{"id":"98c97246-8f3c-4efb-952a-605b26e553e5","shortId":"KwSCEd","kind":"x402","title":"Pay-per-call premium API access on Base network via x402, $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site offers a collection of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/resource/15` is one of potentially many resources on the platform. The x402 challenge confirms it accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. The site's landing page lists various API paths (analytics, AI, finance, utilities) but provides no request/response schemas, parameter descriptions, or example payloads. It is unclear what data or functionality `/api/resource/15` specifically returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto-payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment required"],"warnings":["No API documentation available — docs/pricing/API pages only show 'Connect wallet'","No request or response schema provided for /api/resource/15","Unclear what specific data or functionality this endpoint delivers","No OpenAPI spec or examples available"],"endpointUrl":"https://lowpaymentfee.com/api/resource/15","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/resource/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no indication of what /api/resource/15 actually returns. Effectively a stub 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'/request':14,30 '0.02':13,29,67,124 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':118 '20':112 '2913':119 '300':138 '402 payment required' '6':128 'Base network API' 'USDC pay-per-call' 'accept':104,143 'access':7,23,40 'address':134 'ai':56,181 'analyt':55,180 'api':6,22,39,52,79,157,178 'application/json':148 'base':9,25,75,114,121 'call':4,20 'challeng':101 'collect':50 'commit':84 'confirm':102 'connect':163 'crypto API access' 'data':54,198 'decim':129 'descript':190 'detail':170 'doc':154 'document':149 'endpoint':34,88,142 'equal':123 'exact':106 'exact-schem':105 'exampl':192 'extrem':151 'financ':59,182 'function':200 'given':125 'infrastructur':62 'json-response' 'key':80 'land':174 'learn':58 'limit':82 'list':176 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':57 'mani':94 'micropayment API' 'network':10,26,76 'no-api-key' 'offer':48 'one':91 'page':158,175 'paid':70 'paramet':189 'path':179 'pay':2,18 'pay-per-cal':1,17 'pay-per-request' 'payload':193 'payment':44,108,130 'per':3,19,68 'platform':98 'post':144 'post-method' 'potenti':93 'premium':5,21,38 'price':65,155 'prompt':165 'protocol':45 'provid':37,185 'rate':81 'render':160 'request':69,145 'request/response':187 'requir':85 'resourc':95 'return':147,203 'schema':188 'scheme':107 'second':139 'sent':132 'site':47,172 'span':53 'spars':152 'specif':87,202 'technic':169 'timeout':140 'unclear':196 'unit':115 'usdc':16,32,72,117,126 'usdc-base-network' 'util':63,183 'various':177 'via':11,27,41 'wallet':164 'web3':60 'x402':12,28,43,100 'x402 API' 'x402-payment'","prices":[{"id":"6c689882-212c-407e-8138-b9e69b3ecba4","listingId":"98c97246-8f3c-4efb-952a-605b26e553e5","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/resource/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:09.087Z"}],"sources":[{"listingId":"98c97246-8f3c-4efb-952a-605b26e553e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:09.087Z","lastSeenAt":"2026-04-22T05:30:34.242Z"}],"details":{"listingId":"98c97246-8f3c-4efb-952a-605b26e553e5","quickStartSnippet":"# Send a POST with x402 payment header to access the resource\ncurl -X POST https://lowpaymentfee.com/api/resource/15 \\\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 endpoint returns a 402 challenge accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/resource/15"},{"claim":"All APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or AI endpoints without traditional API key registration","Making one-off API calls paid per-request via USDC on Base","Integrating pay-as-you-go API services into crypto-native applications"],"bestFor":["Developers wanting keyless, pay-per-call API access","Crypto-native agents that can settle USDC on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users without USDC on Base network","High-volume consumers needing bulk pricing or SLAs","Developers requiring detailed API documentation and schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.576Z"},"updatedAt":"2026-04-22T05:30:34.242Z"}}