{"id":"4b55d805-38be-4b11-9f86-76f4f5545727","shortId":"A2BqM3","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 utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/63` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found during the crawl; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","analytics","finance-data","crypto-quotes","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","no-auth api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/63 has no description beyond 'Premium API Access' — its actual function is unknown","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","No request or response examples could be found or inferred","The platform lists many endpoints on its homepage but none have detailed docs; actual functionality is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/63","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/63","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), but there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the /api, /pricing, and /README pages are all blank beyond a wallet-connect prompt. The purpose of the specific /messages/63 endpoint is unclear. This is effectively a stub 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'/api/v1/messages/63':104 '/pricing':203 '/readme':205 '/request':18,36 '0.02':17,35,67,135,184 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':129 '20':123 '2913':130 '300':150 '6':139 'accept':112 'access':110 'addit':157 'address':146 'advertis':118,156 'ai':11,29 'ai-inference' 'ai/ml':55 'analysi':161 'analyt':12,30,54 'analytics' 'api':5,23,43,80,109 'attach':92 'base':8,26,75,125,132 'base network api' 'broad':48 'broader':154 'call':4,22 'caller':90 'challeng':117 'classif':164 'classification' 'collect':49 'connect':211 'content':217 'convers':176 'cost':121 'cover':10,28 'crawl':200 'crypto-quotes' 'data':53,58,178 'data-export' 'decim':140 'detail':194 'document':195 'embed':165 'embeddings' 'enabl':42 'endpoint':51,63,102,158 'equal':134 'estim':173 'everi':62 'exampl':192 'exchang':168 'feed':167 'financ':13,31 'finance-data' 'finance/web3':57 'found':197 'gas':172 'gas-estimates' 'general':60 'generat':179 'geocod':174 'geocoding' 'given':136 'header':96 'howev':187 'includ':159 'infer':56 'key':81 'limit':84 'list':106 'low payment fee' 'lowpaymentfee.com':37 'maximum':120 'micropayment api' 'network':76 'no-auth api' 'offer':46 'openapi':189 'page':206 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':95,142 'per':3,21,68 'platform':44,155 'point':186 'post':113 'premium':108 'price':65,166,185 'prompt':213 'quot':171 'rate':83,169 'request':69,99,114 'request/response':191 'return':208 'schema':190 'second':151 'sent':144 'sentiment':160 'sentiment-analysis' 'settl':70 'sign':88 'sign-up':87 'simpli':91 'span':52 'specif':101 'substant':216 'suit':6,24 'summar':163 'text':162 'text-summarization' 'timeout':152 'token':170 'unit':126 'usdc':9,27,72,128,137 'usdc api' 'usdc-base' 'util':15,33,61 'valid':175 'wallet':212 'x402':41,94,116 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"a6375cb8-8581-430b-a444-6ea20e5dfede","listingId":"4b55d805-38be-4b11-9f86-76f4f5545727","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.326Z"}],"sources":[{"listingId":"4b55d805-38be-4b11-9f86-76f4f5545727","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.326Z","lastSeenAt":"2026-04-22T02:32:08.412Z"}],"details":{"listingId":"4b55d805-38be-4b11-9f86-76f4f5545727","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/63 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/63"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes and gas estimates via a single micropayment","Running geocoding or data validation calls from automated pipelines with no subscription commitment","Exporting analytics reports or insights on a per-request billing basis"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.709Z"},"updatedAt":"2026-04-22T02:32:08.412Z"}}