{"uid":"cap_ddKZRbo8_0P11n4dVDqke","slug":"erc-721-token-lookup-by-owner-3ebd45bc","name":"ERC-721 Token Lookup by Owner","description":"Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.","url":"https://anibalb.duckdns.org/x402/erc721-tokens?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","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"count":2,"owner":"0x...","tokens":[{"token_id":"1","token_uri":"ipfs://..."}]}},"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_onX3cYYtgX5X2_hclTruG","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 all ERC-721 NFT tokens held by a given wallet address on a specified contract, including token IDs and URIs.","exampleAgentPrompt":"Can you look up all the ERC-721 NFTs owned by wallet address 0xAbC...123 on the Bored Ape Yacht Club contract and show me each token ID and its metadata URI?","exampleUseCases":[{"title":"NFT portfolio audit for a wallet","prompt":"Show me all the ERC-721 tokens held by wallet 0x1234...abcd — I want the token IDs and their metadata URIs so I can audit the collection."},{"title":"Verify NFT ownership before granting access","prompt":"Check whether wallet 0xDead...Beef holds any tokens from contract 0xBC4C...A1B2 — I need to verify they actually own an NFT before I let them into the members area."},{"title":"Inventory an NFT collection for resale","prompt":"List every ERC-721 token owned by 0x9999...FFFF on the CryptoPunks contract, with their token IDs and URIs, so I can prep a resale inventory."}],"resultDescription":"A JSON object containing the owner address, a count of tokens held, and an array of token objects each with a token_id and token_uri (e.g. an IPFS link to metadata).","failureModes":["Invalid or checksumless wallet address returns an error or empty result","Contract address not an ERC-721 contract returns empty or error","Rate limiting or payment failure (x402 USDC payment not accepted) returns 402","Network/RPC timeout if the blockchain node is unreachable","Wallet holds zero tokens — returns count:0 and empty tokens array"],"whenToPreferThis":"Use this endpoint when you need a quick, no-account onchain lookup of ERC-721 token holdings for a specific wallet, especially in a pay-per-call context where you don't want to maintain API keys or subscriptions. Prefer it over indexers like Alchemy/Moralis NFT APIs when minimizing setup overhead and paying micro-amounts per call via x402 USDC is acceptable. Best for spot checks, ownership verification, or lightweight NFT portfolio reads.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:44.012Z","isFirstParty":false,"canonicalSlug":"erc-721-token-lookup-by-owner-3ebd45bc"}