{"id":"b1708ff9-1f65-42a3-afb3-bad640fc0e89","shortId":"pZaEAz","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","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 general infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/5` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it may be a messaging or content-retrieval endpoint. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02) per call, settling to address 0x1A2B…85F3 on Base.\n\nThe broader platform advertises four endpoint categories: Data & Analytics (metrics, reports, 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 share the same $0.02 flat pricing. No OpenAPI schema, detailed request/response documentation, or usage examples were found during crawling.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","analytics-metrics","finance-price-feeds","exchange-rates","gas-estimates","geocoding","data-export"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","sentiment analysis API","text summarization API","crypto price feed"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact purpose and expected input/output of /api/v1/messages/5 is unknown — 'Premium API Access' is a generic label","Crawled /api, /pricing, and /README pages returned no meaningful content","No rate-limit or SLA information provided","Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/5","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/messages/5","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 documentation, no examples, and the specific purpose of /api/v1/messages/5 is undocumented. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':18,36 '0.02':17,35,68,163,215 '000':157 '0x1a2b':169 '20':156 '85f3':170 'Base network API' 'USDC API' 'accept':149 'access':114 'address':168 'advertis':176 'ai':11,29,186 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':190 'analyt':12,30,54,181 'analytics-metrics' 'api':5,23,43,85,113 'attach':96 'base':8,26,76,158,172 'beyond':128 'broad':48 'broader':174 'call':4,22,165 'caller':94 'categori':179 'challeng':144 'classif':193 'collect':49 'commit':93 'confirm':145 'content':139 'content-retriev':138 'convers':209 'cover':10,28 'crawl':230 'crypto price feed' 'data':53,58,180 'data-export' 'detail':221 'document':127,223 'embed':194 'enabl':42 'endpoint':51,64,106,141,178 'estim':204 'everi':63 'exact':123 'exampl':226 'exchang':199 'exchange-rates' 'export':184 'feed':198 'financ':13,31,195 'finance-price-feeds' 'finance/web3':57 'flat':216 'follow':116 'found':228 'four':177 'function':124 'gas':203 'gas-estimates' 'general':60 'generat':210 'generic':130 'geocod':207 'geocoding' 'header':100 'i.e':162 'infer':56 'infrastructur':61,206 'insight':185 'key':86 'learn':188 'limit':89 'list':110 'live':148 'low payment fee' 'lowpaymentfee.com':37 'machin':187 'may':133 'messag':136 'metric':182 'micropayment API' 'network':77 'offer':46 'openapi':219 'paid':71 'pattern':121 'pay':2,20 'pay per call API' 'pay-per-cal':1,19 'pay-per-request' 'payment':99,120 'per':3,21,69,164 'platform':44,175 'post':150 'premium':112 'price':66,197,217 'protocol':81 'quot':202 'rate':88,200 'report':183 'request':70,103,151 'request/response':222 'requir':153 'retriev':140 'schema':220 'sentiment':189 'sentiment analysis API' 'settl':166 'share':212 'simpli':95 'span':52 'specif':105 'suit':6,24 'summar':192 'text':191 'text summarization API' 'titl':131 'token':201 'unit':159 'upfront':92 'usag':225 'usdc':9,27,73,161 'usdc-base' 'util':15,33,62 'valid':208 'via':78 'web3':196 'x402':41,80,98,119,143 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"fe3c5fe4-66cd-4e81-ac6a-8b0c6c81f64d","listingId":"b1708ff9-1f65-42a3-afb3-bad640fc0e89","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/messages/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.259Z"}],"sources":[{"listingId":"b1708ff9-1f65-42a3-afb3-bad640fc0e89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.259Z","lastSeenAt":"2026-04-22T02:32:08.339Z"}],"details":{"listingId":"b1708ff9-1f65-42a3-afb3-bad640fc0e89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/5 \\\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":"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 (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/5"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Running sentiment analysis or text classification without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates on demand","Geocoding addresses or validating data with per-call billing","Exporting analytics data or generating reports with zero upfront cost","Embedding text for search or recommendation pipelines"],"bestFor":["Agents or bots that need on-demand API access without credential management","Developers prototyping across multiple API categories at minimal cost","Crypto-native applications that can pay per call in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.711Z"},"updatedAt":"2026-04-22T02:32:08.339Z"}}