ERCs

ERC-165 — Standard Interface Detection

eips.ethereum.org/EIPS/eip-165

A contract declares which interfaces it supports via supportsInterface(bytes4) — returning true for interface IDs it implements. The interface ID is the XOR of the function selectors.

import { supports_interface } from "@ethernauta/erc/165";

const ok = await supports_interface({ interface_id: "0x80ac58cd" })(
  contract({ chain_id: eip155_1.chain_id, contract: nft_address }),
);
// true → contract implements ERC-721

Surface

Common interface IDs

See also

• ERC-721, ERC-1155 — typical 165-aware contracts.
• @ethernauta/erc/registry — selector → method lookup.