{"id":"d4e32a71-4ca9-40a0-9474-43cf34585435","shortId":"EpCkFa","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 #62 via a pay-per-call x402 protocol. The payment is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint accepts POST requests and returns JSON. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request. However, this specific endpoint is scoped to NFT owner lookups.\n\nDocumentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled pages beyond the landing page returned only wallet-connect prompts. The endpoint is confirmed live (402 challenge returned successfully), but the exact request body format and response structure are not documented in the available material.","tags":[],"capabilities":["nft-owner-lookup","x402-micropayment","usdc-payment","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT ownership","NFT owner query","token holder lookup","ERC-721 owner","NFT metadata","on-chain NFT data","x402 NFT API"],"warnings":["No OpenAPI or request/response schema available — request body format and response structure are unknown.","Endpoint path is hardcoded to NFT #62; it is unclear whether other NFT IDs are supported via parameterized paths.","Documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content.","The broader platform advertises many API categories but none of the other endpoints were probed or verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/62/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/62/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, but there is no OpenAPI spec, no documented request/response schema, and no examples. The crawled docs pages returned only wallet-connect stubs. The endpoint's purpose (NFT owner lookup) is inferred from the URL path 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'000':63 '20':62 '402':187 '6':69 '62':36 'ERC-721 owner' 'NFT metadata' 'NFT owner query' 'NFT ownership' 'accept':100 'across':123 'advertis':58 'ai/ml':128 'analyt':127 'api':77,122 'attach':86 'avail':205 'base':9,22,53,64 'base-network' 'beyond':161,172 'bodi':195 'broader':111 'call':42,121 'caller':84 'categori':124 'challeng':57,164,188 'confirm':185 'connect':180 'crawl':170 'data':4,17,126 'decim':70 'document':150,202 'dozen':116 'endpoint':28,99,143,183 'equal':72 'exact':193 'finance/web3':130 'format':196 'header':91 'howev':140 'includ':125 'infer':129 'infrastructur':132 'json':105 'key':78 'land':174 'limit':81 'live':186 'lookup':149 'lowpaymentfee.com':30,113 'materi':206 'maxamountrequir':60 'micropay':7,20 'minim':152 'network':54 'nft':2,15,35,147 'nft-owner-lookup' 'no-api-key' 'offer':115 'on-chain NFT data' 'openapi':156 'outputschema':166 'owner':33,148 'ownership':3,16 'page':171,175 'part':108 'pay':40,119 'pay-per-cal':39,118 'pay-per-call' 'payment':46,90,96 'per':12,25,41,74,120,138 'platform':112 'post':101 'price':135 'prompt':181 'proof':97 'protocol':44 'queri':1,14 'rate':80 'request':13,26,75,102,139,194 'request/response':159 'requir':83 'respons':198 'return':31,104,176,189 'schema':160 'scope':145 'settl':48 'simpli':85 'sinc':66 'spec':157 'specif':142 'structur':199 'stub':167 'success':190 'token holder lookup' 'unit':65 'usdc':50,67 'usdc-payment' 'use':68 'util':133 'valid':94 'via':5,18,37 'wallet':179 'wallet-connect':178 'x':89 'x-payment':88 'x402':6,19,43,56,95,163 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"55686862-39d6-4f85-b11a-b1da0c189c02","listingId":"d4e32a71-4ca9-40a0-9474-43cf34585435","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/62/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":"2026-04-21T18:32:28.552Z"}],"sources":[{"listingId":"d4e32a71-4ca9-40a0-9474-43cf34585435","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/62/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.552Z","lastSeenAt":"2026-04-22T13:32:33.813Z"}],"details":{"listingId":"d4e32a71-4ca9-40a0-9474-43cf34585435","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/62/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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/62/owner"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base (6 decimals), so 20000 base units = $0.02.","source_url":"https://lowpaymentfee.com/api/v1/nfts/62/owner"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Look up the current owner of a specific NFT programmatically","Verify NFT ownership as part of a gating or access-control workflow","Integrate NFT owner data into dashboards or analytics pipelines"],"bestFor":["Agents or apps needing on-demand NFT ownership checks without managing API keys","Developers who want to pay per call in USDC on Base without subscriptions","Automated workflows that need low-cost, low-friction NFT data access"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-NFT endpoint, no batch support documented)","Users who need detailed NFT metadata beyond ownership (traits, images, history)","Applications requiring free or fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.546Z"},"updatedAt":"2026-04-22T13:32:33.813Z"}}