{"id":"1c434a31-4d70-47a9-a6f2-c97abaaa1e59","shortId":"uwufp8","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/charges/321` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The challenge specifies the `exact` payment scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises categories including: 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","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no-auth api","crypto payment api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint — request and response formats are unknown","The specific function of /api/v1/charges/321 ('Premium API Access') is not explained anywhere","No information on uptime, SLAs, rate limits, or data sources"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/321","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/charges/321","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the specific purpose of the /api/v1/charges/321 endpoint (beyond 'Premium API Access') is unclear. The platform lists many endpoints but provides no substantive docs for any of 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'/api/v1/charges/321':110 '/docs':205 '/pricing':206 '/request':12,28 '0.02':11,27,61,137 '000':126 '0x8335':131 '20':125 '2913':132 '300':152 '402':120 '6':141 'accept':157 'access':103,116 'actual':223 'advertis':166 'ai':176 'ai-inference' 'ai/ml':51 'analysi':180 'analyt':50,170 'api':5,14,21,30,39,79,115 'application/json':162 'attach':90 'base':8,24,69,127,134 'base network api' 'broad':44 'broader':164 'call':4,20 'caller':88 'catalog':45 'categori':167 'challeng':121,144 'classif':183 'classification' 'commit':87 'connect':214 'content':220 'convers':199 'cost':60 'crypto payment api' 'crypto-quotes' 'current':210 'data':49,54,169,173 'data-analytics' 'decim':142 'document':201 'embed':184 'embeddings' 'enabl':38 'endpoint':47,59,105,108,156,228 'equal':136 'estim':194 'everi':58 'exact':147 'exchang':189 'exist':203 'export':174 'feed':188 'financ':185 'finance-data' 'finance/web3':53 'gas':193 'generat':200 'geocod':197 'geocoding' 'given':138 'header':95 'includ':168 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'x-payment':92 'x402':10,26,37,73,99 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"4e28ab8a-5fa4-46f2-be13-179dec0777f0","listingId":"1c434a31-4d70-47a9-a6f2-c97abaaa1e59","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/charges/321","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:54.494Z"}],"sources":[{"listingId":"1c434a31-4d70-47a9-a6f2-c97abaaa1e59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/321","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:54.494Z","lastSeenAt":"2026-04-23T10:00:48.844Z"}],"details":{"listingId":"1c434a31-4d70-47a9-a6f2-c97abaaa1e59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/321 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform offers 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":"The x402 challenge for /api/v1/charges/321 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/321"}],"useCases":["Agent-driven data retrieval without managing API keys or subscriptions","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates via micropayments","Geocoding and data conversion utilities with zero setup"],"bestFor":["AI agents that need frictionless, keyless API access via crypto micropayments","Developers prototyping with many different API categories at low per-call cost","Web3-native applications that prefer on-chain payment settlement over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Teams without access to USDC on Base network for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.081Z"},"updatedAt":"2026-04-23T10:00:48.844Z"}}