
Cross-validated gold, silver & copper spot, futures & 30-year history in 13 currencies.
Goldprice.dev API is a free Finance API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Get silver prices per gram in local currencies and dealer sell and buyback quotes by country, with premiums over spot, endpoint examples and plan requirements.
Details from goldprice.dev.

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Yes. The Goldprice.dev API is listed in the Finance 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 Goldprice.dev API requires no authentication, so you can start making requests without signing up.
CORS support for the Goldprice.dev API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Goldprice.dev API is served over HTTPS, so it's safe to use in production.