{"uid":"cap_FHY3Bcx9VSNfnIAj4ViSE","slug":"base-nft-owner-1ab59fea","name":"base-nft-owner","description":"Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).","url":"https://x402.agentindex.world/base/nft-owner?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"token":{"type":"string","title":"Token"},"token_id":{"type":"integer","title":"Token Id","minimum":0}}},"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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ebCjUHChBzwBMDGNtP4g4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","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 wallet address of a specific ERC721 NFT on Base mainnet by calling ownerOf(tokenId).","exampleAgentPrompt":"Who owns token ID 1337 of the NFT contract 0xd4307e0acd12cf46fd6cf93bc264f5d5d1598792 on Base mainnet?","exampleUseCases":[{"title":"Verify NFT ownership before granting access","prompt":"Check who currently owns token ID 88 of the contract 0xabcdef1234567890abcdef1234567890abcdef12 on Base — I need to confirm if wallet 0xUser123 is the rightful holder before giving them access."},{"title":"Track NFT transfer after marketplace sale","prompt":"I just sold token ID 5 from contract 0x1234567890abcdef1234567890abcdef12345678 on Base — can you confirm who the new owner is now?"},{"title":"Display NFT owner on a collector dashboard","prompt":"For my NFT gallery dashboard, who holds token ID 200 of the Base NFT contract 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef right now?"}],"resultDescription":"Returns the wallet address (Ethereum address string) of the current owner of the specified ERC721 token on Base mainnet, as returned by the contract's ownerOf(tokenId) function.","failureModes":["Token ID does not exist or has not been minted — contract reverts, returns error","Invalid or non-ERC721 contract address provided","Contract address is not deployed on Base mainnet","Token has been burned — ownerOf may revert or return zero address","Network RPC timeout or Base node unavailability"],"whenToPreferThis":"Use this endpoint when you need to resolve the current owner of a specific ERC721 NFT on Base mainnet and have both the contract address and token ID. Prefer this over generic blockchain explorers when you need a programmatic, pay-per-call lookup without maintaining RPC infrastructure or API keys.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T12:37:51.123Z","isFirstParty":false,"canonicalSlug":"base-nft-owner-1ab59fea"}