{"id":"397ee7d4-d6bc-4929-8baa-6272c3210d80","shortId":"jCEcDt","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad set of endpoints across 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). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/195` is listed as \"Premium API Access\" and its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. The purpose of the `/api/v1/messages/195` path specifically is unclear — it may be a generic message retrieval or content endpoint, but no schema or description beyond \"Premium API Access\" is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific path /api/v1/messages/195 has no documented purpose beyond 'Premium API Access'","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","No example requests or responses are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/195","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/195","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 OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/195 is unexplained. Effectively a stub 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'/api/v1/messages/195':112,220 '/pricing':200 '/readme':202 '/request':19,38 '0.02':18,37,94,136 '000':128 '0x8335':133 '20':127 '402':121 '402 payment api' '6':140 'access':118,243 'across':54 'addit':214 'advertis':123 'ai':12,31,63 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':67 'analyt':58 'api':5,24,45,117,152,242 'attach':163 'avail':180 'bare':208 'base':8,27,102,129 'base network api' 'beyond':240 'broad':50 'call':4,23 'caller':161 'categori':56 'challeng':122 'classif':70 'connect':209 'content':215,233 'convers':87 'conversion' 'crypto-gas' 'data':11,30,57 'data-analytics' 'decim':141 'descript':239 'document':173,193 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,181,234 'equal':135 'estim':81 'exact':148 'exampl':197 'exchang':76 'exchange-rates' 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-prices' 'four':55 'gas':80 'generat':88 'generic':229 'geocod':85 'geocoding' 'given':137 'header':168 'infrastructur':83 'insight':62 'key':153 'land':177 'learn':65 'limit':156 'list':114,179 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':144 'maxamountrequir':125 'may':226 'messag':230 'metric':59 'micropayment api' 'minim':175 'network':103 'offer':10,29 'openapi':188 'page':178,203 'path':221 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':142,167 'per':3,22,95 'platform':6,25,46 'post':171 'premium':116,241 'price':74,92,183 'prompt':211 'protocol':107 'provid':245 'purpos':217 'quot':79 'rate':77,155 'report':60 'request':96,172 'request/response':191 'requir':160 'resolv':205 'retriev':231 'schema':192,237 'scheme':149 'sentiment':66 'set':51 'settl':97 'simpli':162 'spec':189 'specif':109,222 'subscript':159 'summar':69 'text':68 'token':78 'unclear':224 'unit':130 'usag':196 'usdc':9,28,99,132,138 'usdc api' 'usdc-base' 'util':15,34,84 'valid':86 'validation' 'via':104,145 'wallet':210 'web3':73 'x':166 'x-payment':165 'x402':43,106,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f6eb1610-eab9-4c03-8ae3-c8e11a1527ca","listingId":"397ee7d4-d6bc-4929-8baa-6272c3210d80","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/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.860Z"}],"sources":[{"listingId":"397ee7d4-d6bc-4929-8baa-6272c3210d80","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/195","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.860Z","lastSeenAt":"2026-04-22T02:32:07.885Z"}],"details":{"listingId":"397ee7d4-d6bc-4929-8baa-6272c3210d80","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/195 \\\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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/messages/195 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/195"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-request basis","Running utility tasks like geocoding, data validation, or format conversion with instant crypto-settled access"],"bestFor":["Agents or bots that need keyless, pay-per-call API access settled on Base","Developers prototyping with low-cost AI and data endpoints without subscription commitments","Web3-native applications that prefer on-chain USDC micropayments over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up and bulk pricing is needed","Users who require detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.408Z"},"updatedAt":"2026-04-22T02:32:07.885Z"}}