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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.
Open Exchange Rates - Free, hourly-updated exchange rates - a simple, accurate, open-source JSON API. Free for personal use, a bargain for everybody else.
exchangeratesapi.io - Foreign exchange rates API with currency conversion.
FXRatesAPI - Your Gateway to Real-Time Exchange Rates
ExchangeRate-API - An easy to use, free & reliable Exchange Rate API trusted by tens of thousands of developers since 2010!
Currencyapi.com - Currencyapi.com is a free, reliable & feature complete currency exchange rates API. 170+ world currencies & 60 second update rate.