Torrent URL shorten API.
Mgnet.me API is a free URL Shorteners API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.

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