Real-time foreign exchange rates for major currency pairs.
FreeForexAPI is a free Currency Exchange API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.

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Yes. The FreeForexAPI 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.
No. The FreeForexAPI requires no authentication, so you can start making requests without signing up.
Not directly. The FreeForexAPI does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The FreeForexAPI is served over HTTPS, so it's safe to use in production.