CurrencyFreaks API provides currency conversion, current and historical forex exchange rate, currency fluctuation, and IP to currency data through REST API in json and xml formats.

Get Currency exchange rates JSON API for real-time of 144 Countries with simple REST API.

A simple, reliable and real-time currency exchange API for current and historical forex rates.

Frankfurter is a free and open-source currency data API that tracks reference exchange rates published by the European Central Bank.

ExchangeRate-API is a totally free & unlimited currency conversion API.

Exchange rates and gold prices in the XML and JSON formats.

Free exchange rates and historical rates

Exchange rates API with currency conversion

Realtime Forex and Cryptocurrency Quotes API

JSON API for foreign exchange rates and currency conversion

Exchange Rates & Currency Conversion