{"id":"1540311a-f536-4ce7-a14e-88bee47de1f9","shortId":"qjRQcf","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 #47. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol on the Base network using USDC. The endpoint accepts POST requests and returns JSON.\n\nThe x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme with no API keys, no rate limits, and no subscriptions required — just attach the appropriate X-PAYMENT header. The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the timeout window is 300 seconds.\n\nThe provider's landing page lists many other endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available for this specific NFT owner endpoint, so the exact request body format and response structure are unknown.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","base-network","usdc-settlement","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","who owns NFT","x402 NFT endpoint","Base USDC API","micropayment NFT query","token holder lookup"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response bodies documented — request format is unknown","Only NFT #47 is confirmed; unclear if other NFT IDs are supported at similar paths","Provider pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/47/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/47/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing, but there is no OpenAPI schema, no documentation of request/response formats, and no examples. The NFT owner endpoint's purpose is only inferable from the URL path. Effectively a stub 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'000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':93 '20':87 '2913':94 '300':143 '47':37 '6':104 'Base USDC API' 'NFT owner lookup' 'NFT ownership API' 'accept':68 'across':154 'ai/ml':156 'api':50,116 'appropri':128 'attach':126 'avail':179 'base':9,22,62,89,96 'base-network' 'bodi':190 'broader':43 'call':49 'categori':160 'challeng':76 'charg':83 'confirm':77 'data':4,17 'data/analytics':155 'decim':105 'detail':172 'document':173 'endpoint':28,67,79,153,185 'equal':98 'exact':112,188 'exampl':175 'finance/web3':157 'format':191 'header':132 'howev':168 'inform':34 'infrastructur':159 'json':73 'json-response' 'key':117 'land':148 'limit':120 'list':150 'live':81 'lowpaymentfee.com':30,53 'made':108 'mani':151 'maximum':85 'micropay':7,20 'micropayment NFT query' 'network':63 'nft':2,15,32,36,183 'nft-ownership-lookup' 'offer':51 'openapi':170 'owner':184 'ownership':3,16,33 'page':149 'part':40 'pay':47 'pay-per-cal':46 'pay-per-request' 'payload':177 'payment':106,131,134 'per':12,25,48,100 'point':167 'post':69 'price':166 'protocol':59 'provid':146 'queri':1,14 'rate':119 'recipi':135 'request':13,26,70,101,189 'request/response':176 'requir':124 'respons':193 'return':31,72 'schema':171 'scheme':113 'second':144 'settl':55 'specif':182 'structur':194 'subscript':123 'suit':44 'timeout':140 'token holder lookup' 'unit':90 'unknown':196 'usdc':65,92,102 'usdc-settlement' 'use':64,103 'via':5,18,56,109 'who owns NFT' 'window':141 'x':130 'x-payment':129 'x402':6,19,58,75,111 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"0bee543b-d102-4ae9-8a39-22a9c98554bf","listingId":"1540311a-f536-4ce7-a14e-88bee47de1f9","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/47/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":"2026-04-21T18:32:28.255Z"}],"sources":[{"listingId":"1540311a-f536-4ce7-a14e-88bee47de1f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/47/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.255Z","lastSeenAt":"2026-04-22T16:32:58.837Z"}],"details":{"listingId":"1540311a-f536-4ce7-a14e-88bee47de1f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/47/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/47/owner"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/nfts/47/owner"}],"useCases":["Checking the current owner of a specific NFT programmatically","Integrating NFT ownership verification into an agent workflow","Verifying NFT provenance or holder status without an API key"],"bestFor":["Agents needing quick, keyless NFT ownership checks","Developers prototyping x402 payment flows on Base","Low-volume, on-demand NFT data queries"],"notFor":["Bulk NFT collection scanning (no batch endpoint documented)","Querying NFTs beyond ID 47 (only this specific resource path is confirmed)","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.064Z"},"updatedAt":"2026-04-22T16:32:58.837Z"}}