{"id":"2f35912b-1fec-4ece-9eab-d0e8cd029744","shortId":"hHvSGM","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 #92 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/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network using USDC.\n\nThis specific endpoint (/api/v1/nfts/92/owner) is narrowly scoped to NFT ownership lookup. The response MIME type is application/json. No OpenAPI schema, request body schema, or response body schema is documented beyond the x402 challenge metadata, so the exact request and response formats must be inferred or discovered by calling the endpoint with payment.","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","on-chain NFT data","token owner query","lowpaymentfee NFT"],"warnings":["No request or response schema documented — callers must discover the format experimentally","Endpoint is hardcoded to NFT #92; no documentation on how to query other NFT IDs","No OpenAPI spec, README, or detailed API documentation available from the crawl","The broader platform lists many API categories but none were probed; actual availability is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/92/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/92/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 OpenAPI schema, no documented request/response body format, no examples, and the endpoint is narrowly scoped to a single NFT ID. The crawled pages beyond the homepage returned only 'Connect wallet' with no additional 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'0.02':11,24,76,145 '000':67 '20':66 '6':72 '92':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 'application/json':172 'attach':90 'base':9,22,57,68,152 'base-network' 'beyond':185 'bodi':177,181 'broader':103 'call':42,203 'caller':88 'challeng':61,188 'classif':122 'convers':138 'data':4,17,115 'decim':73 'discov':201 'document':184 'embed':123 'endpoint':28,46,141,158,205 'equal':75 'estim':132 'exact':192 'exchang':127 'feed':126 'finance/web3':124 'format':196 'gas':131 'gate':112 'generat':139 'geocod':136 'header':95 'infer':118,199 'infrastructur':134 'json-response' 'key':81 'limit':83 'list':143 'lookup':166 'lowpaymentfee NFT' 'lowpaymentfee.com':30,104 'maxamountrequir':64 'metadata':189 'micropay':7,20 'mime':169 'must':197 'narrowli':161 'network':58,153 'nft':2,15,35,164 'nft-ownership-lookup' 'no-api-key' 'offer':106 'on-chain NFT data' 'openapi':174 'owner':33 'ownership':3,16,165 'pay':40 'pay-per-cal':39 'pay-per-call' 'payment':94,100,207 'per':12,25,41,77,146 'platform':105 'post':48 'price':125 'proof':101 'protocol':44 'queri':1,14 'quot':130 'rate':82,128 'request':13,26,49,78,147,176,193 'requir':87 'respons':168,180,195 'return':31 'schema':175,178,182 'scope':162 'sentiment':119 'settl':52,149 'simpli':89 'span':114 'specif':157 'subscript':85 'suit':108 'summar':121 'token':129 'token owner query' 'type':170 'unit':69 'usdc':54,71,155 'usdc-settlement' 'use':154 'util':135 'valid':98,137 'via':5,18,37 'x':93 'x-payment':92 'x402':6,19,43,60,99,111,187 'x402 NFT endpoint' 'x402-gated':110 'x402-micropayment'","prices":[{"id":"384e5830-b28e-46bc-b71c-b1a5749acd84","listingId":"2f35912b-1fec-4ece-9eab-d0e8cd029744","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/92/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":"2026-04-21T18:32:28.747Z"}],"sources":[{"listingId":"2f35912b-1fec-4ece-9eab-d0e8cd029744","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/92/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.747Z","lastSeenAt":"2026-04-22T12:05:29.431Z"}],"details":{"listingId":"2f35912b-1fec-4ece-9eab-d0e8cd029744","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/92/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","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/92/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 & 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","Automating NFT ownership checks in trading bots or marketplace integrations"],"bestFor":["Agents needing quick, keyless NFT ownership lookups","Developers who prefer pay-per-call over subscription API plans","Applications already integrated with x402 payment flows on Base"],"notFor":["Bulk querying ownership across thousands of NFTs (no batch endpoint documented)","Looking up NFTs by collection or searching across multiple token IDs (this endpoint is scoped to NFT #92)","Users who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.173Z"},"updatedAt":"2026-04-22T12:05:29.431Z"}}