Resolve a Basename or ENS name to an address, or an address to its primary name. Pass ?name=402utils.base.eth (name→address) or ?address=0x… (address→primary name). Basenames resolve on Base L2, other .eth names on Ethereum mainnet. Reverse results are forward-verified. ASCII names only; offchain (CCIP-read) resolvers like cb.id are not supported.