Hundreds of balances, one RPC round-trip
Checking a list of addresses one at a time means one network round-trip per address — slow, and easy to rate-limit against a free RPC endpoint. Multicall3 (deployed at the same address on nearly every EVM chain) bundles arbitrary read calls into a single transaction-shaped request, so this tool can check hundreds of balances about as fast as it checks one.
How it works
Native mode calls Multicall3’s own getEthBalance for each address; token mode calls the token’s balanceOf (and allowance, if you give a spender) for each address — all batched into one eth_call against Multicall3, read directly from the chain’s public RPC.