Free and simple counting service. You can use it to track page hits and specific events.
CountAPI is a free Development 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 CountAPI is listed in the Development 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 CountAPI requires no authentication, so you can start making requests without signing up.
Yes. The CountAPI supports CORS, so front-end JavaScript can call it directly.
Yes. The CountAPI is served over HTTPS, so it's safe to use in production.