{"id":"c1351fbf-d0b1-48f8-83b8-8d1328813ec4","shortId":"aFBvRQ","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 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 at `/api/v1/transactions/224` 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 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-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api","crypto pay api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no actual content","No OpenAPI or schema available — request and response formats for this endpoint are completely unknown","The endpoint path '/api/v1/transactions/224' with description 'Premium API Access' is generic and its specific function is unclear","No information on uptime, SLAs, rate limits, or data sources"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/224","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/224","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). However, there is no OpenAPI schema, no documented request/response formats, and all documentation pages render only 'Connect wallet' with no content. The specific purpose of /api/v1/transactions/224 ('Premium API Access') is vague and undifferentiated from the rest of the catalog. Effectively a stub 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'/api/v1/transactions/224':96 '/docs':191 '/pricing':192 '/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':136 '402':106 '402 payment api' '6':127 'accept':141 'access':102 'account':76 'actual':209 'advertis':150 'ai':162 'ai-inference' 'ai/ml':49 'analysi':166 'analyt':48,156 'api':5,20,37,74,101 'application/json':146 'attach':84 'base':8,23,71,113,120 'base network api' 'base-network' 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':154 'challeng':107 'classif':169 'classification' 'connect':200 'content':206 'convers':185 'crypto pay api' 'crypto-data' 'current':196 'data':47,52,155,159 'data-analytics' 'decim':128 'document':187 'embed':170 'embeddings' 'enabl':36 'endpoint':45,57,94,140,151,214 'equal':122 'estim':180 'exact':133 'exchang':175 'exist':189 'export':160 'feed':174 'financ':171 'finance-data' 'finance/web3':51 'four':153 'gas':179 'generat':186 'geocod':183 'geocoding' 'given':124 'header':88 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'x402-payment'","prices":[{"id":"06e278c0-a397-4a20-bf37-dec094c47237","listingId":"c1351fbf-d0b1-48f8-83b8-8d1328813ec4","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/224","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:21.662Z"}],"sources":[{"listingId":"c1351fbf-d0b1-48f8-83b8-8d1328813ec4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/224","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:21.662Z","lastSeenAt":"2026-04-22T12:04:35.390Z"}],"details":{"listingId":"c1351fbf-d0b1-48f8-83b8-8d1328813ec4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/224 \\\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":"All endpoints priced at $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/224"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding and data validation utilities with no subscription commitment","Programmatic data export and analytics with micropayments"],"bestFor":["AI agents that need keyless, pay-as-you-go API access","Developers prototyping with low-commitment per-request pricing","Web3-native applications already operating on Base network"],"notFor":["High-volume production workloads where per-request pricing becomes expensive","Users without USDC on Base network or an x402-compatible client","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.4Z"},"updatedAt":"2026-04-22T12:04:35.390Z"}}