Get access to Codeforces data.
Codeforces API is a free Programming API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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Yes. The Codeforces API is listed in the Programming 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 Codeforces API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Codeforces API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Codeforces API is served over HTTPS, so it's safe to use in production.