
Sakura CardCaptor Cards Information.
Sakura CardCaptor API is a free Games & Comics API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Details from github.com.

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The Sakura CardCaptor API is provided by JessVel (github.com).
Yes. The Sakura CardCaptor 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 Sakura CardCaptor API requires no authentication, so you can start making requests without signing up.
CORS support for the Sakura CardCaptor API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Sakura CardCaptor API is served over HTTPS, so it's safe to use in production.