{"uid":"cap_l4QO1aGrlk-VMInBqMRhv","slug":"erc721-ownerof-lookup-60d51e50","name":"ERC721 ownerOf Lookup","description":"Returns the owner address of a specific ERC721 token by token ID. Input: contract address (string), tokenId (string). Output: owner address (string). Query: token (ERC-721 contract, 0x + 40 hex), id (token id, decimal).","url":"https://ari001.tailb4ac3a.ts.net/v1/ventures/ethereum_contract_abi_service/erc721_ownerof?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["token","id"],"properties":{"id":{"type":"string","pattern":"^[0-9]{1,78}$","description":"token id, decimal"},"token":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$","description":"ERC-721 contract, 0x + 40 hex"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["ok","service"],"properties":{"ok":{"type":"boolean"},"chain":{"type":"string"},"error":{"type":"string","description":"present when ok is false"},"method":{"type":"string"},"result":{"type":"object","properties":{"id":{"type":"string"},"owner":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"},"token":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"}}},"service":{"type":"string"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KeYu3B4zdZvGD7zw7E3ie","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current owner address of a specific ERC721 NFT token by contract address and token ID on Ethereum","exampleAgentPrompt":"Who currently owns token ID 7804 on the CryptoPunks ERC721 contract at 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB on Ethereum?","exampleUseCases":[{"title":"NFT ownership verification before sale","prompt":"Before I proceed with this NFT trade, can you check who owns token ID 3429 on the contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D? I want to confirm it's still the seller's wallet."},{"title":"Airdrop recipient resolution","prompt":"I need to send an airdrop to the current owner of token 512 on the ERC721 contract at 0x60E4d786628Fea6478F785A6d7e704777c86a7c6 — can you look up their wallet address?"},{"title":"NFT provenance and custody check","prompt":"Can you tell me which wallet holds token ID 1 on the Azuki contract at 0xED5AF388653567Af2F388E6224dC7C4b3241C544 right now?"}],"resultDescription":"Returns a JSON object with ok (boolean), the queried token contract address, token ID, and the owner field containing the Ethereum address (0x-prefixed, 40 hex chars) that currently holds the specified ERC721 token. On failure, returns ok: false with an error message.","failureModes":["Invalid contract address format returns a 400 or error response","Token ID does not exist on the contract causes a revert / error result","Contract address is not an ERC721 contract returns an error","Network or RPC node unavailability causes a timeout or 5xx error","Token ID exceeds 78 decimal digits fails schema validation"],"whenToPreferThis":"Use this endpoint when you need to resolve the current holder of a specific ERC721 NFT on Ethereum mainnet given a contract address and token ID. Prefer this over general blockchain RPC calls when you want a simple, paid, ready-made API without managing your own node. It is specifically scoped to ERC721 ownerOf queries on Ethereum, so avoid it for ERC1155 tokens, Base chain NFTs, or bulk ownership lookups.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T00:44:17.380Z","isFirstParty":false,"canonicalSlug":"erc721-ownerof-lookup-60d51e50"}