{"id":"64abd1f5-1357-43c3-8759-f238a004e5c4","shortId":"eXyVGj","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/transactions/230` 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. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST 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 (/docs, /pricing, /api, /README) all resolve but appear to require wallet connection and contain no substantive content, so details about request/response schemas, actual model capabilities, and data sources remain unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","json-api","no-api-key","http-post"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","cheap API"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) require wallet connection and contain no readable content","No OpenAPI or schema documentation available — request and response formats are unknown","The specific purpose of /api/v1/transactions/230 ('Premium API Access') is not described anywhere","The platform advertises many endpoint categories but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/230","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/transactions/230","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, documentation pages are effectively empty (wallet-gated), there is no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/transactions/230 is unexplained. The listing is essentially a stub with confirmed liveness and 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'/api/v1/transactions/230':93 '/docs':189 '/pricing':190 '/readme':192 '/request':13,28 '0.02':12,27,74,120 '000':109 '0x8335':114 '20':108 '2913':115 '300':136 '402':103 '6':124 'Base network API' 'USDC API' 'accept':141 'access':99 'actual':211 'advertis':150 'ai':162 'ai/ml':49 'analysi':166 'analyt':48,156 'api':5,20,37,79,98 'appear':196 'application/json':146 'base':8,23,67,110,117 'broad':42 'broader':148 'call':4,19,76 'capabl':213 'catalog':43 'categori':154 'challeng':104 'cheap API' 'classif':169 'commit':87 'connect':200 'contain':202 'content':205 'convers':185 'data':47,52,155,159,215 'decim':125 'detail':207 'document':187 'embed':170 'enabl':36 'endpoint':45,57,91,140,151 'equal':119 'estim':180 'exact':132 'exchang':175 'export':160 'feed':174 'financ':171 'finance/web3':51 'flat':71 'four':153 'gas':179 'generat':186 'geocod':183 'given':121 'http':142 'http-post' 'infer':50 'infrastructur':182 'insight':161 'json-api' 'key':80 'learn':164 'limit':83 'list':95 'low 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'x402-payment'","prices":[{"id":"11edcd59-3697-471d-95b4-3319adeebdca","listingId":"64abd1f5-1357-43c3-8759-f238a004e5c4","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/transactions/230","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:29.408Z"}],"sources":[{"listingId":"64abd1f5-1357-43c3-8759-f238a004e5c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/230","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:29.408Z","lastSeenAt":"2026-04-22T19:32:15.809Z"}],"details":{"listingId":"64abd1f5-1357-43c3-8759-f238a004e5c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/230 \\\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":"Flat pricing of $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/transactions/230"},{"claim":"Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Paying per-call for analytics, AI inference, or financial data via crypto micropayments","Integrating x402-compatible endpoints into automated workflows on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402 payment capability on Base","Low-volume or bursty workloads where flat per-request pricing is economical"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume production workloads requiring bulk pricing or rate-limit guarantees","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.053Z"},"updatedAt":"2026-04-22T19:32:15.809Z"}}