{"id":"c406c202-ddda-4eef-99ab-8ea505f09220","shortId":"QQdvZS","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 15. 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 utility services. 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/15/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 landing page lists available endpoints with prices but provides no request/response schemas, parameter descriptions, or usage examples beyond the endpoint paths themselves. The NFT-specific endpoint is not listed on the homepage, suggesting it may be part of a larger NFT API surface that is not fully documented. The endpoint is live and returns a proper 402 challenge.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","pay-per-call NFT data","token ownership query"],"warnings":["No request or response schema is documented; the shape of the returned JSON is unknown.","The /api/v1/nfts/15/owner endpoint is not listed on the provider's homepage — it may be undocumented or experimental.","No documentation pages rendered meaningful content (pricing, README, and /api pages all just show 'Connect wallet').","It is unclear whether this endpoint returns live on-chain data or static/mock data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/15/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/15/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, confirming it is operational. However, there is no OpenAPI schema, no documented request/response format, no examples, and the NFT endpoint isn't even listed on the provider's homepage. The actual data returned is 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'0.02':11,24,77,139 '000':128 '0x8335':133 '15':38 '20':127 '2913':134 '402':221 '6':143 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':94 'access':154 'advertis':123,153 'ai/ml':63 'analyt':62 'api':54,147,206 'avail':167 'base':9,22,88,129,136 'base-network' 'beyond':181 'broader':44 'call':53 'caller':107 'challeng':122,222 'data':4,17,61 'decim':144 'descript':177 'document':160,212 'domain':59 'endpoint':28,70,92,168,183,190,214 'equal':138 'exampl':180 'finance/web3':65 'fulli':211 'gate':156 'given':140 'handl':102 'header':114 'homepag':196 'host':55 'id':37 'includ':109 'infer':64 'inform':34 'json':99 'json-response' 'key':148 'land':164 'larger':204 'limit':151 'list':166,193 'live':216 'lowpaymentfee.com':30 'maxamountrequir':125 'may':199 'micropay':7,20,159 'minim':162 'model':82 'must':108 'network':89 'nft':2,15,32,36,188,205 'nft-ownership-query' 'nft-specif':187 'no-api-key' 'ownership':3,16,33 'page':165 'paramet':176 'part':41,201 'path':184 'pay':51 'pay-per-cal':50 'pay-per-call NFT data' 'pay-per-request' 'payment':100,113,118 'per':12,25,52,79 'per-request':78 'place':145 'platform':73 'post':95 'price':81,170 'proof':119 'proper':220 'protocol':49,106 'provid':172 'pure':157 'queri':1,14 'rate':150 'request':13,26,80,96 'request/response':174 'return':31,98,218 'schema':175 'servic':68 'settl':83 'share':74 'span':60 'specif':91,189 'suggest':197 'suit':45 'surfac':207 'token ownership query' 'uniform':76 'unit':130 'usag':179 'usdc':85,132,141 'usdc-payment' 'util':67 'valid':117 'via':5,18,103 'x':112 'x-payment':111 'x402':6,19,48,105,121 'x402 NFT endpoint' 'x402-micropayment' 'x402-protocol':47","prices":[{"id":"465cc3ef-5956-4d96-a251-898b56ef536d","listingId":"c406c202-ddda-4eef-99ab-8ea505f09220","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/15/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":"2026-04-21T18:32:27.406Z"}],"sources":[{"listingId":"c406c202-ddda-4eef-99ab-8ea505f09220","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/15/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.406Z","lastSeenAt":"2026-04-22T23:02:49.109Z"}],"details":{"listingId":"c406c202-ddda-4eef-99ab-8ea505f09220","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/15/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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","source_url":"https://lowpaymentfee.com/api/v1/nfts/15/owner"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/15/owner"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Looking up the current owner of a specific NFT programmatically","Verifying NFT ownership as part of a gating or access-control workflow","Building dashboards or analytics that track NFT ownership changes"],"bestFor":["Agents or apps that need on-demand NFT ownership data without managing API keys","Micropayment-native workflows where per-call billing is preferred","Developers already operating on the Base L2 network with USDC"],"notFor":["Bulk or batch NFT ownership queries across thousands of tokens (no documented batch endpoint)","Users who need detailed NFT metadata beyond ownership (traits, images, history)","Callers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.463Z"},"updatedAt":"2026-04-22T23:02:49.109Z"}}