# x402-toolbox NFT Owner Lookup

> x402-toolbox NFT Owner Lookup is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Looks up the current owner of an NFT on-chain, returning ownership data for a given token.

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/chain/nft-owner?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-nft-owner-lookup-f63ef24e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7YazOUo6HOyEf8kftqheP

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 x402-toolbox-nft-owner-lookup-f63ef24e
```

Example prompt: Who currently owns the NFT with schema 'erc721:0xAbCd1234...tokenId:42' on Base — can you look that up for me?

## When to prefer this

Choose this endpoint when you need a no-signup, no-API-key way to resolve on-chain NFT ownership on Base, paying per call in USDC via x402. Ideal for agents that need one-off or low-volume NFT ownership lookups without managing credentials.

## Known failure modes

- Invalid or malformed schema string returns an error or empty result
- NFT contract not deployed on Base returns not-found
- Payment failure via x402 results in 402 response and no data returned
- Token ID does not exist in the specified contract returns null owner

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON object with an 'ok' flag confirming the call succeeded, a 'paid' flag confirming x402 micropayment was accepted, and ownership data for the queried NFT (wallet address of the current holder).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "schema": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-nft-owner-lookup-f63ef24e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)