
Mozilla observatory tls scanner.
Mozilla tls scanner API is a free Security API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
An observatory for TLS configurations, X509 certificates, and more.
Details from github.com.

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The Mozilla tls scanner API is provided by mozilla (github.com). An observatory for TLS configurations, X509 certificates, and more.
Yes. The Mozilla tls scanner 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 Mozilla tls scanner API requires no authentication, so you can start making requests without signing up.
CORS support for the Mozilla tls scanner API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Mozilla tls scanner API is served over HTTPS, so it's safe to use in production.