{"id":"0b1a4778-aac0-41a5-b697-67773609a1be","shortId":"fSP46x","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/crypto 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. The x402 protocol eliminates the need for API keys, accounts, or subscriptions — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/300` 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, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nThe broader platform advertises 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). Documentation pages exist but appear to require a wallet connection and contain no visible technical content, so the actual request/response schemas for these endpoints are unknown.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["ai","data","finance","infrastructure"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","low fee API","Base network API","crypto payment API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only a 'Connect wallet' prompt with no visible technical content","No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/charges/300 ('Premium API Access') is not explained — it is unclear what data or service it returns","Request and response formats are entirely unknown; example payloads cannot be provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/300","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/charges/300","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are empty (wallet-gated), there is no OpenAPI schema, no request/response examples, and the actual functionality behind '/api/v1/charges/300' is unclear beyond the label 'Premium API Access'. The broader platform lists many endpoints but none have documented 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'/request':13,30 '0.02':12,29,78,133 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':127 '20':121 '2913':128 '300':146 '402':116 '6':137 'Base network API' 'USDC API' 'access':112 'account':90 'across':158 'actual':211 'address':151 'advertis':156 'ai':168 'ai-inference' 'ai/ml':53 'analysi':172 'analyt':52,162 'api':5,15,22,32,41,88,111 'appear':197 'attach':95 'base':8,25,71,123,130 'broad':46 'broader':154 'call':4,21,80 'caller':93 'categori':160 'challeng':117 'classif':175 'classification' 'connect':202 'contain':204 'content':208 'convers':191 'crypto payment API' 'crypto-data' 'data':51,56,161,165 'data-analytics' 'decim':138 'document':193 'elimin':84 'embed':176 'embeddings' 'enabl':40 'endpoint':49,61,104,157,216 'equal':132 'estim':186 'exact':143 'exchang':181 'exist':195 'export':166 'feed':180 'financ':177 'finance-data' 'finance/crypto':55 'flat':75 'four':159 'gas':185 'generat':192 'geocod':189 'geocoding' 'given':134 'header':98 'infer':54 'infrastructur':188 'insight':167 'key':16,33,89 'learn':170 'list':108 'low fee API' 'lowpaymentfee.com':35 'machin':169 'metric':163 'micropayment API' 'need':86 'network':9,26,72 'no-api-key' 'offer':44 'page':194 'paid':63 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':97,140 'per':3,20,65,79 'per-request':64 'per-request-pricing' 'platform':6,23,42,155 'premium':110 'price':179 'protocol':83 'quot':184 'rate':76,182 'report':164 'request':66,101,118 'request/response':212 'requir':17,34,199 'return':114 'schema':213 'scheme':141 'second':147 'sentiment':171 'sentiment-analysis' 'servic':59 'set':47 'settl':149 'simpli':94 'span':50 'specif':103 'subscript':92 'summar':174 'technic':207 'text':173 'text-summarization' 'timeout':148 'token':183 'unit':124 'unknown':218 'usdc':68,126,135 'usdc-base' 'use':67 'util':58 'utility-services' 'valid':190 'via':10,27 'visibl':206 'wallet':201 'web3':178 'x402':11,28,39,82 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"a38b01fb-d2c9-464f-9bc8-bf78d6e9bf66","listingId":"0b1a4778-aac0-41a5-b697-67773609a1be","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/charges/300","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:04.868Z"}],"sources":[{"listingId":"0b1a4778-aac0-41a5-b697-67773609a1be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/300","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:04.868Z","lastSeenAt":"2026-04-22T16:31:15.975Z"}],"details":{"listingId":"0b1a4778-aac0-41a5-b697-67773609a1be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/300 \\\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 across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/300"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment","Running geocoding or data validation as a utility service from an autonomous agent","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse API endpoints","Developers who want to avoid subscription commitments for low-volume usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.595Z"},"updatedAt":"2026-04-22T16:31:15.975Z"}}