
Satellite information.
TLE API is a free Science & Math API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.
TLE API provides up to date NORAD two line element sets for number of Earth orbiting satellites
Details from tle.ivanstanojevic.me.

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Yes. The TLE API is listed in the Science & Math 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 TLE API requires no authentication, so you can start making requests without signing up.
Not directly. The TLE API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The TLE API is served over HTTPS, so it's safe to use in production.