{"id":"1f052a99-398f-45c8-83d8-6c127bab5ecf","shortId":"nUJAbc","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 #84 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 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 endpoint is part of a broader platform (lowpaymentfee.com) that offers multiple API categories including data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform are priced at $0.02 per request and settle on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/84/owner` accepts POST requests and returns JSON. No OpenAPI schema or detailed documentation was found beyond the x402 challenge and the platform's landing page. The exact response format is not documented, so callers should expect a JSON object containing NFT ownership information but the precise fields are unknown.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-payment","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","token holder query","ERC-721 owner","NFT metadata","on-chain NFT data","x402 NFT API"],"warnings":["No OpenAPI or detailed API documentation available","Response schema is completely undocumented — field names and structure are unknown","Endpoint is hardcoded to NFT #84; unclear if other NFT IDs are supported at different paths","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content","No information about which NFT collection or chain the NFT #84 belongs to"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/84/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/84/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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the endpoint is narrowly scoped to a single NFT ID. The platform landing page provides only a high-level overview with no technical 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'0.02':11,24,72,147 '000':63 '20':62 '6':68 '84':36 'ERC-721 owner' 'NFT metadata' 'NFT owner lookup' 'NFT ownership API' 'accept':162 'advertis':58 'ai/ml':114 'analysi':117 'analyt':113 'api':76,109 'attach':85 'base':9,22,53,64,154 'base-network' 'beyond':176 'broader':103 'call':42 'caller':83,194 'categori':110 'challeng':57,179 'classif':119 'contain':200 'convers':137 'data':4,17,112,123 'decim':69 'detail':172 'document':173,192 'embed':120 'endpoint':28,98,140,160 'equal':71 'estim':131 'exact':187 'exchang':126 'expect':196 'feed':125 'field':207 'financ':121 'format':189 'found':175 'gas':130 'generat':138 'geocod':135 'header':90 'includ':111 'infer':115 'inform':203 'infrastructur':133 'json':167,198 'json-response' 'key':77 'land':184 'limit':80 'lowpaymentfee.com':30,105 'maxamountrequir':60 'micropay':7,20 'multipl':108 'network':54,155 'nft':2,15,35,201 'nft-ownership-lookup' 'no-api-key' 'object':199 'offer':107 'on-chain NFT data' 'openapi':169 'owner':33 'ownership':3,16,202 'page':185 'part':100 'pay':40 'pay-per-cal':39 'pay-per-call' 'payment':46,89,95 'per':12,25,41,73,148 'platform':104,143,182 'post':163 'precis':206 'price':124,145 'proof':96 'protocol':44 'queri':1,14 'quot':129 'rate':79,127 'request':13,26,74,149,164 'requir':82 'respons':188 'return':31,166 'schema':170 'sentiment':116 'settl':48,151 'simpli':84 'specif':159 'summar':118 'token':128 'token holder query' 'unit':65 'unknown':209 'usdc':50,67,157 'usdc-payment' 'use':156 'util':134 'valid':93,136 'via':5,18,37 'web3':122 'x':88 'x-payment':87 'x402':6,19,43,56,94,178 'x402 NFT API' 'x402-micropayment'","prices":[{"id":"40b0e353-23ee-4165-878c-e659f7ba60f8","listingId":"1f052a99-398f-45c8-83d8-6c127bab5ecf","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/84/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":"2026-04-21T18:32:32.548Z"}],"sources":[{"listingId":"1f052a99-398f-45c8-83d8-6c127bab5ecf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/84/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.548Z","lastSeenAt":"2026-04-22T07:32:40.698Z"}],"details":{"listingId":"1f052a99-398f-45c8-83d8-6c127bab5ecf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/84/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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/84/owner"},{"claim":"All endpoints on the platform 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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT programmatically","Building NFT portfolio dashboards that need ownership verification","Automated agents verifying NFT ownership before executing trades or actions"],"bestFor":["Agents needing one-off NFT ownership checks without managing API keys","Low-volume, pay-as-you-go NFT data queries","Developers prototyping Web3 applications that need ownership data"],"notFor":["Bulk or high-throughput NFT indexing across thousands of tokens (no batch endpoint documented)","Querying NFTs beyond the hardcoded token ID 84 (endpoint path is specific to NFT #84)","Users who need historical ownership data or transfer history"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.841Z"},"updatedAt":"2026-04-22T07:32:40.698Z"}}