{"uid":"cap_dpzj8c1anNh-H7w4Swj7_","slug":"saylor-innovations-nft-owner-lookup-erc-721-ethereum-eb688646","name":"Saylor Innovations NFT Owner Lookup (ERC-721, Ethereum)","description":"NFT Owner (ERC-721) (ethereum). NFT owner (ERC-721 ownerOf) for any collection on Base, Ethereum, Arbitrum, Optimism or Polygon.","url":"https://saylorinnovations.com/api/evm/ethereum/nft-owner/:address/1?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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_-lXZMrx2xcLRFUYEhSv-c","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the current owner address of a specific ERC-721 NFT token on Ethereum given a contract address and token ID","exampleAgentPrompt":"Who currently owns token ID 1 of the ERC-721 NFT contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum? Look it up on-chain and give me the owner's wallet address.","exampleUseCases":[{"title":"Verify NFT ownership before gating access","prompt":"Before granting this user access to our members-only area, can you check on-chain whether wallet 0xABC123... actually owns token ID 42 of the NFT contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum?"},{"title":"Track who holds a specific NFT token","prompt":"I want to know who currently holds token ID 1 of the Bored Ape Yacht Club contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum — pull the owner's wallet address from the blockchain."},{"title":"NFT provenance check before purchase","prompt":"I'm thinking of buying this NFT — can you check on-chain who currently owns token ID 7 of the ERC-721 contract at 0x23581767a106ae21c074b2276D25e5C3e136a68e on Ethereum so I can verify the seller is the real owner?"}],"resultDescription":"Returns the current on-chain owner wallet address of the specified ERC-721 token on Ethereum, sourced directly from blockchain state. Includes the owner's Ethereum address for the given contract and token ID.","failureModes":["Invalid contract address returns an error or null owner","Token ID does not exist on the contract returns a not-found or zero-address response","Contract address is not an ERC-721 contract returns an error","Network congestion or node unavailability may cause timeouts","Malformed address format returns a validation error"],"whenToPreferThis":"Use this endpoint when you need a direct on-chain lookup of who currently owns a specific ERC-721 NFT token on Ethereum. Prefer this over indexers or marketplaces when you need authoritative, real-time blockchain state rather than potentially stale cached data. Ideal for ownership verification, access gating, and provenance checks on Ethereum mainnet.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T00:48:23.708Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-nft-owner-lookup-erc-721-ethereum-eb688646"}