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ERC721 ownerOf Lookup
x402
ERC721 ownerOf Lookup is a paid API for AI agents from ari001.tailb4ac3a.ts.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).
Returns the current owner address of a specific ERC721 NFT token by contract address and token ID on Ethereum
Price / call$0.003
Success—
StatusUnknown
How this service works
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).
Output
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.
Example use cases
NFT ownership verification before sale
“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.”
Airdrop recipient resolution
“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?”
NFT provenance and custody check
“Can you tell me which wallet holds token ID 1 on the Azuki contract at 0xED5AF388653567Af2F388E6224dC7C4b3241C544 right now?”
Technical details
Endpoint
GEThttps://ari001.tailb4ac3a.ts.net/v1/ventures/ethereum_contract_abi_service/erc721_ownerof?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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