Comics.
Comic Vine API is a free Games & Comics API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
The largest comic database online, Comic Vine features Comic Reviews, News, Videos, and Forums for the latest in and more!
Details from comicvine.gamespot.com.

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The Comic Vine API is provided by Comic Vine (comicvine.gamespot.com). The largest comic database online, Comic Vine features Comic Reviews, News, Videos, and Forums for the latest in and more!
Yes. The Comic Vine 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 Comic Vine API requires no authentication, so you can start making requests without signing up.
CORS support for the Comic Vine API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Comic Vine API is served over HTTPS, so it's safe to use in production.