CoinLobster
Live executed whale trades across 15 exchanges and on-chain DEX with an unusualness radar
Cryptocurrencies prices, volume and more.
Coinlore API is a free Cryptocurrency API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Free cryptocurrency API with real-time prices, 365-day OHLCV history, market cap, volume, exchange data, and social stats for 14,000+ coins. No API key required.
Details from coinlore.com.

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Live executed whale trades across 15 exchanges and on-chain DEX with an unusualness radar
The Coinlore API is provided by CoinLore (coinlore.com). Free cryptocurrency API with real-time prices, 365-day OHLCV history, market cap, volume, exchange data, and social stats for 14,000+ coins. No API key required.
Yes. The Coinlore 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 Coinlore API requires no authentication, so you can start making requests without signing up.
CORS support for the Coinlore API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Coinlore API is served over HTTPS, so it's safe to use in production.