0.0.0.0:4021

Full Ethereum transaction details by hash via eth_getTransactionByHash - from, to, value, calldata, block

ENS resolve - turn a .eth name into an address, or an address into its primary .eth name, via eth_call on OneSource live

Latest Ethereum block height - current chain tip via eth_blockNumber

Transaction receipt via eth_getTransactionReceipt - status, gas, and event logs for a mined Ethereum transaction

Check if an Ethereum address is a contract via eth_getCode - returns deployed bytecode