AniAPI
Anime discovery, streaming & syncing with trackers
Anime Database.
AniDB API is a free Anime API that requires apiKey authentication, is only available over HTTP and has unconfirmed CORS support.

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Anime discovery, streaming & syncing with trackers
Yes. The AniDB API is listed in the Anime 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 AniDB API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the AniDB API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The AniDB API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.