SpellzCode — Mantle is-contract check (MPP)
https://agent-data-tools.revmesh2074.workers.dev/mantle/is-contract?address=0x09Bc4E0D864854c6aFB6eB9A9cdF58aC190D0dF9Overview
Check whether a 0x address on Mantle is a smart contract or a plain wallet: bytecode size, whether it is an EIP-1167 minimal proxy and which implementation it points to, and whether it is a wallet that delegates to contract code (EIP-7702; delegatedTo names the code, isContract stays false). Use before sending funds or approving a spender; for a fuller risk verdict use check_counterparty. A malformed address is rejected with 400, uncharged.