{"id":"15944d65-3478-410a-9ce8-a54e01d074ee","shortId":"qFUgPD","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 #34 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 payment proof.\n\nThe broader lowpaymentfee.com platform offers a suite 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 Base via USDC.\n\nThis specific endpoint (`/api/v1/nfts/34/owner`) accepts POST requests and returns JSON. The response schema is not documented, but the endpoint is live and returns a standard x402 challenge when called without payment. No OpenAPI spec or detailed documentation was found during crawling; the provider's landing page is the primary source of information.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-call","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","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are undocumented","Endpoint is specific to NFT #34; unclear if other NFT IDs are supported via parameterized routes","No crawled documentation beyond the landing page; /api, /pricing, and /README pages returned no useful content","Response schema is entirely unknown — cannot confirm what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/34/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/34/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, but there is no OpenAPI spec, no documented request/response schema, no examples, and the crawled pages beyond the landing page returned only 'Connect wallet' stubs. The endpoint's actual behavior and response format are 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'0.02':11,24,73,142 '000':63 '20':62 '34':36 '6':69 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':155 'advertis':58 'ai/ml':113 'analysi':116 'analyt':112 'api':77 'attach':87 'base':9,22,53,64,148 'base-network' 'broader':99 'call':42,179 'caller':85 'challeng':57,177 'classif':118 'convers':135 'crawl':191 'data':4,17,111,121 'decim':70 'detail':186 'document':166,187 'embed':119 'endpoint':28,109,138,153,169 'equal':72 'estim':129 'exchang':124 'feed':123 'finance/web3':120 'found':189 'gas':128 'gate':108 'generat':136 'geocod':133 'header':92 'infer':114 'inform':202 'infrastructur':131 'json':160 'json-response' 'key':78 'land':195 'limit':80 'list':140 'live':171 'lowpaymentfee' 'lowpaymentfee.com':30,100 'maxamountrequir':60 'micropay':7,20 'network':54 'nft':2,15,35 'nft-ownership-lookup' 'no-api-key' 'offer':102 'on-chain NFT data' 'openapi':183 'owner':33 'ownership':3,16 'page':196 'pay':40 'pay-per-cal':39 'pay-per-call' 'payment':46,91,96,181 'per':12,25,41,74,143 'platform':101 'post':156 'price':122 'primari':199 'proof':97 'protocol':44 'provid':193 'queri':1,14 'quot':127 'rate':79,125 'request':13,26,75,144,157 'requir':84 'respons':162 'return':31,159,173 'schema':163 'sentiment':115 'settl':48,146 'simpli':86 'sinc':66 'sourc':200 'span':110 'spec':184 'specif':152 'standard':175 'subscript':82 'suit':104 'summar':117 'token':126 'token owner query' 'unit':65 'usdc':50,67,150 'usdc-payment' 'use':68 'util':132 'valid':95,134 'via':5,18,37,149 'without':180 'x':90 'x-payment':89 'x402':6,19,43,56,107,176 'x402 NFT endpoint' 'x402-gated':106 'x402-micropayment'","prices":[{"id":"caa1daf9-07a1-4c4e-888f-94cdfa34b2c5","listingId":"15944d65-3478-410a-9ce8-a54e01d074ee","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/34/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":"2026-04-21T18:32:28.140Z"}],"sources":[{"listingId":"15944d65-3478-410a-9ce8-a54e01d074ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/34/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.140Z","lastSeenAt":"2026-04-22T16:32:58.710Z"}],"details":{"listingId":"15944d65-3478-410a-9ce8-a54e01d074ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/34/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/34/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/34/owner"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The 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 trackers that need ownership verification","Agent-driven workflows that need to verify NFT ownership before executing downstream logic"],"bestFor":["Developers needing simple pay-per-call NFT ownership data without API key management","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic queries where subscription pricing is wasteful"],"notFor":["Bulk NFT ownership queries across large collections (single-NFT endpoint, no batch support evident)","Users who cannot settle USDC payments on the Base network","Applications requiring detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.187Z"},"updatedAt":"2026-04-22T16:32:58.710Z"}}