Fixer.io - Fixer provides a free, simple, and lightweight API for current and historical foreign exchange rates and currency conversion. The API tracks rates published daily by the European Central Bank.
FXRatesAPI - Your Gateway to Real-Time Exchange Rates
Freecurrencyapi.com - Freecurrencyapi.com is a free, reliable & feature-complete currency exchange rates API. 32 world currencies & daily update rates.
Open Exchange Rates - Free, hourly-updated exchange rates - a simple, accurate, open-source JSON API. Free for personal use, a bargain for everybody else.
fxAPI - fxapi.com is the premier forex API for developers and traders. With our easy-to-use platform, you can access real-time market data, analyze trends, and build custom indicators to make informed trading decisions.
Currencylayer - Free and startup-friendly currency converter JSON API for real-time and historical exchange rates - reliable and accurate, supporting 168 world currencies.