{"id":"c75fc896-d8c6-487f-bb08-53183e5f2008","shortId":"tAYS9z","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 owner information for a specific NFT (ID 3) 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 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 across several categories including 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 appear to share the same $0.02-per-request pricing model on the Base network using USDC.\n\nDocumentation is minimal. The landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The specific NFT owner endpoint's behavior (expected POST body, response format) must be inferred from the endpoint path and the x402 challenge metadata alone. The response MIME type is application/json.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","lowpaymentfee NFT","pay-per-call NFT data","on-chain NFT owner"],"warnings":["No OpenAPI schema or endpoint documentation available","Request body format and response schema are unknown — no examples provided by the provider","The specific endpoint is for NFT ID 3 only; unclear if other NFT IDs are supported via similar paths","Landing page shows many API categories but none have detailed docs; the broader platform's maturity is uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/3/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/3/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on request parameters, response schema, or usage examples. The endpoint path suggests NFT owner lookup but the actual behavior is unverified. Effectively a stub 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'000':71 '20':70 '3':40 '6':76 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':51 'across':113 'advertis':66 'ai/ml':119 'alon':209 'analysi':122 'analyt':118 'api':84,112 'appear':147 'application/json':215 'attach':93 'avail':171 'base':9,22,61,72,160 'base-network' 'behavior':191 'bodi':194 'broader':109 'call':46 'caller':91 'categori':115 'challeng':65,207 'classif':124 'convers':143 'data':4,17,117,129 'decim':77 'descript':181 'document':164 'embed':125 'endpoint':28,50,146,172,189,202 'equal':79 'estim':137 'exampl':184 'exchang':132 'expect':192 'feed':131 'financ':126 'format':196 'gas':136 'generat':144 'geocod':141 'header':98 'host':107 'id':39 'includ':116 'infer':120,199 'inform':34 'infrastructur':139 'json-response' 'key':85 'land':168 'limit':88 'list':170 'lowpaymentfee NFT' 'lowpaymentfee.com':30 'maxamountrequir':68 'metadata':208 'micropay':7,20 'mime':212 'minim':166 'model':157 'must':197 'network':62,161 'nft':2,15,32,38,187 'nft-ownership-lookup' 'no-api-key' 'on-chain NFT owner' 'owner':33,188 'ownership':3,16 'page':169 'paramet':180 'path':203 'pay':44 'pay-per-cal':43 'pay-per-call NFT data' 'pay-per-request' 'payment':97,103 'per':12,25,45,81,154 'per-request':153 'post':52,193 'price':130,156,174 'proof':104 'protocol':48 'provid':106,176 'queri':1,14 'quot':135 'rate':87,133 'request':13,26,53,82,155 'request/response':178 'requir':90 'respons':195,211 'return':31 'schema':179 'sentiment':121 'settl':56 'sever':114 'share':149 'simpli':92 'specif':37,186 'suit':110 'summar':123 'token':134 'type':213 'unit':73 'usag':183 'usdc':58,75,163 'usdc-payment' 'use':162 'util':140 'valid':101,142 'via':5,18,41 'web3':128 'x':96 'x-payment':95 'x402':6,19,47,64,102,206 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"55ff3cd6-aff0-4b7a-8126-788e8ef679a9","listingId":"c75fc896-d8c6-487f-bb08-53183e5f2008","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/3/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":"2026-04-21T18:32:27.801Z"}],"sources":[{"listingId":"c75fc896-d8c6-487f-bb08-53183e5f2008","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/3/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.801Z","lastSeenAt":"2026-04-22T20:02:12.989Z"}],"details":{"listingId":"c75fc896-d8c6-487f-bb08-53183e5f2008","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/3/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/3/owner"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/3/owner"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Building Web3 dashboards that verify NFT holders via micropayment-gated endpoints"],"bestFor":["Agents needing quick NFT ownership lookups without subscription overhead","Developers prototyping x402-based micropayment integrations","Low-volume, on-demand NFT data queries"],"notFor":["Bulk or batch NFT ownership queries across large collections","Applications requiring detailed NFT metadata beyond ownership","Users who need free or subscription-based access without per-call payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.821Z"},"updatedAt":"2026-04-22T20:02:12.989Z"}}