Merge pull request #351 from 0xProject/feature/portal-ledger-support

Portal Ledger Support, Lazy-loading token balances/allowances

53 files changed, 1204 insertions, 645 deletions

diff --git a/packages/website/package.json b/packages/website/package.json
index a5a9eb00a..3d6cc24f7 100644
--- a/packages/website/package.json
+++ b/packages/website/package.json
@@ -36,7 +36,6 @@
         "find-versions": "^2.0.0",
         "is-mobile": "^0.2.2",
         "jsonschema": "^1.2.0",
-        "ledgerco": "0xProject/ledger-node-js-api",
         "less": "^2.7.2",
         "lodash": "^4.17.4",
         "material-ui": "^0.17.1",
diff --git a/packages/website/public/gifs/0xAnimation.gif b/packages/website/public/gifs/0xAnimation.gif
deleted file mode 100644
index b3e32a6ad..000000000
--- a/packages/website/public/gifs/0xAnimation.gif
+++ /dev/null
diff --git a/packages/website/public/images/ledger_icon.png b/packages/website/public/images/ledger_icon.png
new file mode 100644
index 000000000..29b8df08f
--- /dev/null
+++ b/packages/website/public/images/ledger_icon.png
diff --git a/packages/website/public/images/loading_poster.png b/packages/website/public/images/loading_poster.png
deleted file mode 100644
index e5618f260..000000000
--- a/packages/website/public/images/loading_poster.png
+++ /dev/null
diff --git a/packages/website/public/images/metamask_or_parity.png b/packages/website/public/images/metamask_or_parity.png
new file mode 100644
index 000000000..fda646558
--- /dev/null
+++ b/packages/website/public/images/metamask_or_parity.png
diff --git a/packages/website/public/images/network_icons/kovan.png b/packages/website/public/images/network_icons/kovan.png
new file mode 100644
index 000000000..f47a12e74
--- /dev/null
+++ b/packages/website/public/images/network_icons/kovan.png
diff --git a/packages/website/public/images/network_icons/mainnet.png b/packages/website/public/images/network_icons/mainnet.png
new file mode 100644
index 000000000..6693635d6
--- /dev/null
+++ b/packages/website/public/images/network_icons/mainnet.png
diff --git a/packages/website/public/images/network_icons/rinkeby.png b/packages/website/public/images/network_icons/rinkeby.png
new file mode 100644
index 000000000..f9ba18778
--- /dev/null
+++ b/packages/website/public/images/network_icons/rinkeby.png
diff --git a/packages/website/public/images/network_icons/ropsten.png b/packages/website/public/images/network_icons/ropsten.png
new file mode 100644
index 000000000..894910b34
--- /dev/null
+++ b/packages/website/public/images/network_icons/ropsten.png
diff --git a/packages/website/public/videos/0xAnimation.mp4 b/packages/website/public/videos/0xAnimation.mp4
deleted file mode 100644
index d78c07d4f..000000000
--- a/packages/website/public/videos/0xAnimation.mp4
+++ /dev/null
diff --git a/packages/website/ts/blockchain.ts b/packages/website/ts/blockchain.ts
index 5530701c0..d53994c0c 100644
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -37,10 +37,10 @@ import {
     EtherscanLinkSuffixes,
     ProviderType,
     Side,
+    SideToAssetToken,
     SignatureData,
     Token,
     TokenByAddress,
-    TokenStateByAddress,
 } from 'ts/types';
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
@@ -54,6 +54,7 @@ import FilterSubprovider = require('web3-provider-engine/subproviders/filters');
 import * as MintableArtifacts from '../contracts/Mintable.json';
 
 const BLOCK_NUMBER_BACK_TRACK = 50;
+const GWEI_IN_WEI = 1000000000;
 
 export class Blockchain {
     public networkId: number;
@@ -64,8 +65,9 @@ export class Blockchain {
     private _exchangeAddress: string;
     private _userAddress: string;
     private _cachedProvider: Web3.Provider;
+    private _cachedProviderNetworkId: number;
     private _ledgerSubprovider: LedgerWalletSubprovider;
-    private _zrxPollIntervalId: NodeJS.Timer;
+    private _defaultGasPrice: BigNumber;
     private static async _onPageLoadAsync(): Promise<void> {
         if (document.readyState === 'complete') {
             return; // Already loaded
@@ -111,7 +113,7 @@ export class Blockchain {
             // injected into their browser.
             provider = new ProviderEngine();
             provider.addProvider(new FilterSubprovider());
-            const networkId = configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_TESTNET;
+            const networkId = configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_KOVAN;
             provider.addProvider(new RedundantRPCSubprovider(configs.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkId]));
             provider.start();
         }
@@ -121,6 +123,10 @@ export class Blockchain {
     constructor(dispatcher: Dispatcher, isSalePage: boolean = false) {
         this._dispatcher = dispatcher;
         this._userAddress = '';
+        const defaultGasPrice = GWEI_IN_WEI * 30;
+        this._defaultGasPrice = new BigNumber(defaultGasPrice);
+        // tslint:disable-next-line:no-floating-promises
+        this._updateDefaultGasPriceAsync();
         // tslint:disable-next-line:no-floating-promises
         this._onPageLoadInitFireAndForgetAsync();
     }
@@ -133,14 +139,14 @@ export class Blockchain {
         } else if (this.networkId !== newNetworkId) {
             this.networkId = newNetworkId;
             this._dispatcher.encounteredBlockchainError(BlockchainErrs.NoError);
-            await this._fetchTokenInformationAsync();
+            await this.fetchTokenInformationAsync();
             await this._rehydrateStoreWithContractEvents();
         }
     }
     public async userAddressUpdatedFireAndForgetAsync(newUserAddress: string) {
         if (this._userAddress !== newUserAddress) {
             this._userAddress = newUserAddress;
-            await this._fetchTokenInformationAsync();
+            await this.fetchTokenInformationAsync();
             await this._rehydrateStoreWithContractEvents();
         }
     }
@@ -180,84 +186,96 @@ export class Blockchain {
         }
         this._ledgerSubprovider.setPathIndex(pathIndex);
     }
-    public async providerTypeUpdatedFireAndForgetAsync(providerType: ProviderType) {
+    public async updateProviderToLedgerAsync(networkId: number) {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
-        // Should actually be Web3.Provider|ProviderEngine union type but it causes issues
-        // later on in the logic.
-        let provider;
-        switch (providerType) {
-            case ProviderType.Ledger: {
-                const isU2FSupported = await utils.isU2FSupportedAsync();
-                if (!isU2FSupported) {
-                    throw new Error('Cannot update providerType to LEDGER without U2F support');
-                }
 
-                // Cache injected provider so that we can switch the user back to it easily
-                this._cachedProvider = this._web3Wrapper.getProviderObj();
-
-                this._dispatcher.updateUserAddress(''); // Clear old userAddress
-
-                provider = new ProviderEngine();
-                const ledgerWalletConfigs = {
-                    networkId: this.networkId,
-                    ledgerEthereumClientFactoryAsync: ledgerEthereumBrowserClientFactoryAsync,
-                };
-                this._ledgerSubprovider = new LedgerSubprovider(ledgerWalletConfigs);
-                provider.addProvider(this._ledgerSubprovider);
-                provider.addProvider(new FilterSubprovider());
-                const networkId = configs.IS_MAINNET_ENABLED
-                    ? constants.NETWORK_ID_MAINNET
-                    : constants.NETWORK_ID_TESTNET;
-                provider.addProvider(new RedundantRPCSubprovider(configs.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkId]));
-                provider.start();
-                this._web3Wrapper.destroy();
-                const shouldPollUserAddress = false;
-                this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
-                this._zeroEx.setProvider(provider, networkId);
-                await this._postInstantiationOrUpdatingProviderZeroExAsync();
-                break;
-            }
+        const isU2FSupported = await utils.isU2FSupportedAsync();
+        if (!isU2FSupported) {
+            throw new Error('Cannot update providerType to LEDGER without U2F support');
+        }
 
-            case ProviderType.Injected: {
-                if (_.isUndefined(this._cachedProvider)) {
-                    return; // Going from injected to injected, so we noop
-                }
-                provider = this._cachedProvider;
-                const shouldPollUserAddress = true;
-                this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
-                this._zeroEx.setProvider(provider, this.networkId);
-                await this._postInstantiationOrUpdatingProviderZeroExAsync();
-                delete this._ledgerSubprovider;
-                delete this._cachedProvider;
-                break;
-            }
+        // Cache injected provider so that we can switch the user back to it easily
+        if (_.isUndefined(this._cachedProvider)) {
+            this._cachedProvider = this._web3Wrapper.getProviderObj();
+            this._cachedProviderNetworkId = this.networkId;
+        }
 
-            default:
-                throw utils.spawnSwitchErr('providerType', providerType);
+        this._web3Wrapper.destroy();
+
+        this._userAddress = '';
+        this._dispatcher.updateUserAddress(''); // Clear old userAddress
+
+        const provider = new ProviderEngine();
+        const ledgerWalletConfigs = {
+            networkId,
+            ledgerEthereumClientFactoryAsync: ledgerEthereumBrowserClientFactoryAsync,
+        };
+        this._ledgerSubprovider = new LedgerSubprovider(ledgerWalletConfigs);
+        provider.addProvider(this._ledgerSubprovider);
+        provider.addProvider(new FilterSubprovider());
+        provider.addProvider(new RedundantRPCSubprovider(configs.PUBLIC_NODE_URLS_BY_NETWORK_ID[networkId]));
+        provider.start();
+        this.networkId = networkId;
+        this._dispatcher.updateNetworkId(this.networkId);
+        const shouldPollUserAddress = false;
+        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
+        this._zeroEx.setProvider(provider, this.networkId);
+        await this._postInstantiationOrUpdatingProviderZeroExAsync();
+        this._web3Wrapper.startEmittingNetworkConnectionAndUserBalanceState();
+        this._dispatcher.updateProviderType(ProviderType.Ledger);
+    }
+    public async updateProviderToInjectedAsync() {
+        utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
+
+        if (_.isUndefined(this._cachedProvider)) {
+            return; // Going from injected to injected, so we noop
         }
 
-        await this._fetchTokenInformationAsync();
+        this._web3Wrapper.destroy();
+
+        const provider = this._cachedProvider;
+        this.networkId = this._cachedProviderNetworkId;
+
+        const shouldPollUserAddress = true;
+        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
+
+        this._userAddress = await this._web3Wrapper.getFirstAccountIfExistsAsync();
+
+        this._zeroEx.setProvider(provider, this.networkId);
+        await this._postInstantiationOrUpdatingProviderZeroExAsync();
+
+        await this.fetchTokenInformationAsync();
+        this._web3Wrapper.startEmittingNetworkConnectionAndUserBalanceState();
+        this._dispatcher.updateProviderType(ProviderType.Injected);
+        delete this._ledgerSubprovider;
+        delete this._cachedProvider;
     }
     public async setProxyAllowanceAsync(token: Token, amountInBaseUnits: BigNumber): Promise<void> {
         utils.assert(this.isValidAddress(token.address), BlockchainCallErrs.TokenAddressIsInvalid);
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
 
+        this._showFlashMessageIfLedger();
         const txHash = await this._zeroEx.token.setProxyAllowanceAsync(
             token.address,
             this._userAddress,
             amountInBaseUnits,
+            {
+                gasPrice: this._defaultGasPrice,
+            },
         );
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
-        const allowance = amountInBaseUnits;
-        this._dispatcher.replaceTokenAllowanceByAddress(token.address, allowance);
     }
     public async transferAsync(token: Token, toAddress: string, amountInBaseUnits: BigNumber): Promise<void> {
+        this._showFlashMessageIfLedger();
         const txHash = await this._zeroEx.token.transferAsync(
             token.address,
             this._userAddress,
             toAddress,
             amountInBaseUnits,
+            {
+                gasPrice: this._defaultGasPrice,
+            },
         );
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
         const etherScanLinkIfExists = utils.getEtherScanLinkIfExists(txHash, this.networkId, EtherscanLinkSuffixes.Tx);
@@ -309,11 +327,15 @@ export class Blockchain {
 
         const shouldThrowOnInsufficientBalanceOrAllowance = true;
 
+        this._showFlashMessageIfLedger();
         const txHash = await this._zeroEx.exchange.fillOrderAsync(
             signedOrder,
             fillTakerTokenAmount,
             shouldThrowOnInsufficientBalanceOrAllowance,
             this._userAddress,
+            {
+                gasPrice: this._defaultGasPrice,
+            },
         );
         const receipt = await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
         const logs: Array<LogWithDecodedArgs<ExchangeContractEventArgs>> = receipt.logs as any;
@@ -324,7 +346,10 @@ export class Blockchain {
         return filledTakerTokenAmount;
     }
     public async cancelOrderAsync(signedOrder: SignedOrder, cancelTakerTokenAmount: BigNumber): Promise<BigNumber> {
-        const txHash = await this._zeroEx.exchange.cancelOrderAsync(signedOrder, cancelTakerTokenAmount);
+        this._showFlashMessageIfLedger();
+        const txHash = await this._zeroEx.exchange.cancelOrderAsync(signedOrder, cancelTakerTokenAmount, {
+            gasPrice: this._defaultGasPrice,
+        });
         const receipt = await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
         const logs: Array<LogWithDecodedArgs<ExchangeContractEventArgs>> = receipt.logs as any;
         this._zeroEx.exchange.throwLogErrorsAsErrors(logs);
@@ -368,22 +393,25 @@ export class Blockchain {
 
         const [currBalance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
 
-        this._zrxPollIntervalId = intervalUtils.setAsyncExcludingInterval(
-            async () => {
-                const [balance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
-                if (!balance.eq(currBalance)) {
-                    this._dispatcher.replaceTokenBalanceByAddress(token.address, balance);
-                    intervalUtils.clearAsyncExcludingInterval(this._zrxPollIntervalId);
-                    delete this._zrxPollIntervalId;
-                }
-            },
-            5000,
-            (err: Error) => {
-                utils.consoleLog(`Polling tokenBalance failed: ${err}`);
-                intervalUtils.clearAsyncExcludingInterval(this._zrxPollIntervalId);
-                delete this._zrxPollIntervalId;
-            },
-        );
+        const newTokenBalancePromise = new Promise((resolve: (balance: BigNumber) => void, reject) => {
+            const tokenPollInterval = intervalUtils.setAsyncExcludingInterval(
+                async () => {
+                    const [balance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
+                    if (!balance.eq(currBalance)) {
+                        intervalUtils.clearAsyncExcludingInterval(tokenPollInterval);
+                        resolve(balance);
+                    }
+                },
+                5000,
+                (err: Error) => {
+                    utils.consoleLog(`Polling tokenBalance failed: ${err}`);
+                    intervalUtils.clearAsyncExcludingInterval(tokenPollInterval);
+                    reject(err);
+                },
+            );
+        });
+
+        return newTokenBalancePromise;
     }
     public async signOrderHashAsync(orderHash: string): Promise<SignatureData> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
@@ -393,7 +421,21 @@ export class Blockchain {
         if (_.isUndefined(makerAddress)) {
             throw new Error('Tried to send a sign request but user has no associated addresses');
         }
-        const ecSignature = await this._zeroEx.signOrderHashAsync(orderHash, makerAddress);
+
+        this._showFlashMessageIfLedger();
+        const nodeVersion = await this._web3Wrapper.getNodeVersionAsync();
+        const isParityNode = utils.isParityNode(nodeVersion);
+        const isTestRpc = utils.isTestRpc(nodeVersion);
+        const isLedgerSigner = !_.isUndefined(this._ledgerSubprovider);
+        let shouldAddPersonalMessagePrefix = true;
+        if ((isParityNode && !isLedgerSigner) || isTestRpc || isLedgerSigner) {
+            shouldAddPersonalMessagePrefix = false;
+        }
+        const ecSignature = await this._zeroEx.signOrderHashAsync(
+            orderHash,
+            makerAddress,
+            shouldAddPersonalMessagePrefix,
+        );
         const signatureData = _.extend({}, ecSignature, {
             hash: orderHash,
         });
@@ -404,11 +446,11 @@ export class Blockchain {
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
         const mintableContract = await this._instantiateContractIfExistsAsync(MintableArtifacts, token.address);
+        this._showFlashMessageIfLedger();
         await mintableContract.mint(constants.MINT_AMOUNT, {
             from: this._userAddress,
+            gasPrice: this._defaultGasPrice,
         });
-        const balanceDelta = constants.MINT_AMOUNT;
-        this._dispatcher.updateTokenBalanceByAddress(token.address, balanceDelta);
     }
     public async getBalanceInEthAsync(owner: string): Promise<BigNumber> {
         const balance = await this._web3Wrapper.getBalanceInEthAsync(owner);
@@ -418,14 +460,20 @@ export class Blockchain {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
-        const txHash = await this._zeroEx.etherToken.depositAsync(etherTokenAddress, amount, this._userAddress);
+        this._showFlashMessageIfLedger();
+        const txHash = await this._zeroEx.etherToken.depositAsync(etherTokenAddress, amount, this._userAddress, {
+            gasPrice: this._defaultGasPrice,
+        });
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
     }
     public async convertWrappedEthTokensToEthAsync(etherTokenAddress: string, amount: BigNumber): Promise<void> {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
         utils.assert(this._doesUserAddressExist(), BlockchainCallErrs.UserHasNoAssociatedAddresses);
 
-        const txHash = await this._zeroEx.etherToken.withdrawAsync(etherTokenAddress, amount, this._userAddress);
+        this._showFlashMessageIfLedger();
+        const txHash = await this._zeroEx.etherToken.withdrawAsync(etherTokenAddress, amount, this._userAddress, {
+            gasPrice: this._defaultGasPrice,
+        });
         await this._showEtherScanLinkAndAwaitTransactionMinedAsync(txHash);
     }
     public async doesContractExistAtAddressAsync(address: string) {
@@ -451,22 +499,6 @@ export class Blockchain {
         }
         return [balance, allowance];
     }
-    public async updateTokenBalancesAndAllowancesAsync(tokens: Token[]) {
-        const tokenStateByAddress: TokenStateByAddress = {};
-        for (const token of tokens) {
-            let balance = new BigNumber(0);
-            let allowance = new BigNumber(0);
-            if (this._doesUserAddressExist()) {
-                [balance, allowance] = await this.getTokenBalanceAndAllowanceAsync(this._userAddress, token.address);
-            }
-            const tokenState = {
-                balance,
-                allowance,
-            };
-            tokenStateByAddress[token.address] = tokenState;
-        }
-        this._dispatcher.updateTokenStateByAddress(tokenStateByAddress);
-    }
     public async getUserAccountsAsync() {
         utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');
         const userAccountsIfExists = await this._zeroEx.getAvailableAddressesAsync();
@@ -479,10 +511,59 @@ export class Blockchain {
         this._web3Wrapper.updatePrevUserAddress(newUserAddress);
     }
     public destroy() {
-        intervalUtils.clearAsyncExcludingInterval(this._zrxPollIntervalId);
         this._web3Wrapper.destroy();
         this._stopWatchingExchangeLogFillEvents();
     }
+    public async fetchTokenInformationAsync() {
+        utils.assert(
+            !_.isUndefined(this.networkId),
+            'Cannot call fetchTokenInformationAsync if disconnected from Ethereum node',
+        );
+
+        this._dispatcher.updateBlockchainIsLoaded(false);
+
+        const tokenRegistryTokensByAddress = await this._getTokenRegistryTokensByAddressAsync();
+
+        const trackedTokensByAddress = trackedTokenStorage.getTrackedTokensByAddress(this._userAddress, this.networkId);
+        const tokenRegistryTokens = _.values(tokenRegistryTokensByAddress);
+        if (_.isEmpty(trackedTokensByAddress)) {
+            _.each(configs.DEFAULT_TRACKED_TOKEN_SYMBOLS, symbol => {
+                const token = _.find(tokenRegistryTokens, t => t.symbol === symbol);
+                token.isTracked = true;
+                trackedTokensByAddress[token.address] = token;
+            });
+            _.each(trackedTokensByAddress, (token: Token, address: string) => {
+                trackedTokenStorage.addTrackedTokenToUser(this._userAddress, this.networkId, token);
+            });
+        } else {
+            // Properly set all tokenRegistry tokens `isTracked` to true if they are in the existing trackedTokens array
+            _.each(trackedTokensByAddress, (trackedToken: Token, address: string) => {
+                if (!_.isUndefined(tokenRegistryTokensByAddress[address])) {
+                    tokenRegistryTokensByAddress[address].isTracked = true;
+                }
+            });
+        }
+        const allTokensByAddress = {
+            ...tokenRegistryTokensByAddress,
+            ...trackedTokensByAddress,
+        };
+        const allTokens = _.values(allTokensByAddress);
+        const mostPopularTradingPairTokens: Token[] = [
+            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[0] }),
+            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[1] }),
+        ];
+        const sideToAssetToken: SideToAssetToken = {
+            [Side.Deposit]: {
+                address: mostPopularTradingPairTokens[0].address,
+            },
+            [Side.Receive]: {
+                address: mostPopularTradingPairTokens[1].address,
+            },
+        };
+        this._dispatcher.batchDispatch(allTokensByAddress, this.networkId, this._userAddress, sideToAssetToken);
+
+        this._dispatcher.updateBlockchainIsLoaded(true);
+    }
     private async _showEtherScanLinkAndAwaitTransactionMinedAsync(
         txHash: string,
     ): Promise<TransactionReceiptWithDecodedLogs> {
@@ -665,17 +746,23 @@ export class Blockchain {
         }
 
         const provider = await Blockchain._getProviderAsync(injectedWeb3, networkIdIfExists);
-        const networkId = !_.isUndefined(networkIdIfExists)
+        this.networkId = !_.isUndefined(networkIdIfExists)
             ? networkIdIfExists
-            : configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_TESTNET;
+            : configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_KOVAN;
+        this._dispatcher.updateNetworkId(this.networkId);
         const zeroExConfigs = {
-            networkId,
+            networkId: this.networkId,
         };
         this._zeroEx = new ZeroEx(provider, zeroExConfigs);
         this._updateProviderName(injectedWeb3);
         const shouldPollUserAddress = true;
-        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, networkId, shouldPollUserAddress);
+        this._web3Wrapper = new Web3Wrapper(this._dispatcher, provider, this.networkId, shouldPollUserAddress);
         await this._postInstantiationOrUpdatingProviderZeroExAsync();
+        this._userAddress = await this._web3Wrapper.getFirstAccountIfExistsAsync();
+        this._dispatcher.updateUserAddress(this._userAddress);
+        await this.fetchTokenInformationAsync();
+        this._web3Wrapper.startEmittingNetworkConnectionAndUserBalanceState();
+        await this._rehydrateStoreWithContractEvents();
     }
     // This method should always be run after instantiating or updating the provider
     // of the ZeroEx instance.
@@ -690,60 +777,6 @@ export class Blockchain {
             : constants.PROVIDER_NAME_PUBLIC;
         this._dispatcher.updateInjectedProviderName(providerName);
     }
-    private async _fetchTokenInformationAsync() {
-        utils.assert(
-            !_.isUndefined(this.networkId),
-            'Cannot call fetchTokenInformationAsync if disconnected from Ethereum node',
-        );
-
-        this._dispatcher.updateBlockchainIsLoaded(false);
-        this._dispatcher.clearTokenByAddress();
-
-        const tokenRegistryTokensByAddress = await this._getTokenRegistryTokensByAddressAsync();
-
-        // HACK: We need to fetch the userAddress here because otherwise we cannot save the
-        // tracked tokens in localStorage under the users address nor fetch the token
-        // balances and allowances and we need to do this in order not to trigger the blockchain
-        // loading dialog to show up twice. First to load the contracts, and second to load the
-        // balances and allowances.
-        this._userAddress = await this._web3Wrapper.getFirstAccountIfExistsAsync();
-        if (!_.isEmpty(this._userAddress)) {
-            this._dispatcher.updateUserAddress(this._userAddress);
-        }
-
-        let trackedTokensIfExists = trackedTokenStorage.getTrackedTokensIfExists(this._userAddress, this.networkId);
-        const tokenRegistryTokens = _.values(tokenRegistryTokensByAddress);
-        if (_.isUndefined(trackedTokensIfExists)) {
-            trackedTokensIfExists = _.map(configs.DEFAULT_TRACKED_TOKEN_SYMBOLS, symbol => {
-                const token = _.find(tokenRegistryTokens, t => t.symbol === symbol);
-                token.isTracked = true;
-                return token;
-            });
-            _.each(trackedTokensIfExists, token => {
-                trackedTokenStorage.addTrackedTokenToUser(this._userAddress, this.networkId, token);
-            });
-        } else {
-            // Properly set all tokenRegistry tokens `isTracked` to true if they are in the existing trackedTokens array
-            _.each(trackedTokensIfExists, trackedToken => {
-                if (!_.isUndefined(tokenRegistryTokensByAddress[trackedToken.address])) {
-                    tokenRegistryTokensByAddress[trackedToken.address].isTracked = true;
-                }
-            });
-        }
-        const allTokens = _.uniq([...tokenRegistryTokens, ...trackedTokensIfExists]);
-        this._dispatcher.updateTokenByAddress(allTokens);
-
-        // Get balance/allowance for tracked tokens
-        await this.updateTokenBalancesAndAllowancesAsync(trackedTokensIfExists);
-
-        const mostPopularTradingPairTokens: Token[] = [
-            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[0] }),
-            _.find(allTokens, { symbol: configs.DEFAULT_TRACKED_TOKEN_SYMBOLS[1] }),
-        ];
-        this._dispatcher.updateChosenAssetTokenAddress(Side.Deposit, mostPopularTradingPairTokens[0].address);
-        this._dispatcher.updateChosenAssetTokenAddress(Side.Receive, mostPopularTradingPairTokens[1].address);
-        this._dispatcher.updateBlockchainIsLoaded(true);
-    }
     private async _instantiateContractIfExistsAsync(artifact: any, address?: string): Promise<ContractInstance> {
         const c = await contract(artifact);
         const providerObj = this._web3Wrapper.getProviderObj();
@@ -779,4 +812,20 @@ export class Blockchain {
             }
         }
     }
+    private _showFlashMessageIfLedger() {
+        if (!_.isUndefined(this._ledgerSubprovider)) {
+            this._dispatcher.showFlashMessage('Confirm the transaction on your Ledger Nano S');
+        }
+    }
+    private async _updateDefaultGasPriceAsync() {
+        const endpoint = `${configs.BACKEND_BASE_URL}/eth_gas_station`;
+        const response = await fetch(endpoint);
+        if (response.status !== 200) {
+            return; // noop and we keep hard-coded default
+        }
+        const gasInfo = await response.json();
+        const gasPriceInGwei = new BigNumber(gasInfo.average / 10);
+        const gasPriceInWei = gasPriceInGwei.mul(1000000000);
+        this._defaultGasPrice = gasPriceInWei;
+    }
 } // tslint:disable:max-file-line-count
diff --git a/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx b/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx
index f555ca6b1..278e2bbf5 100644
--- a/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx
+++ b/packages/website/ts/components/dialogs/blockchain_err_dialog.tsx
@@ -3,7 +3,7 @@ import Dialog from 'material-ui/Dialog';
 import FlatButton from 'material-ui/FlatButton';
 import * as React from 'react';
 import { Blockchain } from 'ts/blockchain';
-import { BlockchainErrs } from 'ts/types';
+import { BlockchainErrs, Networks } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
@@ -129,7 +129,7 @@ export class BlockchainErrDialog extends React.Component<BlockchainErrDialogProp
                 <div>
                     The 0x smart contracts are not deployed on the Ethereum network you are currently connected to
                     (network Id: {this.props.networkId}). In order to use the 0x portal dApp, please connect to the{' '}
-                    {constants.TESTNET_NAME} testnet (network Id: {constants.NETWORK_ID_TESTNET})
+                    {Networks.Kovan} testnet (network Id: {constants.NETWORK_ID_KOVAN})
                     {configs.IS_MAINNET_ENABLED
                         ? ` or ${constants.MAINNET_NAME} (network Id: ${constants.NETWORK_ID_MAINNET}).`
                         : `.`}
diff --git a/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx b/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
index 661cc1d8c..acd4a7110 100644
--- a/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
+++ b/packages/website/ts/components/dialogs/eth_weth_conversion_dialog.tsx
@@ -2,38 +2,55 @@ import { BigNumber } from '@0xproject/utils';
 import Dialog from 'material-ui/Dialog';
 import FlatButton from 'material-ui/FlatButton';
 import * as React from 'react';
+import { Blockchain } from 'ts/blockchain';
 import { EthAmountInput } from 'ts/components/inputs/eth_amount_input';
 import { TokenAmountInput } from 'ts/components/inputs/token_amount_input';
-import { Side, Token, TokenState } from 'ts/types';
+import { Side, Token } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 
 interface EthWethConversionDialogProps {
+    blockchain: Blockchain;
+    userAddress: string;
+    networkId: number;
     direction: Side;
     onComplete: (direction: Side, value: BigNumber) => void;
     onCancelled: () => void;
     isOpen: boolean;
     token: Token;
-    tokenState: TokenState;
     etherBalance: BigNumber;
+    lastForceTokenStateRefetch: number;
 }
 
 interface EthWethConversionDialogState {
     value?: BigNumber;
     shouldShowIncompleteErrs: boolean;
     hasErrors: boolean;
+    isEthTokenBalanceLoaded: boolean;
+    ethTokenBalance: BigNumber;
 }
 
 export class EthWethConversionDialog extends React.Component<
     EthWethConversionDialogProps,
     EthWethConversionDialogState
 > {
+    private _isUnmounted: boolean;
     constructor() {
         super();
+        this._isUnmounted = false;
         this.state = {
             shouldShowIncompleteErrs: false,
             hasErrors: false,
+            isEthTokenBalanceLoaded: false,
+            ethTokenBalance: new BigNumber(0),
         };
     }
+    public componentWillMount() {
+        // tslint:disable-next-line:no-floating-promises
+        this._fetchEthTokenBalanceAsync();
+    }
+    public componentWillUnmount() {
+        this._isUnmounted = true;
+    }
     public render() {
         const convertDialogActions = [
             <FlatButton key="cancel" label="Cancel" onTouchTap={this._onCancel.bind(this)} />,
@@ -72,8 +89,11 @@ export class EthWethConversionDialog extends React.Component<
                     <div className="pt2 mx-auto" style={{ width: 245 }}>
                         {this.props.direction === Side.Receive ? (
                             <TokenAmountInput
+                                lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
+                                blockchain={this.props.blockchain}
+                                userAddress={this.props.userAddress}
+                                networkId={this.props.networkId}
                                 token={this.props.token}
-                                tokenState={this.props.tokenState}
                                 shouldShowIncompleteErrs={this.state.shouldShowIncompleteErrs}
                                 shouldCheckBalance={true}
                                 shouldCheckAllowance={false}
@@ -93,19 +113,20 @@ export class EthWethConversionDialog extends React.Component<
                         )}
                         <div className="pt1" style={{ fontSize: 12 }}>
                             <div className="left">1 ETH = 1 WETH</div>
-                            {this.props.direction === Side.Receive && (
-                                <div
-                                    className="right"
-                                    onClick={this._onMaxClick.bind(this)}
-                                    style={{
-                                        color: colors.darkBlue,
-                                        textDecoration: 'underline',
-                                        cursor: 'pointer',
-                                    }}
-                                >
-                                    Max
-                                </div>
-                            )}
+                            {this.props.direction === Side.Receive &&
+                                this.state.isEthTokenBalanceLoaded && (
+                                    <div
+                                        className="right"
+                                        onClick={this._onMaxClick.bind(this)}
+                                        style={{
+                                            color: colors.darkBlue,
+                                            textDecoration: 'underline',
+                                            cursor: 'pointer',
+                                        }}
+                                    >
+                                        Max
+                                    </div>
+                                )}
                         </div>
                     </div>
                 </div>
@@ -132,7 +153,7 @@ export class EthWethConversionDialog extends React.Component<
     }
     private _onMaxClick() {
         this.setState({
-            value: this.props.tokenState.balance,
+            value: this.state.ethTokenBalance,
         });
     }
     private _onValueChange(isValid: boolean, amount?: BigNumber) {
@@ -160,4 +181,16 @@ export class EthWethConversionDialog extends React.Component<
         });
         this.props.onCancelled();
     }
+    private async _fetchEthTokenBalanceAsync() {
+        const [balance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
+            this.props.userAddress,
+            this.props.token.address,
+        );
+        if (!this._isUnmounted) {
+            this.setState({
+                isEthTokenBalanceLoaded: true,
+                ethTokenBalance: balance,
+            });
+        }
+    }
 }
diff --git a/packages/website/ts/components/dialogs/ledger_config_dialog.tsx b/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
index 60db93c52..bc5f05241 100644
--- a/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
+++ b/packages/website/ts/components/dialogs/ledger_config_dialog.tsx
@@ -7,8 +7,10 @@ import TextField from 'material-ui/TextField';
 import * as React from 'react';
 import ReactTooltip = require('react-tooltip');
 import { Blockchain } from 'ts/blockchain';
+import { NetworkDropDown } from 'ts/components/dropdowns/network_drop_down';
 import { LifeCycleRaisedButton } from 'ts/components/ui/lifecycle_raised_button';
 import { Dispatcher } from 'ts/redux/dispatcher';
+import { ProviderType } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
@@ -27,27 +29,33 @@ interface LedgerConfigDialogProps {
     dispatcher: Dispatcher;
     blockchain: Blockchain;
     networkId: number;
+    providerType: ProviderType;
 }
 
 interface LedgerConfigDialogState {
-    didConnectFail: boolean;
+    connectionErrMsg: string;
     stepIndex: LedgerSteps;
     userAddresses: string[];
     addressBalances: BigNumber[];
     derivationPath: string;
     derivationErrMsg: string;
+    preferredNetworkId: number;
 }
 
 export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps, LedgerConfigDialogState> {
     constructor(props: LedgerConfigDialogProps) {
         super(props);
+        const derivationPathIfExists = props.blockchain.getLedgerDerivationPathIfExists();
         this.state = {
-            didConnectFail: false,
+            connectionErrMsg: '',
             stepIndex: LedgerSteps.CONNECT,
             userAddresses: [],
             addressBalances: [],
-            derivationPath: configs.DEFAULT_DERIVATION_PATH,
+            derivationPath: _.isUndefined(derivationPathIfExists)
+                ? configs.DEFAULT_DERIVATION_PATH
+                : derivationPathIfExists,
             derivationErrMsg: '',
+            preferredNetworkId: props.networkId,
         };
     }
     public render() {
@@ -74,19 +82,28 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         );
     }
     private _renderConnectStep() {
+        const networkIds = _.values(constants.NETWORK_ID_BY_NAME);
         return (
             <div>
                 <div className="h4 pt3">Follow these instructions before proceeding:</div>
-                <ol>
+                <ol className="mb0">
                     <li className="pb1">Connect your Ledger Nano S & Open the Ethereum application</li>
-                    <li className="pb1">Verify that Browser Support is enabled in Settings</li>
+                    <li className="pb1">Verify that "Browser Support" AND "Contract Data" are enabled in Settings</li>
                     <li className="pb1">
                         If no Browser Support is found in settings, verify that you have{' '}
                         <a href="https://www.ledgerwallet.com/apps/manager" target="_blank">
                             Firmware >1.2
                         </a>
                     </li>
+                    <li>Choose your desired network:</li>
                 </ol>
+                <div className="pb2">
+                    <NetworkDropDown
+                        updateSelectedNetwork={this._onSelectedNetworkUpdated.bind(this)}
+                        selectedNetworkId={this.state.preferredNetworkId}
+                        avialableNetworkIds={networkIds}
+                    />
+                </div>
                 <div className="center pb3">
                     <LifeCycleRaisedButton
                         isPrimary={true}
@@ -95,9 +112,9 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
                         labelComplete="Connected!"
                         onClickAsyncFn={this._onConnectLedgerClickAsync.bind(this, true)}
                     />
-                    {this.state.didConnectFail && (
+                    {!_.isEmpty(this.state.connectionErrMsg) && (
                         <div className="pt2 left-align" style={{ color: colors.red200 }}>
-                            Failed to connect. Follow the instructions and try again.
+                            {this.state.connectionErrMsg}
                         </div>
                     )}
                 </div>
@@ -172,7 +189,8 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
     }
     private _onClose() {
         this.setState({
-            didConnectFail: false,
+            connectionErrMsg: '',
+            stepIndex: LedgerSteps.CONNECT,
         });
         const isOpen = false;
         this.props.toggleDialogFn(isOpen);
@@ -184,6 +202,8 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         const selectAddressBalance = this.state.addressBalances[selectedRowIndex];
         this.props.dispatcher.updateUserAddress(selectedAddress);
         this.props.blockchain.updateWeb3WrapperPrevUserAddress(selectedAddress);
+        // tslint:disable-next-line:no-floating-promises
+        this.props.blockchain.fetchTokenInformationAsync();
         this.props.dispatcher.updateUserEtherBalance(selectAddressBalance);
         this.setState({
             stepIndex: LedgerSteps.CONNECT,
@@ -219,7 +239,7 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         } catch (err) {
             utils.consoleLog(`Ledger error: ${JSON.stringify(err)}`);
             this.setState({
-                didConnectFail: true,
+                connectionErrMsg: 'Failed to connect. Follow the instructions and try again.',
             });
             return false;
         }
@@ -241,6 +261,22 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         });
     }
     private async _onConnectLedgerClickAsync() {
+        const isU2FSupported = await utils.isU2FSupportedAsync();
+        if (!isU2FSupported) {
+            utils.consoleLog(`U2F not supported in this browser`);
+            this.setState({
+                connectionErrMsg: 'U2F not supported by this browser. Try using Chrome.',
+            });
+            return false;
+        }
+
+        if (
+            this.props.providerType !== ProviderType.Ledger ||
+            (this.props.providerType === ProviderType.Ledger && this.props.networkId !== this.state.preferredNetworkId)
+        ) {
+            await this.props.blockchain.updateProviderToLedgerAsync(this.state.preferredNetworkId);
+        }
+
         const didSucceed = await this._fetchAddressesAndBalancesAsync();
         if (didSucceed) {
             this.setState({
@@ -258,4 +294,9 @@ export class LedgerConfigDialog extends React.Component<LedgerConfigDialogProps,
         }
         return userAddresses;
     }
+    private _onSelectedNetworkUpdated(e: any, index: number, networkId: number) {
+        this.setState({
+            preferredNetworkId: networkId,
+        });
+    }
 }
diff --git a/packages/website/ts/components/dialogs/send_dialog.tsx b/packages/website/ts/components/dialogs/send_dialog.tsx
index b3dbce598..d44dd9aab 100644
--- a/packages/website/ts/components/dialogs/send_dialog.tsx
+++ b/packages/website/ts/components/dialogs/send_dialog.tsx
@@ -3,16 +3,20 @@ import * as _ from 'lodash';
 import Dialog from 'material-ui/Dialog';
 import FlatButton from 'material-ui/FlatButton';
 import * as React from 'react';
+import { Blockchain } from 'ts/blockchain';
 import { AddressInput } from 'ts/components/inputs/address_input';
 import { TokenAmountInput } from 'ts/components/inputs/token_amount_input';
-import { Token, TokenState } from 'ts/types';
+import { Token } from 'ts/types';
 
 interface SendDialogProps {
+    blockchain: Blockchain;
+    userAddress: string;
+    networkId: number;
     onComplete: (recipient: string, value: BigNumber) => void;
     onCancelled: () => void;
     isOpen: boolean;
     token: Token;
-    tokenState: TokenState;
+    lastForceTokenStateRefetch: number;
 }
 
 interface SendDialogState {
@@ -66,15 +70,18 @@ export class SendDialog extends React.Component<SendDialogProps, SendDialogState
                     />
                 </div>
                 <TokenAmountInput
+                    blockchain={this.props.blockchain}
+                    userAddress={this.props.userAddress}
+                    networkId={this.props.networkId}
                     label="Amount to send"
                     token={this.props.token}
-                    tokenState={this.props.tokenState}
                     shouldShowIncompleteErrs={this.state.shouldShowIncompleteErrs}
                     shouldCheckBalance={true}
                     shouldCheckAllowance={false}
                     onChange={this._onValueChange.bind(this)}
                     amount={this.state.value}
                     onVisitBalancesPageClick={this.props.onCancelled}
+                    lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
                 />
             </div>
         );
diff --git a/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx b/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx
index 3f29d46f8..bb7e3ed1a 100644
--- a/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx
+++ b/packages/website/ts/components/dialogs/track_token_confirmation_dialog.tsx
@@ -82,16 +82,6 @@ export class TrackTokenConfirmationDialog extends React.Component<
             newTokenEntry.isTracked = true;
             trackedTokenStorage.addTrackedTokenToUser(this.props.userAddress, this.props.networkId, newTokenEntry);
             this.props.dispatcher.updateTokenByAddress([newTokenEntry]);
-
-            const [balance, allowance] = await this.props.blockchain.getCurrentUserTokenBalanceAndAllowanceAsync(
-                token.address,
-            );
-            this.props.dispatcher.updateTokenStateByAddress({
-                [token.address]: {
-                    balance,
-                    allowance,
-                },
-            });
         }
 
         this.setState({
diff --git a/packages/website/ts/components/dropdowns/network_drop_down.tsx b/packages/website/ts/components/dropdowns/network_drop_down.tsx
new file mode 100644
index 000000000..28ec28ed5
--- /dev/null
+++ b/packages/website/ts/components/dropdowns/network_drop_down.tsx
@@ -0,0 +1,40 @@
+import * as _ from 'lodash';
+import DropDownMenu from 'material-ui/DropDownMenu';
+import MenuItem from 'material-ui/MenuItem';
+import * as React from 'react';
+import { constants } from 'ts/utils/constants';
+
+interface NetworkDropDownProps {
+    updateSelectedNetwork: (e: any, index: number, value: number) => void;
+    selectedNetworkId: number;
+    avialableNetworkIds: number[];
+}
+
+interface NetworkDropDownState {}
+
+export class NetworkDropDown extends React.Component<NetworkDropDownProps, NetworkDropDownState> {
+    public render() {
+        return (
+            <div className="mx-auto" style={{ width: 120 }}>
+                <DropDownMenu value={this.props.selectedNetworkId} onChange={this.props.updateSelectedNetwork}>
+                    {this._renderDropDownItems()}
+                </DropDownMenu>
+            </div>
+        );
+    }
+    private _renderDropDownItems() {
+        const items = _.map(this.props.avialableNetworkIds, networkId => {
+            const networkName = constants.NETWORK_NAME_BY_ID[networkId];
+            const primaryText = (
+                <div className="flex">
+                    <div className="pr1" style={{ width: 14, paddingTop: 2 }}>
+                        <img src={`/images/network_icons/${networkName.toLowerCase()}.png`} style={{ width: 14 }} />
+                    </div>
+                    <div>{networkName}</div>
+                </div>
+            );
+            return <MenuItem key={networkId} value={networkId} primaryText={primaryText} />;
+        });
+        return items;
+    }
+}
diff --git a/packages/website/ts/components/eth_weth_conversion_button.tsx b/packages/website/ts/components/eth_weth_conversion_button.tsx
index 300e71f1f..62bafdba7 100644
--- a/packages/website/ts/components/eth_weth_conversion_button.tsx
+++ b/packages/website/ts/components/eth_weth_conversion_button.tsx
@@ -6,21 +6,24 @@ import * as React from 'react';
 import { Blockchain } from 'ts/blockchain';
 import { EthWethConversionDialog } from 'ts/components/dialogs/eth_weth_conversion_dialog';
 import { Dispatcher } from 'ts/redux/dispatcher';
-import { BlockchainCallErrs, Side, Token, TokenState } from 'ts/types';
+import { BlockchainCallErrs, Side, Token } from 'ts/types';
 import { constants } from 'ts/utils/constants';
 import { errorReporter } from 'ts/utils/error_reporter';
 import { utils } from 'ts/utils/utils';
 
 interface EthWethConversionButtonProps {
+    userAddress: string;
+    networkId: number;
     direction: Side;
     ethToken: Token;
-    ethTokenState: TokenState;
     dispatcher: Dispatcher;
     blockchain: Blockchain;
     userEtherBalance: BigNumber;
     isOutdatedWrappedEther: boolean;
     onConversionSuccessful?: () => void;
     isDisabled?: boolean;
+    lastForceTokenStateRefetch: number;
+    refetchEthTokenStateAsync: () => Promise<void>;
 }
 
 interface EthWethConversionButtonState {
@@ -64,13 +67,16 @@ export class EthWethConversionButton extends React.Component<
                     onClick={this._toggleConversionDialog.bind(this)}
                 />
                 <EthWethConversionDialog
+                    blockchain={this.props.blockchain}
+                    userAddress={this.props.userAddress}
+                    networkId={this.props.networkId}
                     direction={this.props.direction}
                     isOpen={this.state.isEthConversionDialogVisible}
                     onComplete={this._onConversionAmountSelectedAsync.bind(this)}
                     onCancelled={this._toggleConversionDialog.bind(this)}
                     etherBalance={this.props.userEtherBalance}
                     token={this.props.ethToken}
-                    tokenState={this.props.ethTokenState}
+                    lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
                 />
             </div>
         );
@@ -86,29 +92,25 @@ export class EthWethConversionButton extends React.Component<
         });
         this._toggleConversionDialog();
         const token = this.props.ethToken;
-        const tokenState = this.props.ethTokenState;
-        let balance = tokenState.balance;
         try {
             if (direction === Side.Deposit) {
                 await this.props.blockchain.convertEthToWrappedEthTokensAsync(token.address, value);
                 const ethAmount = ZeroEx.toUnitAmount(value, constants.DECIMAL_PLACES_ETH);
                 this.props.dispatcher.showFlashMessage(`Successfully wrapped ${ethAmount.toString()} ETH to WETH`);
-                balance = balance.plus(value);
             } else {
                 await this.props.blockchain.convertWrappedEthTokensToEthAsync(token.address, value);
                 const tokenAmount = ZeroEx.toUnitAmount(value, token.decimals);
                 this.props.dispatcher.showFlashMessage(`Successfully unwrapped ${tokenAmount.toString()} WETH to ETH`);
-                balance = balance.minus(value);
             }
             if (!this.props.isOutdatedWrappedEther) {
-                this.props.dispatcher.replaceTokenBalanceByAddress(token.address, balance);
+                await this.props.refetchEthTokenStateAsync();
             }
             this.props.onConversionSuccessful();
         } catch (err) {
             const errMsg = `${err}`;
             if (_.includes(errMsg, BlockchainCallErrs.UserHasNoAssociatedAddresses)) {
                 this.props.dispatcher.updateShouldBlockchainErrDialogBeOpen(true);
-            } else if (!_.includes(errMsg, 'User denied transaction')) {
+            } else if (!utils.didUserDenyWeb3Request(errMsg)) {
                 utils.consoleLog(`Unexpected error encountered: ${err}`);
                 utils.consoleLog(err.stack);
                 const errorMsg =
diff --git a/packages/website/ts/components/eth_wrappers.tsx b/packages/website/ts/components/eth_wrappers.tsx
index d074ec787..db1ceecb5 100644
--- a/packages/website/ts/components/eth_wrappers.tsx
+++ b/packages/website/ts/components/eth_wrappers.tsx
@@ -16,7 +16,6 @@ import {
     Token,
     TokenByAddress,
     TokenState,
-    TokenStateByAddress,
 } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { configs } from 'ts/utils/configs';
@@ -41,19 +40,23 @@ interface EthWrappersProps {
     blockchain: Blockchain;
     dispatcher: Dispatcher;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
     userAddress: string;
     userEtherBalance: BigNumber;
+    lastForceTokenStateRefetch: number;
 }
 
 interface EthWrappersState {
+    ethTokenState: TokenState;
+    isWethStateLoaded: boolean;
     outdatedWETHAddressToIsStateLoaded: OutdatedWETHAddressToIsStateLoaded;
     outdatedWETHStateByAddress: OutdatedWETHStateByAddress;
 }
 
 export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersState> {
+    private _isUnmounted: boolean;
     constructor(props: EthWrappersProps) {
         super(props);
+        this._isUnmounted = false;
         const outdatedWETHAddresses = this._getOutdatedWETHAddresses();
         const outdatedWETHAddressToIsStateLoaded: OutdatedWETHAddressToIsStateLoaded = {};
         const outdatedWETHStateByAddress: OutdatedWETHStateByAddress = {};
@@ -67,18 +70,34 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
         this.state = {
             outdatedWETHAddressToIsStateLoaded,
             outdatedWETHStateByAddress,
+            isWethStateLoaded: false,
+            ethTokenState: {
+                balance: new BigNumber(0),
+                allowance: new BigNumber(0),
+            },
         };
     }
+    public componentWillReceiveProps(nextProps: EthWrappersProps) {
+        if (
+            nextProps.userAddress !== this.props.userAddress ||
+            nextProps.networkId !== this.props.networkId ||
+            nextProps.lastForceTokenStateRefetch !== this.props.lastForceTokenStateRefetch
+        ) {
+            // tslint:disable-next-line:no-floating-promises
+            this._fetchWETHStateAsync();
+        }
+    }
     public componentDidMount() {
         window.scrollTo(0, 0);
         // tslint:disable-next-line:no-floating-promises
-        this._fetchOutdatedWETHStateAsync();
+        this._fetchWETHStateAsync();
+    }
+    public componentWillUnmount() {
+        this._isUnmounted = true;
     }
     public render() {
-        const tokens = _.values(this.props.tokenByAddress);
-        const etherToken = _.find(tokens, { symbol: 'WETH' });
-        const etherTokenState = this.props.tokenStateByAddress[etherToken.address];
-        const wethBalance = ZeroEx.toUnitAmount(etherTokenState.balance, constants.DECIMAL_PLACES_ETH);
+        const etherToken = this._getEthToken();
+        const wethBalance = ZeroEx.toUnitAmount(this.state.ethTokenState.balance, constants.DECIMAL_PLACES_ETH);
         const isBidirectional = true;
         const etherscanUrl = utils.getEtherScanLinkIfExists(
             etherToken.address,
@@ -136,10 +155,13 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
                                     </TableRowColumn>
                                     <TableRowColumn>
                                         <EthWethConversionButton
+                                            refetchEthTokenStateAsync={this._refetchEthTokenStateAsync.bind(this)}
+                                            lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
+                                            userAddress={this.props.userAddress}
+                                            networkId={this.props.networkId}
                                             isOutdatedWrappedEther={false}
                                             direction={Side.Deposit}
                                             ethToken={etherToken}
-                                            ethTokenState={etherTokenState}
                                             dispatcher={this.props.dispatcher}
                                             blockchain={this.props.blockchain}
                                             userEtherBalance={this.props.userEtherBalance}
@@ -150,13 +172,23 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
                                     <TableRowColumn className="py1">
                                         {this._renderTokenLink(tokenLabel, etherscanUrl)}
                                     </TableRowColumn>
-                                    <TableRowColumn>{wethBalance.toFixed(PRECISION)} WETH</TableRowColumn>
+                                    <TableRowColumn>
+                                        {this.state.isWethStateLoaded ? (
+                                            `${wethBalance.toFixed(PRECISION)} WETH`
+                                        ) : (
+                                            <i className="zmdi zmdi-spinner zmdi-hc-spin" />
+                                        )}
+                                    </TableRowColumn>
                                     <TableRowColumn>
                                         <EthWethConversionButton
+                                            refetchEthTokenStateAsync={this._refetchEthTokenStateAsync.bind(this)}
+                                            lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
+                                            userAddress={this.props.userAddress}
+                                            networkId={this.props.networkId}
                                             isOutdatedWrappedEther={false}
                                             direction={Side.Receive}
+                                            isDisabled={!this.state.isWethStateLoaded}
                                             ethToken={etherToken}
-                                            ethTokenState={etherTokenState}
                                             dispatcher={this.props.dispatcher}
                                             blockchain={this.props.blockchain}
                                             userEtherBalance={this.props.userEtherBalance}
@@ -190,7 +222,7 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
                                 </TableRow>
                             </TableHeader>
                             <TableBody displayRowCheckbox={false}>
-                                {this._renderOutdatedWeths(etherToken, etherTokenState)}
+                                {this._renderOutdatedWeths(etherToken, this.state.ethTokenState)}
                             </TableBody>
                         </Table>
                     </div>
@@ -269,6 +301,10 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
                         </TableRowColumn>
                         <TableRowColumn>
                             <EthWethConversionButton
+                                refetchEthTokenStateAsync={this._refetchEthTokenStateAsync.bind(this)}
+                                lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
+                                userAddress={this.props.userAddress}
+                                networkId={this.props.networkId}
                                 isDisabled={!isStateLoaded}
                                 isOutdatedWrappedEther={true}
                                 direction={Side.Receive}
@@ -338,7 +374,14 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             },
         });
     }
-    private async _fetchOutdatedWETHStateAsync() {
+    private async _fetchWETHStateAsync() {
+        const tokens = _.values(this.props.tokenByAddress);
+        const wethToken = _.find(tokens, token => token.symbol === 'WETH');
+        const [wethBalance, wethAllowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
+            this.props.userAddress,
+            wethToken.address,
+        );
+
         const outdatedWETHAddresses = this._getOutdatedWETHAddresses();
         const outdatedWETHAddressToIsStateLoaded: OutdatedWETHAddressToIsStateLoaded = {};
         const outdatedWETHStateByAddress: OutdatedWETHStateByAddress = {};
@@ -353,10 +396,17 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
             };
             outdatedWETHAddressToIsStateLoaded[address] = true;
         }
-        this.setState({
-            outdatedWETHStateByAddress,
-            outdatedWETHAddressToIsStateLoaded,
-        });
+        if (!this._isUnmounted) {
+            this.setState({
+                outdatedWETHStateByAddress,
+                outdatedWETHAddressToIsStateLoaded,
+                ethTokenState: {
+                    balance: wethBalance,
+                    allowance: wethAllowance,
+                },
+                isWethStateLoaded: true,
+            });
+        }
     }
     private _getOutdatedWETHAddresses(): string[] {
         const outdatedWETHAddresses = _.compact(
@@ -371,4 +421,22 @@ export class EthWrappers extends React.Component<EthWrappersProps, EthWrappersSt
         );
         return outdatedWETHAddresses;
     }
+    private _getEthToken() {
+        const tokens = _.values(this.props.tokenByAddress);
+        const etherToken = _.find(tokens, { symbol: 'WETH' });
+        return etherToken;
+    }
+    private async _refetchEthTokenStateAsync() {
+        const etherToken = this._getEthToken();
+        const [balance, allowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
+            this.props.userAddress,
+            etherToken.address,
+        );
+        this.setState({
+            ethTokenState: {
+                balance,
+                allowance,
+            },
+        });
+    }
 } // tslint:disable:max-file-line-count
diff --git a/packages/website/ts/components/fill_order.tsx b/packages/website/ts/components/fill_order.tsx
index 1a150e9ee..d0cfd2cf5 100644
--- a/packages/website/ts/components/fill_order.tsx
+++ b/packages/website/ts/components/fill_order.tsx
@@ -19,7 +19,7 @@ import { VisualOrder } from 'ts/components/visual_order';
 import { Dispatcher } from 'ts/redux/dispatcher';
 import { orderSchema } from 'ts/schemas/order_schema';
 import { SchemaValidator } from 'ts/schemas/validator';
-import { AlertTypes, BlockchainErrs, Order, Token, TokenByAddress, TokenStateByAddress, WebsitePaths } from 'ts/types';
+import { AlertTypes, BlockchainErrs, Order, Token, TokenByAddress, WebsitePaths } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { constants } from 'ts/utils/constants';
 import { errorReporter } from 'ts/utils/error_reporter';
@@ -33,9 +33,9 @@ interface FillOrderProps {
     networkId: number;
     userAddress: string;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
     initialOrder: Order;
     dispatcher: Dispatcher;
+    lastForceTokenStateRefetch: number;
 }
 
 interface FillOrderState {
@@ -59,8 +59,10 @@ interface FillOrderState {
 
 export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
     private _validator: SchemaValidator;
+    private _isUnmounted: boolean;
     constructor(props: FillOrderProps) {
         super(props);
+        this._isUnmounted = false;
         this.state = {
             globalErrMsg: '',
             didOrderValidationRun: false,
@@ -90,6 +92,9 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
     public componentDidMount() {
         window.scrollTo(0, 0);
     }
+    public componentWillUnmount() {
+        this._isUnmounted = true;
+    }
     public render() {
         return (
             <div className="clearfix lg-px4 md-px4 sm-px2" style={{ minHeight: 600 }}>
@@ -185,7 +190,6 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             symbol: takerToken.symbol,
         };
         const fillToken = this.props.tokenByAddress[takerToken.address];
-        const fillTokenState = this.props.tokenStateByAddress[takerToken.address];
         const makerTokenAddress = this.state.parsedOrder.maker.token.address;
         const makerToken = this.props.tokenByAddress[makerTokenAddress];
         const makerAssetToken = {
@@ -249,14 +253,17 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
                 {!isUserMaker && (
                     <div className="clearfix mx-auto relative" style={{ width: 235, height: 108 }}>
                         <TokenAmountInput
+                            blockchain={this.props.blockchain}
+                            userAddress={this.props.userAddress}
+                            networkId={this.props.networkId}
                             label="Fill amount"
                             onChange={this._onFillAmountChange.bind(this)}
                             shouldShowIncompleteErrs={false}
                             token={fillToken}
-                            tokenState={fillTokenState}
                             amount={fillAssetToken.amount}
                             shouldCheckBalance={true}
                             shouldCheckAllowance={true}
+                            lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
                         />
                         <div
                             className="absolute sm-hide xs-hide"
@@ -454,12 +461,14 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
             if (!_.isEmpty(orderJSON)) {
                 orderJSONErrMsg = 'Submitted order JSON is not valid JSON';
             }
-            this.setState({
-                didOrderValidationRun: true,
-                orderJSON,
-                orderJSONErrMsg,
-                parsedOrder,
-            });
+            if (!this._isUnmounted) {
+                this.setState({
+                    didOrderValidationRun: true,
+                    orderJSON,
+                    orderJSONErrMsg,
+                    parsedOrder,
+                });
+            }
             return;
         }
 
@@ -556,11 +565,8 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
                 signedOrder,
                 this.props.orderFillAmount,
             );
-            // After fill completes, let's update the token balances
-            const makerToken = this.props.tokenByAddress[parsedOrder.maker.token.address];
-            const takerToken = this.props.tokenByAddress[parsedOrder.taker.token.address];
-            const tokens = [makerToken, takerToken];
-            await this.props.blockchain.updateTokenBalancesAndAllowancesAsync(tokens);
+            // After fill completes, let's force fetch the token balances
+            this.props.dispatcher.forceTokenStateRefetch();
             this.setState({
                 isFilling: false,
                 didFillOrderSucceed: true,
@@ -573,7 +579,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
                 isFilling: false,
             });
             const errMsg = `${err}`;
-            if (_.includes(errMsg, 'User denied transaction signature')) {
+            if (utils.didUserDenyWeb3Request(errMsg)) {
                 return;
             }
             globalErrMsg = 'Failed to fill order, please refresh and try again';
@@ -653,7 +659,7 @@ export class FillOrder extends React.Component<FillOrderProps, FillOrderState> {
                 isCancelling: false,
             });
             const errMsg = `${err}`;
-            if (_.includes(errMsg, 'User denied transaction signature')) {
+            if (utils.didUserDenyWeb3Request(errMsg)) {
                 return;
             }
             globalErrMsg = 'Failed to cancel order, please refresh and try again';
diff --git a/packages/website/ts/components/generate_order/asset_picker.tsx b/packages/website/ts/components/generate_order/asset_picker.tsx
index df7d87cfd..69fb32a21 100644
--- a/packages/website/ts/components/generate_order/asset_picker.tsx
+++ b/packages/website/ts/components/generate_order/asset_picker.tsx
@@ -8,7 +8,7 @@ import { TrackTokenConfirmation } from 'ts/components/track_token_confirmation';
 import { TokenIcon } from 'ts/components/ui/token_icon';
 import { trackedTokenStorage } from 'ts/local_storage/tracked_token_storage';
 import { Dispatcher } from 'ts/redux/dispatcher';
-import { DialogConfigs, Token, TokenByAddress, TokenState, TokenVisibility } from 'ts/types';
+import { DialogConfigs, Token, TokenByAddress, TokenVisibility } from 'ts/types';
 
 const TOKEN_ICON_DIMENSION = 100;
 const TILE_DIMENSION = 146;
@@ -223,10 +223,7 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
             assetView: AssetViews.NEW_TOKEN_FORM,
         });
     }
-    private _onNewTokenSubmitted(newToken: Token, newTokenState: TokenState) {
-        this.props.dispatcher.updateTokenStateByAddress({
-            [newToken.address]: newTokenState,
-        });
+    private _onNewTokenSubmitted(newToken: Token) {
         trackedTokenStorage.addTrackedTokenToUser(this.props.userAddress, this.props.networkId, newToken);
         this.props.dispatcher.addTokenToTokenByAddress(newToken);
         this.setState({
@@ -256,15 +253,6 @@ export class AssetPicker extends React.Component<AssetPickerProps, AssetPickerSt
         newTokenEntry.isTracked = true;
         trackedTokenStorage.addTrackedTokenToUser(this.props.userAddress, this.props.networkId, newTokenEntry);
 
-        const [balance, allowance] = await this.props.blockchain.getCurrentUserTokenBalanceAndAllowanceAsync(
-            token.address,
-        );
-        this.props.dispatcher.updateTokenStateByAddress({
-            [token.address]: {
-                balance,
-                allowance,
-            },
-        });
         this.props.dispatcher.updateTokenByAddress([newTokenEntry]);
         this.setState({
             isAddingTokenToTracked: false,
diff --git a/packages/website/ts/components/generate_order/generate_order_form.tsx b/packages/website/ts/components/generate_order/generate_order_form.tsx
index 3ae0d48a7..df1241d8d 100644
--- a/packages/website/ts/components/generate_order/generate_order_form.tsx
+++ b/packages/website/ts/components/generate_order/generate_order_form.tsx
@@ -27,7 +27,6 @@ import {
     SignatureData,
     Token,
     TokenByAddress,
-    TokenStateByAddress,
 } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { errorReporter } from 'ts/utils/error_reporter';
@@ -53,7 +52,7 @@ interface GenerateOrderFormProps {
     orderSalt: BigNumber;
     sideToAssetToken: SideToAssetToken;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
+    lastForceTokenStateRefetch: number;
 }
 
 interface GenerateOrderFormState {
@@ -80,10 +79,8 @@ export class GenerateOrderForm extends React.Component<GenerateOrderFormProps, G
         const dispatcher = this.props.dispatcher;
         const depositTokenAddress = this.props.sideToAssetToken[Side.Deposit].address;
         const depositToken = this.props.tokenByAddress[depositTokenAddress];
-        const depositTokenState = this.props.tokenStateByAddress[depositTokenAddress];
         const receiveTokenAddress = this.props.sideToAssetToken[Side.Receive].address;
         const receiveToken = this.props.tokenByAddress[receiveTokenAddress];
-        const receiveTokenState = this.props.tokenStateByAddress[receiveTokenAddress];
         const takerExplanation =
             'If a taker is specified, only they are<br> \
                                   allowed to fill this order. If no taker is<br> \
@@ -110,9 +107,12 @@ export class GenerateOrderForm extends React.Component<GenerateOrderFormProps, G
                                     tokenByAddress={this.props.tokenByAddress}
                                 />
                                 <TokenAmountInput
+                                    lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
+                                    blockchain={this.props.blockchain}
+                                    userAddress={this.props.userAddress}
+                                    networkId={this.props.networkId}
                                     label="Sell amount"
                                     token={depositToken}
-                                    tokenState={depositTokenState}
                                     amount={this.props.sideToAssetToken[Side.Deposit].amount}
                                     onChange={this._onTokenAmountChange.bind(this, depositToken, Side.Deposit)}
                                     shouldShowIncompleteErrs={this.state.shouldShowIncompleteErrs}
@@ -139,9 +139,12 @@ export class GenerateOrderForm extends React.Component<GenerateOrderFormProps, G
                                     tokenByAddress={this.props.tokenByAddress}
                                 />
                                 <TokenAmountInput
+                                    lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
+                                    blockchain={this.props.blockchain}
+                                    userAddress={this.props.userAddress}
+                                    networkId={this.props.networkId}
                                     label="Receive amount"
                                     token={receiveToken}
-                                    tokenState={receiveTokenState}
                                     amount={this.props.sideToAssetToken[Side.Receive].amount}
                                     onChange={this._onTokenAmountChange.bind(this, receiveToken, Side.Receive)}
                                     shouldShowIncompleteErrs={this.state.shouldShowIncompleteErrs}
@@ -242,8 +245,10 @@ export class GenerateOrderForm extends React.Component<GenerateOrderFormProps, G
 
         // Check if all required inputs were supplied
         const debitToken = this.props.sideToAssetToken[Side.Deposit];
-        const debitBalance = this.props.tokenStateByAddress[debitToken.address].balance;
-        const debitAllowance = this.props.tokenStateByAddress[debitToken.address].allowance;
+        const [debitBalance, debitAllowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
+            this.props.userAddress,
+            debitToken.address,
+        );
         const receiveAmount = this.props.sideToAssetToken[Side.Receive].amount;
         if (
             !_.isUndefined(debitToken.amount) &&
diff --git a/packages/website/ts/components/generate_order/new_token_form.tsx b/packages/website/ts/components/generate_order/new_token_form.tsx
index 63645be9a..f76830a49 100644
--- a/packages/website/ts/components/generate_order/new_token_form.tsx
+++ b/packages/website/ts/components/generate_order/new_token_form.tsx
@@ -1,4 +1,3 @@
-import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 import TextField from 'material-ui/TextField';
 import * as React from 'react';
@@ -7,13 +6,13 @@ import { AddressInput } from 'ts/components/inputs/address_input';
 import { Alert } from 'ts/components/ui/alert';
 import { LifeCycleRaisedButton } from 'ts/components/ui/lifecycle_raised_button';
 import { RequiredLabel } from 'ts/components/ui/required_label';
-import { AlertTypes, Token, TokenByAddress, TokenState } from 'ts/types';
+import { AlertTypes, Token, TokenByAddress } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 
 interface NewTokenFormProps {
     blockchain: Blockchain;
     tokenByAddress: TokenByAddress;
-    onNewTokenSubmitted: (token: Token, tokenState: TokenState) => void;
+    onNewTokenSubmitted: (token: Token) => void;
 }
 
 interface NewTokenFormState {
@@ -110,13 +109,9 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
         }
 
         let hasBalanceAllowanceErr = false;
-        let balance = new BigNumber(0);
-        let allowance = new BigNumber(0);
         if (doesContractExist) {
             try {
-                [balance, allowance] = await this.props.blockchain.getCurrentUserTokenBalanceAndAllowanceAsync(
-                    this.state.address,
-                );
+                await this.props.blockchain.getCurrentUserTokenBalanceAndAllowanceAsync(this.state.address);
             } catch (err) {
                 hasBalanceAllowanceErr = true;
             }
@@ -155,11 +150,7 @@ export class NewTokenForm extends React.Component<NewTokenFormProps, NewTokenFor
             isTracked: true,
             isRegistered: false,
         };
-        const newTokenState: TokenState = {
-            balance,
-            allowance,
-        };
-        this.props.onNewTokenSubmitted(newToken, newTokenState);
+        this.props.onNewTokenSubmitted(newToken);
     }
     private _onTokenNameChanged(e: any, name: string) {
         let nameErrText = '';
diff --git a/packages/website/ts/components/inputs/allowance_toggle.tsx b/packages/website/ts/components/inputs/allowance_toggle.tsx
index da46db4f4..45531e74b 100644
--- a/packages/website/ts/components/inputs/allowance_toggle.tsx
+++ b/packages/website/ts/components/inputs/allowance_toggle.tsx
@@ -17,6 +17,8 @@ interface AllowanceToggleProps {
     token: Token;
     tokenState: TokenState;
     userAddress: string;
+    isDisabled: boolean;
+    refetchTokenStateAsync: () => Promise<void>;
 }
 
 interface AllowanceToggleState {
@@ -45,7 +47,7 @@ export class AllowanceToggle extends React.Component<AllowanceToggleProps, Allow
             <div className="flex">
                 <div>
                     <Toggle
-                        disabled={this.state.isSpinnerVisible}
+                        disabled={this.state.isSpinnerVisible || this.props.isDisabled}
                         toggled={this._isAllowanceSet()}
                         onToggle={this._onToggleAllowanceAsync.bind(this)}
                     />
@@ -73,12 +75,13 @@ export class AllowanceToggle extends React.Component<AllowanceToggleProps, Allow
         }
         try {
             await this.props.blockchain.setProxyAllowanceAsync(this.props.token, newAllowanceAmountInBaseUnits);
+            await this.props.refetchTokenStateAsync();
         } catch (err) {
             this.setState({
                 isSpinnerVisible: false,
             });
             const errMsg = `${err}`;
-            if (_.includes(errMsg, 'User denied transaction')) {
+            if (utils.didUserDenyWeb3Request(errMsg)) {
                 return;
             }
             utils.consoleLog(`Unexpected error encountered: ${err}`);
diff --git a/packages/website/ts/components/inputs/balance_bounded_input.tsx b/packages/website/ts/components/inputs/balance_bounded_input.tsx
index ddc434b51..3bbc7a5f6 100644
--- a/packages/website/ts/components/inputs/balance_bounded_input.tsx
+++ b/packages/website/ts/components/inputs/balance_bounded_input.tsx
@@ -18,6 +18,7 @@ interface BalanceBoundedInputProps {
     validate?: (amount: BigNumber) => InputErrMsg;
     onVisitBalancesPageClick?: () => void;
     shouldHideVisitBalancesLink?: boolean;
+    isDisabled?: boolean;
 }
 
 interface BalanceBoundedInputState {
@@ -29,6 +30,7 @@ export class BalanceBoundedInput extends React.Component<BalanceBoundedInputProp
     public static defaultProps: Partial<BalanceBoundedInputProps> = {
         shouldShowIncompleteErrs: false,
         shouldHideVisitBalancesLink: false,
+        isDisabled: false,
     };
     constructor(props: BalanceBoundedInputProps) {
         super(props);
@@ -88,6 +90,7 @@ export class BalanceBoundedInput extends React.Component<BalanceBoundedInputProp
                 hintText={<span style={{ textTransform: 'capitalize' }}>amount</span>}
                 onChange={this._onValueChange.bind(this)}
                 underlineStyle={{ width: 'calc(100% + 50px)' }}
+                disabled={this.props.isDisabled}
             />
         );
     }
@@ -100,7 +103,7 @@ export class BalanceBoundedInput extends React.Component<BalanceBoundedInputProp
             },
             () => {
                 const isValid = _.isUndefined(errMsg);
-                if (utils.isNumeric(amountString)) {
+                if (utils.isNumeric(amountString) && !_.includes(amountString, '-')) {
                     this.props.onChange(isValid, new BigNumber(amountString));
                 } else {
                     this.props.onChange(isValid);
diff --git a/packages/website/ts/components/inputs/token_amount_input.tsx b/packages/website/ts/components/inputs/token_amount_input.tsx
index 63966d759..2b167d875 100644
--- a/packages/website/ts/components/inputs/token_amount_input.tsx
+++ b/packages/website/ts/components/inputs/token_amount_input.tsx
@@ -3,13 +3,16 @@ import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 import * as React from 'react';
 import { Link } from 'react-router-dom';
+import { Blockchain } from 'ts/blockchain';
 import { BalanceBoundedInput } from 'ts/components/inputs/balance_bounded_input';
-import { InputErrMsg, Token, TokenState, ValidatedBigNumberCallback, WebsitePaths } from 'ts/types';
+import { InputErrMsg, Token, ValidatedBigNumberCallback, WebsitePaths } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 
 interface TokenAmountInputProps {
+    userAddress: string;
+    networkId: number;
+    blockchain: Blockchain;
     token: Token;
-    tokenState: TokenState;
     label?: string;
     amount?: BigNumber;
     shouldShowIncompleteErrs: boolean;
@@ -17,11 +20,45 @@ interface TokenAmountInputProps {
     shouldCheckAllowance: boolean;
     onChange: ValidatedBigNumberCallback;
     onVisitBalancesPageClick?: () => void;
+    lastForceTokenStateRefetch: number;
 }
 
-interface TokenAmountInputState {}
+interface TokenAmountInputState {
+    balance: BigNumber;
+    allowance: BigNumber;
+    isBalanceAndAllowanceLoaded: boolean;
+}
 
 export class TokenAmountInput extends React.Component<TokenAmountInputProps, TokenAmountInputState> {
+    private _isUnmounted: boolean;
+    constructor(props: TokenAmountInputProps) {
+        super(props);
+        this._isUnmounted = false;
+        const defaultAmount = new BigNumber(0);
+        this.state = {
+            balance: defaultAmount,
+            allowance: defaultAmount,
+            isBalanceAndAllowanceLoaded: false,
+        };
+    }
+    public componentWillMount() {
+        // tslint:disable-next-line:no-floating-promises
+        this._fetchBalanceAndAllowanceAsync(this.props.token.address, this.props.userAddress);
+    }
+    public componentWillUnmount() {
+        this._isUnmounted = true;
+    }
+    public componentWillReceiveProps(nextProps: TokenAmountInputProps) {
+        if (
+            nextProps.userAddress !== this.props.userAddress ||
+            nextProps.networkId !== this.props.networkId ||
+            nextProps.token.address !== this.props.token.address ||
+            nextProps.lastForceTokenStateRefetch !== this.props.lastForceTokenStateRefetch
+        ) {
+            // tslint:disable-next-line:no-floating-promises
+            this._fetchBalanceAndAllowanceAsync(nextProps.token.address, nextProps.userAddress);
+        }
+    }
     public render() {
         const amount = this.props.amount
             ? ZeroEx.toUnitAmount(this.props.amount, this.props.token.decimals)
@@ -32,12 +69,13 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
                 <BalanceBoundedInput
                     label={this.props.label}
                     amount={amount}
-                    balance={ZeroEx.toUnitAmount(this.props.tokenState.balance, this.props.token.decimals)}
+                    balance={ZeroEx.toUnitAmount(this.state.balance, this.props.token.decimals)}
                     onChange={this._onChange.bind(this)}
                     validate={this._validate.bind(this)}
                     shouldCheckBalance={this.props.shouldCheckBalance}
                     shouldShowIncompleteErrs={this.props.shouldShowIncompleteErrs}
                     onVisitBalancesPageClick={this.props.onVisitBalancesPageClick}
+                    isDisabled={!this.state.isBalanceAndAllowanceLoaded}
                 />
                 <div style={{ paddingTop: hasLabel ? 39 : 14 }}>{this.props.token.symbol}</div>
             </div>
@@ -51,7 +89,7 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
         this.props.onChange(isValid, baseUnitAmount);
     }
     private _validate(amount: BigNumber): InputErrMsg {
-        if (this.props.shouldCheckAllowance && amount.gt(this.props.tokenState.allowance)) {
+        if (this.props.shouldCheckAllowance && amount.gt(this.state.allowance)) {
             return (
                 <span>
                     Insufficient allowance.{' '}
@@ -67,4 +105,20 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
             return undefined;
         }
     }
+    private async _fetchBalanceAndAllowanceAsync(tokenAddress: string, userAddress: string) {
+        this.setState({
+            isBalanceAndAllowanceLoaded: false,
+        });
+        const [balance, allowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
+            userAddress,
+            tokenAddress,
+        );
+        if (!this._isUnmounted) {
+            this.setState({
+                balance,
+                allowance,
+                isBalanceAndAllowanceLoaded: true,
+            });
+        }
+    }
 }
diff --git a/packages/website/ts/components/portal.tsx b/packages/website/ts/components/portal.tsx
index e2e28e8b6..92589f75c 100644
--- a/packages/website/ts/components/portal.tsx
+++ b/packages/website/ts/components/portal.tsx
@@ -1,11 +1,13 @@
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
+import CircularProgress from 'material-ui/CircularProgress';
 import Paper from 'material-ui/Paper';
 import * as React from 'react';
 import * as DocumentTitle from 'react-document-title';
 import { Route, Switch } from 'react-router-dom';
 import { Blockchain } from 'ts/blockchain';
 import { BlockchainErrDialog } from 'ts/components/dialogs/blockchain_err_dialog';
+import { LedgerConfigDialog } from 'ts/components/dialogs/ledger_config_dialog';
 import { PortalDisclaimerDialog } from 'ts/components/dialogs/portal_disclaimer_dialog';
 import { WrappedEthSectionNoticeDialog } from 'ts/components/dialogs/wrapped_eth_section_notice_dialog';
 import { EthWrappers } from 'ts/components/eth_wrappers';
@@ -13,25 +15,15 @@ import { FillOrder } from 'ts/components/fill_order';
 import { Footer } from 'ts/components/footer';
 import { PortalMenu } from 'ts/components/portal_menu';
 import { TokenBalances } from 'ts/components/token_balances';
-import { TopBar } from 'ts/components/top_bar';
+import { TopBar } from 'ts/components/top_bar/top_bar';
 import { TradeHistory } from 'ts/components/trade_history/trade_history';
 import { FlashMessage } from 'ts/components/ui/flash_message';
-import { Loading } from 'ts/components/ui/loading';
 import { GenerateOrderForm } from 'ts/containers/generate_order_form';
 import { localStorage } from 'ts/local_storage/local_storage';
 import { Dispatcher } from 'ts/redux/dispatcher';
 import { orderSchema } from 'ts/schemas/order_schema';
 import { SchemaValidator } from 'ts/schemas/validator';
-import {
-    BlockchainErrs,
-    HashData,
-    Order,
-    ScreenWidths,
-    Token,
-    TokenByAddress,
-    TokenStateByAddress,
-    WebsitePaths,
-} from 'ts/types';
+import { BlockchainErrs, HashData, Order, ProviderType, ScreenWidths, TokenByAddress, WebsitePaths } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { configs } from 'ts/utils/configs';
 import { constants } from 'ts/utils/constants';
@@ -46,18 +38,20 @@ export interface PortalAllProps {
     blockchainIsLoaded: boolean;
     dispatcher: Dispatcher;
     hashData: HashData;
+    injectedProviderName: string;
     networkId: number;
     nodeVersion: string;
     orderFillAmount: BigNumber;
+    providerType: ProviderType;
     screenWidth: ScreenWidths;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
     userEtherBalance: BigNumber;
     userAddress: string;
     shouldBlockchainErrDialogBeOpen: boolean;
     userSuppliedOrderCache: Order;
     location: Location;
     flashMessage?: string | React.ReactNode;
+    lastForceTokenStateRefetch: number;
 }
 
 interface PortalAllState {
@@ -67,6 +61,7 @@ interface PortalAllState {
     prevPathname: string;
     isDisclaimerDialogOpen: boolean;
     isWethNoticeDialogOpen: boolean;
+    isLedgerDialogOpen: boolean;
 }
 
 export class Portal extends React.Component<PortalAllProps, PortalAllState> {
@@ -96,6 +91,7 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
             prevPathname: this.props.location.pathname,
             isDisclaimerDialogOpen: !hasAcceptedDisclaimer,
             isWethNoticeDialogOpen: !hasAlreadyDismissedWethNotice && isViewingBalances,
+            isLedgerDialogOpen: false,
         };
     }
     public componentDidMount() {
@@ -125,11 +121,6 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
         if (nextProps.userAddress !== this.state.prevUserAddress) {
             // tslint:disable-next-line:no-floating-promises
             this._blockchain.userAddressUpdatedFireAndForgetAsync(nextProps.userAddress);
-            if (!_.isEmpty(nextProps.userAddress) && nextProps.blockchainIsLoaded) {
-                const tokens = _.values(nextProps.tokenByAddress);
-                // tslint:disable-next-line:no-floating-promises
-                this._updateBalanceAndAllowanceWithLoadingScreenAsync(tokens);
-            }
             this.setState({
                 prevUserAddress: nextProps.userAddress,
             });
@@ -167,8 +158,14 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
                 <DocumentTitle title="0x Portal DApp" />
                 <TopBar
                     userAddress={this.props.userAddress}
+                    networkId={this.props.networkId}
+                    injectedProviderName={this.props.injectedProviderName}
+                    onToggleLedgerDialog={this.onToggleLedgerDialog.bind(this)}
+                    dispatcher={this.props.dispatcher}
+                    providerType={this.props.providerType}
                     blockchainIsLoaded={this.props.blockchainIsLoaded}
                     location={this.props.location}
+                    blockchain={this._blockchain}
                 />
                 <div id="portal" className="mx-auto max-width-4" style={{ width: '100%' }}>
                     <Paper className="mb3 mt2">
@@ -215,7 +212,19 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
                                                 />
                                             </Switch>
                                         ) : (
-                                            <Loading />
+                                            <div className="pt4 sm-px2 sm-pt2 sm-m1" style={{ height: 500 }}>
+                                                <div
+                                                    className="relative sm-px2 sm-pt2 sm-m1"
+                                                    style={{ height: 122, top: '50%', transform: 'translateY(-50%)' }}
+                                                >
+                                                    <div className="center pb2">
+                                                        <CircularProgress size={40} thickness={5} />
+                                                    </div>
+                                                    <div className="center pt2" style={{ paddingBottom: 11 }}>
+                                                        Loading Portal...
+                                                    </div>
+                                                </div>
+                                            </div>
                                         )}
                                     </div>
                                 </div>
@@ -239,11 +248,26 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
                         onToggleDialog={this._onPortalDisclaimerAccepted.bind(this)}
                     />
                     <FlashMessage dispatcher={this.props.dispatcher} flashMessage={this.props.flashMessage} />
+                    {this.props.blockchainIsLoaded && (
+                        <LedgerConfigDialog
+                            providerType={this.props.providerType}
+                            networkId={this.props.networkId}
+                            blockchain={this._blockchain}
+                            dispatcher={this.props.dispatcher}
+                            toggleDialogFn={this.onToggleLedgerDialog.bind(this)}
+                            isOpen={this.state.isLedgerDialogOpen}
+                        />
+                    )}
                 </div>
-                <Footer />
+                <Footer />;
             </div>
         );
     }
+    public onToggleLedgerDialog() {
+        this.setState({
+            isLedgerDialogOpen: !this.state.isLedgerDialogOpen,
+        });
+    }
     private _renderEthWrapper() {
         return (
             <EthWrappers
@@ -251,9 +275,9 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
                 blockchain={this._blockchain}
                 dispatcher={this.props.dispatcher}
                 tokenByAddress={this.props.tokenByAddress}
-                tokenStateByAddress={this.props.tokenStateByAddress}
                 userAddress={this.props.userAddress}
                 userEtherBalance={this.props.userEtherBalance}
+                lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
             />
         );
     }
@@ -267,6 +291,8 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
         );
     }
     private _renderTokenBalances() {
+        const allTokens = _.values(this.props.tokenByAddress);
+        const trackedTokens = _.filter(allTokens, t => t.isTracked);
         return (
             <TokenBalances
                 blockchain={this._blockchain}
@@ -275,10 +301,11 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
                 dispatcher={this.props.dispatcher}
                 screenWidth={this.props.screenWidth}
                 tokenByAddress={this.props.tokenByAddress}
-                tokenStateByAddress={this.props.tokenStateByAddress}
+                trackedTokens={trackedTokens}
                 userAddress={this.props.userAddress}
                 userEtherBalance={this.props.userEtherBalance}
                 networkId={this.props.networkId}
+                lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
             />
         );
     }
@@ -296,8 +323,8 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
                 networkId={this.props.networkId}
                 userAddress={this.props.userAddress}
                 tokenByAddress={this.props.tokenByAddress}
-                tokenStateByAddress={this.props.tokenStateByAddress}
                 dispatcher={this.props.dispatcher}
+                lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
             />
         );
     }
@@ -353,9 +380,4 @@ export class Portal extends React.Component<PortalAllProps, PortalAllState> {
         const newScreenWidth = utils.getScreenWidth();
         this.props.dispatcher.updateScreenWidth(newScreenWidth);
     }
-    private async _updateBalanceAndAllowanceWithLoadingScreenAsync(tokens: Token[]) {
-        this.props.dispatcher.updateBlockchainIsLoaded(false);
-        await this._blockchain.updateTokenBalancesAndAllowancesAsync(tokens);
-        this.props.dispatcher.updateBlockchainIsLoaded(true);
-    }
 }
diff --git a/packages/website/ts/components/send_button.tsx b/packages/website/ts/components/send_button.tsx
index f94ec346a..ffa165f60 100644
--- a/packages/website/ts/components/send_button.tsx
+++ b/packages/website/ts/components/send_button.tsx
@@ -5,16 +5,19 @@ import * as React from 'react';
 import { Blockchain } from 'ts/blockchain';
 import { SendDialog } from 'ts/components/dialogs/send_dialog';
 import { Dispatcher } from 'ts/redux/dispatcher';
-import { BlockchainCallErrs, Token, TokenState } from 'ts/types';
+import { BlockchainCallErrs, Token } from 'ts/types';
 import { errorReporter } from 'ts/utils/error_reporter';
 import { utils } from 'ts/utils/utils';
 
 interface SendButtonProps {
+    userAddress: string;
+    networkId: number;
     token: Token;
-    tokenState: TokenState;
     dispatcher: Dispatcher;
     blockchain: Blockchain;
     onError: () => void;
+    lastForceTokenStateRefetch: number;
+    refetchTokenStateAsync: (tokenAddress: string) => Promise<void>;
 }
 
 interface SendButtonState {
@@ -42,11 +45,14 @@ export class SendButton extends React.Component<SendButtonProps, SendButtonState
                     onClick={this._toggleSendDialog.bind(this)}
                 />
                 <SendDialog
+                    blockchain={this.props.blockchain}
+                    userAddress={this.props.userAddress}
+                    networkId={this.props.networkId}
                     isOpen={this.state.isSendDialogVisible}
                     onComplete={this._onSendAmountSelectedAsync.bind(this)}
                     onCancelled={this._toggleSendDialog.bind(this)}
                     token={this.props.token}
-                    tokenState={this.props.tokenState}
+                    lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
                 />
             </div>
         );
@@ -62,18 +68,15 @@ export class SendButton extends React.Component<SendButtonProps, SendButtonState
         });
         this._toggleSendDialog();
         const token = this.props.token;
-        const tokenState = this.props.tokenState;
-        let balance = tokenState.balance;
         try {
             await this.props.blockchain.transferAsync(token, recipient, value);
-            balance = balance.minus(value);
-            this.props.dispatcher.replaceTokenBalanceByAddress(token.address, balance);
+            await this.props.refetchTokenStateAsync(token.address);
         } catch (err) {
             const errMsg = `${err}`;
             if (_.includes(errMsg, BlockchainCallErrs.UserHasNoAssociatedAddresses)) {
                 this.props.dispatcher.updateShouldBlockchainErrDialogBeOpen(true);
                 return;
-            } else if (!_.includes(errMsg, 'User denied transaction')) {
+            } else if (!utils.didUserDenyWeb3Request(errMsg)) {
                 utils.consoleLog(`Unexpected error encountered: ${err}`);
                 utils.consoleLog(err.stack);
                 this.props.onError();
diff --git a/packages/website/ts/components/token_balances.tsx b/packages/website/ts/components/token_balances.tsx
index 2cef413c7..c6a9a46be 100644
--- a/packages/website/ts/components/token_balances.tsx
+++ b/packages/website/ts/components/token_balances.tsx
@@ -27,11 +27,11 @@ import {
     BlockchainCallErrs,
     BlockchainErrs,
     EtherscanLinkSuffixes,
+    Networks,
     ScreenWidths,
     Styles,
     Token,
     TokenByAddress,
-    TokenStateByAddress,
     TokenVisibility,
 } from 'ts/types';
 import { colors } from 'ts/utils/colors';
@@ -58,6 +58,14 @@ const styles: Styles = {
     },
 };
 
+interface TokenStateByAddress {
+    [address: string]: {
+        balance: BigNumber;
+        allowance: BigNumber;
+        isLoaded: boolean;
+    };
+}
+
 interface TokenBalancesProps {
     blockchain: Blockchain;
     blockchainErr: BlockchainErrs;
@@ -65,10 +73,11 @@ interface TokenBalancesProps {
     dispatcher: Dispatcher;
     screenWidth: ScreenWidths;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
+    trackedTokens: Token[];
     userAddress: string;
     userEtherBalance: BigNumber;
     networkId: number;
+    lastForceTokenStateRefetch: number;
 }
 
 interface TokenBalancesState {
@@ -76,14 +85,17 @@ interface TokenBalancesState {
     isBalanceSpinnerVisible: boolean;
     isDharmaDialogVisible: boolean;
     isZRXSpinnerVisible: boolean;
-    currentZrxBalance?: BigNumber;
     isTokenPickerOpen: boolean;
     isAddingToken: boolean;
+    trackedTokenStateByAddress: TokenStateByAddress;
 }
 
 export class TokenBalances extends React.Component<TokenBalancesProps, TokenBalancesState> {
+    private _isUnmounted: boolean;
     public constructor(props: TokenBalancesProps) {
         super(props);
+        this._isUnmounted = false;
+        const initialTrackedTokenStateByAddress = this._getInitialTrackedTokenStateByAddress(props.trackedTokens);
         this.state = {
             errorType: undefined,
             isBalanceSpinnerVisible: false,
@@ -91,8 +103,17 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             isDharmaDialogVisible: DharmaLoanFrame.isAuthTokenPresent(),
             isTokenPickerOpen: false,
             isAddingToken: false,
+            trackedTokenStateByAddress: initialTrackedTokenStateByAddress,
         };
     }
+    public componentWillMount() {
+        const trackedTokenAddresses = _.keys(this.state.trackedTokenStateByAddress);
+        // tslint:disable-next-line:no-floating-promises
+        this._fetchBalancesAndAllowancesAsync(trackedTokenAddresses);
+    }
+    public componentWillUnmount() {
+        this._isUnmounted = true;
+    }
     public componentWillReceiveProps(nextProps: TokenBalancesProps) {
         if (nextProps.userEtherBalance !== this.props.userEtherBalance) {
             if (this.state.isBalanceSpinnerVisible) {
@@ -103,18 +124,36 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                 isBalanceSpinnerVisible: false,
             });
         }
-        const nextZrxToken = _.find(_.values(nextProps.tokenByAddress), t => t.symbol === ZRX_TOKEN_SYMBOL);
-        const nextZrxTokenBalance = nextProps.tokenStateByAddress[nextZrxToken.address].balance;
-        if (!_.isUndefined(this.state.currentZrxBalance) && !nextZrxTokenBalance.eq(this.state.currentZrxBalance)) {
-            if (this.state.isZRXSpinnerVisible) {
-                const receivedAmount = nextZrxTokenBalance.minus(this.state.currentZrxBalance);
-                const receiveAmountInUnits = ZeroEx.toUnitAmount(receivedAmount, constants.DECIMAL_PLACES_ZRX);
-                this.props.dispatcher.showFlashMessage(`Received ${receiveAmountInUnits.toString(10)} Kovan ZRX`);
+
+        if (
+            nextProps.userAddress !== this.props.userAddress ||
+            nextProps.networkId !== this.props.networkId ||
+            nextProps.lastForceTokenStateRefetch !== this.props.lastForceTokenStateRefetch
+        ) {
+            const trackedTokenAddresses = _.keys(this.state.trackedTokenStateByAddress);
+            // tslint:disable-next-line:no-floating-promises
+            this._fetchBalancesAndAllowancesAsync(trackedTokenAddresses);
+        }
+
+        if (!_.isEqual(nextProps.trackedTokens, this.props.trackedTokens)) {
+            const newTokens = _.difference(nextProps.trackedTokens, this.props.trackedTokens);
+            const newTokenAddresses = _.map(newTokens, token => token.address);
+            // Add placeholder entry for this token to the state, since fetching the
+            // balance/allowance is asynchronous
+            const trackedTokenStateByAddress = this.state.trackedTokenStateByAddress;
+            for (const tokenAddress of newTokenAddresses) {
+                trackedTokenStateByAddress[tokenAddress] = {
+                    balance: new BigNumber(0),
+                    allowance: new BigNumber(0),
+                    isLoaded: false,
+                };
             }
             this.setState({
-                isZRXSpinnerVisible: false,
-                currentZrxBalance: undefined,
+                trackedTokenStateByAddress,
             });
+            // Fetch the actual balance/allowance.
+            // tslint:disable-next-line:no-floating-promises
+            this._fetchBalancesAndAllowancesAsync(newTokenAddresses);
         }
     }
     public componentDidMount() {
@@ -137,13 +176,13 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                 onTouchTap={this._onDharmaDialogToggle.bind(this, false)}
             />,
         ];
-        const isTestNetwork = this.props.networkId === constants.NETWORK_ID_TESTNET;
+        const isKovanTestNetwork = this.props.networkId === constants.NETWORK_ID_KOVAN;
         const dharmaButtonColumnStyle = {
             paddingLeft: 3,
-            display: isTestNetwork ? 'table-cell' : 'none',
+            display: isKovanTestNetwork ? 'table-cell' : 'none',
         };
         const stubColumnStyle = {
-            display: isTestNetwork ? 'none' : 'table-cell',
+            display: isKovanTestNetwork ? 'none' : 'table-cell',
         };
         const allTokenRowHeight = _.size(this.props.tokenByAddress) * TOKEN_TABLE_ROW_HEIGHT;
         const tokenTableHeight =
@@ -162,10 +201,10 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                                   smart contract so you can start trading that token.';
         return (
             <div className="lg-px4 md-px4 sm-px1 pb2">
-                <h3>{isTestNetwork ? 'Test ether' : 'Ether'}</h3>
+                <h3>{isKovanTestNetwork ? 'Test ether' : 'Ether'}</h3>
                 <Divider />
                 <div className="pt2 pb2">
-                    {isTestNetwork
+                    {isKovanTestNetwork
                         ? 'In order to try out the 0x Portal Dapp, request some test ether to pay for \
                         gas costs. It might take a bit of time for the test ether to show up.'
                         : 'Ether must be converted to Ether Tokens in order to be tradable via 0x. \
@@ -177,12 +216,12 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                             <TableHeaderColumn>Currency</TableHeaderColumn>
                             <TableHeaderColumn>Balance</TableHeaderColumn>
                             <TableRowColumn className="sm-hide xs-hide" style={stubColumnStyle} />
-                            {isTestNetwork && (
+                            {isKovanTestNetwork && (
                                 <TableHeaderColumn style={{ paddingLeft: 3 }}>
                                     {isSmallScreen ? 'Faucet' : 'Request from faucet'}
                                 </TableHeaderColumn>
                             )}
-                            {isTestNetwork && (
+                            {isKovanTestNetwork && (
                                 <TableHeaderColumn style={dharmaButtonColumnStyle}>
                                     {isSmallScreen ? 'Loan' : 'Request Dharma loan'}
                                     <HelpTooltip style={{ paddingLeft: 4 }} explanation={dharmaLoanExplanation} />
@@ -204,7 +243,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                                 )}
                             </TableRowColumn>
                             <TableRowColumn className="sm-hide xs-hide" style={stubColumnStyle} />
-                            {isTestNetwork && (
+                            {isKovanTestNetwork && (
                                 <TableRowColumn style={{ paddingLeft: 3 }}>
                                     <LifeCycleRaisedButton
                                         labelReady="Request"
@@ -214,7 +253,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                                     />
                                 </TableRowColumn>
                             )}
-                            {isTestNetwork && (
+                            {isKovanTestNetwork && (
                                 <TableRowColumn style={dharmaButtonColumnStyle}>
                                     <RaisedButton
                                         label="Request"
@@ -228,7 +267,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                 </Table>
                 <div className="clearfix" style={{ paddingBottom: 1 }}>
                     <div className="col col-10">
-                        <h3 className="pt2">{isTestNetwork ? 'Test tokens' : 'Tokens'}</h3>
+                        <h3 className="pt2">{isKovanTestNetwork ? 'Test tokens' : 'Tokens'}</h3>
                     </div>
                     <div className="col col-1 pt3 align-right">
                         <FloatingActionButton mini={true} zDepth={0} onClick={this._onAddTokenClicked.bind(this)}>
@@ -243,7 +282,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                 </div>
                 <Divider />
                 <div className="pt2 pb2">
-                    {isTestNetwork
+                    {isKovanTestNetwork
                         ? "Mint some test tokens you'd like to use to generate or fill an order using 0x."
                         : "Set trading permissions for a token you'd like to start trading."}
                 </div>
@@ -303,8 +342,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
         const isSmallScreen = this.props.screenWidth === ScreenWidths.Sm;
         const tokenColSpan = isSmallScreen ? TOKEN_COL_SPAN_SM : TOKEN_COL_SPAN_LG;
         const actionPaddingX = isSmallScreen ? 2 : 24;
-        const allTokens = _.values(this.props.tokenByAddress);
-        const trackedTokens = _.filter(allTokens, t => t.isTracked);
+        const trackedTokens = this.props.trackedTokens;
         const trackedTokensStartingWithEtherToken = trackedTokens.sort(
             firstBy((t: Token) => t.symbol !== ETHER_TOKEN_SYMBOL)
                 .thenBy((t: Token) => t.symbol !== ZRX_TOKEN_SYMBOL)
@@ -317,7 +355,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
         return tableRows;
     }
     private _renderTokenRow(tokenColSpan: number, actionPaddingX: number, token: Token) {
-        const tokenState = this.props.tokenStateByAddress[token.address];
+        const tokenState = this.state.trackedTokenStateByAddress[token.address];
         const tokenLink = utils.getEtherScanLinkIfExists(
             token.address,
             this.props.networkId,
@@ -338,13 +376,19 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                     )}
                 </TableRowColumn>
                 <TableRowColumn style={{ paddingRight: 3, paddingLeft: 3 }}>
-                    {this._renderAmount(tokenState.balance, token.decimals)} {token.symbol}
-                    {this.state.isZRXSpinnerVisible &&
-                        token.symbol === ZRX_TOKEN_SYMBOL && (
-                            <span className="pl1">
-                                <i className="zmdi zmdi-spinner zmdi-hc-spin" />
-                            </span>
-                        )}
+                    {tokenState.isLoaded ? (
+                        <span>
+                            {this._renderAmount(tokenState.balance, token.decimals)} {token.symbol}
+                            {this.state.isZRXSpinnerVisible &&
+                                token.symbol === ZRX_TOKEN_SYMBOL && (
+                                    <span className="pl1">
+                                        <i className="zmdi zmdi-spinner zmdi-hc-spin" />
+                                    </span>
+                                )}
+                        </span>
+                    ) : (
+                        <i className="zmdi zmdi-spinner zmdi-hc-spin" />
+                    )}
                 </TableRowColumn>
                 <TableRowColumn>
                     <AllowanceToggle
@@ -354,6 +398,8 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                         tokenState={tokenState}
                         onErrorOccurred={this._onErrorOccurred.bind(this)}
                         userAddress={this.props.userAddress}
+                        isDisabled={!tokenState.isLoaded}
+                        refetchTokenStateAsync={this._refetchTokenStateAsync.bind(this, token.address)}
                     />
                 </TableRowColumn>
                 <TableRowColumn style={{ paddingLeft: actionPaddingX, paddingRight: actionPaddingX }}>
@@ -366,7 +412,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                         />
                     )}
                     {token.symbol === ZRX_TOKEN_SYMBOL &&
-                        this.props.networkId === constants.NETWORK_ID_TESTNET && (
+                        this.props.networkId === constants.NETWORK_ID_KOVAN && (
                             <LifeCycleRaisedButton
                                 labelReady="Request"
                                 labelLoading="Sending..."
@@ -383,11 +429,14 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                         }}
                     >
                         <SendButton
+                            userAddress={this.props.userAddress}
+                            networkId={this.props.networkId}
                             blockchain={this.props.blockchain}
                             dispatcher={this.props.dispatcher}
                             token={token}
-                            tokenState={tokenState}
                             onError={this._onSendFailed.bind(this)}
+                            lastForceTokenStateRefetch={this.props.lastForceTokenStateRefetch}
+                            refetchTokenStateAsync={this._refetchTokenStateAsync.bind(this, token.address)}
                         />
                     </TableRowColumn>
                 )}
@@ -414,7 +463,6 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             } else {
                 this.props.dispatcher.removeTokenToTokenByAddress(token);
             }
-            this.props.dispatcher.removeFromTokenStateByAddress(tokenAddress);
             trackedTokenStorage.removeTrackedToken(this.props.userAddress, this.props.networkId, tokenAddress);
         } else if (isDefaultTrackedToken) {
             this.props.dispatcher.showFlashMessage(`Cannot remove ${token.name} because it's a default token`);
@@ -449,9 +497,9 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             case BalanceErrs.incorrectNetworkForFaucet:
                 return (
                     <div>
-                        Our faucet can only send test Ether to addresses on the {constants.TESTNET_NAME} testnet
-                        (networkId {constants.NETWORK_ID_TESTNET}). Please make sure you are connected to the{' '}
-                        {constants.TESTNET_NAME} testnet and try requesting ether again.
+                        Our faucet can only send test Ether to addresses on the {Networks.Kovan} testnet (networkId{' '}
+                        {constants.NETWORK_ID_KOVAN}). Please make sure you are connected to the {Networks.Kovan}{' '}
+                        testnet and try requesting ether again.
                     </div>
                 );
 
@@ -510,6 +558,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
     private async _onMintTestTokensAsync(token: Token): Promise<boolean> {
         try {
             await this.props.blockchain.mintTestTokensAsync(token);
+            await this._refetchTokenStateAsync(token.address);
             const amount = ZeroEx.toUnitAmount(constants.MINT_AMOUNT, token.decimals);
             this.props.dispatcher.showFlashMessage(`Successfully minted ${amount.toString(10)} ${token.symbol}`);
             return true;
@@ -519,7 +568,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                 this.props.dispatcher.updateShouldBlockchainErrDialogBeOpen(true);
                 return false;
             }
-            if (_.includes(errMsg, 'User denied transaction')) {
+            if (utils.didUserDenyWeb3Request(errMsg)) {
                 return false;
             }
             utils.consoleLog(`Unexpected error encountered: ${err}`);
@@ -539,7 +588,7 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
 
         // If on another network other then the testnet our faucet serves test ether
         // from, we must show user an error message
-        if (this.props.blockchain.networkId !== constants.NETWORK_ID_TESTNET) {
+        if (this.props.blockchain.networkId !== constants.NETWORK_ID_KOVAN) {
             this.setState({
                 errorType: BalanceErrs.incorrectNetworkForFaucet,
             });
@@ -569,15 +618,11 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
                 isBalanceSpinnerVisible: true,
             });
         } else {
-            const tokens = _.values(this.props.tokenByAddress);
-            const zrxToken = _.find(tokens, t => t.symbol === ZRX_TOKEN_SYMBOL);
-            const zrxTokenState = this.props.tokenStateByAddress[zrxToken.address];
             this.setState({
                 isZRXSpinnerVisible: true,
-                currentZrxBalance: zrxTokenState.balance,
             });
             // tslint:disable-next-line:no-floating-promises
-            this.props.blockchain.pollTokenBalanceAsync(zrxToken);
+            this._startPollingZrxBalanceAsync();
         }
         return true;
     }
@@ -603,4 +648,65 @@ export class TokenBalances extends React.Component<TokenBalancesProps, TokenBala
             isAddingToken: false,
         });
     }
+    private async _startPollingZrxBalanceAsync() {
+        const tokens = _.values(this.props.tokenByAddress);
+        const zrxToken = _.find(tokens, t => t.symbol === ZRX_TOKEN_SYMBOL);
+
+        // tslint:disable-next-line:no-floating-promises
+        const balance = await this.props.blockchain.pollTokenBalanceAsync(zrxToken);
+        const trackedTokenStateByAddress = this.state.trackedTokenStateByAddress;
+        trackedTokenStateByAddress[zrxToken.address] = {
+            ...trackedTokenStateByAddress[zrxToken.address],
+            balance,
+        };
+        this.setState({
+            isZRXSpinnerVisible: false,
+        });
+    }
+    private async _fetchBalancesAndAllowancesAsync(tokenAddresses: string[]) {
+        const trackedTokenStateByAddress = this.state.trackedTokenStateByAddress;
+        for (const tokenAddress of tokenAddresses) {
+            const [balance, allowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
+                this.props.userAddress,
+                tokenAddress,
+            );
+            trackedTokenStateByAddress[tokenAddress] = {
+                balance,
+                allowance,
+                isLoaded: true,
+            };
+        }
+        if (!this._isUnmounted) {
+            this.setState({
+                trackedTokenStateByAddress,
+            });
+        }
+    }
+    private _getInitialTrackedTokenStateByAddress(trackedTokens: Token[]) {
+        const trackedTokenStateByAddress: TokenStateByAddress = {};
+        _.each(trackedTokens, token => {
+            trackedTokenStateByAddress[token.address] = {
+                balance: new BigNumber(0),
+                allowance: new BigNumber(0),
+                isLoaded: false,
+            };
+        });
+        return trackedTokenStateByAddress;
+    }
+    private async _refetchTokenStateAsync(tokenAddress: string) {
+        const [balance, allowance] = await this.props.blockchain.getTokenBalanceAndAllowanceAsync(
+            this.props.userAddress,
+            tokenAddress,
+        );
+        this.setState({
+            trackedTokenStateByAddress: {
+                ...this.state.trackedTokenStateByAddress,
+                [tokenAddress]: {
+                    balance,
+                    allowance,
+                    isLoaded: true,
+                },
+            },
+        });
+    }
 } // tslint:disable:max-file-line-count
diff --git a/packages/website/ts/components/top_bar/provider_display.tsx b/packages/website/ts/components/top_bar/provider_display.tsx
new file mode 100644
index 000000000..39e7f2a8c
--- /dev/null
+++ b/packages/website/ts/components/top_bar/provider_display.tsx
@@ -0,0 +1,148 @@
+import * as _ from 'lodash';
+import RaisedButton from 'material-ui/RaisedButton';
+import * as React from 'react';
+import { Blockchain } from 'ts/blockchain';
+import { ProviderPicker } from 'ts/components/top_bar/provider_picker';
+import { DropDown } from 'ts/components/ui/drop_down';
+import { Identicon } from 'ts/components/ui/identicon';
+import { Dispatcher } from 'ts/redux/dispatcher';
+import { ProviderType } from 'ts/types';
+import { colors } from 'ts/utils/colors';
+import { constants } from 'ts/utils/constants';
+import { utils } from 'ts/utils/utils';
+
+const IDENTICON_DIAMETER = 32;
+
+interface ProviderDisplayProps {
+    dispatcher: Dispatcher;
+    userAddress: string;
+    networkId: number;
+    injectedProviderName: string;
+    providerType: ProviderType;
+    onToggleLedgerDialog: () => void;
+    blockchain: Blockchain;
+}
+
+interface ProviderDisplayState {}
+
+export class ProviderDisplay extends React.Component<ProviderDisplayProps, ProviderDisplayState> {
+    public render() {
+        const isAddressAvailable = !_.isEmpty(this.props.userAddress);
+        const isExternallyInjectedProvider = ProviderType.Injected && this.props.injectedProviderName !== '0x Public';
+        const displayAddress = isAddressAvailable
+            ? utils.getAddressBeginAndEnd(this.props.userAddress)
+            : isExternallyInjectedProvider ? 'Account locked' : '0x0000...0000';
+        // If the "injected" provider is our fallback public node, then we want to
+        // show the "connect a wallet" message instead of the providerName
+        const injectedProviderName = isExternallyInjectedProvider
+            ? this.props.injectedProviderName
+            : 'Connect a wallet';
+        const providerTitle =
+            this.props.providerType === ProviderType.Injected ? injectedProviderName : 'Ledger Nano S';
+        const hoverActiveNode = (
+            <div className="flex right lg-pr0 md-pr2 sm-pr2" style={{ paddingTop: 16 }}>
+                <div>
+                    <Identicon address={this.props.userAddress} diameter={IDENTICON_DIAMETER} />
+                </div>
+                <div style={{ marginLeft: 12, paddingTop: 1 }}>
+                    <div style={{ fontSize: 12, color: colors.amber800 }}>{providerTitle}</div>
+                    <div style={{ fontSize: 14 }}>{displayAddress}</div>
+                </div>
+                <div
+                    style={{ borderLeft: `1px solid ${colors.grey300}`, marginLeft: 17, paddingTop: 1 }}
+                    className="px2"
+                >
+                    <i style={{ fontSize: 30, color: colors.grey300 }} className="zmdi zmdi zmdi-chevron-down" />
+                </div>
+            </div>
+        );
+        const hasInjectedProvider =
+            this.props.injectedProviderName !== '0x Public' && this.props.providerType === ProviderType.Injected;
+        const hasLedgerProvider = this.props.providerType === ProviderType.Ledger;
+        const horizontalPosition = hasInjectedProvider || hasLedgerProvider ? 'left' : 'middle';
+        return (
+            <div style={{ width: 'fit-content', height: 48, float: 'right' }}>
+                <DropDown
+                    hoverActiveNode={hoverActiveNode}
+                    popoverContent={this.renderPopoverContent(hasInjectedProvider, hasLedgerProvider)}
+                    anchorOrigin={{ horizontal: horizontalPosition, vertical: 'bottom' }}
+                    targetOrigin={{ horizontal: horizontalPosition, vertical: 'top' }}
+                    zDepth={1}
+                />
+            </div>
+        );
+    }
+    public renderPopoverContent(hasInjectedProvider: boolean, hasLedgerProvider: boolean) {
+        if (hasInjectedProvider || hasLedgerProvider) {
+            return (
+                <ProviderPicker
+                    dispatcher={this.props.dispatcher}
+                    networkId={this.props.networkId}
+                    injectedProviderName={this.props.injectedProviderName}
+                    providerType={this.props.providerType}
+                    onToggleLedgerDialog={this.props.onToggleLedgerDialog}
+                    blockchain={this.props.blockchain}
+                />
+            );
+        } else {
+            // Nothing to connect to, show install/info popover
+            return (
+                <div className="px2" style={{ maxWidth: 420 }}>
+                    <div className="center h4 py2" style={{ color: colors.grey700 }}>
+                        Choose a wallet:
+                    </div>
+                    <div className="flex pb3">
+                        <div className="center px2">
+                            <div style={{ color: colors.darkGrey }}>Install a browser wallet</div>
+                            <div className="py2">
+                                <img src="/images/metamask_or_parity.png" width="135" />
+                            </div>
+                            <div>
+                                Use{' '}
+                                <a
+                                    href={constants.URL_METAMASK_CHROME_STORE}
+                                    target="_blank"
+                                    style={{ color: colors.lightBlueA700 }}
+                                >
+                                    Metamask
+                                </a>{' '}
+                                or{' '}
+                                <a
+                                    href={constants.URL_PARITY_CHROME_STORE}
+                                    target="_blank"
+                                    style={{ color: colors.lightBlueA700 }}
+                                >
+                                    Parity Signer
+                                </a>
+                            </div>
+                        </div>
+                        <div>
+                            <div
+                                className="pl1 ml1"
+                                style={{ borderLeft: `1px solid ${colors.grey300}`, height: 65 }}
+                            />
+                            <div className="py1">or</div>
+                            <div
+                                className="pl1 ml1"
+                                style={{ borderLeft: `1px solid ${colors.grey300}`, height: 68 }}
+                            />
+                        </div>
+                        <div className="px2 center">
+                            <div style={{ color: colors.darkGrey }}>Connect to a ledger hardware wallet</div>
+                            <div style={{ paddingTop: 21, paddingBottom: 29 }}>
+                                <img src="/images/ledger_icon.png" style={{ width: 80 }} />
+                            </div>
+                            <div>
+                                <RaisedButton
+                                    style={{ width: '100%' }}
+                                    label="Use Ledger"
+                                    onClick={this.props.onToggleLedgerDialog}
+                                />
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            );
+        }
+    }
+}
diff --git a/packages/website/ts/components/top_bar/provider_picker.tsx b/packages/website/ts/components/top_bar/provider_picker.tsx
new file mode 100644
index 000000000..be7e57d6f
--- /dev/null
+++ b/packages/website/ts/components/top_bar/provider_picker.tsx
@@ -0,0 +1,81 @@
+import * as _ from 'lodash';
+import { RadioButton, RadioButtonGroup } from 'material-ui/RadioButton';
+import * as React from 'react';
+import { Blockchain } from 'ts/blockchain';
+import { Dispatcher } from 'ts/redux/dispatcher';
+import { ProviderType } from 'ts/types';
+import { colors } from 'ts/utils/colors';
+import { constants } from 'ts/utils/constants';
+
+interface ProviderPickerProps {
+    networkId: number;
+    injectedProviderName: string;
+    providerType: ProviderType;
+    onToggleLedgerDialog: () => void;
+    dispatcher: Dispatcher;
+    blockchain: Blockchain;
+}
+
+interface ProviderPickerState {}
+
+export class ProviderPicker extends React.Component<ProviderPickerProps, ProviderPickerState> {
+    public render() {
+        const isLedgerSelected = this.props.providerType === ProviderType.Ledger;
+        const menuStyle = {
+            padding: 10,
+            paddingTop: 15,
+            paddingBottom: 15,
+        };
+        // Show dropdown with two options
+        return (
+            <div style={{ width: 225, overflow: 'hidden' }}>
+                <RadioButtonGroup name="provider" defaultSelected={this.props.providerType}>
+                    <RadioButton
+                        onClick={this._onProviderRadioChanged.bind(this, ProviderType.Injected)}
+                        style={{ ...menuStyle, backgroundColor: !isLedgerSelected && colors.grey50 }}
+                        value={ProviderType.Injected}
+                        label={this._renderLabel(this.props.injectedProviderName, !isLedgerSelected)}
+                    />
+                    <RadioButton
+                        onClick={this._onProviderRadioChanged.bind(this, ProviderType.Ledger)}
+                        style={{ ...menuStyle, backgroundColor: isLedgerSelected && colors.grey50 }}
+                        value={ProviderType.Ledger}
+                        label={this._renderLabel('Ledger Nano S', isLedgerSelected)}
+                    />
+                </RadioButtonGroup>
+            </div>
+        );
+    }
+    private _renderLabel(title: string, shouldShowNetwork: boolean) {
+        const label = (
+            <div className="flex">
+                <div style={{ fontSize: 14 }}>{title}</div>
+                {shouldShowNetwork && this._renderNetwork()}
+            </div>
+        );
+        return label;
+    }
+    private _renderNetwork() {
+        const networkName = constants.NETWORK_NAME_BY_ID[this.props.networkId];
+        return (
+            <div className="flex" style={{ marginTop: 1 }}>
+                <div className="relative" style={{ width: 14, paddingLeft: 14 }}>
+                    <img
+                        src={`/images/network_icons/${networkName.toLowerCase()}.png`}
+                        className="absolute"
+                        style={{ top: 6, width: 10 }}
+                    />
+                </div>
+                <div style={{ color: colors.lightGrey, fontSize: 11 }}>{networkName}</div>
+            </div>
+        );
+    }
+    private _onProviderRadioChanged(value: string) {
+        if (value === ProviderType.Ledger) {
+            this.props.onToggleLedgerDialog();
+        } else {
+            // tslint:disable-next-line:no-floating-promises
+            this.props.blockchain.updateProviderToInjectedAsync();
+        }
+    }
+}
diff --git a/packages/website/ts/components/top_bar.tsx b/packages/website/ts/components/top_bar/top_bar.tsx
index 11d3e7cc2..1a0691e83 100644
--- a/packages/website/ts/components/top_bar.tsx
+++ b/packages/website/ts/components/top_bar/top_bar.tsx
@@ -1,21 +1,31 @@
 import * as _ from 'lodash';
 import Drawer from 'material-ui/Drawer';
+import Menu from 'material-ui/Menu';
 import MenuItem from 'material-ui/MenuItem';
 import * as React from 'react';
 import { Link } from 'react-router-dom';
 import ReactTooltip = require('react-tooltip');
+import { Blockchain } from 'ts/blockchain';
 import { PortalMenu } from 'ts/components/portal_menu';
-import { TopBarMenuItem } from 'ts/components/top_bar_menu_item';
-import { DropDownMenuItem } from 'ts/components/ui/drop_down_menu_item';
+import { ProviderDisplay } from 'ts/components/top_bar/provider_display';
+import { TopBarMenuItem } from 'ts/components/top_bar/top_bar_menu_item';
+import { DropDown } from 'ts/components/ui/drop_down';
 import { Identicon } from 'ts/components/ui/identicon';
 import { DocsInfo } from 'ts/pages/documentation/docs_info';
 import { NestedSidebarMenu } from 'ts/pages/shared/nested_sidebar_menu';
-import { DocsMenu, MenuSubsectionsBySection, Styles, WebsitePaths } from 'ts/types';
+import { Dispatcher } from 'ts/redux/dispatcher';
+import { DocsMenu, MenuSubsectionsBySection, ProviderType, Styles, WebsitePaths } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { constants } from 'ts/utils/constants';
 
 interface TopBarProps {
     userAddress?: string;
+    networkId?: number;
+    injectedProviderName?: string;
+    providerType?: ProviderType;
+    onToggleLedgerDialog?: () => void;
+    blockchain?: Blockchain;
+    dispatcher?: Dispatcher;
     blockchainIsLoaded: boolean;
     location: Location;
     docsVersion?: string;
@@ -125,6 +135,15 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
             cursor: 'pointer',
             paddingTop: 16,
         };
+        const hoverActiveNode = (
+            <div className="flex relative" style={{ color: menuIconStyle.color }}>
+                <div style={{ paddingRight: 10 }}>Developers</div>
+                <div className="absolute" style={{ paddingLeft: 3, right: 3, top: -2 }}>
+                    <i className="zmdi zmdi-caret-right" style={{ fontSize: 22 }} />
+                </div>
+            </div>
+        );
+        const popoverContent = <Menu style={{ color: colors.darkGrey }}>{developerSectionMenuItems}</Menu>;
         return (
             <div style={{ ...styles.topBar, ...bottomBorderStyle, ...this.props.style }} className="pb1">
                 <div className={parentClassNames}>
@@ -138,11 +157,12 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
                     {!this._isViewingPortal() && (
                         <div className={menuClasses}>
                             <div className="flex justify-between">
-                                <DropDownMenuItem
-                                    title="Developers"
-                                    subMenuItems={developerSectionMenuItems}
+                                <DropDown
+                                    hoverActiveNode={hoverActiveNode}
+                                    popoverContent={popoverContent}
+                                    anchorOrigin={{ horizontal: 'middle', vertical: 'bottom' }}
+                                    targetOrigin={{ horizontal: 'middle', vertical: 'top' }}
                                     style={styles.menuItem}
-                                    isNightVersion={isNightVersion}
                                 />
                                 <TopBarMenuItem
                                     title="Wiki"
@@ -167,10 +187,19 @@ export class TopBar extends React.Component<TopBarProps, TopBarState> {
                             </div>
                         </div>
                     )}
-                    {this.props.blockchainIsLoaded &&
-                        !_.isEmpty(this.props.userAddress) && (
-                            <div className="col col-5 sm-hide xs-hide">{this._renderUser()}</div>
-                        )}
+                    {this.props.blockchainIsLoaded && (
+                        <div className="sm-hide xs-hide col col-5">
+                            <ProviderDisplay
+                                dispatcher={this.props.dispatcher}
+                                userAddress={this.props.userAddress}
+                                networkId={this.props.networkId}
+                                injectedProviderName={this.props.injectedProviderName}
+                                providerType={this.props.providerType}
+                                onToggleLedgerDialog={this.props.onToggleLedgerDialog}
+                                blockchain={this.props.blockchain}
+                            />
+                        </div>
+                    )}
                     <div className={`col ${isFullWidthPage ? 'col-2 pl2' : 'col-1'} md-hide lg-hide`}>
                         <div style={menuIconStyle}>
                             <i className="zmdi zmdi-menu" onClick={this._onMenuButtonClick.bind(this)} />
diff --git a/packages/website/ts/components/top_bar_menu_item.tsx b/packages/website/ts/components/top_bar/top_bar_menu_item.tsx
index 96ee86142..96ee86142 100644
--- a/packages/website/ts/components/top_bar_menu_item.tsx
+++ b/packages/website/ts/components/top_bar/top_bar_menu_item.tsx
diff --git a/packages/website/ts/components/ui/drop_down_menu_item.tsx b/packages/website/ts/components/ui/drop_down.tsx
index a578fb4f9..63b9eec0b 100644
--- a/packages/website/ts/components/ui/drop_down_menu_item.tsx
+++ b/packages/website/ts/components/ui/drop_down.tsx
@@ -1,36 +1,35 @@
 import * as _ from 'lodash';
-import Menu from 'material-ui/Menu';
-import Popover from 'material-ui/Popover';
+import Popover, { PopoverAnimationVertical } from 'material-ui/Popover';
 import * as React from 'react';
-import { colors } from 'ts/utils/colors';
+import { MaterialUIPosition } from 'ts/types';
 
 const CHECK_CLOSE_POPOVER_INTERVAL_MS = 300;
 const DEFAULT_STYLE = {
     fontSize: 14,
 };
 
-interface DropDownMenuItemProps {
-    title: string;
-    subMenuItems: React.ReactNode[];
+interface DropDownProps {
+    hoverActiveNode: React.ReactNode;
+    popoverContent: React.ReactNode;
+    anchorOrigin: MaterialUIPosition;
+    targetOrigin: MaterialUIPosition;
     style?: React.CSSProperties;
-    menuItemStyle?: React.CSSProperties;
-    isNightVersion?: boolean;
+    zDepth?: number;
 }
 
-interface DropDownMenuItemState {
+interface DropDownState {
     isDropDownOpen: boolean;
     anchorEl?: HTMLInputElement;
 }
 
-export class DropDownMenuItem extends React.Component<DropDownMenuItemProps, DropDownMenuItemState> {
-    public static defaultProps: Partial<DropDownMenuItemProps> = {
+export class DropDown extends React.Component<DropDownProps, DropDownState> {
+    public static defaultProps: Partial<DropDownProps> = {
         style: DEFAULT_STYLE,
-        menuItemStyle: DEFAULT_STYLE,
-        isNightVersion: false,
+        zDepth: 1,
     };
     private _isHovering: boolean;
     private _popoverCloseCheckIntervalId: number;
-    constructor(props: DropDownMenuItemProps) {
+    constructor(props: DropDownProps) {
         super(props);
         this.state = {
             isDropDownOpen: false,
@@ -44,30 +43,35 @@ export class DropDownMenuItem extends React.Component<DropDownMenuItemProps, Dro
     public componentWillUnmount() {
         window.clearInterval(this._popoverCloseCheckIntervalId);
     }
+    public componentWillReceiveProps(nextProps: DropDownProps) {
+        // HACK: If the popoverContent is updated to a different dimension and the users
+        // mouse is no longer above it, the dropdown can enter an inconsistent state where
+        // it believes the user is still hovering over it. In order to remedy this, we
+        // call hoverOff whenever the dropdown receives updated props. This is a hack
+        // because it will effectively close the dropdown on any prop update, barring
+        // dropdowns from having dynamic content.
+        this._onHoverOff();
+    }
     public render() {
-        const colorStyle = this.props.isNightVersion ? 'white' : this.props.style.color;
         return (
             <div
-                style={{ ...this.props.style, color: colorStyle }}
+                style={{ ...this.props.style, width: 'fit-content', height: '100%' }}
                 onMouseEnter={this._onHover.bind(this)}
                 onMouseLeave={this._onHoverOff.bind(this)}
             >
-                <div className="flex relative">
-                    <div style={{ paddingRight: 10 }}>{this.props.title}</div>
-                    <div className="absolute" style={{ paddingLeft: 3, right: 3, top: -2 }}>
-                        <i className="zmdi zmdi-caret-right" style={{ fontSize: 22 }} />
-                    </div>
-                </div>
+                {this.props.hoverActiveNode}
                 <Popover
                     open={this.state.isDropDownOpen}
                     anchorEl={this.state.anchorEl}
-                    anchorOrigin={{ horizontal: 'middle', vertical: 'bottom' }}
-                    targetOrigin={{ horizontal: 'middle', vertical: 'top' }}
+                    anchorOrigin={this.props.anchorOrigin}
+                    targetOrigin={this.props.targetOrigin}
                     onRequestClose={this._closePopover.bind(this)}
                     useLayerForClickAway={false}
+                    animation={PopoverAnimationVertical}
+                    zDepth={this.props.zDepth}
                 >
                     <div onMouseEnter={this._onHover.bind(this)} onMouseLeave={this._onHoverOff.bind(this)}>
-                        <Menu style={{ color: colors.grey }}>{this.props.subMenuItems}</Menu>
+                        {this.props.popoverContent}
                     </div>
                 </Popover>
             </div>
@@ -87,7 +91,7 @@ export class DropDownMenuItem extends React.Component<DropDownMenuItemProps, Dro
             anchorEl: event.currentTarget,
         });
     }
-    private _onHoverOff(event: React.FormEvent<HTMLInputElement>) {
+    private _onHoverOff() {
         this._isHovering = false;
     }
     private _checkIfShouldClosePopover() {
diff --git a/packages/website/ts/components/ui/loading.tsx b/packages/website/ts/components/ui/loading.tsx
deleted file mode 100644
index aa319e9e9..000000000
--- a/packages/website/ts/components/ui/loading.tsx
+++ /dev/null
@@ -1,39 +0,0 @@
-import * as _ from 'lodash';
-import Paper from 'material-ui/Paper';
-import * as React from 'react';
-import { DefaultPlayer as Video } from 'react-html5video';
-import 'react-html5video/dist/styles.css';
-import { utils } from 'ts/utils/utils';
-
-interface LoadingProps {}
-
-interface LoadingState {}
-
-export class Loading extends React.Component<LoadingProps, LoadingState> {
-    public render() {
-        return (
-            <div className="pt4 sm-px2 sm-pt2 sm-m1" style={{ height: 500 }}>
-                <Paper className="mx-auto" style={{ maxWidth: 400 }}>
-                    {utils.isUserOnMobile() ? (
-                        <img className="p1" src="/gifs/0xAnimation.gif" width="96%" />
-                    ) : (
-                        <div style={{ pointerEvents: 'none' }}>
-                            <Video
-                                autoPlay={true}
-                                loop={true}
-                                muted={true}
-                                controls={[]}
-                                poster="/images/loading_poster.png"
-                            >
-                                <source src="/videos/0xAnimation.mp4" type="video/mp4" />
-                            </Video>
-                        </div>
-                    )}
-                    <div className="center pt2" style={{ paddingBottom: 11 }}>
-                        Connecting to the blockchain...
-                    </div>
-                </Paper>
-            </div>
-        );
-    }
-}
diff --git a/packages/website/ts/containers/generate_order_form.tsx b/packages/website/ts/containers/generate_order_form.tsx
index 3fd31087f..57863dbae 100644
--- a/packages/website/ts/containers/generate_order_form.tsx
+++ b/packages/website/ts/containers/generate_order_form.tsx
@@ -6,14 +6,7 @@ import { Blockchain } from 'ts/blockchain';
 import { GenerateOrderForm as GenerateOrderFormComponent } from 'ts/components/generate_order/generate_order_form';
 import { Dispatcher } from 'ts/redux/dispatcher';
 import { State } from 'ts/redux/reducer';
-import {
-    BlockchainErrs,
-    HashData,
-    SideToAssetToken,
-    SignatureData,
-    TokenByAddress,
-    TokenStateByAddress,
-} from 'ts/types';
+import { BlockchainErrs, HashData, SideToAssetToken, SignatureData, TokenByAddress } from 'ts/types';
 
 interface GenerateOrderFormProps {
     blockchain: Blockchain;
@@ -32,7 +25,7 @@ interface ConnectedState {
     networkId: number;
     sideToAssetToken: SideToAssetToken;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
+    lastForceTokenStateRefetch: number;
 }
 
 const mapStateToProps = (state: State, ownProps: GenerateOrderFormProps): ConnectedState => ({
@@ -45,8 +38,8 @@ const mapStateToProps = (state: State, ownProps: GenerateOrderFormProps): Connec
     networkId: state.networkId,
     sideToAssetToken: state.sideToAssetToken,
     tokenByAddress: state.tokenByAddress,
-    tokenStateByAddress: state.tokenStateByAddress,
     userAddress: state.userAddress,
+    lastForceTokenStateRefetch: state.lastForceTokenStateRefetch,
 });
 
 export const GenerateOrderForm: React.ComponentClass<GenerateOrderFormProps> = connect(mapStateToProps)(
diff --git a/packages/website/ts/containers/portal.tsx b/packages/website/ts/containers/portal.tsx
index f0247935b..bcca0d70f 100644
--- a/packages/website/ts/containers/portal.tsx
+++ b/packages/website/ts/containers/portal.tsx
@@ -6,18 +6,20 @@ import { Dispatch } from 'redux';
 import { Portal as PortalComponent, PortalAllProps as PortalComponentAllProps } from 'ts/components/portal';
 import { Dispatcher } from 'ts/redux/dispatcher';
 import { State } from 'ts/redux/reducer';
-import { BlockchainErrs, HashData, Order, ScreenWidths, Side, TokenByAddress, TokenStateByAddress } from 'ts/types';
+import { BlockchainErrs, HashData, Order, ProviderType, ScreenWidths, Side, TokenByAddress } from 'ts/types';
 import { constants } from 'ts/utils/constants';
 
 interface ConnectedState {
     blockchainErr: BlockchainErrs;
     blockchainIsLoaded: boolean;
     hashData: HashData;
+    injectedProviderName: string;
     networkId: number;
     nodeVersion: string;
     orderFillAmount: BigNumber;
+    providerType: ProviderType;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
+    lastForceTokenStateRefetch: number;
     userEtherBalance: BigNumber;
     screenWidth: ScreenWidths;
     shouldBlockchainErrDialogBeOpen: boolean;
@@ -57,14 +59,16 @@ const mapStateToProps = (state: State, ownProps: PortalComponentAllProps): Conne
     return {
         blockchainErr: state.blockchainErr,
         blockchainIsLoaded: state.blockchainIsLoaded,
+        hashData,
+        injectedProviderName: state.injectedProviderName,
         networkId: state.networkId,
         nodeVersion: state.nodeVersion,
         orderFillAmount: state.orderFillAmount,
-        hashData,
+        providerType: state.providerType,
         screenWidth: state.screenWidth,
         shouldBlockchainErrDialogBeOpen: state.shouldBlockchainErrDialogBeOpen,
         tokenByAddress: state.tokenByAddress,
-        tokenStateByAddress: state.tokenStateByAddress,
+        lastForceTokenStateRefetch: state.lastForceTokenStateRefetch,
         userAddress: state.userAddress,
         userEtherBalance: state.userEtherBalance,
         userSuppliedOrderCache: state.userSuppliedOrderCache,
diff --git a/packages/website/ts/globals.d.ts b/packages/website/ts/globals.d.ts
index 383e5cbe0..d7f887c6d 100644
--- a/packages/website/ts/globals.d.ts
+++ b/packages/website/ts/globals.d.ts
@@ -10,7 +10,6 @@ declare module 'thenby';
 declare module 'react-highlight';
 declare module 'react-recaptcha';
 declare module 'react-document-title';
-declare module 'ledgerco';
 declare module 'ethereumjs-tx';
 
 declare module '*.json' {
diff --git a/packages/website/ts/local_storage/tracked_token_storage.ts b/packages/website/ts/local_storage/tracked_token_storage.ts
index 7733e8436..f865f8109 100644
--- a/packages/website/ts/local_storage/tracked_token_storage.ts
+++ b/packages/website/ts/local_storage/tracked_token_storage.ts
@@ -1,6 +1,6 @@
 import * as _ from 'lodash';
 import { localStorage } from 'ts/local_storage/local_storage';
-import { Token, TrackedTokensByUserAddress } from 'ts/types';
+import { Token, TokenByAddress, TrackedTokensByUserAddress } from 'ts/types';
 import { configs } from 'ts/utils/configs';
 
 const TRACKED_TOKENS_KEY = 'trackedTokens';
@@ -39,18 +39,22 @@ export const trackedTokenStorage = {
         const trackedTokensByUserAddress = JSON.parse(trackedTokensJSONString);
         return trackedTokensByUserAddress;
     },
-    getTrackedTokensIfExists(userAddress: string, networkId: number): Token[] {
+    getTrackedTokensByAddress(userAddress: string, networkId: number): TokenByAddress {
+        const trackedTokensByAddress: TokenByAddress = {};
         const trackedTokensJSONString = localStorage.getItemIfExists(TRACKED_TOKENS_KEY);
         if (_.isEmpty(trackedTokensJSONString)) {
-            return undefined;
+            return trackedTokensByAddress;
         }
         const trackedTokensByUserAddress = JSON.parse(trackedTokensJSONString);
         const trackedTokensByNetworkId = trackedTokensByUserAddress[userAddress];
         if (_.isUndefined(trackedTokensByNetworkId)) {
-            return undefined;
+            return trackedTokensByAddress;
         }
         const trackedTokens = trackedTokensByNetworkId[networkId];
-        return trackedTokens;
+        _.each(trackedTokens, (trackedToken: Token) => {
+            trackedTokensByAddress[trackedToken.address] = trackedToken;
+        });
+        return trackedTokensByAddress;
     },
     removeTrackedToken(userAddress: string, networkId: number, tokenAddress: string): void {
         const trackedTokensByUserAddress = this.getTrackedTokensByUserAddress();
diff --git a/packages/website/ts/pages/about/about.tsx b/packages/website/ts/pages/about/about.tsx
index c929673f5..0889e79f3 100644
--- a/packages/website/ts/pages/about/about.tsx
+++ b/packages/website/ts/pages/about/about.tsx
@@ -2,7 +2,7 @@ import * as _ from 'lodash';
 import * as React from 'react';
 import * as DocumentTitle from 'react-document-title';
 import { Footer } from 'ts/components/footer';
-import { TopBar } from 'ts/components/top_bar';
+import { TopBar } from 'ts/components/top_bar/top_bar';
 import { Profile } from 'ts/pages/about/profile';
 import { ProfileInfo, Styles } from 'ts/types';
 import { colors } from 'ts/utils/colors';
diff --git a/packages/website/ts/pages/documentation/documentation.tsx b/packages/website/ts/pages/documentation/documentation.tsx
index 2315847ad..7ad1d3b9c 100644
--- a/packages/website/ts/pages/documentation/documentation.tsx
+++ b/packages/website/ts/pages/documentation/documentation.tsx
@@ -5,7 +5,7 @@ import * as React from 'react';
 import DocumentTitle = require('react-document-title');
 import { scroller } from 'react-scroll';
 import semverSort = require('semver-sort');
-import { TopBar } from 'ts/components/top_bar';
+import { TopBar } from 'ts/components/top_bar/top_bar';
 import { Badge } from 'ts/components/ui/badge';
 import { Comment } from 'ts/pages/documentation/comment';
 import { DocsInfo } from 'ts/pages/documentation/docs_info';
@@ -40,9 +40,9 @@ import { utils } from 'ts/utils/utils';
 const SCROLL_TOP_ID = 'docsScrollTop';
 
 const networkNameToColor: { [network: string]: string } = {
-    [Networks.kovan]: colors.purple,
-    [Networks.ropsten]: colors.red,
-    [Networks.mainnet]: colors.turquois,
+    [Networks.Kovan]: colors.purple,
+    [Networks.Ropsten]: colors.red,
+    [Networks.Mainnet]: colors.turquois,
 };
 
 export interface DocumentationAllProps {
@@ -78,8 +78,10 @@ const styles: Styles = {
 };
 
 export class Documentation extends React.Component<DocumentationAllProps, DocumentationState> {
+    private _isUnmounted: boolean;
     constructor(props: DocumentationAllProps) {
         super(props);
+        this._isUnmounted = false;
         this.state = {
             docAgnosticFormat: undefined,
         };
@@ -92,6 +94,9 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
         // tslint:disable-next-line:no-floating-promises
         this._fetchJSONDocsFireAndForgetAsync(preferredVersionIfExists);
     }
+    public componentWillUnmount() {
+        this._isUnmounted = true;
+    }
     public render() {
         const menuSubsectionsBySection = _.isUndefined(this.state.docAgnosticFormat)
             ? {}
@@ -367,13 +372,15 @@ export class Documentation extends React.Component<DocumentationAllProps, Docume
         );
         const docAgnosticFormat = this.props.docsInfo.convertToDocAgnosticFormat(versionDocObj as DoxityDocObj);
 
-        this.setState(
-            {
-                docAgnosticFormat,
-            },
-            () => {
-                this._scrollToHash();
-            },
-        );
+        if (!this._isUnmounted) {
+            this.setState(
+                {
+                    docAgnosticFormat,
+                },
+                () => {
+                    this._scrollToHash();
+                },
+            );
+        }
     }
 }
diff --git a/packages/website/ts/pages/faq/faq.tsx b/packages/website/ts/pages/faq/faq.tsx
index b4b5214a2..0a7eecc2d 100644
--- a/packages/website/ts/pages/faq/faq.tsx
+++ b/packages/website/ts/pages/faq/faq.tsx
@@ -2,7 +2,7 @@ import * as _ from 'lodash';
 import * as React from 'react';
 import * as DocumentTitle from 'react-document-title';
 import { Footer } from 'ts/components/footer';
-import { TopBar } from 'ts/components/top_bar';
+import { TopBar } from 'ts/components/top_bar/top_bar';
 import { Question } from 'ts/pages/faq/question';
 import { FAQQuestion, FAQSection, Styles, WebsitePaths } from 'ts/types';
 import { colors } from 'ts/utils/colors';
diff --git a/packages/website/ts/pages/landing/landing.tsx b/packages/website/ts/pages/landing/landing.tsx
index ca76497df..b0c622fb4 100644
--- a/packages/website/ts/pages/landing/landing.tsx
+++ b/packages/website/ts/pages/landing/landing.tsx
@@ -4,7 +4,7 @@ import * as React from 'react';
 import DocumentTitle = require('react-document-title');
 import { Link } from 'react-router-dom';
 import { Footer } from 'ts/components/footer';
-import { TopBar } from 'ts/components/top_bar';
+import { TopBar } from 'ts/components/top_bar/top_bar';
 import { ScreenWidths, WebsitePaths } from 'ts/types';
 import { colors } from 'ts/utils/colors';
 import { constants } from 'ts/utils/constants';
diff --git a/packages/website/ts/pages/not_found.tsx b/packages/website/ts/pages/not_found.tsx
index ff277c377..0a6ec071c 100644
--- a/packages/website/ts/pages/not_found.tsx
+++ b/packages/website/ts/pages/not_found.tsx
@@ -1,7 +1,7 @@
 import * as _ from 'lodash';
 import * as React from 'react';
 import { Footer } from 'ts/components/footer';
-import { TopBar } from 'ts/components/top_bar';
+import { TopBar } from 'ts/components/top_bar/top_bar';
 import { Styles } from 'ts/types';
 
 export interface NotFoundProps {
diff --git a/packages/website/ts/pages/wiki/wiki.tsx b/packages/website/ts/pages/wiki/wiki.tsx
index d065614ba..daf5c27a7 100644
--- a/packages/website/ts/pages/wiki/wiki.tsx
+++ b/packages/website/ts/pages/wiki/wiki.tsx
@@ -3,7 +3,7 @@ import CircularProgress from 'material-ui/CircularProgress';
 import * as React from 'react';
 import DocumentTitle = require('react-document-title');
 import { scroller } from 'react-scroll';
-import { TopBar } from 'ts/components/top_bar';
+import { TopBar } from 'ts/components/top_bar/top_bar';
 import { MarkdownSection } from 'ts/pages/shared/markdown_section';
 import { NestedSidebarMenu } from 'ts/pages/shared/nested_sidebar_menu';
 import { SectionHeader } from 'ts/pages/shared/section_header';
@@ -45,8 +45,10 @@ const styles: Styles = {
 
 export class Wiki extends React.Component<WikiProps, WikiState> {
     private _wikiBackoffTimeoutId: number;
+    private _isUnmounted: boolean;
     constructor(props: WikiProps) {
         super(props);
+        this._isUnmounted = false;
         this.state = {
             articlesBySection: undefined,
         };
@@ -56,6 +58,7 @@ export class Wiki extends React.Component<WikiProps, WikiState> {
         this._fetchArticlesBySectionAsync();
     }
     public componentWillUnmount() {
+        this._isUnmounted = true;
         clearTimeout(this._wikiBackoffTimeoutId);
     }
     public render() {
@@ -179,14 +182,16 @@ export class Wiki extends React.Component<WikiProps, WikiState> {
             return;
         }
         const articlesBySection = await response.json();
-        this.setState(
-            {
-                articlesBySection,
-            },
-            () => {
-                this._scrollToHash();
-            },
-        );
+        if (!this._isUnmounted) {
+            this.setState(
+                {
+                    articlesBySection,
+                },
+                () => {
+                    this._scrollToHash();
+                },
+            );
+        }
     }
     private _getMenuSubsectionsBySection(articlesBySection: ArticlesBySection) {
         const sectionNames = _.keys(articlesBySection);
diff --git a/packages/website/ts/redux/dispatcher.ts b/packages/website/ts/redux/dispatcher.ts
index 42989e5e1..87415b285 100644
--- a/packages/website/ts/redux/dispatcher.ts
+++ b/packages/website/ts/redux/dispatcher.ts
@@ -9,9 +9,10 @@ import {
     ProviderType,
     ScreenWidths,
     Side,
+    SideToAssetToken,
     SignatureData,
     Token,
-    TokenStateByAddress,
+    TokenByAddress,
 } from 'ts/types';
 
 export class Dispatcher {
@@ -120,9 +121,20 @@ export class Dispatcher {
             type: ActionTypes.RemoveTokenFromTokenByAddress,
         });
     }
-    public clearTokenByAddress() {
+    public batchDispatch(
+        tokenByAddress: TokenByAddress,
+        networkId: number,
+        userAddress: string,
+        sideToAssetToken: SideToAssetToken,
+    ) {
         this._dispatch({
-            type: ActionTypes.ClearTokenByAddress,
+            data: {
+                tokenByAddress,
+                networkId,
+                userAddress,
+                sideToAssetToken,
+            },
+            type: ActionTypes.BatchDispatch,
         });
     }
     public updateTokenByAddress(tokens: Token[]) {
@@ -131,43 +143,9 @@ export class Dispatcher {
             type: ActionTypes.UpdateTokenByAddress,
         });
     }
-    public updateTokenStateByAddress(tokenStateByAddress: TokenStateByAddress) {
-        this._dispatch({
-            data: tokenStateByAddress,
-            type: ActionTypes.UpdateTokenStateByAddress,
-        });
-    }
-    public removeFromTokenStateByAddress(tokenAddress: string) {
-        this._dispatch({
-            data: tokenAddress,
-            type: ActionTypes.RemoveFromTokenStateByAddress,
-        });
-    }
-    public replaceTokenAllowanceByAddress(address: string, allowance: BigNumber) {
+    public forceTokenStateRefetch() {
         this._dispatch({
-            data: {
-                address,
-                allowance,
-            },
-            type: ActionTypes.ReplaceTokenAllowanceByAddress,
-        });
-    }
-    public replaceTokenBalanceByAddress(address: string, balance: BigNumber) {
-        this._dispatch({
-            data: {
-                address,
-                balance,
-            },
-            type: ActionTypes.ReplaceTokenBalanceByAddress,
-        });
-    }
-    public updateTokenBalanceByAddress(address: string, balanceDelta: BigNumber) {
-        this._dispatch({
-            data: {
-                address,
-                balanceDelta,
-            },
-            type: ActionTypes.UpdateTokenBalanceByAddress,
+            type: ActionTypes.ForceTokenStateRefetch,
         });
     }
     public updateSignatureData(signatureData: SignatureData) {
diff --git a/packages/website/ts/redux/reducer.ts b/packages/website/ts/redux/reducer.ts
index 06ac8b670..7b0b03dae 100644
--- a/packages/website/ts/redux/reducer.ts
+++ b/packages/website/ts/redux/reducer.ts
@@ -1,6 +1,7 @@
 import { ZeroEx } from '0x.js';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
+import * as moment from 'moment';
 import {
     Action,
     ActionTypes,
@@ -12,8 +13,6 @@ import {
     SideToAssetToken,
     SignatureData,
     TokenByAddress,
-    TokenState,
-    TokenStateByAddress,
 } from 'ts/types';
 import { utils } from 'ts/utils/utils';
 
@@ -37,7 +36,7 @@ export interface State {
     shouldBlockchainErrDialogBeOpen: boolean;
     sideToAssetToken: SideToAssetToken;
     tokenByAddress: TokenByAddress;
-    tokenStateByAddress: TokenStateByAddress;
+    lastForceTokenStateRefetch: number;
     userAddress: string;
     userEtherBalance: BigNumber;
     // Note: cache of supplied orderJSON in fill order step. Do not use for anything else.
@@ -76,7 +75,7 @@ const INITIAL_STATE: State = {
         [Side.Receive]: {},
     },
     tokenByAddress: {},
-    tokenStateByAddress: {},
+    lastForceTokenStateRefetch: moment().unix(),
     userAddress: '',
     userEtherBalance: new BigNumber(0),
     userSuppliedOrderCache: undefined,
@@ -139,13 +138,6 @@ export function reducer(state: State = INITIAL_STATE, action: Action) {
             };
         }
 
-        case ActionTypes.ClearTokenByAddress: {
-            return {
-                ...state,
-                tokenByAddress: {},
-            };
-        }
-
         case ActionTypes.AddTokenToTokenByAddress: {
             const newTokenByAddress = state.tokenByAddress;
             newTokenByAddress[action.data.address] = action.data;
@@ -180,74 +172,21 @@ export function reducer(state: State = INITIAL_STATE, action: Action) {
             };
         }
 
-        case ActionTypes.UpdateTokenStateByAddress: {
-            const tokenStateByAddress = state.tokenStateByAddress;
-            const updatedTokenStateByAddress = action.data;
-            _.each(updatedTokenStateByAddress, (tokenState: TokenState, address: string) => {
-                const updatedTokenState = {
-                    ...tokenStateByAddress[address],
-                    ...tokenState,
-                };
-                tokenStateByAddress[address] = updatedTokenState;
-            });
-            return {
-                ...state,
-                tokenStateByAddress,
-            };
-        }
-
-        case ActionTypes.RemoveFromTokenStateByAddress: {
-            const tokenStateByAddress = state.tokenStateByAddress;
-            const tokenAddress = action.data;
-            delete tokenStateByAddress[tokenAddress];
-            return {
-                ...state,
-                tokenStateByAddress,
-            };
-        }
-
-        case ActionTypes.ReplaceTokenAllowanceByAddress: {
-            const tokenStateByAddress = state.tokenStateByAddress;
-            const allowance = action.data.allowance;
-            const tokenAddress = action.data.address;
-            tokenStateByAddress[tokenAddress] = {
-                ...tokenStateByAddress[tokenAddress],
-                allowance,
-            };
+        case ActionTypes.BatchDispatch: {
             return {
                 ...state,
-                tokenStateByAddress,
+                networkId: action.data.networkId,
+                userAddress: action.data.userAddress,
+                sideToAssetToken: action.data.sideToAssetToken,
+                tokenByAddress: action.data.tokenByAddress,
             };
         }
 
-        case ActionTypes.ReplaceTokenBalanceByAddress: {
-            const tokenStateByAddress = state.tokenStateByAddress;
-            const balance = action.data.balance;
-            const tokenAddress = action.data.address;
-            tokenStateByAddress[tokenAddress] = {
-                ...tokenStateByAddress[tokenAddress],
-                balance,
-            };
+        case ActionTypes.ForceTokenStateRefetch:
             return {
                 ...state,
-                tokenStateByAddress,
+                lastForceTokenStateRefetch: moment().unix(),
             };
-        }
-
-        case ActionTypes.UpdateTokenBalanceByAddress: {
-            const tokenStateByAddress = state.tokenStateByAddress;
-            const balanceDelta = action.data.balanceDelta;
-            const tokenAddress = action.data.address;
-            const currBalance = tokenStateByAddress[tokenAddress].balance;
-            tokenStateByAddress[tokenAddress] = {
-                ...tokenStateByAddress[tokenAddress],
-                balance: currBalance.plus(balanceDelta),
-            };
-            return {
-                ...state,
-                tokenStateByAddress,
-            };
-        }
 
         case ActionTypes.UpdateOrderSignatureData: {
             return {
diff --git a/packages/website/ts/types.ts b/packages/website/ts/types.ts
index f873f95fa..c48c88cae 100644
--- a/packages/website/ts/types.ts
+++ b/packages/website/ts/types.ts
@@ -25,10 +25,6 @@ export interface TokenState {
     balance: BigNumber;
 }
 
-export interface TokenStateByAddress {
-    [address: string]: TokenState;
-}
-
 export interface AssetToken {
     address?: string;
     amount?: BigNumber;
@@ -110,12 +106,12 @@ export enum BalanceErrs {
 
 export enum ActionTypes {
     // Portal
+    BatchDispatch = 'BATCH_DISPATCH',
     UpdateScreenWidth = 'UPDATE_SCREEN_WIDTH',
     UpdateNodeVersion = 'UPDATE_NODE_VERSION',
     ResetState = 'RESET_STATE',
     AddTokenToTokenByAddress = 'ADD_TOKEN_TO_TOKEN_BY_ADDRESS',
     BlockchainErrEncountered = 'BLOCKCHAIN_ERR_ENCOUNTERED',
-    ClearTokenByAddress = 'CLEAR_TOKEN_BY_ADDRESS',
     UpdateBlockchainIsLoaded = 'UPDATE_BLOCKCHAIN_IS_LOADED',
     UpdateNetworkId = 'UPDATE_NETWORK_ID',
     UpdateChosenAssetToken = 'UPDATE_CHOSEN_ASSET_TOKEN',
@@ -125,11 +121,7 @@ export enum ActionTypes {
     UpdateOrderSignatureData = 'UPDATE_ORDER_SIGNATURE_DATA',
     UpdateTokenByAddress = 'UPDATE_TOKEN_BY_ADDRESS',
     RemoveTokenFromTokenByAddress = 'REMOVE_TOKEN_FROM_TOKEN_BY_ADDRESS',
-    UpdateTokenStateByAddress = 'UPDATE_TOKEN_STATE_BY_ADDRESS',
-    RemoveFromTokenStateByAddress = 'REMOVE_FROM_TOKEN_STATE_BY_ADDRESS',
-    ReplaceTokenAllowanceByAddress = 'REPLACE_TOKEN_ALLOWANCE_BY_ADDRESS',
-    ReplaceTokenBalanceByAddress = 'REPLACE_TOKEN_BALANCE_BY_ADDRESS',
-    UpdateTokenBalanceByAddress = 'UPDATE_TOKEN_BALANCE_BY_ADDRESS',
+    ForceTokenStateRefetch = 'FORCE_TOKEN_STATE_REFETCH',
     UpdateOrderExpiry = 'UPDATE_ORDER_EXPIRY',
     SwapAssetTokens = 'SWAP_ASSET_TOKENS',
     UpdateUserAddress = 'UPDATE_USER_ADDRESS',
@@ -496,16 +488,6 @@ export interface SignPersonalMessageParams {
     data: string;
 }
 
-export interface TxParams {
-    nonce: string;
-    gasPrice?: number;
-    gasLimit: string;
-    to: string;
-    value?: string;
-    data?: string;
-    chainId: number; // EIP 155 chainId - mainnet: 1, ropsten: 3
-}
-
 export interface PublicNodeUrlsByNetworkId {
     [networkId: number]: string[];
 }
@@ -610,10 +592,10 @@ export interface AddressByContractName {
 }
 
 export enum Networks {
-    mainnet = 'Mainnet',
-    kovan = 'Kovan',
-    ropsten = 'Ropsten',
-    rinkeby = 'Rinkeby',
+    Mainnet = 'Mainnet',
+    Kovan = 'Kovan',
+    Ropsten = 'Ropsten',
+    Rinkeby = 'Rinkeby',
 }
 
 export enum AbiTypes {
@@ -678,4 +660,9 @@ export enum SmartContractDocSections {
     ZRXToken = 'ZRXToken',
 }
 
+export interface MaterialUIPosition {
+    vertical: 'bottom' | 'top' | 'center';
+    horizontal: 'left' | 'middle' | 'right';
+}
+
 // tslint:disable:max-file-line-count
diff --git a/packages/website/ts/utils/configs.ts b/packages/website/ts/utils/configs.ts
index 3d37a89ab..874ad04c2 100644
--- a/packages/website/ts/utils/configs.ts
+++ b/packages/website/ts/utils/configs.ts
@@ -16,24 +16,24 @@ const isDevelopment = _.includes(
 const INFURA_API_KEY = 'T5WSC8cautR4KXyYgsRs';
 
 export const configs = {
-    BACKEND_BASE_URL: isDevelopment ? 'https://localhost:3001' : 'https://website-api.0xproject.com',
+    BACKEND_BASE_URL: 'https://website-api.0xproject.com',
     BASE_URL,
     BITLY_ACCESS_TOKEN: 'ffc4c1a31e5143848fb7c523b39f91b9b213d208',
     CONTRACT_ADDRESS: {
         '1.0.0': {
-            [Networks.mainnet]: {
+            [Networks.Mainnet]: {
                 [SmartContractDocSections.Exchange]: '0x12459c951127e0c374ff9105dda097662a027093',
                 [SmartContractDocSections.TokenTransferProxy]: '0x8da0d80f5007ef1e431dd2127178d224e32c2ef4',
                 [SmartContractDocSections.ZRXToken]: '0xe41d2489571d322189246dafa5ebde1f4699f498',
                 [SmartContractDocSections.TokenRegistry]: '0x926a74c5c36adf004c87399e65f75628b0f98d2c',
             },
-            [Networks.ropsten]: {
+            [Networks.Ropsten]: {
                 [SmartContractDocSections.Exchange]: '0x479cc461fecd078f766ecc58533d6f69580cf3ac',
                 [SmartContractDocSections.TokenTransferProxy]: '0x4e9aad8184de8833365fea970cd9149372fdf1e6',
                 [SmartContractDocSections.ZRXToken]: '0xa8e9fa8f91e5ae138c74648c9c304f1c75003a8d',
                 [SmartContractDocSections.TokenRegistry]: '0x6b1a50f0bb5a7995444bd3877b22dc89c62843ed',
             },
-            [Networks.kovan]: {
+            [Networks.Kovan]: {
                 [SmartContractDocSections.Exchange]: '0x90fe2af704b34e0224bf2299c838e04d4dcf1364',
                 [SmartContractDocSections.TokenTransferProxy]: '0x087Eed4Bc1ee3DE49BeFbd66C662B434B15d49d4',
                 [SmartContractDocSections.ZRXToken]: '0x6ff6c0ff1d68b964901f986d4c9fa3ac68346570',
@@ -120,6 +120,8 @@ export const configs = {
     PUBLIC_NODE_URLS_BY_NETWORK_ID: {
         [1]: [`https://mainnet.infura.io/${INFURA_API_KEY}`, 'https://mainnet.0xproject.com'],
         [42]: [`https://kovan.infura.io/${INFURA_API_KEY}`, 'https://kovan.0xproject.com'],
+        [3]: [`https://ropsten.infura.io/${INFURA_API_KEY}`],
+        [4]: [`https://rinkeby.infura.io/${INFURA_API_KEY}`],
     } as PublicNodeUrlsByNetworkId,
     SHOULD_DEPRECATE_OLD_WETH_TOKEN: true,
     SYMBOLS_OF_MINTABLE_TOKENS: ['MKR', 'MLN', 'GNT', 'DGD', 'REP'],
diff --git a/packages/website/ts/utils/constants.ts b/packages/website/ts/utils/constants.ts
index dded82114..26a793f38 100644
--- a/packages/website/ts/utils/constants.ts
+++ b/packages/website/ts/utils/constants.ts
@@ -10,6 +10,8 @@ export const constants = {
         1: 4145578,
         42: 3117574,
         50: 0,
+        3: 1719261,
+        4: 1570919,
     } as { [networkId: number]: number },
     HOME_SCROLL_DURATION_MS: 500,
     HTTP_NO_CONTENT_STATUS_CODE: 204,
@@ -19,19 +21,19 @@ export const constants = {
     MAINNET_NAME: 'Main network',
     MINT_AMOUNT: new BigNumber('100000000000000000000'),
     NETWORK_ID_MAINNET: 1,
-    NETWORK_ID_TESTNET: 42,
+    NETWORK_ID_KOVAN: 42,
     NETWORK_ID_TESTRPC: 50,
     NETWORK_NAME_BY_ID: {
-        1: Networks.mainnet,
-        3: Networks.ropsten,
-        4: Networks.rinkeby,
-        42: Networks.kovan,
+        1: Networks.Mainnet,
+        3: Networks.Ropsten,
+        4: Networks.Rinkeby,
+        42: Networks.Kovan,
     } as { [symbol: number]: string },
     NETWORK_ID_BY_NAME: {
-        [Networks.mainnet]: 1,
-        [Networks.ropsten]: 3,
-        [Networks.rinkeby]: 4,
-        [Networks.kovan]: 42,
+        [Networks.Mainnet]: 1,
+        [Networks.Ropsten]: 3,
+        [Networks.Rinkeby]: 4,
+        [Networks.Kovan]: 42,
     } as { [networkName: string]: number },
     NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
     PROVIDER_NAME_LEDGER: 'Ledger',
diff --git a/packages/website/ts/utils/mui_theme.ts b/packages/website/ts/utils/mui_theme.ts
index d73e80606..32891baca 100644
--- a/packages/website/ts/utils/mui_theme.ts
+++ b/packages/website/ts/utils/mui_theme.ts
@@ -8,6 +8,7 @@ export const muiTheme = getMuiTheme({
         textColor: colors.black,
     },
     palette: {
+        accent1Color: colors.lightBlueA700,
         pickerHeaderColor: colors.lightBlue,
         primary1Color: colors.lightBlue,
         primary2Color: colors.lightBlue,
diff --git a/packages/website/ts/utils/utils.ts b/packages/website/ts/utils/utils.ts
index 13a6d6ae2..7e69b1c5f 100644
--- a/packages/website/ts/utils/utils.ts
+++ b/packages/website/ts/utils/utils.ts
@@ -151,7 +151,7 @@ export const utils = {
         if (_.isUndefined(networkName)) {
             return undefined;
         }
-        const etherScanPrefix = networkName === Networks.mainnet ? '' : `${networkName.toLowerCase()}.`;
+        const etherScanPrefix = networkName === Networks.Mainnet ? '' : `${networkName.toLowerCase()}.`;
         return `https://${etherScanPrefix}etherscan.io/${suffix}/${addressOrTxHash}`;
     },
     setUrlHash(anchorId: string) {
@@ -183,7 +183,7 @@ export const utils = {
     // after a user was prompted to sign a message or send a transaction and decided to
     // reject the request.
     didUserDenyWeb3Request(errMsg: string) {
-        const metamaskDenialErrMsg = 'User denied message';
+        const metamaskDenialErrMsg = 'User denied';
         const paritySignerDenialErrMsg = 'Request has been rejected';
         const ledgerDenialErrMsg = 'Invalid status 6985';
         const isUserDeniedErrMsg =
@@ -276,4 +276,10 @@ export const utils = {
             exchangeContractErrorToHumanReadableError[error] || ZeroExErrorToHumanReadableError[error];
         return humanReadableErrorMsg;
     },
+    isParityNode(nodeVersion: string): boolean {
+        return _.includes(nodeVersion, 'Parity');
+    },
+    isTestRpc(nodeVersion: string): boolean {
+        return _.includes(nodeVersion, 'TestRPC');
+    },
 };
diff --git a/packages/website/ts/web3_wrapper.ts b/packages/website/ts/web3_wrapper.ts
index 415df6e8b..9d8d771af 100644
--- a/packages/website/ts/web3_wrapper.ts
+++ b/packages/website/ts/web3_wrapper.ts
@@ -24,9 +24,6 @@ export class Web3Wrapper {
 
         this._web3 = new Web3();
         this._web3.setProvider(provider);
-
-        // tslint:disable-next-line:no-floating-promises
-        this._startEmittingNetworkConnectionAndUserBalanceStateAsync();
     }
     public isAddress(address: string) {
         return this._web3.isAddress(address);
@@ -90,11 +87,7 @@ export class Web3Wrapper {
     public updatePrevUserAddress(userAddress: string) {
         this._prevUserAddress = userAddress;
     }
-    private async _getNetworkAsync() {
-        const networkId = await promisify(this._web3.version.getNetwork)();
-        return networkId;
-    }
-    private async _startEmittingNetworkConnectionAndUserBalanceStateAsync() {
+    public startEmittingNetworkConnectionAndUserBalanceState() {
         if (!_.isUndefined(this._watchNetworkAndBalanceIntervalId)) {
             return; // we are already emitting the state
         }
@@ -127,7 +120,7 @@ export class Web3Wrapper {
                     }
 
                     // Check for user ether balance changes
-                    if (userAddressIfExists !== '') {
+                    if (!_.isEmpty(userAddressIfExists)) {
                         await this._updateUserEtherBalanceAsync(userAddressIfExists);
                     }
                 } else {
@@ -140,11 +133,15 @@ export class Web3Wrapper {
             },
             5000,
             (err: Error) => {
-                utils.consoleLog(`Watching network and balances failed: ${err}`);
+                utils.consoleLog(`Watching network and balances failed: ${err.stack}`);
                 this._stopEmittingNetworkConnectionAndUserBalanceStateAsync();
             },
         );
     }
+    private async _getNetworkAsync() {
+        const networkId = await promisify(this._web3.version.getNetwork)();
+        return networkId;
+    }
     private async _updateUserEtherBalanceAsync(userAddress: string) {
         const balance = await this.getBalanceInEthAsync(userAddress);
         if (!balance.eq(this._prevUserEtherBalanceInEth)) {
@@ -153,6 +150,8 @@ export class Web3Wrapper {
         }
     }
     private _stopEmittingNetworkConnectionAndUserBalanceStateAsync() {
-        intervalUtils.clearAsyncExcludingInterval(this._watchNetworkAndBalanceIntervalId);
+        if (!_.isUndefined(this._watchNetworkAndBalanceIntervalId)) {
+            intervalUtils.clearAsyncExcludingInterval(this._watchNetworkAndBalanceIntervalId);
+        }
     }
 }