Calculate fee

src/utils/convertPrice.ts

@@ -0,0 +1,26 @@
+import { BigNumber } from 'bignumber.js';
+
+export default function convertPrice(
+  amount: BigNumber.Value,
+  assetInAddress: string,
+  assetOutAddress: string,
+  prices: Partial<Record<string, string>> // quoted in quoteAsset. [address]: priceQuotedInQuoteAsset
+) {
+  const assetInPrice = prices[assetInAddress];
+  if (assetInPrice === undefined) throw Error('assetInPrice is undefined');
+
+  const assetOutPrice = prices[assetOutAddress];
+  if (assetOutPrice === undefined) throw Error('assetOutPrice is undefined');
+
+  const assetInPriceBN = new BigNumber(assetInPrice);
+  const assetOutPriceBN = new BigNumber(assetOutPrice);
+
+  const assetInAmountBN = new BigNumber(amount);
+
+  const assetInAmountInQuoteAsset = assetInAmountBN.multipliedBy(assetInPriceBN);
+  const assetInAmountInQuoteAssetBN = new BigNumber(assetInAmountInQuoteAsset);
+
+  const assetOutAmountInQuoteAsset = assetInAmountInQuoteAssetBN.dividedBy(assetOutPriceBN);
+
+  return assetOutAmountInQuoteAsset;
+}