Path of Exile Game Information.
Path of Exile API is a free Games & Comics API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from pathofexile.com.

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Trivia Questions
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The Path of Exile API is provided by Path of Exile (pathofexile.com).
Yes. The Path of Exile 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.
Yes. The Path of Exile API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Path of Exile API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Path of Exile API is served over HTTPS, so it's safe to use in production.