# NFT Owner Lookup by Token ID (ERC-721, Multi-Chain)

> 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.

## Facts

- Endpoint: POST https://api.vextorium.com/nft-propietario-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nft-owner-lookup-by-token-id-erc-721-multi-chain-2cc3b31d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y_dmVz2PtRtOeD1xNA_yO

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability nft-owner-lookup-by-token-id-erc-721-multi-chain-2cc3b31d -d '<json body>'
```

Example prompt: Who currently owns Bored Ape #1 on Ethereum? The contract is 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D and the token ID is 1.

## When to prefer this

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.

## Known failure modes

- 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

## 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').

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "red": {
   "enum": [
    "base",
    "ethereum",
    "arbitrum",
    "optimism",
    "polygon",
    "bnb",
    "avalanche",
    "gnosis",
    "linea",
    "scroll",
    "sonic",
    "unichain"
   ],
   "type": "string",
   "description": "Chain (default base)"
  },
  "contrato": {
   "type": "string"
  },
  "token_id": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "red": "ethereum",
  "nombre": "BoredApeYachtClub",
  "token_id": "1",
  "coleccion": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "token_uri": "ipfs://QmeSjSinHpPnmXmspMjwiXyN6zS4E9zccariGR3jxcaWtq/1",
  "propietario": "0x46EFbAedc92067E6d60E84ED6395099723252496"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nft-owner-lookup-by-token-id-erc-721-multi-chain-2cc3b31d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)