{"id":"c295aba6-7b85-4c36-a6f3-6232a270b2fb","shortId":"BR5Vnv","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 probed (`/api/v1/messages/40`) is labeled \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The broader site advertises 16+ endpoints organized into four 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/Utilities (geocoding, validation, conversion, generation).\n\nDocumentation is minimal — the landing page lists endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. Without schemas or sample payloads, it is unclear what request bodies each endpoint expects or what response formats they return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","analytics","data-export","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","ai inference api","analytics api"],"warnings":["No API documentation, request schemas, or response examples are available anywhere on the site.","The endpoint path /api/v1/messages/40 is not listed among the 16 advertised endpoints on the landing page — its actual functionality is unknown.","All non-root pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.","Without documented schemas, callers cannot know what request body to send or what response to expect."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/40","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/40","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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no usage examples, and the docs pages are empty beyond a wallet-connect prompt. The endpoint path '/api/v1/messages/40' gives no indication of what it actually does beyond the generic label 'Premium API Access'. Effectively a stub 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'/api/v1/messages/40':104 '/pricing':192 '/readme':194 '/request':18,36 '0.02':17,35,67,126 '000':120 '16':133 '20':119 '402':114 'access':109 'addit':206 'advertis':132 'ai':11,29,145 'ai inference api' 'ai/ml':55 'analysi':149 'analyt':12,30,54,140 'analytics' 'analytics api' 'api':5,23,43,80,108 'attach':92 'bare':200 'base':8,26,75,121,128 'base network api' 'bodi':218 'broad':48 'broader':130 'call':4,22 'caller':90 'categori':138 'challeng':115 'classif':152 'collect':49 'connect':201 'content':207 'convers':168 'conversion' 'cover':10,28 'data':53,58,139 'data-export' 'descript':186 'document':170 'embed':153 'embeddings' 'enabl':42 'endpoint':51,63,102,134,177,220 'estim':163 'everi':62 'exampl':189 'exchang':158 'exchange-rates' 'expect':221 'export':143 'feed':157 'financ':13,31,154 'finance/web3':57 'format':225 'four':137 'gas':162 'gas-estimates' 'general':60 'generat':169 'geocod':166 'geocoding' 'header':96 'i.e':125 'infer':56 'infrastructure/utilities':165 'insight':144 'key':81 'label':106 'land':174 'learn':147 'limit':84 'list':176 'low payment fee' 'lowpaymentfee.com':37 'machin':146 'metric':141 'micropayment api' 'minim':172 'network':76 'offer':46 'organ':135 'page':175,195 'paramet':185 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payload':212 'payment':95 'per':3,21,68 'platform':44 'premium':107 'price':65,156,179 'price-feeds' 'probe':103 'prompt':203 'provid':181 'quot':161 'rate':83,159 'report':142 'request':69,99,116,217 'request/response':183 'resolv':197 'respons':224 'return':111,227 'sampl':211 'schema':184,209 'sentiment':148 'sentiment-analysis' 'settl':70 'sign':88 'sign-up':87 'simpli':91 'site':131 'span':52 'specif':101 'suit':6,24 'summar':151 'text':150 'text-classification' 'text-summarization' 'token':160 'unclear':215 'unit':122 'usag':188 'usdc':9,27,72,124 'usdc api' 'usdc-base' 'util':15,33,61 'valid':113,167 'validation' 'wallet':202 'web3':155 'without':208 'x402':41,94 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"d3792bda-af9a-4348-bd48-3441edf1287c","listingId":"c295aba6-7b85-4c36-a6f3-6232a270b2fb","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.703Z"}],"sources":[{"listingId":"c295aba6-7b85-4c36-a6f3-6232a270b2fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.703Z","lastSeenAt":"2026-04-22T02:32:07.580Z"}],"details":{"listingId":"c295aba6-7b85-4c36-a6f3-6232a270b2fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/40 \\\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":"The site advertises 16+ endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/messages/40 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/messages/40"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes or gas estimates via a single paid HTTP call","Geocoding addresses or validating data on-demand with per-request USDC micropayments","Exporting analytics metrics or generating reports with zero upfront commitment"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with multiple utility endpoints at low cost","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on Base or unfamiliar with x402 payment flows","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.653Z"},"updatedAt":"2026-04-22T02:32:07.580Z"}}