{"id":"8eeda863-03ab-4ca4-a6dc-a9bcf721063f","shortId":"UgyyGm","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and general-purpose utilities. All endpoints are paid per request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/transactions/26` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via an x402 exact-scheme challenge: the caller includes an X-PAYMENT header with a signed USDC transfer to the provider's address on Base. The endpoint accepts POST requests and returns JSON.\n\nThe broader platform advertises additional 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). All are priced at $0.02 per request. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["data","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint","crypto paid api"],"warnings":["The specific endpoint /api/v1/transactions/26 is not listed among the site's advertised API catalog; its actual functionality is unknown.","Documentation, pricing, and README pages all render only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available — request/response formats must be guessed.","The description 'Premium API Access' is generic and does not clarify what data or service this endpoint provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/26","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/26","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages all resolve to a 'Connect wallet' stub with no usable content. The specific purpose of '/api/v1/transactions/26' labeled 'Premium API Access' is unclear — it doesn't appear in the site's listed catalog, making its actual functionality 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'/request':19,38 '0.02':18,37,106,201 '000':110 '20':109 '6':116 'accept':150 'access':103 'across':162 'addit':160 'address':145 'advertis':159 'ai':12,31,172 'ai-inference' 'ai/ml':57 'analysi':176 'analyt':56,166 'api':5,24,45,84,102 'appear':208 'avail':222 'base':8,27,77,111,147 'base network api' 'broad':50 'broader':157 'call':4,23,108 'caller':129 'catalog':51 'categori':164 'challeng':127 'classif':179 'classification' 'connect':213 'convers':195 'cost':105 'crawl':225 'crypto paid api' 'crypto-quotes' 'data':11,30,55,61,165,169 'data-analytics' 'decim':117 'detail':217 'document':204 'embed':180 'embeddings' 'enabl':44 'endpoint':16,35,53,68,95,149,161 'estim':190 'exact':125 'exact-schem':124 'exchang':185 'exist':206 'export':170 'feed':184 'financ':13,32,181 'finance-data' 'finance/web3':59 'four':163 'gas':189 'general':64 'general-purpos':63 'generat':196 'geocod':193 'geocoding' 'header':135 'includ':130 'infer':58 'infrastructur':192 'insight':171 'json':155 'key':85 'learn':174 'limit':88 'list':99 'low payment fee' 'lowpaymentfee.com':39 'machin':173 'made':120 'market':60 'metric':167 'micropayment api' 'network':78 'no-api-key endpoint' 'offer':10,29 'page':205 'paid':70 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'payment':118,134 'per':3,22,71,107,202 'per-request-pricing' 'platform':6,25,46,158 'post':151 'premium':101 'price':183,199 'protocol':82 'provid':48,143 'purpos':65 'quot':188 'rate':87,186 'report':168 'request':72,152,203 'request/response':218 'requir':92,210 'return':154 'schema':219 'scheme':126 'sentiment':175 'sentiment-analysis' 'sign':138 'span':54 'specif':94 'subscript':91 'summar':178 'text':177 'text-summarization' 'token':187 'transfer':140 'unit':112 'usdc':9,28,74,114,139 'usdc api' 'usdc-base' 'use':73 'util':15,34,66 'utility-apis' 'valid':194 'via':79,121 'view':215 'wallet':212 'web3':182 'x':133 'x-payment':132 'x402':43,81,123 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f74a8a92-14ea-4bcb-8573-50319a511ec9","listingId":"8eeda863-03ab-4ca4-a6dc-a9bcf721063f","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:46.934Z"}],"sources":[{"listingId":"8eeda863-03ab-4ca4-a6dc-a9bcf721063f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:46.934Z","lastSeenAt":"2026-04-22T20:01:38.924Z"}],"details":{"listingId":"8eeda863-03ab-4ca4-a6dc-a9bcf721063f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/26 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/26 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/26"},{"claim":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/26"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes and gas estimates for DeFi workflows","Running geocoding or data validation as part of an automated pipeline with per-call billing","Exporting analytics data or generating reports via a simple paid HTTP call"],"bestFor":["AI agents and bots that can pay per request with USDC on Base","Developers who want instant API access without signup or rate limits","Low-volume or bursty workloads where flat per-call pricing is cost-effective"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, uptime guarantees, or dedicated support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.242Z"},"updatedAt":"2026-04-22T20:01:38.924Z"}}