{"id":"b51a4901-0c23-4431-86ea-f6365094a95e","shortId":"gqRN3r","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 #46. It is part of a broader suite of x402-protocol pay-per-call APIs hosted on the same domain, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02 per-request pricing model settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/nfts/46/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 advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimal places. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation is minimal — the provider's landing page lists available endpoints and pricing but does not provide request/response schemas, parameter descriptions, or example payloads for this specific NFT endpoint. The endpoint is live and returns a proper 402 challenge, confirming it is operational.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","who owns NFT","token holder query","x402 NFT API","Base USDC micropayment API"],"warnings":["No request or response schema available — input parameters and output format are unknown.","Endpoint is hardcoded to NFT #46; unclear if other NFT IDs are supported via similar paths.","No documentation beyond the landing page; /api, /pricing, and /README pages all just show 'Connect wallet'.","The broader platform lists many API categories (AI, finance, infrastructure) but none appear to be documented in detail."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/46/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/46/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 with clear pricing. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific functionality (NFT #46 owner) is narrow and undocumented, making this effectively a stub 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'0.02':11,24,76,138 '000':127 '0x8335':132 '20':126 '2913':133 '402':196 '46':37 '6':142 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':93 'access':153 'advertis':122,152 'ai/ml':62 'analyt':61 'api':53,146 'avail':168 'base':9,22,87,128,135 'base-network' 'broader':43 'call':52 'caller':106 'challeng':121,197 'confirm':198 'data':4,17,60 'decim':143 'descript':179 'document':159 'domain':58 'endpoint':28,69,91,169,187,189 'equal':137 'exampl':181 'finance/web3':64 'gate':155 'given':139 'handl':101 'header':113 'host':54 'includ':108 'infer':63 'inform':34 'infrastructur':66 'json':98 'key':147 'land':165 'limit':150 'list':167 'live':191 'lowpaymentfee.com':30 'maxamountrequir':124 'micropay':7,20,158 'minim':161 'model':81 'must':107 'network':88 'nft':2,15,32,36,186 'nft-ownership-lookup' 'no-api-key' 'oper':201 'ownership':3,16,33 'page':166 'paramet':178 'part':40 'pay':50 'pay-per-cal':49 'pay-per-request' 'payload':182 'payment':99,112,117 'per':12,25,51,78 'per-request':77 'place':144 'platform':72 'post':94 'price':80,171 'proof':118 'proper':195 'protocol':48,105 'provid':163,175 'pure':156 'queri':1,14 'rate':149 'request':13,26,79,95 'request/response':176 'return':31,97,193 'schema':177 'settl':82 'share':73 'span':59 'specif':90,185 'suit':44 'token holder query' 'uniform':75 'unit':129 'usdc':84,131,140 'usdc-payment' 'util':67 'valid':116 'via':5,18,102 'who owns NFT' 'x':111 'x-payment':110 'x402':6,19,47,104,120 'x402 NFT API' 'x402-micropayment' 'x402-protocol':46","prices":[{"id":"99515535-940c-4a83-bed6-8c6a36833945","listingId":"b51a4901-0c23-4431-86ea-f6365094a95e","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/46/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":"2026-04-21T18:32:28.135Z"}],"sources":[{"listingId":"b51a4901-0c23-4431-86ea-f6365094a95e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/46/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.135Z","lastSeenAt":"2026-04-22T16:32:58.682Z"}],"details":{"listingId":"b51a4901-0c23-4431-86ea-f6365094a95e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/46/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 a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/46/owner"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/46/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building NFT portfolio dashboards that need on-demand ownership checks","Agent workflows that 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 micropayments on Base","Low-volume or sporadic NFT ownership queries where subscription pricing is wasteful"],"notFor":["Bulk enumeration of all NFT owners across a collection (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":"2026-04-22T16:32:58.682Z"}}