{"id":"0537adad-5f7e-4999-bcdb-cf4385f8c6b6","shortId":"3QZpnM","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 a specific NFT (ID 67) via a POST request. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories, all settled through the x402 protocol on the Base network using USDC.\n\nThe endpoint charges 0.02 USDC per request (maxAmountRequired of 20,000 base units with 6 decimals for USDC). Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required. The x402 challenge was confirmed live, returning a proper 402 Payment Required response with version 1 of the protocol. The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, and payments are directed to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is minimal — the site's landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or example payloads for this specific NFT owner endpoint. The response MIME type is application/json, but the structure of the returned data is not documented.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","lowpaymentfee NFT"],"warnings":["No request or response schema documented — the structure of the returned JSON is unknown.","Only a single NFT ID (67) is exposed at this URL; it is unclear whether other NFT IDs are available at similar paths.","The landing page lists many API categories but provides no detailed docs for any of them.","No OpenAPI spec, README, or API reference was found during crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/67/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/67/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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation on request parameters, response schema, or example payloads for this specific NFT owner endpoint, making it effectively a stub 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'000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':141 '1':130 '20':87 '300':150 '402':124 '6':92 '67':40 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'account':109 'across':58 'ai/ml':61 'analyt':60 'api':57,107 'application/json':187 'asset':136 'avail':162 'base':9,22,74,89,139 'base-network' 'broader':50 'call':56 'categori':65 'challeng':117 'charg':80 'confirm':119 'contract':137 'data':4,17,59,194 'decim':93 'descript':172 'direct':145 'document':153,197 'endpoint':28,79,163,181 'exampl':174 'finance/web3':62 'header':105 'id':39 'inform':34 'infrastructur':64 'inlin':99 'key':108 'land':159 'limit':112 'list':161 'live':120 'lowpaymentfee NFT' 'lowpaymentfee.com':30 'made':98 'maxamountrequir':85 'micropay':7,20 'mime':184 'minim':155 'network':75 'nft':2,15,32,38,179 'nft-ownership-query' 'no-api-key' 'offer':52 'on-chain NFT data' 'owner':180 'ownership':3,16,33 'page':160 'paramet':171 'part':47 'pay':54 'pay-per-cal':53 'pay-per-request' 'payload':175 'payment':96,104,125,143 'per':12,25,55,83 'platform':51 'post':43 'price':165 'proper':123 'protocol':71,133 'provid':167 'queri':1,14 'rate':111 'request':13,26,44,84 'request/response':169 'requir':114,126 'respons':127,183 'return':31,121,193 'schema':170 'second':151 'settl':67 'site':157 'specif':37,178 'structur':190 'timeout':152 'type':185 'unit':90 'usdc':77,82,95,135 'usdc-settlement' 'use':76 'version':129 'via':5,18,41,100 'x':103 'x-payment':102 'x402':6,19,70,116 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"2dee9687-0580-4993-8149-7177085f4f64","listingId":"0537adad-5f7e-4999-bcdb-cf4385f8c6b6","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/67/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":"2026-04-21T18:32:28.666Z"}],"sources":[{"listingId":"0537adad-5f7e-4999-bcdb-cf4385f8c6b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/67/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.666Z","lastSeenAt":"2026-04-22T13:32:33.958Z"}],"details":{"listingId":"0537adad-5f7e-4999-bcdb-cf4385f8c6b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/67/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 a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/67/owner"},{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/67/owner"}],"useCases":["Looking up the current owner of a specific NFT","Verifying NFT ownership for gating or access control","Integrating NFT ownership checks into automated agent workflows"],"bestFor":["Agents needing quick NFT ownership lookups without API key registration","Developers prototyping NFT-aware applications with instant pay-per-call access","Workflows requiring on-demand NFT data with crypto-native payment"],"notFor":["Bulk or batch NFT ownership queries across many token IDs (only one NFT ID is exposed at this endpoint)","Users who cannot pay with USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.366Z"},"updatedAt":"2026-04-22T13:32:33.958Z"}}