Exchange rates between 162 currency & 300 crypto currency update each 5 min, accurate, no limits.
Hirak Exchange Rates API is a free Cryptocurrency API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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