{"id":"42d3556c-2393-4c63-8e32-a663c743a9fc","shortId":"vhngAj","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set of 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint probed (`/api/v1/messages/192`) is described as \"Premium API Access\" and returned a live 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the actual behavior of `/api/v1/messages/192` (and most other endpoints) is unclear; the \"Premium API Access\" label is generic and does not describe what data or functionality is returned.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation, request schemas, or response examples are available for any endpoint.","The specific endpoint /api/v1/messages/192 is labeled only 'Premium API Access' with no description of what it actually does.","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content.","Cannot verify what data or functionality any endpoint actually returns without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/192","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the purpose of /api/v1/messages/192 is entirely opaque. The landing page lists many endpoints but provides no detail on any of 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'/api/v1/messages/192':123,220 '/pricing':198 '/readme':200 '/request':19,38 '0.02':18,37,95,145 '000':140 '20':139 '402':134 '6':150 'accept':169 'access':129,230 'across':54 'actual':217 'addit':211 'address':166 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,128,229 'application/json':174 'avail':182 'base':8,27,103,141,153 'base network api' 'behavior':218 'broad':50 'call':4,23 'categori':56 'challeng':135 'classif':71 'classification' 'commit':118 'connect':206 'content':212 'convers':88 'conversion' 'cover':10,29 'crypto-quotes' 'data':11,30,57,61,239 'data-analytics' 'decim':151 'describ':125,237 'descript':192 'document':175 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,168,183,224 'estim':82 'exact':160 'exampl':195 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':241 'gas':81 'gas-estimates' 'generat':89 'generic':233 'geocod':86 'geocoding' 'http':170 'infrastructur':84 'insight':63 'key':111 'label':231 'land':179 'learn':66 'limit':114 'list':181 'live':133 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':156 'marketplac':46 'metric':59 'micropayment api' 'minim':177 'network':104 'page':180,201 'paid':98 'paramet':191 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':154 'payto':165 'per':3,22,96 'platform':6,25 'post':171 'premium':127,228 'price':75,93,185 'probe':122 'prompt':208 'protocol':108 'provid':187 'quot':80 'rate':78,113 'report':60 'request':97,136 'request/response':189 'resolv':203 'return':131,173,243 'schema':190 'scheme':161 'sentiment':67 'sentiment-analysis' 'set':51 'sinc':147 'specif':120 'specifi':164 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':226 'unit':142 'upfront':117 'usag':194 'usd':146 'usdc':9,28,100,144,148 'usdc api' 'usdc-base' 'use':149 'util':15,34,85 'valid':87 'validation' 'via':105,157 'wallet':207 'web3':74 'x402':43,107,159 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"98c016e8-ad38-4216-aabe-e92c811ebd3a","listingId":"42d3556c-2393-4c63-8e32-a663c743a9fc","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.644Z"}],"sources":[{"listingId":"42d3556c-2393-4c63-8e32-a663c743a9fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/192","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.644Z","lastSeenAt":"2026-04-22T02:32:07.411Z"}],"details":{"listingId":"42d3556c-2393-4c63-8e32-a663c743a9fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/192 \\\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 are 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":"The 402 challenge for /api/v1/messages/192 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/messages/192"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","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 or gas estimates via a single paid HTTP call","Geocoding or data validation as a utility microservice with no subscription overhead"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that can settle USDC micropayments on Base"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.668Z"},"updatedAt":"2026-04-22T02:32:07.411Z"}}