Degenscan Intel
Hyperliquid funding on every dex (HIP-3 incl.), cross-dex spreads, event feed; free trial key

Productive crypto indices, daily benchmarks, sector indices and market-stress data.
Dudelytics API is a free Cryptocurrency API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.
Public JSON data for the DPMI family: main index, Holder Quality, benchmark, sectors, Fear & Greed and DVIX, with timestamps and methodology.
Details from dudelytics.com.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Hyperliquid funding on every dex (HIP-3 incl.), cross-dex spreads, event feed; free trial key
Ethereum tokens, balances, addresses, history of transactions, contracts, and custom structures
Real-time Ethereum whale wallet tracking, DEX trades, net flow, and conviction scoring
The Dudelytics API is provided by Dudelytics (dudelytics.com). Public JSON data for the DPMI family: main index, Holder Quality, benchmark, sectors, Fear & Greed and DVIX, with timestamps and methodology.
Yes. The Dudelytics 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 Dudelytics API requires no authentication, so you can start making requests without signing up.
Not directly. The Dudelytics API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Dudelytics API is served over HTTPS, so it's safe to use in production.