{"id":"44084fb6-4343-4f17-8280-75110cb7e62d","shortId":"y75BTD","kind":"x402","title":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","tagline":"Query NFT ownership data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (token ID 20) via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all its API offerings.\n\nThe provider operates a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all at the same $0.02 price point. This particular endpoint sits in the NFT/Web3 category and returns JSON. No API keys or rate limits are advertised; access is granted purely through the x402 payment header mechanism using USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nDocumentation is minimal — the site provides no OpenAPI spec, no request/response schema details, and no example payloads beyond the endpoint listing. The endpoint is live (returns a proper 402 challenge), but the actual response format for a successful paid request is unknown from the available material.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token owner query","ERC-721 owner","NFT holder check","Web3 NFT API","on-chain NFT data"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","Site documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no content","The specific endpoint path (/api/v1/nfts/20/owner) is not listed on the provider's landing page catalog, raising questions about its discoverability and support status","No information on what data source backs the NFT ownership lookup"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/20/owner","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/20/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no documented request/response schema, no examples, and the site pages beyond the landing are empty wallet-connect stubs. The actual behavior of the endpoint upon successful payment is entirely 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'0.02':11,24,81,90,123 '000':72 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':160 '20':41,71 '402':189 '6':77 'ERC-721 owner' 'NFT holder check' 'NFT owner lookup' 'NFT ownership API' 'Web3 NFT API' 'accept':52 'access':145 'across':93 'actual':193 'advertis':67,144 'ai/ml':112 'analyt':111 'api':96,108,138 'avail':205 'base':9,22,62,73,158 'base-network' 'beyond':178 'broad':102 'call':47 'catalog':103 'categori':133 'challeng':66,190 'consist':84 'contract':159 'data':4,17,110,115 'decim':78 'detail':173 'document':161 'endpoint':28,51,128,180,183 'equal':80 'exampl':176 'finance/web3':114 'format':195 'gate':107 'grant':147 'header':153 'id':40 'infer':113 'inform':34 'infrastructur':117 'json':136 'key':139 'limit':142 'list':181 'live':185 'lowpaymentfee.com':30 'materi':206 'maxamountrequir':69 'mechan':154 'micropay':7,20 'minim':163 'network':63 'nft':2,15,32,38 'nft-ownership-lookup' 'nft/web3':132 'no-api-key' 'offer':97 'on-chain NFT data' 'openapi':168 'oper':100 'ownership':3,16,33 'paid':199 'particular':127 'pay':45 'pay-per-cal':44 'pay-per-request' 'payload':177 'payment':152 'per':12,25,46,82 'point':125 'post':53 'price':92,124 'proper':188 'protocol':49 'provid':99,166 'pure':148 'queri':1,14 'rate':141 'request':13,26,54,83,200 'request/response':171 'respons':194 'return':31,135,186 'schema':172 'settl':57 'sit':129 'site':87,165 'span':109 'spec':169 'specif':37 'success':198 'token':39 'token owner query' 'uniform':89 'unit':74 'unknown':202 'usdc':59,76,156 'usdc-settlement' 'use':155 'util':118 'via':5,18,42 'x402':6,19,48,65,106,151 'x402-gated':105 'x402-micropayment'","prices":[{"id":"dcbb1297-5231-496d-9f5f-6114ab8f93ff","listingId":"44084fb6-4343-4f17-8280-75110cb7e62d","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/20/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.721Z"}],"sources":[{"listingId":"44084fb6-4343-4f17-8280-75110cb7e62d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/20/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.721Z","lastSeenAt":"2026-04-22T19:33:08.564Z"}],"details":{"listingId":"44084fb6-4343-4f17-8280-75110cb7e62d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/20/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/20/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/20/owner"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Verifying NFT ownership as part of a token-gating workflow","Building dashboards that display NFT holder information","Automated agents checking NFT provenance before a transaction"],"bestFor":["Agents or apps needing quick, keyless NFT ownership checks","Developers who prefer pay-per-call over subscription API plans","Workflows already settled in USDC on Base"],"notFor":["Bulk enumeration of all NFT owners in a collection (single-token endpoint)","Use cases requiring detailed NFT metadata beyond ownership","Users who need free or testnet access before committing funds"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.952Z"},"updatedAt":"2026-04-22T19:33:08.564Z"}}