3 files changed, 36 insertions, 6 deletions

diff --git a/packages/instant/src/util/analytics.ts b/packages/instant/src/util/analytics.ts
index e6128f857..6c63907dc 100644
--- a/packages/instant/src/util/analytics.ts
+++ b/packages/instant/src/util/analytics.ts
@@ -6,6 +6,7 @@ import { GIT_SHA, HEAP_ENABLED, INSTANT_DISCHARGE_TARGET, NODE_ENV, NPM_PACKAGE_
 import {
     AffiliateInfo,
     Asset,
+    BaseCurrency,
     Network,
     OrderProcessState,
     OrderSource,
@@ -37,6 +38,7 @@ enum EventNames {
     ACCOUNT_UNLOCK_REQUESTED = 'Account - Unlock Requested',
     ACCOUNT_UNLOCK_DENIED = 'Account - Unlock Denied',
     ACCOUNT_ADDRESS_CHANGED = 'Account - Address Changed',
+    BASE_CURRENCY_CHANGED = 'Base Currency - Changed',
     PAYMENT_METHOD_DROPDOWN_OPENED = 'Payment Method - Dropdown Opened',
     PAYMENT_METHOD_OPENED_ETHERSCAN = 'Payment Method - Opened Etherscan',
     PAYMENT_METHOD_COPIED_ADDRESS = 'Payment Method - Copied Address',
@@ -47,6 +49,7 @@ enum EventNames {
     BUY_TX_SUBMITTED = 'Buy - Tx Submitted',
     BUY_TX_SUCCEEDED = 'Buy - Tx Succeeded',
     BUY_TX_FAILED = 'Buy - Tx Failed',
+    USD_PRICE_FETCH_FAILED = 'USD Price - Fetch Failed',
     INSTALL_WALLET_CLICKED = 'Install Wallet - Clicked',
     INSTALL_WALLET_MODAL_OPENED = 'Install Wallet - Modal - Opened',
     INSTALL_WALLET_MODAL_CLICKED_EXPLANATION = 'Install Wallet - Modal - Clicked Explanation',
@@ -118,6 +121,7 @@ export interface AnalyticsEventOptions {
     selectedAssetSymbol?: string;
     selectedAssetData?: string;
     selectedAssetDecimals?: number;
+    baseCurrency?: string;
 }
 export enum TokenSelectorClosedVia {
     ClickedX = 'Clicked X',
@@ -141,6 +145,7 @@ export const analytics = {
         window: Window,
         selectedAsset?: Asset,
         affiliateInfo?: AffiliateInfo,
+        baseCurrency?: BaseCurrency,
     ): AnalyticsEventOptions => {
         const affiliateAddress = affiliateInfo ? affiliateInfo.feeRecipient : 'none';
         const affiliateFeePercent = affiliateInfo ? parseFloat(affiliateInfo.feePercentage.toFixed(4)) : 0;
@@ -159,6 +164,7 @@ export const analytics = {
             selectedAssetName: selectedAsset ? selectedAsset.metaData.name : 'none',
             selectedAssetData: selectedAsset ? selectedAsset.assetData : 'none',
             instantEnvironment: INSTANT_DISCHARGE_TARGET || `Local ${NODE_ENV}`,
+            baseCurrency,
         };
         return eventOptions;
     },
@@ -170,6 +176,8 @@ export const analytics = {
     trackAccountUnlockDenied: trackingEventFnWithoutPayload(EventNames.ACCOUNT_UNLOCK_DENIED),
     trackAccountAddressChanged: (address: string) =>
         trackingEventFnWithPayload(EventNames.ACCOUNT_ADDRESS_CHANGED)({ address }),
+    trackBaseCurrencyChanged: (currencyChangedTo: BaseCurrency) =>
+        trackingEventFnWithPayload(EventNames.BASE_CURRENCY_CHANGED)({ currencyChangedTo }),
     trackPaymentMethodDropdownOpened: trackingEventFnWithoutPayload(EventNames.PAYMENT_METHOD_DROPDOWN_OPENED),
     trackPaymentMethodOpenedEtherscan: trackingEventFnWithoutPayload(EventNames.PAYMENT_METHOD_OPENED_ETHERSCAN),
     trackPaymentMethodCopiedAddress: trackingEventFnWithoutPayload(EventNames.PAYMENT_METHOD_COPIED_ADDRESS),
@@ -230,4 +238,5 @@ export const analytics = {
             fetchOrigin,
         });
     },
+    trackUsdPriceFailed: trackingEventFnWithoutPayload(EventNames.USD_PRICE_FETCH_FAILED),
 };
diff --git a/packages/instant/src/util/asset.ts b/packages/instant/src/util/asset.ts
index 13f84ef74..faaeb7c22 100644
--- a/packages/instant/src/util/asset.ts
+++ b/packages/instant/src/util/asset.ts
@@ -2,6 +2,7 @@ import { AssetBuyerError } from '@0x/asset-buyer';
 import { AssetProxyId, ObjectMap } from '@0x/types';
 import * as _ from 'lodash';
 
+import { DEFAULT_UNKOWN_ASSET_NAME } from '../constants';
 import { assetDataNetworkMapping } from '../data/asset_data_network_mapping';
 import { Asset, AssetMetaData, ERC20Asset, Network, ZeroExInstantError } from '../types';
 
@@ -71,7 +72,7 @@ export const assetUtils = {
         }
         return metaData;
     },
-    bestNameForAsset: (asset?: Asset, defaultName: string = '???'): string => {
+    bestNameForAsset: (asset?: Asset, defaultName: string = DEFAULT_UNKOWN_ASSET_NAME): string => {
         if (_.isUndefined(asset)) {
             return defaultName;
         }
diff --git a/packages/instant/src/util/format.ts b/packages/instant/src/util/format.ts
index e9c432b2f..4adb63e21 100644
--- a/packages/instant/src/util/format.ts
+++ b/packages/instant/src/util/format.ts
@@ -2,7 +2,7 @@ import { BigNumber } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
 import * as _ from 'lodash';
 
-import { ETH_DECIMALS } from '../constants';
+import { BIG_NUMBER_ZERO, ETH_DECIMALS } from '../constants';
 
 export const format = {
     ethBaseUnitAmount: (
@@ -20,24 +20,38 @@ export const format = {
         ethUnitAmount?: BigNumber,
         decimalPlaces: number = 4,
         defaultText: React.ReactNode = '0 ETH',
+        minUnitAmountToDisplay: BigNumber = new BigNumber('0.00001'),
     ): React.ReactNode => {
         if (_.isUndefined(ethUnitAmount)) {
             return defaultText;
         }
-        const roundedAmount = ethUnitAmount.round(decimalPlaces).toDigits(decimalPlaces);
-        return `${roundedAmount} ETH`;
+        let roundedAmount = ethUnitAmount.round(decimalPlaces).toDigits(decimalPlaces);
+
+        if (roundedAmount.eq(BIG_NUMBER_ZERO) && ethUnitAmount.greaterThan(BIG_NUMBER_ZERO)) {
+            // Sometimes for small ETH amounts (i.e. 0.000045) the amount rounded to 4 decimalPlaces is 0
+            // If that is the case, show to 1 significant digit
+            roundedAmount = new BigNumber(ethUnitAmount.toPrecision(1));
+        }
+
+        const displayAmount =
+            roundedAmount.greaterThan(BIG_NUMBER_ZERO) && roundedAmount.lessThan(minUnitAmountToDisplay)
+                ? `< ${minUnitAmountToDisplay.toString()}`
+                : roundedAmount.toString();
+
+        return `${displayAmount} ETH`;
     },
     ethBaseUnitAmountInUsd: (
         ethBaseUnitAmount?: BigNumber,
         ethUsdPrice?: BigNumber,
         decimalPlaces: number = 2,
         defaultText: React.ReactNode = '$0.00',
+        minUnitAmountToDisplay: BigNumber = new BigNumber('0.00001'),
     ): React.ReactNode => {
         if (_.isUndefined(ethBaseUnitAmount) || _.isUndefined(ethUsdPrice)) {
             return defaultText;
         }
         const ethUnitAmount = Web3Wrapper.toUnitAmount(ethBaseUnitAmount, ETH_DECIMALS);
-        return format.ethUnitAmountInUsd(ethUnitAmount, ethUsdPrice, decimalPlaces);
+        return format.ethUnitAmountInUsd(ethUnitAmount, ethUsdPrice, decimalPlaces, minUnitAmountToDisplay);
     },
     ethUnitAmountInUsd: (
         ethUnitAmount?: BigNumber,
@@ -48,7 +62,13 @@ export const format = {
         if (_.isUndefined(ethUnitAmount) || _.isUndefined(ethUsdPrice)) {
             return defaultText;
         }
-        return `$${ethUnitAmount.mul(ethUsdPrice).toFixed(decimalPlaces)}`;
+        const rawUsdPrice = ethUnitAmount.mul(ethUsdPrice);
+        const roundedUsdPrice = rawUsdPrice.toFixed(decimalPlaces);
+        if (roundedUsdPrice === '0.00' && rawUsdPrice.gt(BIG_NUMBER_ZERO)) {
+            return '<$0.01';
+        } else {
+            return `$${roundedUsdPrice}`;
+        }
     },
     ethAddress: (address: string): string => {
         return `0x${address.slice(2, 7)}…${address.slice(-5)}`;