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Shields API is a free Open Source Projects API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
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Details from shields.io.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Search index of MCP servers, agents and APIs, with the tools each server actually exposes
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The Shields API is provided by Shields.io (shields.io). Concise, consistent, and legible badges
Yes. The Shields API is listed in the Open Source Projects 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 Shields API requires no authentication, so you can start making requests without signing up.
CORS support for the Shields API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Shields API is served over HTTPS, so it's safe to use in production.