
Ethereum tokens, balances, addresses, history of transactions, contracts, and custom structures.
Ethplorer API is a free Cryptocurrency API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Viewer of Ethereum tokens and transactions based on ERC20 standard.
Details from github.com.

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.
Hyperliquid funding on every dex (HIP-3 incl.), cross-dex spreads, event feed; free trial key
The Ethplorer API is provided by EverexIO (github.com). Viewer of Ethereum tokens and transactions based on ERC20 standard.
Yes. The Ethplorer 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 Ethplorer API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Ethplorer API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Ethplorer API is served over HTTPS, so it's safe to use in production.