{"id":"4cb92fa6-4827-4795-be89-3bc3b2a22d3a","shortId":"Ydtvyz","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 #81 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 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 endpoints are uniformly priced at $0.02 per request and settle on the Base network using USDC. This specific endpoint (/api/v1/nfts/81/owner) falls under the Web3/NFT category and returns JSON describing the current owner of the specified NFT.\n\nNote that no OpenAPI schema, detailed documentation, or example responses were found in the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the exact response format and the NFT collection context are unknown. The provider's landing page confirms the pricing model and general architecture but does not document individual endpoint schemas.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","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","on-chain NFT data","token owner query","lowpaymentfee NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response bodies found in crawl","The specific NFT collection for ID 81 is not documented","Provider pages beyond the landing page returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/81/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/81/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 with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no example payloads, and the NFT collection context is unspecified. The listing is effectively a stub with verified liveness and 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'0.02':11,24,76,142 '000':67 '20':66 '402':196 '6':72 '81':36 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':47 'advertis':62 'ai/ml':112 'analysi':115 'analyt':111 'api':80,108 'architectur':221 'attach':89 'base':9,22,57,68,149 'base-network' 'broader':105 'call':42 'caller':87 'categori':161 'challeng':61,197 'classif':117 'collect':206 'confirm':191,215 'context':207 'convers':134 'crawl':187 'current':167 'data':4,17,110 'decim':73 'describ':165 'detail':178 'document':179,225 'embed':118 'endpoint':28,46,137,155,189,227 'equal':75 'estim':128 'exact':200 'exampl':181 'exchang':123 'fall':157 'feed':122 'financ':119 'format':202 'found':184 'gas':127 'general':220 'generat':135 'geocod':132 'header':94 'host':103 'individu':226 'infer':113 'infrastructur':130 'json':164 'json-response' 'key':81 'land':213 'limit':84 'live':192 'lowpaymentfee NFT' 'lowpaymentfee.com':30 'maxamountrequir':64 'micropay':7,20 'model':218 'network':58,150 'nft':2,15,35,172,205 'nft-ownership-lookup' 'no-api-key' 'note':173 'on-chain NFT data' 'openapi':176 'owner':33,168 'ownership':3,16 'page':214 'pay':40 'pay-per-cal':39 'pay-per-request' 'payment':93,99 'per':12,25,41,77,143 'post':48 'price':121,140,217 'proof':100 'proper':195 'protocol':44 'provid':102,211 'queri':1,14 'quot':126 'rate':83,124 'request':13,26,49,78,144 'requir':86 'respons':182,201 'return':31,163,193 'schema':177,228 'sentiment':114 'settl':52,146 'simpli':88 'span':109 'specif':154 'specifi':171 'suit':106 'summar':116 'token':125 'token owner query' 'uniform':139 'unit':69 'unknown':209 'usdc':54,71,152 'usdc-settlement' 'use':151 'util':131 'valid':97,133 'via':5,18,37 'web3':120 'web3/nft':160 'x':92 'x-payment':91 'x402':6,19,43,60,98 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"3aa70672-161e-4e0c-bc04-5b473a3a51bd","listingId":"4cb92fa6-4827-4795-be89-3bc3b2a22d3a","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/81/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":"2026-04-21T18:32:32.433Z"}],"sources":[{"listingId":"4cb92fa6-4827-4795-be89-3bc3b2a22d3a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/81/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.433Z","lastSeenAt":"2026-04-22T09:02:26.171Z"}],"details":{"listingId":"4cb92fa6-4827-4795-be89-3bc3b2a22d3a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/81/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 HTTP 402 with x402 challenge advertising 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/81/owner"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/81/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 provider 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","Building NFT portfolio trackers that need ownership data","Agent-driven workflows that verify NFT ownership before executing actions","Integrating NFT ownership checks into Web3 dApps without managing API keys"],"bestFor":["Developers needing simple pay-per-call NFT ownership queries","AI agents that can settle x402 payments on Base","Projects that want keyless, rate-limit-free API access"],"notFor":["Bulk enumeration of all NFT owners across a collection (single-NFT endpoint)","Users who cannot settle USDC payments on the Base network","Applications requiring detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.986Z"},"updatedAt":"2026-04-22T09:02:26.171Z"}}