URL shortener service.
CleanURI API is a free URL Shorteners API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The CleanURI 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 CleanURI API requires no authentication, so you can start making requests without signing up.
Yes. The CleanURI API supports CORS, so front-end JavaScript can call it directly.
Yes. The CleanURI API is served over HTTPS, so it's safe to use in production.