{"id":"dbf22e9f-99bf-4c73-a166-922482712470","shortId":"jNFgT6","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 6. It is part of a broader suite of x402-protocol APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 data, 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 specific endpoint `/api/v1/nfts/6/owner` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge confirms the endpoint is live, advertising a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.\n\nDocumentation is minimal. The provider's landing page lists available API categories and pricing but does not provide request/response schemas, parameter descriptions, or usage examples for any endpoint. The NFT-related endpoints are not even listed on the homepage, so the exact response format and any required POST body fields are unknown. Callers should expect a JSON response containing owner address information, but the precise structure must be discovered empirically.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","per-request-pricing","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","who owns NFT","token holder query","ERC-721 owner","Base network NFT API","x402 NFT endpoint"],"warnings":["No request or response schema is documented for this endpoint.","The /api/v1/nfts/6/owner path is not listed among the provider's advertised APIs on the homepage, raising questions about its intended audience or stability.","No documentation pages could be crawled beyond the landing page (other pages only showed 'Connect wallet').","The exact POST body parameters (if any) are unknown and must be discovered by trial."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/6/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/6/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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no examples, and this specific NFT endpoint is not even listed on the provider's homepage. The listing is essentially a stub with confirmed 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'0.02':11,24,77,141 '000':130 '0x8335':135 '20':129 '2913':136 '6':38,145 'Base network NFT API' 'ERC-721 owner' 'NFT owner lookup' 'NFT ownership API' 'accept':91 'access':155 'address':225 'advertis':125,154 'ai/ml':59 'analyt':58 'api':50,148,174 'avail':173 'base':9,22,85,131,138 'base-network' 'bodi':213 'broader':44 'caller':104,217 'categori':175 'challeng':119 'confirm':120 'contain':223 'data':4,17,57,62 'decim':146 'descript':185 'discov':233 'document':164 'empir':234 'endpoint':28,67,89,122,191,196 'equal':140 'even':199 'exact':206 'exampl':188 'expect':219 'field':214 'finance/web3':61 'format':208 'gate':157 'given':142 'handl':99 'header':111 'homepag':203 'id':37 'includ':106 'infer':60 'inform':34,226 'infrastructur':64 'json':96,221 'json-response' 'key':149 'land':170 'limit':152 'list':172,200 'live':124 'lowpaymentfee.com':30 'maxamountrequir':127 'micropay':7,20,163 'minim':166 'model':75 'must':105,231 'network':86 'nft':2,15,32,36,194 'nft-ownership-lookup' 'nft-relat':193 'no-api-key' 'offer':51 'owner':224 'ownership':3,16,33 'page':171 'paramet':184 'part':41 'payment':97,110,115 'per':12,25,78,161 'per-request':160 'per-request-pricing' 'platform':70 'post':92,212 'precis':229 'price':74,177 'proof':116 'protocol':49,103 'provid':55,168,181 'pure':158 'queri':1,14 'rate':151 'relat':195 'request':13,26,79,93,162 'request/response':182 'requir':211 'respons':207,222 'return':31,95 'schema':183 'settl':80 'share':71 'span':56 'specif':88 'structur':230 'suit':45 'token holder query' 'uniform':73 'unit':132 'unknown':216 'usag':187 'usdc':82,134,143 'usdc-settlement' 'util':65 'valid':114 'via':5,18,100 'who owns NFT' 'x':109 'x-payment':108 'x402':6,19,48,102,118 'x402 NFT endpoint' 'x402-micropayment' 'x402-protocol':47","prices":[{"id":"aff8e8f8-b79e-49e3-92ac-b56ed2d9749c","listingId":"dbf22e9f-99bf-4c73-a166-922482712470","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/6/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":"2026-04-21T18:32:32.973Z"}],"sources":[{"listingId":"dbf22e9f-99bf-4c73-a166-922482712470","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/6/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.973Z","lastSeenAt":"2026-04-22T04:02:47.525Z"}],"details":{"listingId":"dbf22e9f-99bf-4c73-a166-922482712470","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/6/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 returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/6/owner"},{"claim":"All listed APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC uses 6 decimals, so 20000 base units equals $0.02.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building NFT portfolio dashboards that need on-demand ownership verification","Agent-driven workflows that verify NFT ownership before executing downstream logic"],"bestFor":["Developers needing simple, keyless NFT ownership queries","AI agents that can settle x402 micropayments on Base","Low-volume or sporadic lookups where per-call pricing beats subscriptions"],"notFor":["Bulk enumeration of all NFT owners across a collection (no batch endpoint documented)","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":"2026-02-17T23:12:50.121Z"},"updatedAt":"2026-04-22T04:02:47.525Z"}}