x402-toolbox NFT Owner Lookup

x402

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 2026-09-29).

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

Price / call$0.002

Seller volume →—

Success—

StatusUnknown

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).

Example use cases

Verify NFT ownership before gating access

“Before granting this user access to the exclusive channel, check who owns NFT token ID 7 from contract 0xAbCd1234 — I need to confirm the wallet address is actually theirs.”

Trace current holder of a high-value NFT

“I just saw this NFT get sold — can you tell me who owns it right now? The schema is erc721:0xDeadBeef...tokenId:1001.”

Audit NFT provenance for a marketplace listing

“For this marketplace listing, I need to confirm the current on-chain owner of the NFT described by schema erc721:0x1111aaaa...tokenId:55 before we proceed with the sale.”

Technical details

Endpoint

GEThttps://x402-toolbox.shablony-pro.workers.dev/chain/nft-owner?utm_source=zero.xyz

When to prefer

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.

Side effects

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

Input

Schema · Request body

Field	Type	Description
schema	string

Output

Schema · Response

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

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