TV Show Data.
TVMaze API is a free Video API that requires no API key, is only available over HTTP and has unconfirmed CORS support.
Add television information to your own website or app with a fast and clean TV API. Add schedules, show, episode, cast information, ...
Details from tvmaze.com.

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The TVMaze API is provided by TVmaze (tvmaze.com). Add television information to your own website or app with a fast and clean TV API. Add schedules, show, episode, cast information, ...
Yes. The TVMaze API is listed in the Video 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 TVMaze API requires no authentication, so you can start making requests without signing up.
CORS support for the TVMaze API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The TVMaze API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.