
USA patent api services.
USPTO API is a free Patent API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Explore data and statistics on patents and trademarks.
Details from uspto.gov.

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API is intended to explore and visualize trends/patterns across the US innovation landscape
The USPTO API is provided by USPTO (uspto.gov). Explore data and statistics on patents and trademarks.
Yes. The USPTO API is listed in the Patent 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 USPTO API requires no authentication, so you can start making requests without signing up.
CORS support for the USPTO API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The USPTO API is served over HTTPS, so it's safe to use in production.