{"id":"92ac7215-aeaf-42e1-b9e1-166304fb7e90","shortId":"zfFMga","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 #66 via a pay-per-call x402 protocol. The endpoint accepts POST requests and 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 request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and settle on the Base network using USDC.\n\nThis specific endpoint (/api/v1/nfts/66/owner) appears to be an NFT ownership lookup. The response format is application/json. No detailed schema for the response body or request body is documented, so the exact fields returned are unknown. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","pay-per-request NFT data","lowpaymentfee NFT"],"warnings":["No request or response schema documented — callers must discover the expected POST body by experimentation.","Endpoint is hardcoded to NFT #66; unclear if other token IDs are available at similar paths.","No OpenAPI spec, README, or detailed API documentation was found on the site.","The broader platform lists many API categories (AI, finance, analytics, etc.) but none were probed; their actual functionality is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/66/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/66/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 402 challenge, but there is no OpenAPI schema, no documented request/response body, and no examples. The endpoint is narrowly scoped to a single NFT (token 66). The crawled pages beyond the homepage returned only 'Connect wallet' with no additional 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'0.02':11,24,76,149 '000':67 '20':66 '402':203 '6':72 '66':36 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'advertis':62 'ai/ml':117 'analysi':120 'analyt':116 'api':80,113 'appear':164 'application/json':175 'attach':90 'base':9,22,57,68,156 'base-network' 'bodi':182,185 'broader':103 'call':42 'caller':88 'challeng':61,204 'classif':122 'convers':141 'data':4,17,115,127 'decim':73 'detail':177 'document':187 'embed':123 'endpoint':28,46,144,162,196 'equal':75 'estim':135 'exact':190 'exchang':130 'feed':129 'field':191 'financ':124 'format':173 'gas':134 'gate':112 'generat':142 'geocod':139 'header':95 'infer':118 'infrastructur':137 'json-response' 'key':81 'limit':83 'live':198 'lookup':170 'lowpaymentfee NFT' 'lowpaymentfee.com':30,104 'maxamountrequir':64 'micropay':7,20 'network':58,157 'nft':2,15,35,168 'nft-ownership-lookup' 'no-api-key' 'offer':106 'owner':33 'ownership':3,16,169 'pay':40 'pay-per-cal':39 'pay-per-call' 'pay-per-request NFT data' 'payment':94,100 'per':12,25,41,77,150 'platform':105 'post':48 'price':128,147 'proof':101 'proper':202 'protocol':44 'queri':1,14 'quot':133 'rate':82,131 'request':13,26,49,78,151,184 'requir':87 'respons':172,181 'return':31,192,200 'schema':178 'sentiment':119 'settl':52,153 'simpli':89 'span':114 'specif':161 'subscript':85 'suit':108 'summar':121 'token':132 'uniform':146 'unit':69 'unknown':194 'usdc':54,71,159 'usdc-settlement' 'use':158 'util':138 'valid':98,140 'via':5,18,37 'web3':126 'x':93 'x-payment':92 'x402':6,19,43,60,99,111 'x402 NFT endpoint' 'x402-gated':110 'x402-micropayment'","prices":[{"id":"0ec0b06a-9867-4bfa-b337-5b10ec587b81","listingId":"92ac7215-aeaf-42e1-b9e1-166304fb7e90","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/66/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":"2026-04-21T18:32:32.684Z"}],"sources":[{"listingId":"92ac7215-aeaf-42e1-b9e1-166304fb7e90","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/66/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.684Z","lastSeenAt":"2026-04-22T07:02:17.582Z"}],"details":{"listingId":"92ac7215-aeaf-42e1-b9e1-166304fb7e90","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/66/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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/66/owner"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/66/owner"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"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","Agent-driven NFT portfolio analysis"],"bestFor":["Developers needing simple pay-per-call NFT ownership data without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic NFT data lookups where subscription pricing is wasteful"],"notFor":["Bulk or high-throughput NFT indexing across many collections (no batch endpoint documented)","Users who cannot settle USDC payments on the Base network","Querying NFTs other than token ID 66 (this endpoint is scoped to a single NFT)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.622Z"},"updatedAt":"2026-04-22T07:02:17.582Z"}}