Random commit message generator.
What The Commit API is a free Test Data API that requires no API key, is only available over HTTP and supports CORS, so it can be called from the browser.

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Yes. The What The Commit API is listed in the Test Data 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 What The Commit API requires no authentication, so you can start making requests without signing up.
Yes. The What The Commit API supports CORS, so front-end JavaScript can call it directly.
No. The What The Commit API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.