{"id":"ee3d3847-1afd-4587-8700-6272ea204404","shortId":"juFWA7","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 set 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 with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/314` 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 but appear to require wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-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":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only a 'Connect wallet' prompt — no usable docs are publicly accessible.","No OpenAPI or schema available; request and response formats are unknown.","The specific endpoint /api/v1/transactions/314 is not listed among the advertised endpoints on the homepage — its purpose is unclear.","The platform advertises many endpoint categories (AI, finance, analytics, etc.) but without accessible docs it is impossible to verify they actually function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/314","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/314","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, documentation pages all resolve to a wallet-connect prompt with no actual content, so there are no request/response schemas, no OpenAPI spec, and no concrete examples of what the endpoints return. The specific endpoint '/api/v1/transactions/314' has no description beyond 'Premium API Access', making its actual function 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'/request':13,28 '0.02':12,27,59,130 '000':119 '0x8335':124 '20':118 '2913':125 '300':143 '6':134 'accept':148 'access':109 'advertis':157 'ai':169 'ai-inference' 'ai/ml':49 'analysi':173 'analyt':48,163 'api':5,20,37,71,108 'appear':198 'application/json':153 'attach':87 'avail':211 'base':8,23,67,120,127 'base network api' 'broad':42 'broader':155 'call':4,19 'caller':86 'categori':161 'challeng':114 'classif':176 'classification' 'commit':78 'connect':202 'convers':192 'conversion' 'cost':58 'crawl':214 'crypto-quotes' 'data':47,52,162,166 'data-analytics' 'decim':135 'detail':206 'document':194 'embed':177 'embeddings' 'enabl':36 'endpoint':45,57,101,147,158 'equal':129 'estim':187 'everi':56 'exact':140 'exchang':182 'exist':196 'export':167 'feed':181 'financ':178 'finance-data' 'finance/web3':51 'four':160 'fulfil':94 'gas':186 'gas-estimates' 'generat':193 'geocod':190 'geocoding' 'given':131 'handl':83 'header':90 'infer':50 'infrastructur':189 'inlin':85 'insight':168 'key':72 'learn':171 'limit':75 'list':105 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':170 'metric':164 'micropayment api' 'network':9,24,68 'offer':40 'page':195 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,89,137 'per':3,18,60 'platform':6,21,38,156 'post':149 'premium':107 'price':180 'protocol':82 'quot':185 'rate':74,183 'report':165 'request':61,96,115,150 'request/response':207 'requir':79,200 'return':111,152 'schema':208 'scheme':138 'second':144 'sentiment':172 'sentiment-analysis' 'server':93 'servic':55 'set':43 'span':46 'specif':100 'summar':175 'text':174 'text-summarization' 'timeout':145 'token':184 'unit':121 'upon':97 'usdc':15,30,64,123,132 'usdc api' 'usdc-base-network' 'util':54 'valid':191 'validation' 'verif':98 'via':10,25 'view':204 'wallet':201 'web3':179 'x402':11,26,35,81,113 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7a3d4dc2-bd86-41d7-b3a6-1b8d8244d197","listingId":"ee3d3847-1afd-4587-8700-6272ea204404","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/314","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:00.448Z"}],"sources":[{"listingId":"ee3d3847-1afd-4587-8700-6272ea204404","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/314","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:00.448Z","lastSeenAt":"2026-04-22T19:32:18.108Z"}],"details":{"listingId":"ee3d3847-1afd-4587-8700-6272ea204404","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/314 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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/314"},{"claim":"Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time crypto price feeds and gas estimates without API key management","Running AI inference tasks (sentiment, summarization, classification) on a per-call payment basis","Accessing geocoding and data conversion utilities with instant USDC micropayments","Exporting analytics data and insights via pay-as-you-go endpoints"],"bestFor":["Developers who want instant API access without signup or API key provisioning","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where bulk pricing or subscriptions would be cheaper","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.137Z"},"updatedAt":"2026-04-22T19:32:18.108Z"}}