Free Currency Exchange APIs

Exchangerate.host provides free foreign exchange and cryptocurrency rates via a simple REST API, covering 170+ currencies and major crypto assets.

The Bank of Russia XML API provides official daily exchange rates for foreign currencies against the Russian Ruble, published by the Central Bank of the Russian Federation.

Currency-api is a free, open-source currency exchange rates API hosted on GitHub with no rate limits, no authentication, and support for 150+ currencies.

The Czech National Bank (CNB) publishes official daily exchange rates for 30+ currencies against the Czech Koruna (CZK) as a plain XML file.

Economia.Awesome is a free Brazilian API that provides real-time and historical currency exchange rates for dozens of currency pairs, including BRL (Brazilian Real) against USD, EUR, BTC, and more.

Frankfurter is an open-source currency data API backed by the European Central Bank (ECB) exchange rate dataset, providing rates for 33 major currencies updated every weekday.

The National Bank of Poland (NBP) API is an official government data source providing daily exchange rates for 35+ currencies relative to the Polish Zloty (PLN), published on each banking day.