{"id":"860be923-9a9f-4108-85a1-10b8bd88d412","shortId":"CUd2YC","kind":"x402","title":"NFT ownership lookup via x402 micropayment on Base, $0.02 per request in USDC.","tagline":"NFT ownership lookup via x402 micropayment on Base, $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (ID 60) via a POST request. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/nfts/60/owner` costs $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The provider advertises no rate limits and instant access. The response MIME type is application/json.\n\nThe endpoint is live and returns a proper 402 challenge with x402 version 1. However, there is no OpenAPI schema, no request/response body documentation, and no examples available from the crawled pages. The exact structure of the POST body (if any input is needed beyond the URL path) and the response payload are unknown. The broader platform lists many endpoint categories but provides no detailed documentation for any of them.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","who owns NFT","token holder query","ERC-721 owner","NFT metadata","on-chain NFT data"],"warnings":["No request or response schema documented — callers must guess the POST body format","Endpoint path is hard-coded to NFT ID 60; unclear if other IDs are available at different URLs","No OpenAPI spec, no README content, and no detailed docs found on the provider site","The broader platform lists many API categories but none appear documented beyond titles and prices"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/60/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/60/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 challenge, but there is no OpenAPI schema, no request/response documentation, and no examples. The endpoint path is hard-coded to a single NFT ID (60), and the provider's crawled pages contain no detail beyond a pricing table. Effectively a stub 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'0.02':9,22,95 '000':99 '1':156 '20':98 '402':151 '6':105 '60':40 'ERC-721 owner' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'access':136 'account':111 'advertis':130 'ai/ml':66 'analyt':65 'api':57,108 'application/json':142 'attach':116 'avail':170 'base':8,21,88,100 'base-network' 'beyond':187 'bodi':165,181 'broader':50,198 'call':56 'caller':114 'categori':203 'challeng':152 'cost':94 'crawl':173 'data':64,69 'decim':106 'detail':207 'document':166,208 'endpoint':28,74,92,144,202 'exact':176 'exampl':169 'finance/web3':68 'header':121 'howev':157 'id':39 'infer':67 'inform':34 'input':184 'instant':135 'key':109 'limit':133 'list':200 'live':146 'lookup':3,16 'lowpaymentfee.com':30 'mani':201 'micropay':6,19 'mime':139 'need':186 'network':89 'nft':1,14,32,38 'nft-ownership-lookup' 'no-api-key' 'offer':58 'on-chain NFT data' 'openapi':161 'ownership':2,15,33 'page':174 'part':47 'path':190 'pay':54 'pay-per-cal':53 'pay-per-request' 'payload':194 'payment':81,120,126 'per':10,23,55,96 'platform':77,199 'post':43,180 'proof':127 'proper':150 'protocol':82 'provid':62,129,205 'rate':132 'request':11,24,44,97 'request/response':164 'requir':113 'respons':138,193 'return':31,148 'schema':162 'servic':72 'settl':83 'simpli':115 'span':63 'specif':37,91 'structur':177 'suit':51 'token holder query' 'type':140 'unit':101 'unknown':196 'url':189 'usdc':13,26,85,103 'usdc-settlement' 'use':78 'util':71 'valid':124 'version':155 'via':4,17,41 'who owns NFT' 'x':119 'x-payment':118 'x402':5,18,80,125,154 'x402-micropayment'","prices":[{"id":"dc75de9c-e7c6-4a04-b153-d06040ae9744","listingId":"860be923-9a9f-4108-85a1-10b8bd88d412","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/60/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":"2026-04-21T18:32:28.479Z"}],"sources":[{"listingId":"860be923-9a9f-4108-85a1-10b8bd88d412","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/60/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.479Z","lastSeenAt":"2026-04-22T15:03:11.966Z"}],"details":{"listingId":"860be923-9a9f-4108-85a1-10b8bd88d412","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/60/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 x402 version 1, accepting USDC on Base network at 20,000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/60/owner"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/60/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Verifying NFT ownership as part of a gating or access-control workflow","Building dashboards that display NFT holder information"],"bestFor":["Agents or apps that need quick NFT ownership checks without managing API keys","Micropayment-friendly workflows where per-call billing is preferred","Developers already operating on the Base network with USDC"],"notFor":["Bulk or batch NFT ownership queries across many token IDs (only one NFT ID is exposed at this URL)","Users who need detailed NFT metadata beyond ownership","Anyone without USDC on Base to pay the x402 challenge"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.676Z"},"updatedAt":"2026-04-22T15:03:11.966Z"}}