Face detection, face recognition with age estimation/gender estimation, accurate, no quota limits.
Hirak FaceAPI is a free Machine Learning API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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Yes. The Hirak FaceAPI is listed in the Machine Learning 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.
Yes. The Hirak FaceAPI uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Hirak FaceAPI is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Hirak FaceAPI is served over HTTPS, so it's safe to use in production.