{"uid":"cap_iioK1DH5xpJAoDPXcckiB","slug":"base-nft-owner-b486b3c5","name":"Base NFT Owner","description":"Who owns this Base ERC721 token right now? Returns the current owner address at a pinned block. A token with no owner is refused before payment rather than returned as the zero address, which a caller could otherwise mistake for a real holder.","url":"https://api.zfinia.com/x402/v1/base-nft-owner?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"contract":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"ERC721 contract address."},"token_id":{"type":"string","pattern":"^\\d{1,78}$","description":"Token id as a decimal string."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nIUfbwZzN97cFxq41QIgv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","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 a Base ERC721 token at a pinned block, refusing tokens with no owner rather than returning the zero address.","exampleAgentPrompt":"Who currently owns token ID 1234 from the ERC721 contract 0xAbCd1234abcd1234abcd1234abcd1234abcd1234 on Base? I need the owner's wallet address.","exampleUseCases":[{"title":"Verify NFT ownership before a sale","prompt":"Before I proceed with this P2P sale, can you confirm who currently owns token ID 42 from the Base NFT contract 0xDEAD000000000000000042069000000000000000? I want to make sure the seller actually holds it."},{"title":"Gate access by NFT ownership","prompt":"Check if token ID 7 from the Base ERC721 contract 0xBEEFBEEFbeefbeefbeefbeefbeefbeefbeefbeef currently has an owner — I need the wallet address to grant them access to my platform."},{"title":"Audit NFT holder for airdrop eligibility","prompt":"I'm preparing an airdrop and need to know who holds token ID 999 from Base contract 0xCAFECAFEcafecafecafecafecafecafecafecafe right now so I can send them the reward."}],"resultDescription":"The endpoint returns the current owner's wallet address (a 0x-prefixed Ethereum address) for the specified ERC721 token on Base, pinned to a recent block. If the token has no owner (e.g. burned or never minted), the request is rejected before payment is charged, preventing the caller from receiving a misleading zero address.","failureModes":["Token has no owner (burned or unminted) — request is refused before payment is taken","Invalid contract address format — rejected by input validation","Invalid token ID format — rejected by input validation","Contract is not a valid ERC721 contract — may return an error or revert","Network/RPC unavailability — service returns an error response","Token ID out of range for the contract — contract call reverts"],"whenToPreferThis":"Choose this endpoint when you need to resolve the current on-chain owner of a specific ERC721 token on the Base L2 network and want safe handling of ownerless tokens (no misleading zero-address returns). Prefer it over raw RPC calls when you need a pay-per-call, no-infrastructure approach. Best suited for single-token lookups; not designed for bulk ownership queries or non-Base chains.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:40:52.110Z","isFirstParty":false,"canonicalSlug":"base-nft-owner-b486b3c5"}