@swapper-finance/sdk/src/utils/fees.ts

JavaScript SDK form Swapper

import { weiToHumanReadable } from "./numbers";

export const calculateFees = ({ route, cashToken, shift4Fees }) => {
  const platformFee = Number(
    weiToHumanReadable({
      amount: route?.platformFeeInUSDC || "0",
      decimals: cashToken?.decimals || 6,
      precisionFractionalPlaces: 2,
    }),
  );

  const networkFee =
    Number(
      weiToHumanReadable({
        amount: route?.gasCostInUSDC || "0",
        decimals: cashToken?.decimals || 6,
        precisionFractionalPlaces: 2,
      }),
    ) + Number(shift4Fees?.networkFeeFiatAmount || "0");

  const onrampFee = Number(shift4Fees?.processingFeeFiatAmount || "0");

  const totalFees = platformFee + networkFee + onrampFee;

  return {
    totalFees,
    platformFee: platformFee.toFixed(2),
    networkFee: networkFee.toFixed(2),
    onrampFee: onrampFee.toFixed(2),
  };
};