{"id":"c8a38259-2f23-4680-b4e9-d072e74ec592","shortId":"6rqHYH","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API endpoint on Base via x402 — $0.02/request in USDC.","description":"This endpoint at `/api/endpoint-60` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are accessed via the x402 payment protocol, settling in USDC on the Base network. The platform advertises a flat $0.02 per request with no API keys, no rate limits, and instant access.\n\nThe specific endpoint `/api/endpoint-60` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that generic title. It does not appear in the site's listed API catalog (which uses `/api/v1/` and `/api/v2/` path prefixes), so its purpose is unclear. The x402 challenge confirms it is live and accepts POST requests, requiring up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 given USDC's 6 decimals. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns. Prospective users should be aware that the actual behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access"],"warnings":["Endpoint functionality is entirely undocumented — 'Premium API Access' is the only description available","This endpoint path (/api/endpoint-60) does not appear in the site's listed API catalog","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content","No OpenAPI schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-60","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/endpoint-60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality is completely undescribed. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1':129 '/api/v2':131 '/request':13,28 '0.02':12,27,83,164 '000':154 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':175 '0x8335':159 '20':153 '300':178 '6':168 'Base network API' 'USDC micropayment endpoint' 'accept':147 'access':65,95,104 'actual':226 'address':174 'advertis':80 'ai':54 'analyt':53 'api':6,21,50,88,103,125,189 'appear':119 'awar':223 'base':9,24,76,155,161 'behavior':227 'beyond':112 'call':4,19 'catalog':126 'challeng':141 'collect':44 'confirm':142 'connect':195 'content':201 'data':52 'decim':169 'descript':212 'doc':186 'document':111,181 'endpoint':7,22,32,63,98,217,230 'equal':163 'exact':107 'exampl':209 'extrem':183 'financ':57 'flat':82 'function':108 'generic':114 'given':165 'http-post' 'infrastructur':60 'instant':94 'json-response' 'key':89 'label':101 'learn':56 'limit':92 'list':124 'live':145 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':55 'made':172 'network':77 'offer':42 'openapi':205 'page':190 'part':36 'particular':216 'path':132 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':69,170 'per':3,18,48,84 'platform':40,79 'post':148 'prefix':133 'premium':5,20,102 'premium API access' 'price':187 'prompt':197 'prospect':219 'protocol':70 'purpos':136 'rate':91 'render':192 'request':49,85,149 'request/response':208 'requir':150 'return':218 'schema':206 'second':179 'settl':71 'site':122 'span':51 'spars':184 'specif':97 'timeout':180 'titl':115 'unclear':138 'undocu':232 'unit':156 'usdc':15,30,73,158,166 'usdc-base' 'use':128 'user':220 'util':61 'via':10,25,66 'wallet':196 'web3':58 'x402':11,26,68,140 'x402 API' 'x402-payment'","prices":[{"id":"da96f636-b20f-4555-b170-d6c98242a9bb","listingId":"c8a38259-2f23-4680-b4e9-d072e74ec592","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/endpoint-60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:30.967Z"}],"sources":[{"listingId":"c8a38259-2f23-4680-b4e9-d072e74ec592","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:30.967Z","lastSeenAt":"2026-04-22T20:00:44.036Z"}],"details":{"listingId":"c8a38259-2f23-4680-b4e9-d072e74ec592","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-60 \\\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 platform charges $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requires up to 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/endpoint-60"},{"claim":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/endpoint-60"},{"claim":"The site lists APIs under Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an undocumented premium API service for $0.02 per call","Agent-driven API consumption without API keys or account setup","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-call API access on Base","Testing micropayment-gated endpoint consumption"],"notFor":["Users who need documented, well-specified API contracts","Production workloads requiring SLA guarantees or detailed error handling","Anyone needing to understand the response format before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.601Z"},"updatedAt":"2026-04-22T20:00:44.036Z"}}