{"id":"c6019a6f-1cbd-4e33-be20-8346f8ab6a14","shortId":"AMGj3c","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 (ID 19) via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled in USDC on the Base network. Each call costs a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 USD. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of x402-gated APIs 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 uniformly priced at $0.02 per request and settle on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/19/owner` is not listed on the provider's landing page among the advertised API categories, so its exact response schema and the nature of the NFT it references are unclear. The x402 challenge confirms it is live and accepting payment, but no documentation or example responses are available for this particular route.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-settlement","base-network","pay-per-call","no-api-key","post-request"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","pay-per-request NFT data","lowpaymentfee NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/nfts/19/owner path is not listed among the provider's advertised API categories — it may be experimental or undocumented","No example response body is available; the actual data returned is unknown","The endpoint is hardcoded to NFT ID 19; it is unclear whether other NFT IDs are supported at similar paths"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/19/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/19/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and settlement details, but there is no OpenAPI schema, no documented request/response format, and the specific NFT endpoint is not listed among the provider's advertised APIs. The response body structure must be guessed. This is effectively a stub 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'0.02':11,24,79,149 '000':70 '19':40 '20':69 '6':75 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':51,201 'advertis':175 'ai/ml':119 'among':173 'analysi':122 'analyt':118 'api':82,115,176 'attach':92 'avail':210 'base':9,22,61,71,156 'base-network' 'broader':109 'call':46,64 'caller':90 'categori':177 'challeng':195 'classif':124 'confirm':196 'convers':141 'cost':65 'data':4,17,117,127 'decim':76 'document':205 'embed':125 'endpoint':28,50,144,162 'equal':78 'estim':135 'exact':180 'exampl':207 'exchang':130 'feed':129 'finance/web3':126 'gas':134 'gate':114 'generat':142 'geocod':139 'header':97 'host':107 'id':39 'infer':120 'inform':34 'infrastructur':137 'key':83 'land':171 'limit':85 'list':166 'live':199 'lowpaymentfee NFT' 'lowpaymentfee.com':30,106 'maximum':67 'micropay':7,20 'natur':185 'network':62,157 'nft':2,15,32,38,188 'nft-ownership-query' 'no-api-key' 'ownership':3,16,33 'page':172 'particular':213 'pay':44 'pay-per-cal':43 'pay-per-call' 'pay-per-request NFT data' 'payment':96,102,202 'per':12,25,45,150 'post':52 'post-request' 'price':128,147 'proof':103 'protocol':48 'provid':105,169 'queri':1,14 'quot':133 'rate':84,131 'refer':190 'request':13,26,53,151 'requir':89 'respons':181,208 'return':31 'rout':214 'schema':182 'sentiment':121 'settl':56,153 'simpli':91 'span':116 'specif':37,161 'subscript':87 'suit':110 'summar':123 'token':132 'unclear':192 'uniform':146 'unit':72 'usd':80 'usdc':58,74,159 'usdc-settlement' 'use':158 'util':138 'valid':100,140 'via':5,18,41 'x':95 'x-payment':94 'x402':6,19,47,101,113,194 'x402 NFT endpoint' 'x402-gated':112 'x402-micropayment'","prices":[{"id":"5b19a5ee-b17f-4f70-80a9-be953788c5d5","listingId":"c6019a6f-1cbd-4e33-be20-8346f8ab6a14","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/19/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":"2026-04-21T18:32:27.543Z"}],"sources":[{"listingId":"c6019a6f-1cbd-4e33-be20-8346f8ab6a14","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/19/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.543Z","lastSeenAt":"2026-04-22T21:32:16.251Z"}],"details":{"listingId":"c6019a6f-1cbd-4e33-be20-8346f8ab6a14","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/19/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 endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/19/owner"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/19/owner"},{"claim":"The provider advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure but does not list an NFT endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Verifying NFT provenance or ownership as part of a Web3 application"],"bestFor":["Agents or bots that need on-demand NFT ownership data without subscription overhead","Developers prototyping x402 payment flows on Base","Low-volume, pay-as-you-go NFT data lookups"],"notFor":["Bulk or high-throughput NFT indexing across many token IDs","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":"2026-02-17T23:12:59.324Z"},"updatedAt":"2026-04-22T21:32:16.251Z"}}