{"id":"af1adbd5-2521-4100-bc2c-962741dcccf8","shortId":"eWsXBr","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/policies/100` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints in four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). Documentation pages exist at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api","crypto api access"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats for all endpoints are unknown","The endpoint name 'Premium API Access' and path '/api/v1/policies/100' give no clear indication of what data is returned","Cannot verify that the advertised AI, finance, and utility endpoints actually function — only the /api/v1/policies/100 endpoint was probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/100","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/policies/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response formats, and all documentation pages render only 'Connect wallet' with no content. The specific endpoint '/api/v1/policies/100' has a generic 'Premium API Access' description with no indication of what data it actually returns. Effectively a stub 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'/api/v1/policies/100':95 '/call':13,28 '/docs':190 '/pricing':191 '0.02':12,27,64,122 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402 payment api' '6':126 'accept':140 'access':101 'account':76 'actual':208 'advertis':149 'ai':161 'ai-inference' 'ai/ml':49 'analysi':165 'analyt':48,155 'api':5,20,37,74,100 'application/json':145 'attach':84 'base':8,23,71,112,119 'base network api' 'broad':42 'broader':147 'caller':82 'categori':153 'challeng':106 'classif':168 'classification' 'collect':43 'connect':199 'content':205 'convers':184 'conversion' 'crypto api access' 'crypto-quotes' 'current':195 'data':47,52,154,158 'data-analytics' 'decim':127 'document':186 'embed':169 'embeddings' 'enabl':36 'endpoint':45,57,94,139,150,213 'equal':121 'estim':179 'exact':132 'exchang':174 'exist':188 'export':159 'feed':173 'financ':170 'finance-data' 'finance/web3':51 'four':152 'gas':178 'gas-estimates' 'generat':185 'geocod':182 'geocoding' 'given':123 'header':88 'individu':212 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'x402-payment'","prices":[{"id":"70693720-3fad-41cd-81aa-d0d2afb00e71","listingId":"af1adbd5-2521-4100-bc2c-962741dcccf8","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/policies/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:51.755Z"}],"sources":[{"listingId":"af1adbd5-2521-4100-bc2c-962741dcccf8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:51.755Z","lastSeenAt":"2026-04-22T15:01:44.071Z"}],"details":{"listingId":"af1adbd5-2521-4100-bc2c-962741dcccf8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/100 \\\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 lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/policies/100"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Running geocoding, data validation, or format conversion as utility calls from automated workflows","Exporting analytics data or generating insights reports on a pay-as-you-go basis","Demonstrating or testing x402 payment protocol integrations at low cost"],"bestFor":["AI agents that need keyless, pay-per-request access to diverse utility endpoints","Developers prototyping x402 payment flows on Base","Applications requiring low-cost micropayment-gated API calls without subscriptions"],"notFor":["High-volume production workloads where per-request pricing adds up (no bulk discounts documented)","Users who need detailed API documentation or guaranteed SLAs (docs pages are currently empty)","Applications requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.914Z"},"updatedAt":"2026-04-22T15:01:44.071Z"}}