress);
+        assert.doesBelongToStringEnum('eventName', eventName, EtherTokenEvents);
+        assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
+        assert.isFunction('callback', callback);
+        const subscriptionToken = this._subscribe<ArgsType>(
+            etherTokenAddress, eventName, indexFilterValues, artifacts.EtherTokenArtifact.abi, callback,
+        );
+        return subscriptionToken;
+    }
+    /**
+     * Cancel a subscription
+     * @param   subscriptionToken Subscription token returned by `subscribe()`
+     */
+    public unsubscribe(subscriptionToken: string): void {
+        this._unsubscribe(subscriptionToken);
+    }
+    /**
+     * Cancels all existing subscriptions
+     */
+    public unsubscribeAll(): void {
+        super.unsubscribeAll();
+    }
     private _invalidateContractInstance(): void {
-        delete this._etherTokenContractIfExists;
+        this.unsubscribeAll();
+        this._etherTokenContractsByAddress = {};
     }
     private async _getEtherTokenContractAsync(etherTokenAddress: string): Promise<EtherTokenContract> {
+        let etherTokenContract = this._etherTokenContractsByAddress[etherTokenAddress];
+        if (!_.isUndefined(etherTokenContract)) {
+            return etherTokenContract;
+        }
         const web3ContractInstance = await this._instantiateContractIfExistsAsync(
             artifacts.EtherTokenArtifact, etherTokenAddress,
         );
         const contractInstance = new EtherTokenContract(web3ContractInstance, this._web3Wrapper.getContractDefaults());
-        this._etherTokenContractIfExists = contractInstance;
-        return this._etherTokenContractIfExists;
+        etherTokenContract = contractInstance;
+        this._etherTokenContractsByAddress[etherTokenAddress] = etherTokenContract;
+        return etherTokenContract;
     }
 }
diff --git a/packages/0x.js/src/index.ts b/packages/0x.js/src/index.ts
index b75ca4fa3..da06aad34 100644
--- a/packages/0x.js/src/index.ts
+++ b/packages/0x.js/src/index.ts
@@ -2,6 +2,7 @@ export {ZeroEx} from './0x';
 
 export {
     Order,
+    BlockParamLiteral,
     SignedOrder,
     ECSignature,
     ZeroExError,
@@ -23,10 +24,14 @@ export {
     TransferContractEventArgs,
     ApprovalContractEventArgs,
     TokenContractEventArgs,
+    EtherTokenContractEventArgs,
+    WithdrawalContractEventArgs,
+    DepositContractEventArgs,
     ContractEventArgs,
     ContractEventArg,
     Web3Provider,
     ZeroExConfig,
+    EtherTokenEvents,
     TransactionReceiptWithDecodedLogs,
     LogWithDecodedArgs,
     MethodOpts,
diff --git a/packages/0x.js/src/order_watcher/order_state_watcher.ts b/packages/0x.js/src/order_watcher/order_state_watcher.ts
index c4a9eb1ad..af9814dc8 100644
--- a/packages/0x.js/src/order_watcher/order_state_watcher.ts
+++ b/packages/0x.js/src/order_watcher/order_state_watcher.ts
@@ -12,6 +12,8 @@ import {
     ApprovalContractEventArgs,
     BlockParamLiteral,
     ContractEventArgs,
+    DepositContractEventArgs,
+    EtherTokenEvents,
     ExchangeContractErrs,
     ExchangeEvents,
     LogCancelContractEventArgs,
@@ -24,6 +26,7 @@ import {
     SignedOrder,
     TokenEvents,
     TransferContractEventArgs,
+    WithdrawalContractEventArgs,
     ZeroExError,
 } from '../types';
 import {AbiDecoder} from '../utils/abi_decoder';
@@ -243,6 +246,36 @@ export class OrderStateWatcher {
                 }
                 break;
             }
+            case EtherTokenEvents.Deposit:
+            {
+                // Invalidate cache
+                const args = decodedLog.args as DepositContractEventArgs;
+                this._balanceAndProxyAllowanceLazyStore.deleteBalance(decodedLog.address, args._owner);
+                // Revalidate orders
+                makerToken = decodedLog.address;
+                makerAddress = args._owner;
+                if (!_.isUndefined(this._dependentOrderHashes[makerAddress]) &&
+                    !_.isUndefined(this._dependentOrderHashes[makerAddress][makerToken])) {
+                    const orderHashes = Array.from(this._dependentOrderHashes[makerAddress][makerToken]);
+                    await this._emitRevalidateOrdersAsync(orderHashes);
+                }
+                break;
+            }
+            case EtherTokenEvents.Withdrawal:
+            {
+                // Invalidate cache
+                const args = decodedLog.args as WithdrawalContractEventArgs;
+                this._balanceAndProxyAllowanceLazyStore.deleteBalance(decodedLog.address, args._owner);
+                // Revalidate orders
+                makerToken = decodedLog.address;
+                makerAddress = args._owner;
+                if (!_.isUndefined(this._dependentOrderHashes[makerAddress]) &&
+                    !_.isUndefined(this._dependentOrderHashes[makerAddress][makerToken])) {
+                    const orderHashes = Array.from(this._dependentOrderHashes[makerAddress][makerToken]);
+                    await this._emitRevalidateOrdersAsync(orderHashes);
+                }
+                break;
+            }
             case ExchangeEvents.LogFill:
             {
                 // Invalidate cache
diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index 704e59ce5..e6a2c05d0 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -28,6 +28,7 @@ export enum ZeroExError {
 export enum InternalZeroExError {
     NoAbiDecoder = 'NO_ABI_DECODER',
     ZrxNotInTokenRegistry = 'ZRX_NOT_IN_TOKEN_REGISTRY',
+    WethNotInTokenRegistry = 'WETH_NOT_IN_TOKEN_REGISTRY',
 }
 
 /**
@@ -146,8 +147,17 @@ export interface ApprovalContractEventArgs {
     _spender: string;
     _value: BigNumber;
 }
+export interface DepositContractEventArgs {
+    _owner: string;
+    _value: BigNumber;
+}
+export interface WithdrawalContractEventArgs {
+    _owner: string;
+    _value: BigNumber;
+}
 export type TokenContractEventArgs = TransferContractEventArgs|ApprovalContractEventArgs;
-export type ContractEventArgs = ExchangeContractEventArgs|TokenContractEventArgs;
+export type EtherTokenContractEventArgs = TokenContractEventArgs|DepositContractEventArgs|WithdrawalContractEventArgs;
+export type ContractEventArgs = ExchangeContractEventArgs|TokenContractEventArgs|EtherTokenContractEventArgs;
 export type ContractEventArg = string|BigNumber;
 
 export interface Order {
@@ -201,7 +211,14 @@ export enum TokenEvents {
     Approval = 'Approval',
 }
 
-export type ContractEvents = TokenEvents|ExchangeEvents;
+export enum EtherTokenEvents  {
+    Transfer = 'Transfer',
+    Approval = 'Approval',
+    Deposit = 'Deposit',
+    Withdrawal = 'Withdrawal',
+}
+
+export type ContractEvents = TokenEvents|ExchangeEvents|EtherTokenEvents;
 
 export interface IndexedFilterValues {
     [index: string]: ContractEventArg;
diff --git a/packages/0x.js/test/ether_token_wrapper_test.ts b/packages/0x.js/test/ether_token_wrapper_test.ts
index b5ed19308..4fcb37409 100644
--- a/packages/0x.js/test/ether_token_wrapper_test.ts
+++ b/packages/0x.js/test/ether_token_wrapper_test.ts
@@ -4,11 +4,25 @@ import * as chai from 'chai';
 import 'mocha';
 import * as Web3 from 'web3';
 
-import {ZeroEx, ZeroExError} from '../src';
+import {
+    ApprovalContractEventArgs,
+    BlockParamLiteral,
+    BlockRange,
+    DecodedLogEvent,
+    DepositContractEventArgs,
+    EtherTokenEvents,
+    Token,
+    TransferContractEventArgs,
+    WithdrawalContractEventArgs,
+    ZeroEx,
+    ZeroExError,
+} from '../src';
 import {artifacts} from '../src/artifacts';
+import {DoneCallback} from '../src/types';
 
 import {chaiSetup} from './utils/chai_setup';
 import {constants} from './utils/constants';
+import {TokenUtils} from './utils/token_utils';
 import {web3Factory} from './utils/web3_factory';
 
 chaiSetup.configure();
@@ -24,24 +38,32 @@ const MAX_REASONABLE_GAS_COST_IN_WEI = 62517;
 describe('EtherTokenWrapper', () => {
     let web3: Web3;
     let zeroEx: ZeroEx;
+    let tokens: Token[];
     let userAddresses: string[];
     let addressWithETH: string;
     let wethContractAddress: string;
     let depositWeiAmount: BigNumber;
     let decimalPlaces: number;
+    let addressWithoutFunds: string;
     const gasPrice = new BigNumber(1);
     const zeroExConfig = {
         gasPrice,
         networkId: constants.TESTRPC_NETWORK_ID,
     };
+    const transferAmount = new BigNumber(42);
+    const allowanceAmount = new BigNumber(42);
+    const depositAmount = new BigNumber(42);
+    const withdrawalAmount = new BigNumber(42);
     before(async () => {
         web3 = web3Factory.create();
         zeroEx = new ZeroEx(web3.currentProvider, zeroExConfig);
+        tokens = await zeroEx.tokenRegistry.getTokensAsync();
         userAddresses = await zeroEx.getAvailableAddressesAsync();
         addressWithETH = userAddresses[0];
         wethContractAddress = (zeroEx.etherToken as any)._getContractAddress(artifacts.EtherTokenArtifact);
         depositWeiAmount = (zeroEx as any)._web3Wrapper.toWei(new BigNumber(5));
         decimalPlaces = 7;
+        addressWithoutFunds = userAddresses[1];
     });
     beforeEach(async () => {
         await blockchainLifecycle.startAsync();
@@ -113,4 +135,209 @@ describe('EtherTokenWrapper', () => {
             ).to.be.rejectedWith(ZeroExError.InsufficientWEthBalanceForWithdrawal);
         });
     });
+    describe('#subscribe', () => {
+        const indexFilterValues = {};
+        let etherTokenAddress: string;
+        before(() => {
+            const tokenUtils = new TokenUtils(tokens);
+            const etherToken = tokenUtils.getWethTokenOrThrow();
+            etherTokenAddress = etherToken.address;
+        });
+        afterEach(() => {
+            zeroEx.etherToken.unsubscribeAll();
+        });
+        // Hack: Mocha does not allow a test to be both async and have a `done` callback
+        // Since we need to await the receipt of the event in the `subscribe` callback,
+        // we do need both. A hack is to make the top-level async fn w/ a done callback and then
+        // wrap the rest of the test in an async block
+        // Source: https://github.com/mochajs/mocha/issues/2407
+        it('Should receive the Transfer event when tokens are transfered', (done: DoneCallback) => {
+            (async () => {
+                const callback = (err: Error, logEvent: DecodedLogEvent<TransferContractEventArgs>) => {
+                    expect(err).to.be.null();
+                    expect(logEvent).to.not.be.undefined();
+                    expect(logEvent.isRemoved).to.be.false();
+                    expect(logEvent.log.logIndex).to.be.equal(0);
+                    expect(logEvent.log.transactionIndex).to.be.equal(0);
+                    expect(logEvent.log.blockNumber).to.be.a('number');
+                    const args = logEvent.log.args;
+                    expect(args._from).to.be.equal(addressWithETH);
+                    expect(args._to).to.be.equal(addressWithoutFunds);
+                    expect(args._value).to.be.bignumber.equal(transferAmount);
+                    done();
+                };
+                await zeroEx.etherToken.depositAsync(etherTokenAddress, transferAmount, addressWithETH);
+                zeroEx.etherToken.subscribe(
+                    etherTokenAddress, EtherTokenEvents.Transfer, indexFilterValues, callback);
+                await zeroEx.token.transferAsync(
+                    etherTokenAddress, addressWithETH, addressWithoutFunds, transferAmount,
+                );
+            })().catch(done);
+        });
+        it('Should receive the Approval event when allowance is being set', (done: DoneCallback) => {
+            (async () => {
+                const callback = (err: Error, logEvent: DecodedLogEvent<ApprovalContractEventArgs>) => {
+                    expect(err).to.be.null();
+                    expect(logEvent).to.not.be.undefined();
+                    expect(logEvent.isRemoved).to.be.false();
+                    const args = logEvent.log.args;
+                    expect(args._owner).to.be.equal(addressWithETH);
+                    expect(args._spender).to.be.equal(addressWithoutFunds);
+                    expect(args._value).to.be.bignumber.equal(allowanceAmount);
+                    done();
+                };
+                zeroEx.etherToken.subscribe(
+                    etherTokenAddress, EtherTokenEvents.Approval, indexFilterValues, callback);
+                await zeroEx.token.setAllowanceAsync(
+                    etherTokenAddress, addressWithETH, addressWithoutFunds, allowanceAmount,
+                );
+            })().catch(done);
+        });
+        it('Should receive the Deposit event when ether is being deposited', (done: DoneCallback) => {
+            (async () => {
+                const callback = (err: Error, logEvent: DecodedLogEvent<DepositContractEventArgs>) => {
+                    expect(err).to.be.null();
+                    expect(logEvent).to.not.be.undefined();
+                    expect(logEvent.isRemoved).to.be.false();
+                    const args = logEvent.log.args;
+                    expect(args._owner).to.be.equal(addressWithETH);
+                    expect(args._value).to.be.bignumber.equal(depositAmount);
+                    done();
+                };
+                zeroEx.etherToken.subscribe(
+                    etherTokenAddress, EtherTokenEvents.Deposit, indexFilterValues, callback);
+                await zeroEx.etherToken.depositAsync(
+                    etherTokenAddress, depositAmount, addressWithETH,
+                );
+            })().catch(done);
+        });
+        it('Should receive the Withdrawal event when ether is being withdrawn', (done: DoneCallback) => {
+            (async () => {
+                const callback = (err: Error, logEvent: DecodedLogEvent<WithdrawalContractEventArgs>) => {
+                    expect(err).to.be.null();
+                    expect(logEvent).to.not.be.undefined();
+                    expect(logEvent.isRemoved).to.be.false();
+                    const args = logEvent.log.args;
+                    expect(args._owner).to.be.equal(addressWithETH);
+                    expect(args._value).to.be.bignumber.equal(depositAmount);
+                    done();
+                };
+                await zeroEx.etherToken.depositAsync(
+                    etherTokenAddress, depositAmount, addressWithETH,
+                );
+                zeroEx.etherToken.subscribe(
+                    etherTokenAddress, EtherTokenEvents.Withdrawal, indexFilterValues, callback);
+                await zeroEx.etherToken.withdrawAsync(
+                    etherTokenAddress, withdrawalAmount, addressWithETH,
+                );
+            })().catch(done);
+        });
+        it('should cancel outstanding subscriptions when ZeroEx.setProvider is called', (done: DoneCallback) => {
+            (async () => {
+                const callbackNeverToBeCalled = (err: Error, logEvent: DecodedLogEvent<ApprovalContractEventArgs>) => {
+                    done(new Error('Expected this subscription to have been cancelled'));
+                };
+                zeroEx.etherToken.subscribe(
+                    etherTokenAddress, EtherTokenEvents.Transfer, indexFilterValues, callbackNeverToBeCalled,
+                );
+                const callbackToBeCalled = (err: Error, logEvent: DecodedLogEvent<ApprovalContractEventArgs>) => {
+                    done();
+                };
+                const newProvider = web3Factory.getRpcProvider();
+                zeroEx.setProvider(newProvider, constants.TESTRPC_NETWORK_ID);
+                await zeroEx.etherToken.depositAsync(etherTokenAddress, transferAmount, addressWithETH);
+                zeroEx.etherToken.subscribe(
+                    etherTokenAddress, EtherTokenEvents.Transfer, indexFilterValues, callbackToBeCalled,
+                );
+                await zeroEx.token.transferAsync(
+                    etherTokenAddress, addressWithETH, addressWithoutFunds, transferAmount,
+                );
+            })().catch(done);
+        });
+        it('Should cancel subscription when unsubscribe called', (done: DoneCallback) => {
+            (async () => {
+                const callbackNeverToBeCalled = (err: Error, logEvent: DecodedLogEvent<ApprovalContractEventArgs>) => {
+                    done(new Error('Expected this subscription to have been cancelled'));
+                };
+                await zeroEx.etherToken.depositAsync(etherTokenAddress, transferAmount, addressWithETH);
+                const subscriptionToken = zeroEx.etherToken.subscribe(
+                    etherTokenAddress, EtherTokenEvents.Transfer, indexFilterValues, callbackNeverToBeCalled);
+                zeroEx.etherToken.unsubscribe(subscriptionToken);
+                await zeroEx.token.transferAsync(
+                    etherTokenAddress, addressWithETH, addressWithoutFunds, transferAmount,
+                );
+                done();
+            })().catch(done);
+        });
+    });
+    describe('#getLogsAsync', () => {
+        let etherTokenAddress: string;
+        let tokenTransferProxyAddress: string;
+        const blockRange: BlockRange = {
+            fromBlock: 0,
+            toBlock: BlockParamLiteral.Latest,
+        };
+        let txHash: string;
+        before(() => {
+            addressWithETH = userAddresses[0];
+            const tokenUtils = new TokenUtils(tokens);
+            const etherToken = tokenUtils.getWethTokenOrThrow();
+            etherTokenAddress = etherToken.address;
+            tokenTransferProxyAddress = zeroEx.proxy.getContractAddress();
+        });
+        it('should get logs with decoded args emitted by Approval', async () => {
+            txHash = await zeroEx.token.setUnlimitedProxyAllowanceAsync(etherTokenAddress, addressWithETH);
+            await zeroEx.awaitTransactionMinedAsync(txHash);
+            const eventName = EtherTokenEvents.Approval;
+            const indexFilterValues = {};
+            const logs = await zeroEx.etherToken.getLogsAsync<ApprovalContractEventArgs>(
+                etherTokenAddress, eventName, blockRange, indexFilterValues,
+            );
+            expect(logs).to.have.length(1);
+            const args = logs[0].args;
+            expect(logs[0].event).to.be.equal(eventName);
+            expect(args._owner).to.be.equal(addressWithETH);
+            expect(args._spender).to.be.equal(tokenTransferProxyAddress);
+            expect(args._value).to.be.bignumber.equal(zeroEx.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS);
+        });
+        it('should get logs with decoded args emitted by Deposit', async () => {
+            await zeroEx.etherToken.depositAsync(etherTokenAddress, depositAmount, addressWithETH);
+            const eventName = EtherTokenEvents.Deposit;
+            const indexFilterValues = {};
+            const logs = await zeroEx.etherToken.getLogsAsync<DepositContractEventArgs>(
+                etherTokenAddress, eventName, blockRange, indexFilterValues,
+            );
+            expect(logs).to.have.length(1);
+            const args = logs[0].args;
+            expect(logs[0].event).to.be.equal(eventName);
+            expect(args._owner).to.be.equal(addressWithETH);
+            expect(args._value).to.be.bignumber.equal(depositAmount);
+        });
+        it('should only get the logs with the correct event name', async () => {
+            txHash = await zeroEx.token.setUnlimitedProxyAllowanceAsync(etherTokenAddress, addressWithETH);
+            await zeroEx.awaitTransactionMinedAsync(txHash);
+            const differentEventName = EtherTokenEvents.Transfer;
+            const indexFilterValues = {};
+            const logs = await zeroEx.etherToken.getLogsAsync(
+                etherTokenAddress, differentEventName, blockRange, indexFilterValues,
+            );
+            expect(logs).to.have.length(0);
+        });
+        it('should only get the logs with the correct indexed fields', async () => {
+            txHash = await zeroEx.token.setUnlimitedProxyAllowanceAsync(etherTokenAddress, addressWithETH);
+            await zeroEx.awaitTransactionMinedAsync(txHash);
+            txHash = await zeroEx.token.setUnlimitedProxyAllowanceAsync(etherTokenAddress, addressWithoutFunds);
+            await zeroEx.awaitTransactionMinedAsync(txHash);
+            const eventName = EtherTokenEvents.Approval;
+            const indexFilterValues = {
+                _owner: addressWithETH,
+            };
+            const logs = await zeroEx.etherToken.getLogsAsync<ApprovalContractEventArgs>(
+                etherTokenAddress, eventName, blockRange, indexFilterValues,
+            );
+            expect(logs).to.have.length(1);
+            const args = logs[0].args;
+            expect(args._owner).to.be.equal(addressWithETH);
+        });
+    });
 });
diff --git a/packages/0x.js/test/token_wrapper_test.ts b/packages/0x.js/test/token_wrapper_test.ts
index 48742b663..a43cef675 100644
--- a/packages/0x.js/test/token_wrapper_test.ts
+++ b/packages/0x.js/test/token_wrapper_test.ts
@@ -7,6 +7,7 @@ import * as Web3 from 'web3';
 
 import {
     ApprovalContractEventArgs,
+    BlockParamLiteral,
     BlockRange,
     DecodedLogEvent,
     Token,
@@ -15,7 +16,7 @@ import {
     ZeroEx,
     ZeroExError,
 } from '../src';
-import {BlockParamLiteral, DoneCallback} from '../src/types';
+import {DoneCallback} from '../src/types';
 
 import {chaiSetup} from './utils/chai_setup';
 import {constants} from './utils/constants';
diff --git a/packages/0x.js/test/utils/token_utils.ts b/packages/0x.js/test/utils/token_utils.ts
index 4634899a7..7da7f466c 100644
--- a/packages/0x.js/test/utils/token_utils.ts
+++ b/packages/0x.js/test/utils/token_utils.ts
@@ -17,6 +17,13 @@ export class TokenUtils {
         }
         return zrxToken;
     }
+    public getWethTokenOrThrow(): Token {
+        const wethToken = _.find(this.tokens, {symbol: WETH_TOKEN_SYMBOL});
+        if (_.isUndefined(wethToken)) {
+            throw new Error(InternalZeroExError.WethNotInTokenRegistry);
+        }
+        return wethToken;
+    }
     public getDummyTokens(): Token[] {
         const dummyTokens = _.filter(this.tokens, token => {
             return !_.includes([PROTOCOL_TOKEN_SYMBOL, WETH_TOKEN_SYMBOL], token.symbol);
diff --git a/packages/contracts/contracts/tokens/EtherToken.sol b/packages/contracts/contracts/tokens/EtherToken.sol
deleted file mode 100644
index 2eae012fc..000000000
--- a/packages/contracts/contracts/tokens/EtherToken.sol
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
-
-  Copyright 2017 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity ^0.4.11;
-
-import "./UnlimitedAllowanceToken.sol";
-import "./../utils/SafeMath.sol";
-
-contract EtherToken is UnlimitedAllowanceToken, SafeMath {
-
-    string constant public name = "Ether Token";
-    string constant public symbol = "WETH";
-    uint8 constant public decimals = 18;
-
-    /// @dev Fallback to calling deposit when ether is sent directly to contract.
-    function()
-        public
-        payable
-    {
-        deposit();
-    }
-
-    /// @dev Buys tokens with Ether, exchanging them 1:1.
-    function deposit()
-        public
-        payable
-    {
-        balances[msg.sender] = safeAdd(balances[msg.sender], msg.value);
-        totalSupply = safeAdd(totalSupply, msg.value);
-    }
-
-    /// @dev Sells tokens in exchange for Ether, exchanging them 1:1.
-    /// @param amount Number of tokens to sell.
-    function withdraw(uint amount)
-        public
-    {
-        balances[msg.sender] = safeSub(balances[msg.sender], amount);
-        totalSupply = safeSub(totalSupply, amount);
-        require(msg.sender.send(amount));
-    }
-}
-
diff --git a/packages/contracts/contracts/tokens/EtherToken_v2.sol b/packages/contracts/contracts/tokens/EtherToken_v2.sol
deleted file mode 100644
index f172c8e35..000000000
--- a/packages/contracts/contracts/tokens/EtherToken_v2.sol
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
-
-  Copyright 2017 ZeroEx Intl.
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-
-*/
-
-pragma solidity 0.4.18;
-
-import "./UnlimitedAllowanceToken_v2.sol";
-import "./../utils/SafeMath_v2.sol";
-
-contract EtherToken_v2 is UnlimitedAllowanceToken_v2, SafeMath_v2 {
-
-    string constant public name = "Ether Token";
-    string constant public symbol = "WETH";
-    string constant public version = "2.0.0"; // version 1.0.0 deployed on mainnet at 0x2956356cd2a2bf3202f771f50d3d14a367b48070
-    uint8 constant public decimals = 18;
-
-    /// @dev Fallback to calling deposit when ether is sent directly to contract.
-    function()
-        public
-        payable
-    {
-        deposit();
-    }
-
-    /// @dev Buys tokens with Ether, exchanging them 1:1.
-    function deposit()
-        public
-        payable
-    {
-        balances[msg.sender] = safeAdd(balances[msg.sender], msg.value);
-        totalSupply = safeAdd(totalSupply, msg.value);
-        Transfer(address(0), msg.sender, msg.value);
-    }
-
-    /// @dev Sells tokens in exchange for Ether, exchanging them 1:1.
-    /// @param _value Number of tokens to sell.
-    function withdraw(uint _value)
-        public
-    {
-        balances[msg.sender] = safeSub(balances[msg.sender], _value);
-        totalSupply = safeSub(totalSupply, _value);
-        require(msg.sender.send(_value));
-        Transfer(msg.sender, address(0), _value);
-    }
-}
-
diff --git a/packages/contracts/contracts/tokens/WETH9.sol b/packages/contracts/contracts/tokens/WETH9.sol
new file mode 100644
index 000000000..733ca414b
--- /dev/null
+++ b/packages/contracts/contracts/tokens/WETH9.sol
@@ -0,0 +1,756 @@
+// Copyright (C) 2015, 2016, 2017 Dapphub
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity ^0.4.18;
+
+contract WETH9 {
+    string public name     = "Wrapped Ether";
+    string public symbol   = "WETH";
+    uint8  public decimals = 18;
+
+    event  Approval(address indexed src, address indexed guy, uint wad);
+    event  Transfer(address indexed src, address indexed dst, uint wad);
+    event  Deposit(address indexed dst, uint wad);
+    event  Withdrawal(address indexed src, uint wad);
+
+    mapping (address => uint)                       public  balanceOf;
+    mapping (address => mapping (address => uint))  public  allowance;
+
+    function() public payable {
+        deposit();
+    }
+    function deposit() public payable {
+        balanceOf[msg.sender] += msg.value;
+        Deposit(msg.sender, msg.value);
+    }
+    function withdraw(uint wad) public {
+        require(balanceOf[msg.sender] >= wad);
+        balanceOf[msg.sender] -= wad;
+        msg.sender.transfer(wad);
+        Withdrawal(msg.sender, wad);
+    }
+
+    function totalSupply() public view returns (uint) {
+        return this.balance;
+    }
+
+    function approve(address guy, uint wad) public returns (bool) {
+        allowance[msg.sender][guy] = wad;
+        Approval(msg.sender, guy, wad);
+        return true;
+    }
+
+    function transfer(address dst, uint wad) public returns (bool) {
+        return transferFrom(msg.sender, dst, wad);
+    }
+
+    function transferFrom(address src, address dst, uint wad)
+        public
+        returns (bool)
+    {
+        require(balanceOf[src] >= wad);
+
+        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
+            require(allowance[src][msg.sender] >= wad);
+            allowance[src][msg.sender] -= wad;
+        }
+
+        balanceOf[src] -= wad;
+        balanceOf[dst] += wad;
+
+        Transfer(src, dst, wad);
+
+        return true;
+    }
+}
+
+
+/*
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+
+  12. No Surrender of Others' Freedom.
+
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+SUCH DAMAGES.
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+  17. Interpretation of Sections 15 and 16.
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
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+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
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+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
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+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+
+*/
diff --git a/packages/contracts/deploy/migrations/migrate.ts b/packages/contracts/deploy/migrations/migrate.ts
index e893e6a6f..d21d48a82 100644
--- a/packages/contracts/deploy/migrations/migrate.ts
+++ b/packages/contracts/deploy/migrations/migrate.ts
@@ -19,7 +19,7 @@ export const migrator = {
 
         const tokenTransferProxy = await deployer.deployAndSaveAsync('TokenTransferProxy');
         const zrxToken = await deployer.deployAndSaveAsync('ZRXToken');
-        const etherToken = await deployer.deployAndSaveAsync('EtherToken');
+        const etherToken = await deployer.deployAndSaveAsync('WETH9');
         const tokenReg = await deployer.deployAndSaveAsync('TokenRegistry');
 
         const exchangeArgs = [zrxToken.address, tokenTransferProxy.address];
diff --git a/packages/contracts/migrations/2_deploy_independent_contracts.ts b/packages/contracts/migrations/2_deploy_independent_contracts.ts
index 4bf316be6..b465db7db 100644
--- a/packages/contracts/migrations/2_deploy_independent_contracts.ts
+++ b/packages/contracts/migrations/2_deploy_independent_contracts.ts
@@ -4,7 +4,6 @@ const {
     MultiSigWalletWithTimeLock,
     TokenTransferProxy,
     EtherToken,
-    EtherTokenV2,
     TokenRegistry,
 } = new Artifacts(artifacts);
 
@@ -34,8 +33,6 @@ module.exports = (deployer: any, network: string, accounts: string[]) => {
                 return deployer.deploy(TokenRegistry);
             }).then(() => {
                 return deployer.deploy(EtherToken);
-            }).then(() => {
-                return deployer.deploy(EtherTokenV2);
             });
     } else {
         deployer.deploy([
diff --git a/packages/contracts/test/ts/ether_token_v2.ts b/packages/contracts/test/ts/ether_token_v2.ts
deleted file mode 100644
index 480c4035b..000000000
--- a/packages/contracts/test/ts/ether_token_v2.ts
+++ /dev/null
@@ -1,166 +0,0 @@
-import {ZeroEx, ZeroExError} from '0x.js';
-import {promisify} from '@0xproject/utils';
-import {BigNumber} from 'bignumber.js';
-import * as chai from 'chai';
-import Web3 = require('web3');
-
-import {Artifacts} from '../../util/artifacts';
-import {constants} from '../../util/constants';
-
-import {chaiSetup} from './utils/chai_setup';
-
-const {EtherTokenV2} = new Artifacts(artifacts);
-
-chaiSetup.configure();
-const expect = chai.expect;
-
-// In order to benefit from type-safety, we re-assign the global web3 instance injected by Truffle
-// with type `any` to a variable of type `Web3`.
-const web3: Web3 = (global as any).web3;
-
-contract('EtherTokenV2', (accounts: string[]) => {
-    const account = accounts[0];
-    const gasPrice = ZeroEx.toBaseUnitAmount(new BigNumber(20), 9);
-    let zeroEx: ZeroEx;
-    let etherTokenAddress: string;
-    beforeEach(async () => {
-        const etherToken = await EtherTokenV2.new();
-        etherTokenAddress = etherToken.address;
-        zeroEx = new ZeroEx(web3.currentProvider, {
-            gasPrice,
-            networkId: constants.TESTRPC_NETWORK_ID,
-        });
-    });
-
-    const sendTransactionAsync = promisify<string>(web3.eth.sendTransaction);
-    const getEthBalanceAsync = async (owner: string) => {
-        const balanceStr = await promisify<string>(web3.eth.getBalance)(owner);
-        const balance = new BigNumber(balanceStr);
-        return balance;
-    };
-
-    describe('deposit', () => {
-        it('should throw if caller attempts to deposit more Ether than caller balance', async () => {
-            const initEthBalance = await getEthBalanceAsync(account);
-            const ethToDeposit = initEthBalance.plus(1);
-
-            return expect(zeroEx.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account))
-                .to.be.rejectedWith(ZeroExError.InsufficientEthBalanceForDeposit);
-        });
-
-        it('should convert deposited Ether to wrapped Ether tokens', async () => {
-            const initEthBalance = await getEthBalanceAsync(account);
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-
-            const ethToDeposit = new BigNumber(web3.toWei(1, 'ether'));
-
-            const txHash = await zeroEx.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account);
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
-
-            const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
-            const finalEthBalance = await getEthBalanceAsync(account);
-            const finalEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-
-            expect(finalEthBalance).to.be.bignumber.equal(initEthBalance.minus(ethToDeposit.plus(ethSpentOnGas)));
-            expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.plus(ethToDeposit));
-        });
-
-        it('should log 1 event with correct arguments', async () => {
-            const ethToDeposit = new BigNumber(web3.toWei(1, 'ether'));
-
-            const txHash = await zeroEx.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account);
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
-
-            const logs = receipt.logs;
-            expect(logs.length).to.equal(1);
-
-            const expectedFrom = ZeroEx.NULL_ADDRESS;
-            const expectedTo = account;
-            const expectedValue = ethToDeposit;
-            const logArgs = (logs[0] as any).args;
-            expect(logArgs._from).to.equal(expectedFrom);
-            expect(logArgs._to).to.equal(expectedTo);
-            expect(logArgs._value).to.be.bignumber.equal(expectedValue);
-        });
-    });
-
-    describe('withdraw', () => {
-        beforeEach(async () => {
-            const ethToDeposit = new BigNumber(web3.toWei(1, 'ether'));
-            await zeroEx.etherToken.depositAsync(etherTokenAddress, ethToDeposit, account);
-        });
-
-        it('should throw if caller attempts to withdraw greater than caller balance', async () => {
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-            const ethTokensToWithdraw = initEthTokenBalance.plus(1);
-
-            return expect(zeroEx.etherToken.withdrawAsync(etherTokenAddress, ethTokensToWithdraw, account))
-                .to.be.rejectedWith(ZeroExError.InsufficientWEthBalanceForWithdrawal);
-        });
-
-        it('should convert ether tokens to ether with sufficient balance', async () => {
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-            const initEthBalance = await getEthBalanceAsync(account);
-            const ethTokensToWithdraw = initEthTokenBalance;
-            expect(ethTokensToWithdraw).to.not.be.bignumber.equal(0);
-            const txHash = await zeroEx.etherToken.withdrawAsync(etherTokenAddress, ethTokensToWithdraw, account, {
-                gasLimit: constants.MAX_ETHERTOKEN_WITHDRAW_GAS,
-            });
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
-
-            const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
-            const finalEthBalance = await getEthBalanceAsync(account);
-            const finalEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-
-            expect(finalEthBalance).to.be.bignumber
-                .equal(initEthBalance.plus(ethTokensToWithdraw.minus(ethSpentOnGas)));
-            expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.minus(ethTokensToWithdraw));
-        });
-
-        it('should log 1 event with correct arguments', async () => {
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-            const ethTokensToWithdraw = initEthTokenBalance;
-            expect(ethTokensToWithdraw).to.not.be.bignumber.equal(0);
-            const txHash = await zeroEx.etherToken.withdrawAsync(etherTokenAddress, ethTokensToWithdraw, account, {
-                gasLimit: constants.MAX_ETHERTOKEN_WITHDRAW_GAS,
-            });
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
-
-            const logs = receipt.logs;
-            expect(logs.length).to.equal(1);
-
-            const expectedFrom = account;
-            const expectedTo = ZeroEx.NULL_ADDRESS;
-            const expectedValue = ethTokensToWithdraw;
-            const logArgs = (logs[0] as any).args;
-            expect(logArgs._from).to.equal(expectedFrom);
-            expect(logArgs._to).to.equal(expectedTo);
-            expect(logArgs._value).to.be.bignumber.equal(expectedValue);
-        });
-    });
-
-    describe('fallback', () => {
-        it('should convert sent ether to ether tokens', async () => {
-            const initEthBalance = await getEthBalanceAsync(account);
-            const initEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-
-            const ethToDeposit = ZeroEx.toBaseUnitAmount(new BigNumber(1), 18);
-
-            const txHash = await sendTransactionAsync({
-                from: account,
-                to: etherTokenAddress,
-                value: ethToDeposit,
-                gasPrice,
-            });
-
-            const receipt = await zeroEx.awaitTransactionMinedAsync(txHash);
-
-            const ethSpentOnGas = gasPrice.times(receipt.gasUsed);
-            const finalEthBalance = await getEthBalanceAsync(account);
-            const finalEthTokenBalance = await zeroEx.token.getBalanceAsync(etherTokenAddress, account);
-
-            expect(finalEthBalance).to.be.bignumber.equal(initEthBalance.minus(ethToDeposit.plus(ethSpentOnGas)));
-            expect(finalEthTokenBalance).to.be.bignumber.equal(initEthTokenBalance.plus(ethToDeposit));
-        });
-    });
-});
diff --git a/packages/contracts/util/artifacts.ts b/packages/contracts/util/artifacts.ts
index 6b05df78c..14acd32a1 100644
--- a/packages/contracts/util/artifacts.ts
+++ b/packages/contracts/util/artifacts.ts
@@ -8,7 +8,6 @@ export class Artifacts {
     public DummyToken: any;
     public DummyTokenV2: any;
     public EtherToken: any;
-    public EtherTokenV2: any;
     public MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress: any;
     public MaliciousToken: any;
     constructor(artifacts: any) {
@@ -20,8 +19,7 @@ export class Artifacts {
         this.ZRXToken = artifacts.require('ZRXToken');
         this.DummyToken = artifacts.require('DummyToken');
         this.DummyTokenV2 = artifacts.require('DummyToken_v2');
-        this.EtherToken = artifacts.require('EtherToken');
-        this.EtherTokenV2 = artifacts.require('EtherToken_v2');
+        this.EtherToken = artifacts.require('WETH9');
         this.MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress = artifacts.require(
                 'MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress');
         this.MaliciousToken = artifacts.require('MaliciousToken');
diff --git a/packages/website/ts/containers/zero_ex_js_documentation.tsx b/packages/website/ts/containers/zero_ex_js_documentation.tsx
index ded62d2bc..2f2c49167 100644
--- a/packages/website/ts/containers/zero_ex_js_documentation.tsx
+++ b/packages/website/ts/containers/zero_ex_js_documentation.tsx
@@ -108,6 +108,9 @@ const docsInfoConfig: DocsInfoConfig = {
         'LogErrorContractEventArgs',
         'LogFillContractEventArgs',
         'LogCancelContractEventArgs',
+        'EtherTokenContractEventArgs',
+        'WithdrawalContractEventArgs',
+        'DepositContractEventArgs',
         'TokenEvents',
         'ExchangeContractEventArgs',
         'TransferContractEventArgs',
@@ -116,6 +119,8 @@ const docsInfoConfig: DocsInfoConfig = {
         'ZeroExConfig',
         'TransactionReceiptWithDecodedLogs',
         'LogWithDecodedArgs',
+        'EtherTokenEvents',
+        'BlockParamLiteral',
         'DecodedLogArgs',
         'MethodOpts',
         'ValidateOrderFillableOpts',