
Includes all monsters and spells from the SRD (System Reference Document) as well as a search API.
Dungeons and Dragons (Alternate) API is a free Games & Comics API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Free and open-source library of 5e rules, monsters, spells, etc. Powered by the Open5e API
Details from open5e.com.

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The Dungeons and Dragons (Alternate) API is provided by Open5e (open5e.com). Free and open-source library of 5e rules, monsters, spells, etc. Powered by the Open5e API
Yes. The Dungeons and Dragons (Alternate) API is listed in the Games & Comics 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 Dungeons and Dragons (Alternate) API requires no authentication, so you can start making requests without signing up.
Yes. The Dungeons and Dragons (Alternate) API supports CORS, so front-end JavaScript can call it directly.
Yes. The Dungeons and Dragons (Alternate) API is served over HTTPS, so it's safe to use in production.