{"id":"9b095f08-fa94-43ae-8f9b-cbfe7af8dba5","shortId":"rkq9bE","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/nfts/97` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint appears to serve NFT-related data (resource ID 97), though the exact response payload is undocumented. Payment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 \"exact\" scheme.\n\nThe x402 challenge advertises a `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this converts to $0.02 per request — consistent with the site-wide flat pricing of $0.02/request displayed on the landing page. The platform emphasizes simplicity: no API keys, no rate limits, no commitments, and instant access. All endpoints accept POST requests.\n\nDocumentation is extremely sparse. The landing page lists endpoint paths and prices but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. Because this specific endpoint (`/nfts/97`) is not listed on the landing page among the advertised API categories, its exact purpose and response format are unclear — it may be a test or demo endpoint. The endpoint is live and returns a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","post-method"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","lowpaymentfee NFT","USDC micropayment API","Base network API"],"warnings":["No request or response schema documented anywhere","The /api/v1/nfts/97 endpoint is not listed on the provider's landing page among advertised APIs — its purpose is unclear","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No examples, no OpenAPI spec, no README content available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/97","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on request parameters, response schema, or what data /nfts/97 actually returns. The endpoint is not even listed among the provider's advertised APIs. Effectively a stub 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'/api/v1/nfts/97':32 '/nfts/97':200 '/pricing':180 '/readme':182 '/request':130 '0.02':10,24,117,129 '000':106 '0x8335':91 '20':105 '2913':92 '402':237 '6':112 '97':73 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'accept':153 'access':150 'addit':194 'advertis':101,210 'ai/ml':55 'among':208 'analyt':54 'api':51,141,211 'appear':64 'base':8,22,86,107 'base-network' 'categori':212 'challeng':100,238 'collect':42 'commit':147 'connect':189 'consist':120 'content':195 'contract':90 'convert':115 'data':5,19,53,70 'decim':113 'demo':227 'descript':174 'display':131 'document':156 'emphas':138 'endpoint':6,20,30,63,152,164,199,228,230 'exact':76,96,214 'exampl':177 'extrem':158 'finance/web3':57 'flat':126 'format':218 'gate':3,17 'id':72 'infer':56 'infrastructur':59 'instant':149 'key':142 'land':134,161,206 'limit':145 'list':163,203 'live':232 'lowpaymentfee NFT' 'lowpaymentfee.com':37 'maxamountrequir':103 'may':222 'minim':188 'network':87 'nft':4,18,68 'nft-data' 'nft-relat':67 'no-api-key' 'offer':40 'page':135,162,183,207 'paramet':173 'part':34 'path':165 'pay':9,23,48 'pay-per-call NFT' 'pay-per-request':47 'payload':78 'payment':81 'per':11,25,49,118 'platform':38,137 'post':154 'post-method' 'price':127,167 'prompt':191 'protocol':46 'provid':169 'purpos':215 'rate':144 'relat':69 'request':12,26,50,119,155 'request/response':171 'resolv':185 'resourc':71 'respons':77,217 'return':234 'schema':172 'scheme':97 'serv':66 'settl':83 'simplic':139 'sinc':109 'site':124 'site-wid':123 'span':52 'spars':159 'specif':62,198 'test':225 'though':74 'unclear':220 'undocu':80 'unit':108 'usag':176 'usdc':14,28,89,110 'usdc-settlement' 'use':88,111 'util':60 'valid':236 'via':93 'wallet':190 'wide':125 'x402':2,16,45,95,99 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"abaa8173-e2e5-4ea2-a4ff-d760f6c414dc","listingId":"9b095f08-fa94-43ae-8f9b-cbfe7af8dba5","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.074Z"}],"sources":[{"listingId":"9b095f08-fa94-43ae-8f9b-cbfe7af8dba5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.074Z","lastSeenAt":"2026-04-22T10:33:02.113Z"}],"details":{"listingId":"9b095f08-fa94-43ae-8f9b-cbfe7af8dba5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/97 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/97"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/97"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token ID via a single paid request","Integrating pay-per-call NFT data into an agent workflow without managing API keys","Programmatic access to NFT information settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-request NFT data access","AI agents that can settle x402 micropayments on Base","Prototyping Web3 data integrations with minimal setup"],"notFor":["Production workloads requiring documented schemas and SLAs","Bulk NFT data retrieval where per-request pricing is inefficient","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.702Z"},"updatedAt":"2026-04-22T10:33:02.113Z"}}