Exchange rates with currency conversion.
Exchangeratesapi.io API is a free Currency Exchange API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Power your product with accurate FX rates. Free REST API, JSON output, 60 second updates and historical data back to 1999. Trusted by 100,000+ developers.
Details from exchangeratesapi.io.

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The Exchangeratesapi.io API is provided by Exchange Rates API (exchangeratesapi.io). Power your product with accurate FX rates. Free REST API, JSON output, 60 second updates and historical data back to 1999. Trusted by 100,000+ developers.
Yes. The Exchangeratesapi.io API is listed in the Currency Exchange category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Exchangeratesapi.io API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Exchangeratesapi.io API supports CORS, so front-end JavaScript can call it directly.
Yes. The Exchangeratesapi.io API is served over HTTPS, so it's safe to use in production.