{"id":"8ac39282-2d3f-4993-9b43-dc6fb5d7e4aa","shortId":"zHkGUx","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 #53. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/53/owner` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the `exact` scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nThe platform lists many other endpoints at the same $0.02 price point covering sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more. However, no OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl. The exact response format for the NFT owner endpoint is undocumented beyond the stated mimeType of application/json.","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 OpenAPI or request/response schema available — request body and response format are unknown.","This endpoint is hardcoded to NFT #53; it is unclear whether other NFT IDs are supported at different paths.","No documentation pages rendered meaningful content (pricing, README, and /api pages only showed 'Connect wallet').","The platform lists many diverse API categories but no evidence of actual backend functionality was found beyond the x402 gate."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/53/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/53/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). However, there is no OpenAPI schema, no documented request body format, no example responses, and no detailed documentation for this specific NFT endpoint. The listing is essentially a stub with a working payment 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'0.02':11,24,103,154 '000':92 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':118 '0x8335':97 '20':91 '2913':98 '300':121 '53':37 '6':107 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':75 'access':132 'across':51 'address':117 'advertis':131 'ai/ml':54 'amount':88 'analysi':159 'analyt':53 'api':50,125 'application/json':201 'base':9,22,67,93,100 'base-network' 'behind':81 'beyond':196 'broader':43 'categori':58 'challeng':85 'cover':157 'crawl':184 'data':4,17,52 'decim':108 'detail':174 'document':176 'embed':162 'endpoint':28,73,150,193 'equal':102 'estim':166 'exact':114,186 'exampl':179 'feed':164 'finance/web3':55 'format':188 'found':181 'gas':165 'gate':80 'geocod':167 'header':144 'howev':170 'includ':138 'inform':34 'infrastructur':57 'instant':134 'key':126 'limit':129 'list':147 'lowpaymentfee.com':30 'made':111 'mani':148 'maximum':87 'micropay':7,20 'mimetyp':199 'network':68 'nft':2,15,32,36,191 'nft-ownership-lookup' 'no-api-key' 'offer':45 'openapi':172 'owner':192 'ownership':3,16,33 'part':40 'pay':47 'pay-per-request':46 'payment':84,109,136,143 'per':12,25,48 'platform':44,146 'point':156 'post':76 'price':155,163 'protocol':64 'queri':1,14 'rate':128 'request':13,26,49,77 'request/response':175 'requir':89 'respons':187 'return':31 'schema':173 'scheme':115 'second':122 'sentiment':158 'settl':60 'specif':72 'state':198 'summar':161 'text':160 'timeout':123 'token holder query' 'undocu':195 'unit':94 'usag':178 'usd':104 'usdc':70,96,105 'usdc-payment' 'use':69,106 'via':5,18,61,112 'who owns NFT' 'x':142 'x-payment':141 'x402':6,19,63,83 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"cb3510f7-ec9c-4d21-82a8-a37780995cc9","listingId":"8ac39282-2d3f-4993-9b43-dc6fb5d7e4aa","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/53/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":"2026-04-21T18:32:28.410Z"}],"sources":[{"listingId":"8ac39282-2d3f-4993-9b43-dc6fb5d7e4aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/53/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.410Z","lastSeenAt":"2026-04-22T15:03:11.853Z"}],"details":{"listingId":"8ac39282-2d3f-4993-9b43-dc6fb5d7e4aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/53/owner \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 HTTP 402 with an x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/53/owner"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/53/owner"},{"claim":"All APIs 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":"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","Integrating NFT ownership checks into agent workflows without API key management","Verifying NFT provenance or holder status in automated pipelines"],"bestFor":["Agents needing on-demand NFT ownership data with no signup","Developers prototyping x402 payment flows on Base","Low-volume, pay-as-you-go NFT data queries"],"notFor":["Bulk or batch NFT ownership lookups across many token IDs (only NFT #53 is exposed at this path)","Users who need free or subscription-based access rather than per-request crypto payments","Querying NFTs on networks other than Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.818Z"},"updatedAt":"2026-04-22T15:03:11.853Z"}}