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NFT Owner Lookup by Token ID (ERC721)
x402
NFT Owner Lookup by Token ID (ERC721) is a paid API for AI agents from skills.onesource.io, paid per call via x402, $0.003000/call, status unknown (last checked 2026-09-13).
Returns the current on-chain owner address of a specific ERC721 NFT by querying ownerOf via eth_call
Price / call$0.003000
Success—
StatusUnknown
How this service works
Look up the current owner of an ERC721 NFT by token_id via ownerOf (eth_call)
Output
Returns the wallet address of the current owner of the specified ERC721 token, as returned by the on-chain ownerOf function via eth_call on the requested network.
Example use cases
Verify NFT ownership for marketplace disputes
“Can you check who currently owns token 5847 from the Bored Ape Yacht Club contract on Ethereum to settle this ownership dispute?”
Automated compliance check for token transfers
“I need you to verify the current owner of token ID 234 in the Pudgy Penguins contract on Ethereum mainnet to confirm our transfer records are accurate.”
Real-time holder lookup across NFT collections
“Which wallet address owns token 1099 from the Doodles NFT contract on Base network right now?”
Technical details
Endpoint
GEThttps://skills.onesource.io/api/chain/nft-ownerWhen to prefer
Use this endpoint when you need the current on-chain owner of a specific ERC721 token and need a simple, low-latency lookup without indexing overhead. Prefer this over NFT marketplace APIs when you need authoritative on-chain data rather than cached or indexed data. Good for verification, compliance, or automation workflows that need real-time ownership state across Ethereum, Base, Avalanche, or Sepolia.
Side effects
- Token ID does not exist (reverted or not minted) — contract call reverts
- Invalid contract address format — 400 validation error
- Network not supported or unavailable — 400 or 503 error
- Contract is not ERC721 or does not implement ownerOf — call reverts or returns unexpected data
- Token has been burned — may revert or return zero address
Input
{
"network": "ethereum",
"contract": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
"token_id": "1"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| network | string | |
| contract | string | |
| token_id | string |
Output
{
"data": {
"owner": "0x46efbaedc92067e6d60e84ed6395099723252496",
"token_id": "1",
"contract_address": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"
},
"meta": {
"endpoint": "/api/chain/nft-owner",
"request_id": "8f50191273f5084d"
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| datarequired | object | |
| metarequired | object |
Tags
x402
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