{"uid":"cap_dikLh2-sYrNxG6k61RQ4B","slug":"nft-owner-lookup-335a7b63","name":"NFT Owner Lookup","description":"Current owner of an ERC-721 NFT by contract and token ID. Use to verify ownership for token gating, sales or airdrops.","url":"https://bess-x402.onrender.com/v1/evm/nft-owner?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["contract","token_id"],"properties":{"chain":{"type":"string","description":"ethereum, base, arbitrum, optimism or polygon"},"contract":{"type":"string","description":"NFT contract"},"token_id":{"type":"string","description":"Token ID"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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_IrDPyMTdt1UGch1M5M3li","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":"Returns the current owner address of an ERC-721 NFT given its contract address and token ID, on EVM-compatible chains.","exampleAgentPrompt":"Who currently owns token ID 4821 on the Bored Ape Yacht Club contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13d on Ethereum?","exampleUseCases":[{"title":"Token gating NFT access","prompt":"Before letting this user into our exclusive Discord server, check if they own token ID 77 on our NFT contract 0xAbC123...def456 on Ethereum — tell me the current owner address."},{"title":"Airdrop eligibility check","prompt":"I need to verify that wallet 0x742d35Cc...abc123 is the current owner of token ID 500 on contract 0xDEAD...BEEF on Polygon before sending them the airdrop."},{"title":"Pre-sale ownership verification","prompt":"Someone is trying to sell token ID 3301 from the Azuki collection at contract 0xED5AF388...1234 on Ethereum — can you confirm who actually owns that token right now?"}],"resultDescription":"Returns the current owner's wallet address for the specified ERC-721 NFT token, identified by contract address and token ID on the requested EVM chain (Ethereum, Base, Arbitrum, Optimism, or Polygon).","failureModes":["Invalid contract address returns an error or null owner","Token ID does not exist on the contract (reverts on-chain)","Unsupported chain name returns a validation error","Network/RPC timeout causes a failed response","Contract is not ERC-721 compliant and does not support ownerOf"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-call on-chain ownership lookup for a single ERC-721 NFT without setting up your own RPC node. Ideal for token gating, airdrop verification, and pre-sale ownership checks across Ethereum, Base, Arbitrum, Optimism, and Polygon. Prefer this over indexer APIs when you need real-time on-chain accuracy rather than indexed data that may lag.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T12:32:47.180Z","isFirstParty":false,"canonicalSlug":"nft-owner-lookup-335a7b63"}