Source-linked historical reference exchange rates with CSV, JSON and an MCP server.
FXpeek API is a free Currency Exchange API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Real-time foreign exchange rates for major currency pairs
Iran free-market USD, EUR, CNY, gold and coin rates in toman, live and daily archive since 2010
Yes. The FXpeek 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.
No. The FXpeek API requires no authentication, so you can start making requests without signing up.
CORS support for the FXpeek API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The FXpeek API is served over HTTPS, so it's safe to use in production.