add prices utils functions

src/utils/prices.js

@@ -0,0 +1,27 @@
+import cc from 'cryptocompare'
+import { getTokenLabel } from './currencies'
+
+export const generatePairKey = (from, to) => `${from}_${to}`
+export const getUsdPrice = async ticker => {
+  const price = await cc.price(ticker, 'USD')
+  return price
+}
+
+export const getPrices = async () => {
+  const prices = await cc.priceMulti(['ETH', 'SNT'], ['USD'])
+  return prices
+}
+
+const formatter = new Intl.NumberFormat('en-US', {
+  style: 'currency',
+  currency: 'USD',
+  minimumFractionDigits: 2
+})
+
+export const convertTokenAmountUsd = (token, amount, prices) => {
+  const tokenLabel = getTokenLabel(token)
+  if (!amount || !token || !prices[tokenLabel]) return null
+  const rate = prices[tokenLabel]['USD']
+  const formatted = formatter.format(rate * amount)
+  return formatted
+}