Exchange rates and currency conversion.
Fixer API is a free Currency Exchange API that requires apiKey authentication, is only available over HTTP and has unconfirmed CORS support.
Access current and historical foreign exchange rates with Fixer API. Get free, lightweight currency conversion for your applications. Click now.
Details from fixer.io.

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The Fixer API is provided by Fixer API (fixer.io). Access current and historical foreign exchange rates with Fixer API. Get free, lightweight currency conversion for your applications. Click now.
Yes. The Fixer 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 Fixer API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Fixer API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The Fixer API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.