{"id":"46de46ac-17a8-4afd-a66e-c1d52cc78225","shortId":"yq5wMZ","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 the owner of NFT #71 via a pay-per-call x402 protocol. The payment is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform hosts a variety of x402-gated endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network in USDC.\n\nThis specific endpoint (/api/v1/nfts/71/owner) is a POST endpoint that returns JSON. The exact response schema is not documented, so the structure of the owner data returned is unknown. The endpoint is live and returning a proper 402 challenge as expected for x402 protocol.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","token owner query"],"warnings":["No response schema or example response documented — the structure of the returned owner data is unknown.","No request body schema documented — unclear what (if any) POST body is expected.","Endpoint path is hardcoded to NFT #71; it is unclear whether other NFT IDs are supported or how to parameterize.","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The platform lists many endpoint categories but none appear to have detailed docs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/71/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/71/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 402 challenge, confirming it works. However, there is no OpenAPI schema, no documented request body format, no example response, and the endpoint path is hardcoded to NFT #71 with no indication of parameterization. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful 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'0.02':11,24,73,143 '000':63 '20':62 '402':190 '6':69 '71':36 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'advertis':58 'ai/ml':114 'analysi':117 'analyt':113 'api':77 'attach':87 'base':9,22,53,64,150 'base-network' 'broader':100 'call':42 'caller':85 'challeng':57,191 'classif':119 'convers':136 'data':4,17,112,122,178 'decim':70 'document':171 'embed':120 'endpoint':28,110,139,156,161,183 'equal':72 'estim':130 'exact':166 'exchang':125 'expect':193 'feed':124 'finance/web3':121 'gas':129 'gate':109 'generat':137 'geocod':134 'header':92 'host':103 'infer':115 'infrastructur':132 'json':164 'json-response' 'key':78 'limit':80 'list':141 'live':185 'lowpaymentfee.com':30,101 'maxamountrequir':60 'micropay':7,20 'network':54,151 'nft':2,15,35 'nft-ownership-lookup' 'no-api-key' 'on-chain NFT data' 'owner':33,177 'ownership':3,16 'pay':40 'pay-per-cal':39 'pay-per-request' 'payment':46,91,97 'per':12,25,41,74,144 'platform':102 'post':160 'price':123 'proof':98 'proper':189 'protocol':44,196 'queri':1,14 'quot':128 'rate':79,126 'request':13,26,75,145 'requir':84 'respons':167 'return':31,163,179,187 'schema':168 'sentiment':116 'settl':48,147 'simpli':86 'sinc':66 'span':111 'specif':155 'structur':174 'subscript':82 'summar':118 'token':127 'token owner query' 'unit':65 'unknown':181 'usdc':50,67,153 'usdc-payment' 'use':68 'util':133 'valid':95,135 'varieti':105 'via':5,18,37 'x':90 'x-payment':89 'x402':6,19,43,56,96,108,195 'x402 NFT endpoint' 'x402-gated':107 'x402-micropayment'","prices":[{"id":"0f343c66-f254-47dc-9c77-67ff256b4f8a","listingId":"46de46ac-17a8-4afd-a66e-c1d52cc78225","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/71/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":"2026-04-21T18:32:28.611Z"}],"sources":[{"listingId":"46de46ac-17a8-4afd-a66e-c1d52cc78225","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/71/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.611Z","lastSeenAt":"2026-04-22T13:32:33.893Z"}],"details":{"listingId":"46de46ac-17a8-4afd-a66e-c1d52cc78225","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/71/owner \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/71/owner"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/71/owner"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building NFT portfolio dashboards that need ownership verification","Agent-driven workflows that need to verify NFT ownership before taking action"],"bestFor":["Agents needing quick NFT ownership checks without API key setup","Pay-per-use NFT data queries settled in USDC on Base","Lightweight integrations that want to avoid subscription overhead"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-NFT endpoint)","Querying NFTs on networks other than Base","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.421Z"},"updatedAt":"2026-04-22T13:32:33.893Z"}}