{"id":"af48cf14-1af4-4a21-830d-947029e31815","shortId":"pVmWQc","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 ID 24. It is part of a broader suite of x402-protocol APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys or account registration are required — access is granted purely through per-call micropayment. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base, using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.\n\nDocumentation beyond the landing page is sparse. There is no OpenAPI spec, no detailed request/response schema, and the crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. The exact request body format and response structure for this NFT owner endpoint are not documented in the available material.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","per-call-pricing","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","NFT metadata","x402 NFT API","Base USDC micropayment API"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are unknown.","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet').","Endpoint is scoped to a single NFT ID (24); it is unclear how to query other NFT IDs.","The provider landing page lists many API categories but none specifically mention NFT endpoints, suggesting this may be a demo or test endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/24/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/24/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no examples, and the crawled docs pages are empty. The specific functionality (NFT 24 owner) is narrow and undocumented beyond the URL 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'/pricing':180 '/readme':182 '0.02':11,24,76,122 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':159 '20':115 '24':38 '6':126 'Base USDC micropayment API' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'accept':88 'access':136 'account':132 'addit':193 'address':150 'ai/ml':59 'analyt':58 'api':50,129 'avail':213 'base':9,22,84,117,153 'base-network' 'beyond':161 'bodi':198 'broader':44 'call':143 'caller':101 'connect':188 'content':194 'contract':157 'crawl':178 'data':4,17,57 'decim':127 'detail':173 'direct':148 'document':160,210 'endpoint':28,66,87,207 'exact':196 'finance/web3':61 'format':199 'grant':138 'handl':96 'header':107 'i.e':121 'id':37 'includ':102 'infer':60 'inform':34 'infrastructur':63 'json':93 'key':130 'land':163 'lowpaymentfee.com':30 'materi':214 'micropay':7,20,144 'model':74 'network':85 'nft':2,15,32,36,205 'nft-ownership-lookup' 'no-api-key' 'offer':51 'openapi':170 'owner':206 'ownership':3,16,33 'page':164,183 'part':41 'payment':94,106,111,146 'per':12,25,77,142 'per-cal':141 'per-call-pricing' 'platform':69 'post':89 'price':73 'prompt':190 'protocol':49,100 'provid':55 'pure':139 'queri':1,14 'registr':133 'request':13,26,78,90,197 'request/response':174 'requir':135 'respons':201 'return':31,92,185 'schema':175 'settl':79 'share':70 'sign':110 'sinc':123 'span':56 'spars':166 'spec':171 'structur':202 'suit':45 'token holder query' 'uniform':72 'unit':118 'usdc':81,120,124,156 'usdc-payment' 'use':125,154 'util':64 'via':5,18,97 'wallet':189 'x':105 'x-payment':104 'x402':6,19,48,99 'x402 NFT API' 'x402-micropayment' 'x402-protocol':47","prices":[{"id":"121e7190-300e-4e9a-8767-4cd6526cd7f0","listingId":"af48cf14-1af4-4a21-830d-947029e31815","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/24/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":"2026-04-21T18:32:27.925Z"}],"sources":[{"listingId":"af48cf14-1af4-4a21-830d-947029e31815","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/24/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.925Z","lastSeenAt":"2026-04-22T18:33:27.412Z"}],"details":{"listingId":"af48cf14-1af4-4a21-830d-947029e31815","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/24/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","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 payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/24/owner"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/24/owner"},{"claim":"Payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/nfts/24/owner"}],"useCases":["Querying the current owner of a specific NFT (ID 24) programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building Web3 applications that verify NFT holders via micropaid API calls"],"bestFor":["Agents or apps needing on-demand NFT ownership data without subscription commitments","Developers who prefer pay-per-call crypto micropayments over traditional API keys","Low-volume or bursty NFT ownership queries where flat-rate plans are wasteful"],"notFor":["High-volume bulk NFT indexing (no documented batch endpoint; per-call cost adds up)","Users without a Base-network USDC wallet or x402-compatible client","Querying arbitrary NFT IDs (this endpoint is scoped to NFT ID 24; other IDs may require different paths)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.569Z"},"updatedAt":"2026-04-22T18:33:27.412Z"}}