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NFT Owner Lookup by Token ID (ERC-721, Multi-Chain)
x402
NFT Owner Lookup by Token ID (ERC-721, Multi-Chain) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).
Returns the current owner address, collection name, and tokenURI of an ERC-721 NFT given its contract address and token ID, across 12 supported EVM chains.
Price / call$0.003
Success—
StatusUnknown
How this service works
Current owner of an ERC-721 NFT by token_id (ownerOf), with collection name and tokenURI. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.
Output
A JSON object containing the blockchain name ('red'), collection name ('nombre'), token ID, contract address ('coleccion'), tokenURI ('token_uri'), and the current owner's wallet address ('propietario').
Example use cases
NFT provenance check for marketplace
“Can you tell me who currently owns token ID 5678 of the CryptoPunks contract 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB on Ethereum, and what the tokenURI points to?”
Verify NFT ownership before airdrop
“I need to confirm the owner of token ID 42 from the NFT collection at contract 0x23581767a106ae21c074b2276D25e5C3e136a68b on Base before I send the airdrop.”
Cross-chain NFT wallet attribution
“Look up who owns token ID 100 from contract 0x...abc on Polygon — I need the owner's wallet address and the collection name.”
Technical details
Endpoint
POSThttps://api.vextorium.com/nft-propietario-pago?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to resolve the current owner of a specific ERC-721 NFT token and retrieve its metadata URI and collection name in a single call, across any of 12 supported EVM chains. Prefer it over generic blockchain RPCs when you want structured, normalized output without handling raw ABI calls yourself.
Side effects
- Contract address is not a valid ERC-721 contract — returns null fields
- Token ID does not exist in the collection — may return null or revert
- Unsupported chain specified — schema validation error
- Non-enumerable or burned token may return zero address as owner
- Network RPC timeout causing delayed or failed response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| red | string | Chain (default base) |
| contrato | string | |
| token_id | string |
Output
Schema · Response
{
"type": "json",
"example": {
"red": "ethereum",
"nombre": "BoredApeYachtClub",
"token_id": "1",
"coleccion": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
"token_uri": "ipfs://QmeSjSinHpPnmXmspMjwiXyN6zS4E9zccariGR3jxcaWtq/1",
"propietario": "0x46EFbAedc92067E6d60E84ED6395099723252496"
}
}Tags
x402
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