{"id":"dce79944-5487-492b-85cd-6a5f151211dc","shortId":"JRfsqy","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 ownership information for NFT #52. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all priced at $0.02 per call and settled via x402 using USDC on the Base network.\n\nThe specific endpoint `/api/v1/nfts/52/owner` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an `X-PAYMENT` header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys, accounts, or rate limits are required — access is granted purely through micropayment.\n\nThe platform advertises a wide catalog of endpoints (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more), all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example responses were found during crawling, so the exact shape of request bodies and responses for this NFT ownership endpoint is unknown.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-base-settlement","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","x402 NFT endpoint","Base USDC micropayment API","on-chain NFT data","token owner query"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response bodies could be found","Only NFT #52 was probed; unclear whether other NFT IDs are supported at similar paths","Crawled /api, /pricing, and /README pages returned no meaningful content","The platform lists many endpoint categories but none were verified beyond the x402 challenge on this single path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/52/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/52/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 and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no OpenAPI schema, no documented request/response format, no example payloads, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The specific NFT endpoint's functionality is only inferred from its URL 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'0.02':11,24,62,114,163 '000':108 '20':107 '52':37 '6':118 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':79 'access':129 'account':123 'across':51 'advertis':137 'ai/ml':54 'analysi':146 'analyt':53 'api':50,121 'base':9,22,73,109 'bodi':185 'broader':43 'call':64 'caller':93 'catalog':140 'categori':58 'classif':149 'crawl':178 'data':4,17,52 'decim':119 'detail':170 'document':171 'embed':150 'endpoint':28,77,142,192 'exact':181 'exampl':173 'exchang':153 'feed':152 'finance/web3':55 'found':176 'geocod':155 'grant':131 'handl':87 'header':99 'howev':166 'i.e':113 'includ':94 'inform':34 'infrastructur':57 'inlin':88 'json':84 'key':122 'limit':126 'lowpaymentfee.com':30 'metric':143 'micropay':7,20,134 'network':74 'nft':2,15,32,36,190 'nft-ownership-query' 'no-api-key' 'offer':45 'on-chain NFT data' 'openapi':168 'ownership':3,16,33,191 'part':40 'pay':47 'pay-per-request':46 'payment':85,98,103 'per':12,25,48,63 'platform':44,136 'point':165 'post':80 'price':60,151,164 'protocol':92 'pure':132 'queri':1,14 'rate':125,154 'report':144 'request':13,26,49,81,184 'requir':128 'respons':174,187 'return':31,83 'schema':169 'sentiment':145 'settl':66 'shape':182 'sign':102 'sinc':115 'specif':76 'summar':148 'text':147 'token owner query' 'unit':110 'unknown':194 'usdc':70,112,116 'usdc-base-settlement' 'use':69,117 'valid':156 'via':5,18,67,89 'wide':139 'x':97 'x-payment':96 'x402':6,19,68,91 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"3dfb09f5-6527-4a82-989f-52794019452c","listingId":"dce79944-5487-492b-85cd-6a5f151211dc","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/52/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":"2026-04-21T18:32:28.512Z"}],"sources":[{"listingId":"dce79944-5487-492b-85cd-6a5f151211dc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/52/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.512Z","lastSeenAt":"2026-04-22T13:32:33.753Z"}],"details":{"listingId":"dce79944-5487-492b-85cd-6a5f151211dc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/52/owner \\\n  -H \"X-PAYMENT: <x402-signed-payment>\" \\\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 a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/52/owner"},{"claim":"All APIs 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 asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base with 6 decimals","source_url":"https://lowpaymentfee.com"}],"useCases":["Looking up the current owner of a specific NFT programmatically","Integrating NFT ownership checks into automated agent workflows","Verifying NFT provenance or ownership without managing API keys"],"bestFor":["Agents needing quick, keyless NFT ownership lookups","Developers prototyping Web3 apps who want pay-per-call pricing","Micropayment-native workflows on Base network"],"notFor":["Bulk querying ownership across thousands of NFTs (no batch endpoint documented)","Querying NFTs beyond ID 52 (only this specific resource path was probed)","Users who need detailed NFT metadata beyond ownership"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.593Z"},"updatedAt":"2026-04-22T13:32:33.753Z"}}