{"uid":"cap_7YazOUo6HOyEf8kftqheP","slug":"x402-toolbox-nft-owner-lookup-f63ef24e","name":"x402-toolbox NFT Owner Lookup","description":"309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.","url":"https://x402-toolbox.shablony-pro.workers.dev/chain/nft-owner?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"schema":{"type":"string"}}},"responseSchema":{"type":"json","example":{"ok":true,"paid":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_SY2jt4QBokDEOTC637HSW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up the current owner of an NFT on-chain, returning ownership data for a given token.","exampleAgentPrompt":"Who currently owns the NFT with schema 'erc721:0xAbCd1234...tokenId:42' on Base — can you look that up for me?","exampleUseCases":[{"title":"Verify NFT ownership before gating access","prompt":"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."},{"title":"Trace current holder of a high-value NFT","prompt":"I just saw this NFT get sold — can you tell me who owns it right now? The schema is erc721:0xDeadBeef...tokenId:1001."},{"title":"Audit NFT provenance for a marketplace listing","prompt":"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."}],"resultDescription":"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).","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:49:11.229Z","isFirstParty":false,"canonicalSlug":"x402-toolbox-nft-owner-lookup-f63ef24e"}