{"id":"b21c887d-5805-46e4-a7d2-b7af44adea73","shortId":"QFHXdt","kind":"x402","title":"Look up NFT ownership data via x402 micropayment on Base for $0.02 per request.","tagline":"Look up NFT ownership data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns NFT owner information for a specific NFT (ID 78) via an x402-gated POST request. Payment is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider (lowpaymentfee.com) hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. This particular endpoint sits under the NFT category and is discoverable via HTTP POST. The response MIME type is application/json. No OpenAPI schema or detailed documentation beyond the landing page was found, so the exact request body format and response fields are unknown.\n\nThe endpoint is live: the probe received a proper HTTP 402 with a well-formed x402 challenge. Payment is directed to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base. The timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["nft-ownership-lookup","x402-payment","usdc-base","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","NFT holder query","on-chain NFT data"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Request body format and response fields are unknown — no examples found","This specific NFT endpoint (/api/v1/nfts/78/owner) is not listed on the provider's landing page; only generic API categories are shown","Crawled /api, /pricing, and /README pages returned no useful content (wallet-connect gate)"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/78/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/78/owner","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live with a valid x402 402 challenge and clear pricing. However, there is no OpenAPI schema, no documented request/response format, and the crawled pages beyond the landing page were empty (wallet-connect gates). The specific NFT endpoint is not even listed on the provider's homepage, making its purpose and response shape entirely 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'000':67 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':196 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':200 '20':66 '300':209 '402':183 '6':72 '78':42 'Base USDC micropayment API' 'NFT holder query' 'NFT owner lookup' 'NFT ownership API' 'advertis':62 'ai/ml':117 'analyt':116 'api':80,113 'application/json':149 'attach':89 'base':10,24,57,68,202 'beyond':156 'bodi':166 'broader':106 'call':78,112 'caller':87 'categori':137 'challeng':61,190 'contract':199 'data':5,19,115,120 'decim':73 'detail':154 'direct':193 'discover':140 'document':155 'endpoint':30,132,174 'equal':75 'exact':164 'field':170 'finance/web3':119 'form':188 'format':167 'found':161 'gate':47 'header':94 'host':104 'http':142,182 'id':41 'infer':118 'inform':36 'json-response' 'key':81 'land':158 'limit':84 'live':176 'look':1,15 'lowpaymentfee.com':32,103 'maxamountrequir':64 'micropay':8,22 'mime':146 'network':58 'nft':3,17,34,40,136 'nft-ownership-lookup' 'no-api-key' 'on-chain NFT data' 'openapi':151 'owner':35 'ownership':4,18 'page':159 'particular':131 'pay':110 'pay-per-cal':109 'pay-per-request' 'payment':50,93,99,191,206 'per':13,27,77,111,128 'post':48,143 'price':125 'probe':178 'proof':100 'proper':181 'provid':102 'rate':83 'receiv':179 'request':14,28,49,129,165 'requir':86 'respons':145,169 'return':33 'schema':152 'second':210 'servic':123 'settl':52 'settlement':207 'simpli':88 'sit':133 'span':114 'specif':39 'suit':107 'timeout':204 'type':147 'unit':69 'unknown':172 'usdc':54,71,198 'usdc-base' 'use':197 'util':122 'valid':97 'via':6,20,43,141 'wallet':195 'well':187 'well-form':186 'x':92 'x-payment':91 'x402':7,21,46,60,98,189 'x402 NFT endpoint' 'x402-gated':45 'x402-payment'","prices":[{"id":"3dbcd7de-416f-423b-8996-f383d8e0c4c3","listingId":"b21c887d-5805-46e4-a7d2-b7af44adea73","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/78/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":"2026-04-21T18:32:28.611Z"}],"sources":[{"listingId":"b21c887d-5805-46e4-a7d2-b7af44adea73","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/78/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.611Z","lastSeenAt":"2026-04-22T13:32:33.858Z"}],"details":{"listingId":"b21c887d-5805-46e4-a7d2-b7af44adea73","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/78/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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/78/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/78/owner"},{"claim":"All APIs 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":"Payment timeout is 300 seconds","source_url":"https://lowpaymentfee.com/api/v1/nfts/78/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building Web3 dashboards that verify NFT holders on demand"],"bestFor":["Agents needing quick NFT ownership lookups with crypto micropayments","Developers who want keyless, pay-per-call NFT data access","Workflows that already settle payments in USDC on Base"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-ID endpoint)","Users who need free or fiat-only payment options","Querying NFTs on networks other than what this provider supports"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.421Z"},"updatedAt":"2026-04-22T13:32:33.858Z"}}