Neetix Liveliness
Face liveness, presentation-attack detection and 1:1 face match for identity verification
Open source vulnerability database and distributed triage infrastructure.
OSV API is a free Security API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Information about the OSV database and API.
Details from google.github.io.

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Face liveness, presentation-attack detection and 1:1 face match for identity verification
The OSV API is provided by OSV (google.github.io). Information about the OSV database and API.
Yes. The OSV API is listed in the Security 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 OSV API requires no authentication, so you can start making requests without signing up.
Yes. The OSV API supports CORS, so front-end JavaScript can call it directly.
Yes. The OSV API is served over HTTPS, so it's safe to use in production.