
Game Streaming API.
Twitch API is a free Social API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Twitch Developer Documentation
Details from dev.twitch.tv.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Public Twitter/X data: profiles, tweets, replies, search, followers, lists, communities, trends
The Twitch API is provided by Twitch Developers (dev.twitch.tv). Twitch Developer Documentation
Yes. The Twitch API is listed in the Social 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 Twitch API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Twitch API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Twitch API is served over HTTPS, so it's safe to use in production.