{"id":"4a3b85ef-0989-41de-9bfc-23f3f953c229","shortId":"NPxNV4","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 NFT #36. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/36/owner` accepts POST requests and is gated by an x402 payment challenge. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys or rate limits are advertised; access is instant once payment is included in the `X-PAYMENT` header.\n\nDocumentation is minimal — there is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema` stub, and no examples of what the response payload looks like. The platform landing page lists many other endpoints (analytics, AI, finance, utilities) all at the same $0.02 price point, but details on request parameters and response formats are not provided for any of them.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","base-network","usdc-settlement","pay-per-request"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC API","micropayment NFT query","lowpaymentfee NFT"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown.","Only NFT #36 is confirmed; it is unclear whether other NFT IDs are supported at similar paths.","The platform lists many other endpoints but none have detailed docs; overall documentation quality is very low.","No robots.txt or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/36/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/36/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 parameters, no example responses, and no description of what the NFT ownership response actually contains. The listing is effectively a stub with only the payment challenge to go 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'0.02':11,24,99,181 '000':90 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':107 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':89 '36':37 '6':95 'Base USDC API' 'NFT owner lookup' 'NFT ownership API' 'accept':75 'access':124 'across':51 'address':106 'advertis':123 'ai':174 'ai/ml':54 'analyt':53,173 'api':50,117 'base':9,22,67,91,109 'base-network' 'beyond':148 'broader':43 'call':49 'categori':58 'challeng':85,151 'contract':113 'data':4,17,52 'decim':96 'detail':185 'document':137 'endpoint':28,73,172 'equal':98 'exampl':157 'financ':175 'finance/web3':55 'format':191 'gate':80 'header':136 'includ':130 'inform':34 'infrastructur':57 'instant':126 'key':118 'land':167 'like':164 'limit':121 'list':169 'look':163 'lowpaymentfee NFT' 'lowpaymentfee.com':30 'made':104 'mani':170 'micropay':7,20 'micropayment NFT query' 'minim':139 'network':68 'nft':2,15,32,36 'nft-ownership-lookup' 'offer':45 'openapi':143 'outputschema':153 'ownership':3,16,33 'page':168 'paramet':188 'part':40 'pay':47 'pay-per-cal':46 'pay-per-request' 'payload':162 'payment':84,102,128,135 'per':12,25,48,100 'platform':44,166 'point':183 'post':76 'price':87,182 'protocol':64 'provid':194 'queri':1,14 'rate':120 'request':13,26,77,101,187 'request/response':146 'respons':161,190 'return':31 'schema':147 'settl':60 'spec':144 'specif':72 'stub':154 'unit':92 'usdc':70,94,112 'usdc-settlement' 'use':69,110 'util':176 'via':5,18,61 'x':134 'x-payment':133 'x402':6,19,63,83,150 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"d40c3d52-730d-43db-82fc-8057ad13ccca","listingId":"4a3b85ef-0989-41de-9bfc-23f3f953c229","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/36/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":"2026-04-21T18:32:33.034Z"}],"sources":[{"listingId":"4a3b85ef-0989-41de-9bfc-23f3f953c229","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/36/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.034Z","lastSeenAt":"2026-04-22T04:02:47.590Z"}],"details":{"listingId":"4a3b85ef-0989-41de-9bfc-23f3f953c229","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/36/owner \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base.","source_url":"https://lowpaymentfee.com/api/v1/nfts/36/owner"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/36/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into automated agent workflows","Verifying NFT holder status without managing API keys"],"bestFor":["Agents needing on-demand NFT ownership data with no subscription","Developers who want keyless, pay-per-call NFT queries on Base","Workflows requiring x402-compatible micropayment endpoints"],"notFor":["Bulk NFT collection scans (no batch endpoint documented)","Querying NFTs beyond ID 36 (only this specific resource path is confirmed live)","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.911Z"},"updatedAt":"2026-04-22T04:02:47.590Z"}}