{"id":"3d15848a-117d-451b-95ac-dbf25ec0585d","shortId":"S5r8zK","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is pay-per-call at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/apikeys/5` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 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 16+ endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & ML (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 wallet-connect prompt with no substantive content, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-micropayment","usdc-payment","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","cheap API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only a wallet-connect prompt with no actual content.","No OpenAPI or schema available — request and response formats for all endpoints are unknown.","The specific function of /api/v1/apikeys/5 ('Premium API Access') is ambiguous; it may be a meta-endpoint for purchasing API keys rather than a data endpoint.","No information on uptime, SLAs, or rate limits beyond the claim of 'no rate limits'."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/5","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/apikeys/5","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 request/response examples, and all documentation pages render only a wallet-connect prompt. The specific purpose of the /api/v1/apikeys/5 endpoint beyond 'Premium API Access' is 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'/api/v1/apikeys/5':97 '/docs':191 '/pricing':192 '0.02':9,22,61,123 '000':112 '0x8335':117 '16':151 '20':111 '2913':118 '300':136 '6':127 'Base network API' 'USDC API' 'accept':141 'access':3,16,103 'across':153 'actual':210 'advertis':107,150 'ai':45,163 'ai-inference' 'analysi':166 'analyt':44,157 'api':2,15,33,74,102 'application/json':146 'attach':85 'base':8,21,69,113,120 'base-network' 'broad':38 'broader':148 'call':59 'caller':83 'categori':155 'challeng':106 'cheap API access' 'classif':169 'classification' 'commit':82 'connect':202 'content':207 'convers':185 'conversion' 'crypto-paid API' 'crypto-quotes' 'current':196 'data':43,156,160 'data-analytics' 'decim':128 'document':187 'embed':170 'embeddings' 'enabl':32 'endpoint':41,54,95,140,152,215 'equal':122 'estim':180 'everi':53 'exact':133 'exchang':175 'exist':189 'export':161 'feed':174 'financ':48,171 'finance-data' 'four':154 'gas':179 'gas-estimates' 'generat':186 'geocod':183 'geocoding' 'given':124 'header':89 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'x402-micropayment'","prices":[{"id":"a6a31222-97c5-4dbc-8af9-5e743b8aa0b8","listingId":"3d15848a-117d-451b-95ac-dbf25ec0585d","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/apikeys/5","description":"Premium API 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platform offers 16+ endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, no minimums, settled on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/apikeys/5"},{"claim":"Documentation pages render only a wallet-connect prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, and exchange rates via micropayment","Geocoding, data validation, and format conversion as utility microservices","Exporting analytics metrics and reports on a per-request billing basis"],"bestFor":["AI agents that need stateless, pay-per-call access to diverse utility endpoints","Developers who want zero-signup API access settled in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation or guaranteed SLAs (docs are currently empty)","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.437Z"},"updatedAt":"2026-04-22T05:31:51.477Z"}}