{"id":"c0b29b7b-97a6-4926-84a2-aa4fb020b06a","shortId":"58PZmZ","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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/140` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment timeout is 300 seconds.\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 wallet connection and contain no substantive content in the crawl. No OpenAPI schema, request/response examples, or detailed endpoint documentation was found.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/140 is unclear; 'Premium API Access' is a generic label","No request body schema or response examples are documented anywhere in the crawl","The platform lists many endpoint categories but none could be verified for actual functionality beyond returning 402 challenges"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/140","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/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty (wallet-gated). The specific purpose of the /api/v1/transactions/140 endpoint beyond 'Premium API Access' is unknown. This is effectively a stub 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'/request':13,28 '0.02':12,27,64,121 '000':110 '0x8335':115 '20':109 '2913':116 '300':145 '6':125 'accept':135 'access':102 'account':76 'across':152 'advertis':104,150 'ai':162 'ai-inference' 'ai/ml':49 'amount':107 'analysi':166 'analyt':48,156 'api':5,20,37,74,101 'appear':191 'application/json':140 'attach':84 'base':8,23,71,111,118 'base network api' 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':154 'challeng':129 'classif':169 'classification' 'confirm':130 'connect':195 'contain':197 'content':200 'convers':185 'crawl':203 'crypto-quotes' 'data':47,52,155,159 'data-analytics' 'decim':126 'detail':210 'document':187,212 'embed':170 'embeddings' 'enabl':36 'endpoint':45,57,94,132,151,211 'equal':120 'estim':180 'exampl':208 'exchang':175 'exist':189 'export':160 'feed':174 'financ':171 'finance-data' 'finance/web3':51 'found':214 'four':153 'gas':179 'generat':186 'geocod':183 'geocoding' 'given':122 'header':88 'infer':50 'infrastructur':182 'insight':161 'key':75 'learn':164 'limit':79 'list':98 'live':134 'low payment fee' 'lowpaymentfee.com':31 'machin':163 'max':106 'metric':157 'micropayment api' 'network':9,24,72 'no-auth api' 'offer':40 'openapi':205 'page':188 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,142 'per':3,18,61 'platform':6,21,38,149 'post':136 'premium':100 'price':173 'quot':178 'rate':78,176 'report':158 'request':62,91,137 'request/response':207 'requir':81,193 'return':139 'schema':206 'second':146 'sentiment':165 'sentiment-analysis' 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93 'substant':199 'summar':168 'text':167 'text-summarization' 'timeout':143 'token':177 'unit':112 'usdc':15,30,68,114,123 'usdc api' 'usdc-base-network' 'util':54 'utility-services' 'valid':184 'via':10,25 'wallet':194 'web3':172 'x402':11,26,35,86,128 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"45ca6b7d-bf22-4d4d-ab7c-e9b9d98c78c6","listingId":"c0b29b7b-97a6-4926-84a2-aa4fb020b06a","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/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:36.986Z"}],"sources":[{"listingId":"c0b29b7b-97a6-4926-84a2-aa4fb020b06a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/140","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:36.986Z","lastSeenAt":"2026-04-22T13:31:45.367Z"}],"details":{"listingId":"c0b29b7b-97a6-4926-84a2-aa4fb020b06a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/140 \\\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 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/140"},{"claim":"Platform offers 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 token quotes, gas estimates, or exchange rates via micropayment","Running geocoding or data validation as a utility service with per-call billing","Exporting analytics data or generating insights reports on demand"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-commitment, no-signup API access","Web3-native applications already operating on Base network with USDC"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.618Z"},"updatedAt":"2026-04-22T13:31:45.367Z"}}