{"id":"a2e34384-691e-49de-84a2-500d492aa55d","shortId":"2LggPv","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 the owner of NFT #85 via a pay-per-call x402 protocol. The payment is settled on the Base network using USDC (contract 0x8335…2913). Each request costs 20,000 base units of USDC, which at 6 decimals equals $0.02. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. This specific route (`/api/v1/nfts/85/owner`) is an NFT ownership lookup. The POST method is used, and the response MIME type is application/json.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect stub with no additional detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response structure after successful payment is unknown.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key","no-rate-limit"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","token owner query","lowpaymentfee NFT"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","Documentation pages (/api, /pricing, /README) return only a wallet-connect stub with no content","This path is hardcoded to NFT #85; it is unclear whether other NFT IDs are queryable via similar routes","The platform description ('Premium API Access') is generic and does not describe this specific endpoint's functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/85/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/85/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no example payloads, and the documentation pages are empty wallet-connect stubs. The actual behavior after payment is entirely 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'/api/v1/nfts/85/owner':131 '/pricing':158 '/readme':160 '0.02':11,24,72,125 '000':62 '0x8335':56 '20':61 '2913':57 '402':195 '6':69 '85':36 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'actual':199 'addit':172 'ai/ml':115 'analyt':114 'api':74,111 'application/json':148 'attach':83 'avail':186 'base':9,22,51,63 'base-network' 'beyond':150 'broader':101 'call':42 'caller':81 'challeng':196 'confirm':190 'connect':168 'contract':55 'cost':60 'data':4,17,113,118 'decim':70 'detail':173 'document':149 'dozen':106 'endpoint':28,96,188 'equal':71 'exampl':184 'finance/web3':117 'gate':110 'header':88 'infer':116 'key':75 'land':152 'limit':78 'live':191 'lookup':136 'lowpaymentfee NFT' 'lowpaymentfee.com':30,103 'method':139 'micropay':7,20 'mime':145 'network':52 'nft':2,15,35,134 'nft-ownership-lookup' 'no-api-key' 'no-rate-limit' 'offer':105 'on-chain NFT data' 'openapi':177 'owner':33 'ownership':3,16,135 'page':153,161 'part':98 'pay':40 'pay-per-cal':39 'pay-per-request' 'payload':185 'payment':46,87,93,204 'per':12,25,41,126 'platform':102 'post':138 'price':123 'proof':94 'proper':194 'protocol':44 'queri':1,14 'rate':77 'request':13,26,59,127 'request/response':180 'requir':80 'resolv':163 'respons':144,200 'return':31,192 'rout':130 'schema':181 'servic':121 'settl':48 'simpli':82 'span':112 'spars':155 'spec':178 'specif':129 'structur':201 'stub':169 'success':203 'token owner query' 'type':146 'unit':64 'unknown':206 'usdc':54,66 'usdc-payment' 'use':53,141 'util':120 'valid':91 'via':5,18,37 'wallet':167 'wallet-connect':166 'x':86 'x-payment':85 'x402':6,19,43,92,109 'x402 NFT endpoint' 'x402-gated':108 'x402-micropayment'","prices":[{"id":"da844aba-263a-4764-9998-f401ac84ea30","listingId":"a2e34384-691e-49de-84a2-500d492aa55d","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/85/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":"2026-04-21T18:32:32.336Z"}],"sources":[{"listingId":"a2e34384-691e-49de-84a2-500d492aa55d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/85/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.336Z","lastSeenAt":"2026-04-22T08:32:26.337Z"}],"details":{"listingId":"a2e34384-691e-49de-84a2-500d492aa55d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/85/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 x402Version 1, accepting USDC on Base network at 20,000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/85/owner"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/85/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building dashboards or bots that verify NFT holders via micropayment-gated calls"],"bestFor":["Agents needing quick, keyless NFT ownership lookups","Developers prototyping x402 payment flows on Base","Low-volume, pay-as-you-go NFT data queries"],"notFor":["Bulk or batch NFT ownership queries across many token IDs (only NFT #85 is exposed at this path)","Users who need detailed NFT metadata beyond ownership","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.14Z"},"updatedAt":"2026-04-22T08:32:26.337Z"}}