Current crypto market breadth, funding and open-interest research datasets.
CoinNudge API is a free Cryptocurrency API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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