{"id":"86294ea9-0635-4c26-be41-f64cf98fa9c4","shortId":"MG3NTk","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 #88. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/nfts/88/owner` accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is independently paid at the per-request price.\n\nThe platform advertises a uniform $0.02/request pricing model across all its endpoints. Settlement occurs on the Base L2 network to the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, with payments directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The x402 challenge specifies a 300-second payment timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl, so the exact response format is unknown beyond the declared `application/json` MIME type.","tags":[],"capabilities":["nft-ownership-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT owner lookup","NFT ownership API","who owns NFT","token holder query","x402 NFT endpoint","Base USDC API","micropayment API"],"warnings":["No OpenAPI or detailed API documentation available — request body and response schema are unknown.","Only NFT #88 was probed; it is unclear whether the platform supports arbitrary NFT IDs or collections.","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","The endpoint description is generic ('Premium API Access') and does not describe the NFT-specific functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/88/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/88/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 is operational. However, there is no OpenAPI schema, no documentation of request/response formats, no example payloads, and the crawled pages beyond the landing page were empty wallet-connect stubs. The specific functionality (NFT owner lookup) is only inferred from the URL path and the generic 'Premium API Access' 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'/request':146 '0.02':11,24,110,145 '000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':165 '20':104 '300':177 '6':115 '88':37 'Base USDC API' 'NFT owner lookup' 'NFT ownership API' 'accept':76 'across':51,149 'address':170 'advertis':142 'ai/ml':54 'amount':101 'analyt':53 'api':50,120 'application/json':204 'base':9,22,68,106,157 'base-network' 'beyond':201 'broader':43 'call':130 'categori':59 'challeng':174 'commit':128 'contract':163 'crawl':193 'data':4,17,52 'decim':116 'declar':203 'detail':184 'direct':168 'document':185 'endpoint':28,74,152 'exact':96,196 'exact-pay':95 'exampl':187 'finance/web3':56 'format':198 'found':190 'handl':84 'header':91 'independ':132 'infer':55 'inform':34 'infrastructur':58 'inlin':85 'json':81 'key':121 'l2':158 'limit':124 'lowpaymentfee.com':30 'maximum':100 'micropay':7,20 'micropayment API' 'mime':205 'model':148 'network':69,159 'nft':2,15,32,36 'nft-ownership-lookup' 'no-api-key' 'occur':154 'offer':45 'openapi':182 'ownership':3,16,33 'paid':133 'part':40 'pay':47 'pay-per-request':46 'payment':82,90,97,167,179 'per':12,25,48,137 'per-request':136 'platform':44,141 'post':77 'price':139,147 'protocol':65 'queri':1,14 'rate':123 'request':13,26,49,78,138 'requir':102 'respons':188,197 'return':31,80 'schema':183 'scheme':98 'second':178 'settl':61 'settlement':153 'sinc':112 'specif':73 'specifi':175 'subscript':127 'timeout':180 'token holder query' 'type':206 'uniform':144 'unit':107 'unknown':200 'usd':111 'usdc':71,109,113,162 'usdc-settlement' 'use':70,92,114 'via':5,18,62,86 'who owns NFT' 'x':89 'x-payment':88 'x402':6,19,64,94,173 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"25016782-51dc-4475-b2dd-6a58e32d0a4b","listingId":"86294ea9-0635-4c26-be41-f64cf98fa9c4","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/88/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":"2026-04-21T18:32:28.773Z"}],"sources":[{"listingId":"86294ea9-0635-4c26-be41-f64cf98fa9c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/88/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.773Z","lastSeenAt":"2026-04-22T12:05:29.491Z"}],"details":{"listingId":"86294ea9-0635-4c26-be41-f64cf98fa9c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/88/owner \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/nfts/88/owner"},{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/88/owner"}],"useCases":["Querying the current owner of a specific NFT programmatically","Integrating NFT ownership checks into agent workflows without API key management","Verifying NFT provenance or holder status in Web3 applications"],"bestFor":["Agents needing on-demand NFT ownership data with no subscription overhead","Developers prototyping Web3 apps who want instant, keyless API access","Low-volume or sporadic NFT data lookups at $0.02 per call"],"notFor":["High-volume bulk NFT indexing (no batch endpoint or volume discounts documented)","Querying NFTs beyond ID 88 (only this specific endpoint was probed; generalization is unconfirmed)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.171Z"},"updatedAt":"2026-04-22T12:05:29.491Z"}}