{"id":"da9fa2b5-bcaa-43fa-ab17-0703336c3fe9","shortId":"26jH56","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-enabled API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. The specific endpoint at `/api/v1/messages/134` is listed as \"Premium API Access\" and follows the same x402 payment pattern.\n\nThe platform advertises four endpoint 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 endpoints accept POST requests and return JSON.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing, but no detailed API reference, request/response schemas, or usage examples are provided. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. The specific purpose of the `/api/v1/messages/134` endpoint is unclear beyond its \"Premium API Access\" label, as it does not correspond to any of the named endpoints on the landing page.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","validation","conversion"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","analytics API","AI inference API"],"warnings":["No API documentation or schema available for any endpoint","The /api/v1/messages/134 path does not match any named endpoint on the landing page — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/134","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/134","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 per request in USDC on Base). However, there is no API documentation, no request/response schemas, no examples, and the specific /api/v1/messages/134 endpoint's purpose is unexplained. The /api, /pricing, and /README pages are empty beyond a wallet prompt. This is effectively a stub 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'/api/v1/messages/134':87,192 '/pricing':172 '/readme':174 '/request':18,36 '0.02':17,35,63 'AI inference API' 'Base network API' 'USDC API' 'accept':141 'access':93,200 'addit':185 'advertis':103 'ai':12,30,114 'ai-inference' 'ai/ml':50 'analysi':118 'analyt':11,29,49,108 'analytics API' 'api':5,23,45,75,92,161,199 'avail':154 'base':8,26,71 'beyond':196 'call':4,22 'categori':106 'classif':121 'classification' 'collect':40 'commit':81 'connect':180 'content':186 'convers':137 'conversion' 'correspond':206 'cover':10,28 'crypto-data' 'data':48,53,107,111 'data-analytics' 'detail':160 'document':147 'embed':122 'embeddings' 'enabl':44 'endpoint':46,59,85,105,140,155,193,212 'estim':132 'everi':58 'exampl':167 'exchang':127 'export':112 'feed':126 'financ':13,31,123 'finance-data' 'finance/web3':52 'follow':95 'four':104 'gas':131 'general':55 'generat':138 'geocod':135 'geocoding' 'host':38 'infer':51 'infrastructur':56,134 'insight':113 'json':146 'key':76 'label':201 'land':151,215 'learn':116 'limit':78 'list':89,153 'low payment fee API' 'lowpaymentfee.com':37 'machin':115 'metric':109 'micropayment API' 'minim':149 'name':211 'network':72 'page':152,175,216 'pattern':100 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':99 'per':3,21,64 'platform':102 'post':142 'premium':91,198 'price':61,125,157 'prompt':182 'provid':169 'purpos':189 'quot':130 'rate':77,128 'refer':162 'report':110 'request':65,143 'request/response':163 'requir':82 'resolv':177 'return':145 'schema':164 'sentiment':117 'sentiment-analysis' 'settl':66 'span':47 'specif':84,188 'suit':6,24 'summar':120 'text':119 'text-summarization' 'token':129 'unclear':195 'upfront':80 'usag':166 'usdc':9,27,68 'usdc-base' 'util':15,33,57 'valid':136 'validation' 'wallet':181 'web3':124 'x402':43,98 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0df8b9b5-f7ad-423d-9b91-bf94870f0f48","listingId":"da9fa2b5-bcaa-43fa-ab17-0703336c3fe9","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/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.327Z"}],"sources":[{"listingId":"da9fa2b5-bcaa-43fa-ab17-0703336c3fe9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.327Z","lastSeenAt":"2026-04-22T05:32:16.229Z"}],"details":{"listingId":"da9fa2b5-bcaa-43fa-ab17-0703336c3fe9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/134 \\\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":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/134 returns maxAmountRequired of 20000 base units (= $0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/messages/134"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/134"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates via a single paid request","Geocoding or data validation as a lightweight utility call from an agent workflow","Exporting analytics data or generating insights on demand"],"bestFor":["Agents that need low-friction, keyless API access with crypto micropayments","Developers prototyping with multiple API categories at uniform pricing","Use cases requiring small, infrequent API calls where $0.02/request is economical"],"notFor":["High-volume production workloads where per-request costs would accumulate quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-network USDC wallet or x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.229Z"},"updatedAt":"2026-04-22T05:32:16.229Z"}}