Fixer

Fixer API is capable of delivering real-time exchange rate data for 170 world currencies. The API comes with multiple endpoints, each serving a different use case. Endpoint functionalities include getting the latest exchange rate data for all or a specific set of currencies, converting amounts from one currency to another, retrieving Time-Series data for one or multiple currencies and querying the API for daily fluctuation data. The Fixer API is the best free currency converter API option. With real-time exchange rates, it's easy and accurate to find out how much money you should be getting paid in another currency.