

Yu-Gi-Oh! TCG Information.
Yu-Gi-Oh! API is a free Games & Comics API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
YGOPRODeck provides an API for pulling our Yu-Gi-Oh! card data programatically. Use this guide to find out how to use it.
Details from db.ygoprodeck.com.

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The Yu-Gi-Oh! API is provided by YGOPRODeck (db.ygoprodeck.com). YGOPRODeck provides an API for pulling our Yu-Gi-Oh! card data programatically. Use this guide to find out how to use it.
Yes. The Yu-Gi-Oh! 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 Yu-Gi-Oh! API requires no authentication, so you can start making requests without signing up.
CORS support for the Yu-Gi-Oh! API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Yu-Gi-Oh! API is served over HTTPS, so it's safe to use in production.