How can I get foreign exchange rates thru an API?

I need an API that provides latest currency exchange rates for my money transfer website

Solution

Try by using CurrencyFreaks API. Its key features are:

Reliable data as they source their data from various trusted Forex exchanges and
Banks.
You can get updates every 60 sec.
You can change the ‘Base’ currency.
It provides currency exchange rates for 179 currencies worldwide including currencies, metals, and cryptocurrencies.
Supported codes for the endpoints are Shell, Node.js, Java, Python,
PHP, Ruby, JS, C#, Go, C, Swift.

Here is the latest exchange rates endpoint:

$ curl 'https://api.currencyfreaks.com/latest?apikey=YOUR_APIKEY'

The JSON response will be as follows:

{
    "date": "2020-07-02 10:39:00+00",
    "base": "USD",
    "rates": {
        "FJD": 2.1692,
        "MXN": 22.602,
        "STD": 22000.6197,
        "SCR": 17.6,
        "LVL": 0.6563,
        "CDF": 1907.87,
        "BBD": 2.0,
        "GTQ": 7.7,
        "CLP": 808.6,
        "UGX": 3721.0,
        "HNL": 24.7553,
        "ZAR": 16.9326,
        "TND": 2.8445,
        "CUC": 1.0,
        "SLL": 9778.35,
        "BSD": 1.0,
      [...]
    } }

You can also get live currency exchange rates from here: https://currencyfreaks.com/exchange-rates

Hope it will help you.