{"id":"0088eb6d-b47d-49cd-8a06-10a9d0d0c8af","shortId":"E7YdvE","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 #45 via a pay-per-call x402 protocol. The endpoint accepts POST requests and settles payments 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 or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider hosts a broader suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced at $0.02 per request on the same x402 payment model. However, this specific listing covers only the `/api/v1/nfts/45/owner` endpoint, which appears to return NFT ownership information.\n\nDocumentation is minimal — the provider's site lists endpoints with short labels and prices but does not publish OpenAPI schemas, request/response examples, or detailed field descriptions. The endpoint is confirmed live (HTTP 402 challenge returned), but the actual response payload structure is unknown beyond the declared mimeType of application/json.","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","token holder query","ERC-721 owner","NFT metadata","on-chain NFT data","x402 NFT endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Endpoint is hardcoded to NFT #45; it is unclear whether other NFT IDs are queryable at different paths.","Provider site pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.","The broader API suite listed on the homepage could not be verified beyond their listing cards."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/45/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/45/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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request body format, no response examples, and the endpoint is narrowly scoped to a single NFT ID with no explanation of what data is returned. Documentation is effectively 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'0.02':11,24,76,138 '000':67 '20':66 '402':195 '45':36 '6':72 'ERC-721 owner' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'actual':200 'advertis':62 'ai/ml':112 'analysi':115 'analyt':111 'api':80,108 'appear':157 'application/json':211 'attach':89 'base':9,22,57,68 'base-network' 'beyond':206 'broader':105 'call':42 'caller':87 'challeng':61,196 'classif':117 'confirm':192 'convers':133 'cover':151 'data':4,17,110 'decim':73 'declar':208 'descript':188 'detail':186 'document':163 'embed':118 'endpoint':28,46,155,171,190 'equal':75 'estim':127 'exampl':184 'exchang':122 'feed':121 'field':187 'finance/web3':119 'gas':126 'generat':134 'geocod':131 'header':94 'host':103 'howev':147 'http':194 'infer':113 'inform':162 'infrastructur':129 'key':81 'label':174 'limit':84 'list':150,170 'live':193 'lowpaymentfee.com':30 'maxamountrequir':64 'micropay':7,20 'mimetyp':209 'minim':165 'model':146 'network':58 'nft':2,15,35,160 'nft-ownership-lookup' 'no-api-key' 'on-chain NFT data' 'openapi':181 'owner':33 'ownership':3,16,161 'pay':40 'pay-per-cal':39 'pay-per-request' 'payload':202 'payment':52,93,99,145 'per':12,25,41,77,139 'post':48 'price':120,136,176 'proof':100 'protocol':44 'provid':102,167 'publish':180 'queri':1,14 'quot':125 'rate':83,123 'request':13,26,49,78,140 'request/response':183 'requir':86 'respons':201 'return':31,159,197 'schema':182 'sentiment':114 'settl':51 'short':173 'simpli':88 'site':169 'span':109 'specif':149 'structur':203 'suit':106 'summar':116 'token':124 'token holder query' 'unit':69 'unknown':205 'usdc':54,71 'usdc-settlement' 'util':130 'valid':97,132 'via':5,18,37 'x':92 'x-payment':91 'x402':6,19,43,60,98,144 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"940becdb-46c3-452e-b12d-2663ad77db7c","listingId":"0088eb6d-b47d-49cd-8a06-10a9d0d0c8af","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/45/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":"2026-04-21T18:32:33.033Z"}],"sources":[{"listingId":"0088eb6d-b47d-49cd-8a06-10a9d0d0c8af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/45/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.033Z","lastSeenAt":"2026-04-22T04:02:47.590Z"}],"details":{"listingId":"0088eb6d-b47d-49cd-8a06-10a9d0d0c8af","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/45/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 of USDC (USD Coin) on the Base network.","source_url":"https://lowpaymentfee.com/api/v1/nfts/45/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":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/45/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Verifying NFT ownership as part of a token-gating workflow","Building dashboards that display NFT holder information","Agent-driven NFT portfolio analysis"],"bestFor":["Developers needing simple pay-per-call NFT ownership queries without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic NFT data lookups where $0.02/call is cost-effective"],"notFor":["Bulk or high-throughput NFT indexing (no batch endpoint documented)","Querying arbitrary NFT IDs (this endpoint is scoped to NFT #45 specifically)","Users who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:49.934Z"},"updatedAt":"2026-04-22T04:02:47.590Z"}}