{"id":"f5742c0b-15c7-4a5a-89b5-23b9b14ca1db","shortId":"NADu5G","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","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. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. The platform advertises $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/transactions/195` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 exact scheme with a 300-second timeout.\n\nThe platform's landing page lists 16 endpoints across 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). However, documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and schemas of these endpoints remain unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","no api key","serverless api"],"warnings":["All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content","No OpenAPI or schema available — endpoint input/output formats are unknown","The specific endpoint /api/v1/transactions/195 is labeled 'Premium API Access' but its actual functionality is not described anywhere","The breadth of claimed capabilities (AI, finance, geocoding, etc.) is unverified — no response examples exist"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/195","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/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and all doc pages return only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/transactions/195 is unclear — it could be any of the listed services or something else 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'/api/v1/transactions/195':102 '/docs':203 '/pricing':205 '/readme':206 '/request':13,30 '0.02':12,29,81,134 '000':118 '0x8335':123 '16':163 '20':117 '2913':124 '300':154 '402':112 '6':130 'access':108 'across':84,165 'actual':220 'advertis':80,142 'ai':175 'ai-inference' 'ai/ml':53 'analysi':179 'analyt':52,169 'api':5,15,22,32,41,89,107 'base':8,25,71,119,126 'base network api' 'behavior':221 'broad':46 'call':4,21,136 'categori':167 'challeng':113 'classif':182 'classification' 'commit':97 'connect':211 'consist':137 'content':217 'convers':198 'crypto-quotes' 'data':51,56,168,172 'data-analytics' 'decim':131 'document':201 'embed':183 'embeddings' 'enabl':40 'endpoint':49,61,86,100,164,226 'equal':133 'estim':193 'exact':150 'exchang':188 'export':173 'feed':187 'financ':184 'finance-data' 'finance/web3':55 'four':166 'gas':192 'generat':199 'geocod':196 'geocoding' 'howev':200 'infer':54 'infrastructur':195 'insight':174 'key':16,33,90 'land':160 'learn':177 'limit':93 'list':104,162 'low payment fee' 'lowpaymentfee.com':35 'machin':176 'made':146 'metric':170 'micropayment api' 'minimum':96 'network':9,26,72 'no api key' 'offer':44 'page':161,202 'pay':2,19,64 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':63 'payment':144 'per':3,20,65,82,135 'platform':6,23,42,79,158 'premium':106 'price':143,186 'prompt':213 'protocol':77 'quot':191 'rate':92,189 'remain':227 'report':171 'request':66,83,114 'requir':17,34 'return':110,208 'schema':223 'scheme':151 'second':155 'sentiment':178 'sentiment-analysis' 'serverless api' 'servic':59 'set':47 'settl':73 'sinc':127 'site':140 'span':50 'specif':99 'substant':216 'summar':181 'text':180 'text-summarization' 'timeout':156 'token':190 'unit':120 'unverifi':228 'usdc':68,122,128 'usdc api' 'usdc-base' 'use':67,129 'util':58 'utility-services' 'valid':197 'via':10,27,74,147 'wallet':212 'web3':185 'x402':11,28,39,76,149 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"d72dfc16-4536-41ff-8d09-d2f7bca27280","listingId":"f5742c0b-15c7-4a5a-89b5-23b9b14ca1db","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/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:07.826Z"}],"sources":[{"listingId":"f5742c0b-15c7-4a5a-89b5-23b9b14ca1db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/195","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:07.826Z","lastSeenAt":"2026-04-22T21:31:37.525Z"}],"details":{"listingId":"f5742c0b-15c7-4a5a-89b5-23b9b14ca1db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/195 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"16 endpoints listed across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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/195"},{"claim":"Documentation pages /docs, /api, /pricing, /README all returned only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions","Fetching real-time crypto quotes, gas estimates, and exchange rates with micropayments","Running geocoding, validation, or data conversion tasks without managing API keys","Exporting data or generating analytics reports paid per request via USDC on Base"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic usage where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Teams without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.139Z"},"updatedAt":"2026-04-22T21:31:37.525Z"}}