{"id":"c2b4defd-9ba3-40c2-8ac9-f2410b6ed2fa","shortId":"RmVerF","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 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, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transactions/258` 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. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST 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, /api, and /README but all 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","per-request-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no actual content","No OpenAPI or schema available — request and response formats for this endpoint are unknown","The endpoint path '/api/v1/transactions/258' with description 'Premium API Access' is vague; its specific functionality is unclear","Cannot verify what data or service this specific endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/258","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/258","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation pages are empty (all show only 'Connect wallet'), there is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/transactions/258 ('Premium API Access') is vague and undifferentiated from the other $0.02 endpoints. This is effectively a stub 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'/api/v1/transactions/258':92 '/docs':190 '/pricing':191 '/readme':194 '/request':13,28 '0.02':12,27,74,119 '000':108 '0x8335':113 '20':107 '2913':114 '300':135 '402':102 '402 payment api' '6':123 'accept':140 'access':98 'actual':210 'advertis':149 'ai':161 'ai-inference' 'ai/ml':49 'analysi':165 'analyt':48,155 'api':5,20,37,79,97 'application/json':145 'base':8,23,67,109,116 'base network api' 'broad':42 'broader':147 'call':4,19,76 'categori':153 'challeng':103 'classif':168 'classification' 'collect':43 'commit':86 'connect':201 'content':207 'convers':184 'crypto-data' 'current':197 'data':47,52,154,158 'data-analytics' 'decim':124 'document':186 'embed':169 'embeddings' 'enabl':36 'endpoint':45,57,90,139,150,215 'equal':118 'estim':179 'exact':131 'exchang':174 'exist':188 'export':159 'feed':173 'financ':170 'finance-data' 'finance/web3':51 'flat':71 'four':152 'gas':178 'generat':185 'geocod':182 'geocoding' 'given':120 'http':141 'individu':214 'infer':50 'infrastructur':181 'insight':160 'key':80 'learn':163 'limit':83 'list':94 'low payment fee' 'lowpaymentfee.com':31 'machin':162 'made':127 'metric':156 'micropayment api' 'network':9,24,68 'offer':40 'page':187 'paid':59 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'payment':125 'per':3,18,61,75 'per-request':60 'per-request-pricing' 'platform':6,21,38,148 'post':142 'premium':96 'price':172 'prompt':203 'quot':177 'rate':72,82,175 'render':198 'report':157 'request':62,104 'request/response':211 'requir':87 'return':100,144 'schema':212 'scheme':132 'second':136 'sentiment':164 'sentiment-analysis' 'servic':55 'span':46 'specif':89 'substant':206 'summar':167 'text':166 'text-summarization' 'timeout':137 'token':176 'unit':110 'unknown':217 'usdc':15,30,64,112,121 'usdc api' 'usdc-base' 'use':63 'util':54 'utility-services' 'valid':183 'via':10,25,128 'wallet':202 'web3':171 'x402':11,26,35,130 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"8c04851d-d0ac-4b35-bbd1-87c3a9a9f7b8","listingId":"c2b4defd-9ba3-40c2-8ac9-f2410b6ed2fa","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/258","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:36.020Z"}],"sources":[{"listingId":"c2b4defd-9ba3-40c2-8ac9-f2410b6ed2fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/258","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:36.020Z","lastSeenAt":"2026-04-22T11:32:21.802Z"}],"details":{"listingId":"c2b4defd-9ba3-40c2-8ac9-f2410b6ed2fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/258 \\\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 offers endpoints at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/258"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment","Running geocoding or data validation tasks with no subscription commitment","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-use access to diverse API endpoints","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation and well-defined request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.786Z"},"updatedAt":"2026-04-22T11:32:21.802Z"}}