Query Minecraft, Steam and XBox Accounts.
PlayerDB API is a free Games & Comics API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
PlayerDB is a JSON powered player fetching and caching service. Lookup player names and IDs for Minecraft, Hytale, Steam, and Xbox accounts.
Details from playerdb.co.

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Trivia Questions
Pokémon TCG Information
The PlayerDB API is provided by PlayerDB (playerdb.co). PlayerDB is a JSON powered player fetching and caching service. Lookup player names and IDs for Minecraft, Hytale, Steam, and Xbox accounts.
Yes. The PlayerDB 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 PlayerDB API requires no authentication, so you can start making requests without signing up.
CORS support for the PlayerDB API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The PlayerDB API is served over HTTPS, so it's safe to use in production.