Pokémon TCG Information.
Pokémon TCG API is a free Games & Comics API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
The ultimate Pokémon Trading Card Game developer resource. The Pokémon TCG API allows developers to easily consume Pokémon card and set data in JSON format.
Details from pokemontcg.io.

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The Pokémon TCG API is provided by Pokémon TCG API (pokemontcg.io). The ultimate Pokémon Trading Card Game developer resource. The Pokémon TCG API allows developers to easily consume Pokémon card and set data in JSON format.
Yes. The Pokémon TCG 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 Pokémon TCG API requires no authentication, so you can start making requests without signing up.
CORS support for the Pokémon TCG API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Pokémon TCG API is served over HTTPS, so it's safe to use in production.