CoinDCX
Cryptocurrency Trading Platform
Cryptocurrency Price, Market, and Developer/Social Data.
CoinGecko API is a free Cryptocurrency API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Cryptocurrency Trading Platform
Live executed whale trades across 15 exchanges and on-chain DEX with an unusualness radar
Yes. The CoinGecko 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.
No. The CoinGecko API requires no authentication, so you can start making requests without signing up.
Yes. The CoinGecko API supports CORS, so front-end JavaScript can call it directly.
Yes. The CoinGecko API is served over HTTPS, so it's safe to use in production.