
Final Fantasy XIV market board data.
Universalis API is a free Games & Comics API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Details from universalis.app.

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An extensive API containing data of most Valorant in-game items, assets and more
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The Universalis API is provided by Universalis Documentation (universalis.app).
Yes. The Universalis 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 Universalis API requires no authentication, so you can start making requests without signing up.
Yes. The Universalis API supports CORS, so front-end JavaScript can call it directly.
Yes. The Universalis API is served over HTTPS, so it's safe to use in production.