
Anime discovery & tracking.
AniList API is a free Anime API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
AniList API documentation.
Details from github.com.

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Anime discovery, streaming & syncing with trackers
The AniList API is provided by AniList (github.com). AniList API documentation.
Yes. The AniList 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 AniList API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the AniList API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The AniList API is served over HTTPS, so it's safe to use in production.