feat: have coinbase API return BigNumber for eth-usd price endpoint

packages/instant/src/redux/async_data.ts

@@ -1,5 +1,6 @@
 import { BigNumber } from '@0xproject/utils';
 
+import { BIG_NUMBER_ZERO } from '../constants';
 import { ActionTypes } from '../types';
 import { coinbaseApi } from '../util/coinbase_api';
 
@@ -7,15 +8,15 @@ import { store } from './store';
 
 export const asyncData = {
     fetchAndDispatchToStore: async () => {
-        let ethUsdPriceStr = '0';
+        let ethUsdPrice = BIG_NUMBER_ZERO;
         try {
-            ethUsdPriceStr = await coinbaseApi.getEthUsdPrice();
+            ethUsdPrice = await coinbaseApi.getEthUsdPrice();
         } catch (e) {
             // ignore
         } finally {
             store.dispatch({
                 type: ActionTypes.UPDATE_ETH_USD_PRICE,
-                data: new BigNumber(ethUsdPriceStr),
+                data: ethUsdPrice,
             });
         }
     },

packages/instant/src/util/coinbase_api.ts

@@ -1,8 +1,10 @@
+import { BigNumber } from '@0xproject/utils';
+
 const baseEndpoint = 'https://api.coinbase.com/v2';
 export const coinbaseApi = {
-    getEthUsdPrice: async (): Promise<string> => {
+    getEthUsdPrice: async (): Promise<BigNumber> => {
         const res = await fetch(`${baseEndpoint}/prices/ETH-USD/buy`);
         const resJson = await res.json();
-        return resJson.data.amount;
+        return new BigNumber(resJson.data.amount);
     },
 };