{"id":"de14722d-66c1-47f7-a98e-a7c96bf3895c","shortId":"wWJkNr","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, no rate limits, and no sign-up required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/135` 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 equates to $0.02 per call, consistent with the site's uniform pricing. Payment is made via the x402 \"exact\" scheme with a 300-second timeout.\n\nThe platform advertises categories including 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, the crawled documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented.","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-apis"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no usable content — only a 'Connect wallet' prompt","No OpenAPI or schema available; request/response formats are unknown","The specific endpoint '/api/v1/transfers/135' has a generic description ('Premium API Access') with no indication of what it actually returns","The wide range of advertised capabilities (AI, analytics, finance, geocoding) cannot be verified from available crawl data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/135","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/transfers/135","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 with clear pricing. However, documentation pages are empty (just 'Connect wallet'), there is no OpenAPI schema, no example requests or responses, and the actual functionality behind '/api/v1/transfers/135' is unclear beyond the generic 'Premium API Access' label. The broad claims about AI, analytics, and finance endpoints cannot be verified from the 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'/request':13,28 '0.02':12,27,64,132 '000':115 '0x8335':120 '20':114 '2913':121 '300':152 '402':109 '6':127 'access':105 'actual':213 'advertis':157 'ai':167 'ai-inference' 'ai/ml':49 'analysi':171 'analyt':48,161 'api':5,20,37,74,104 'attach':87 'base':8,23,71,116,123 'base network api' 'behavior':214 'broad':42 'call':4,19,134 'caller':85 'categori':158 'challeng':110 'classif':174 'classification' 'connect':204 'consist':135 'content':210 'convers':190 'crawl':194 'crypto-quotes' 'data':47,52,160,164 'data-analytics' 'decim':128 'doc':197 'document':195 'embed':175 'embeddings' 'enabl':36 'endpoint':45,57,97,220 'equat':130 'estim':185 'exact':148 'exchang':180 'export':165 'feed':179 'financ':176 'finance-data' 'finance/web3':51 'gas':184 'generat':191 'geocod':188 'geocoding' 'header':91 'howev':192 'includ':159 'infer':50 'infrastructur':54,187 'insight':166 'key':75 'learn':169 'limit':78 'list':101 'low payment fee' 'lowpaymentfee.com':31 'machin':168 'made':144 'metric':162 'micropayment api' 'network':9,24,72 'no-auth api' 'offer':40 'page':196 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':90,142 'per':3,18,61,133 'platform':6,21,38,156 'premium':103 'price':141,178,198 'prompt':206 'quot':183 'rate':77,181 'readm':199 'remain':221 'report':163 'request':62,94,111 'requir':84 'respons':216 'return':107,201 'schema':217 'scheme':149 'second':153 'sentiment':170 'sentiment-analysis' 'set':43 'settl':66 'sign':82 'sign-up':81 'simpli':86 'sinc':124 'site':138 'span':46 'specif':96 'substant':209 'summar':173 'text':172 'text-summarization' 'timeout':154 'token':182 'undocu':222 'uniform':140 'unit':117 'usdc':15,30,68,119,125 'usdc api' 'usdc-base' 'use':126 'util':55 'utility-apis' 'valid':189 'via':10,25,145 'wallet':205 'web3':177 'x402':11,26,35,89,147 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"81c1cba2-790d-433e-81af-11405ecf6193","listingId":"de14722d-66c1-47f7-a98e-a7c96bf3895c","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/transfers/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:28.238Z"}],"sources":[{"listingId":"de14722d-66c1-47f7-a98e-a7c96bf3895c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:28.238Z","lastSeenAt":"2026-04-22T09:01:47.841Z"}],"details":{"listingId":"de14722d-66c1-47f7-a98e-a7c96bf3895c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/135 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transfers/135"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/135"}],"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 micropayments","Geocoding or data validation as a utility service paid per request via x402","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 API usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, response schemas, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.938Z"},"updatedAt":"2026-04-22T09:01:47.841Z"}}