{"id":"73e026ea-890c-4630-bdf1-2d6e05ff32f6","shortId":"v46JVU","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 ID 91. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The max amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call. There are no API keys, no rate limits, and no subscriptions — callers pay per request with USDC on Base. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the payment timeout is 300 seconds.\n\nThe specific endpoint `/api/v1/nfts/91/owner` appears to be an NFT-related query not prominently listed on the site's landing page, which primarily advertises analytics, AI, finance, and utility endpoints. Documentation beyond the landing page is minimal — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional content. No OpenAPI schema, request/response examples, or detailed docs were found.","tags":[],"capabilities":["nft-ownership-query","x402-micropayment","usdc-payment","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","pay-per-call NFT data","lowpaymentfee NFT"],"warnings":["No OpenAPI or detailed documentation available — /api, /pricing, and /README pages all return only a 'Connect wallet' prompt","No request body schema or response schema documented; callers must guess at the expected input and output format","This specific NFT endpoint (/api/v1/nfts/91/owner) is not listed among the advertised APIs on the landing page","The endpoint is hardcoded to NFT ID 91; it is unclear whether other NFT IDs are queryable via similar paths"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/91/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/91/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 request/response examples, and no documentation beyond a landing page. The specific NFT endpoint is not listed on the site. Effectively a stub 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'/api/v1/nfts/91/owner':150 '/pricing':186 '/readme':188 '0.02':11,24,112 '000':101 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':106 '20':100 '2913':107 '300':145 '91':38 'Base USDC micropayment API' 'NFT owner lookup' 'NFT ownership API' 'accept':74 'across':52 'addit':199 'address':137 'advertis':170 'ai':172 'ai/ml':55 'amount':97 'analyt':54,171 'api':51,118 'appear':151 'base':9,22,68,102,109,133 'base-network' 'beyond':178 'broader':44 'call':50,114 'caller':126 'categori':59 'connect':194 'content':200 'data':4,17,53 'detail':207 'doc':208 'document':177 'endpoint':28,73,149,176 'equal':111 'exact':93 'exampl':205 'financ':173 'finance/web3':56 'found':210 'handl':82 'header':89 'id':37 'inform':34 'infrastructur':58 'inlin':83 'json':79 'json-response' 'key':119 'land':166,180 'limit':122 'list':161 'lowpaymentfee NFT' 'lowpaymentfee.com':30 'max':96 'micropay':7,20 'minim':183 'network':69 'nft':2,15,32,36,156 'nft-ownership-query' 'nft-relat':155 'no-api-key' 'offer':46 'openapi':202 'ownership':3,16,33 'page':167,181,189 'part':41 'pay':48,127 'pay-per-cal':47 'pay-per-call NFT data' 'pay-per-request' 'payment':80,88,135,142 'per':12,25,49,113,128 'platform':45 'post':75 'primarili':169 'promin':160 'prompt':196 'protocol':65 'queri':1,14,158 'rate':121 'recipi':136 'relat':157 'request':13,26,76,129 'request/response':204 'requir':98 'resolv':191 'return':31,78 'schema':203 'scheme':94 'second':146 'settl':61 'site':164 'specif':148 'subscript':125 'timeout':143 'unit':103 'usdc':71,105,131 'usdc-payment' 'use':70,90 'util':175 'via':5,18,62,84 'wallet':195 'x':87 'x-payment':86 'x402':6,19,64,92 'x402 NFT endpoint' 'x402-micropayment'","prices":[{"id":"a18e6772-49cd-41de-b956-dcb198cea5e5","listingId":"73e026ea-890c-4630-bdf1-2d6e05ff32f6","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/91/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":"2026-04-21T18:32:28.876Z"}],"sources":[{"listingId":"73e026ea-890c-4630-bdf1-2d6e05ff32f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/91/owner","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.876Z","lastSeenAt":"2026-04-22T10:03:06.044Z"}],"details":{"listingId":"73e026ea-890c-4630-bdf1-2d6e05ff32f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/91/owner \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, requiring max 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/nfts/91/owner"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC on Base uses 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying the current owner of a specific NFT (ID 91) programmatically","Integrating NFT ownership checks into agent workflows without API key management","Paying per-call for on-demand NFT data using USDC on Base"],"bestFor":["Agents or bots needing quick NFT ownership lookups without subscription overhead","Developers prototyping x402-based payment flows","Low-volume, on-demand NFT data queries"],"notFor":["Bulk or high-throughput NFT indexing (no batch endpoint documented)","Users who need detailed NFT metadata, transfer history, or collection-level queries","Anyone without USDC on Base for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.049Z"},"updatedAt":"2026-04-22T10:03:06.044Z"}}