Image manipulation and processing.
Dagpi API is a free Photography API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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