Compress GIF files or HTTPS URLs with asynchronous jobs and target-size controls.
CompressGIF API is a free Photography API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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Image manipulation and processing
Yes. The CompressGIF API is listed in the Photography 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.
Yes. The CompressGIF API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the CompressGIF API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The CompressGIF API is served over HTTPS, so it's safe to use in production.