Historical and realtime cryptocurrency prices and market data.
Nomics API is a free Cryptocurrency API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The Nomics 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 Nomics API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Nomics API supports CORS, so front-end JavaScript can call it directly.
Yes. The Nomics API is served over HTTPS, so it's safe to use in production.