{"id":"12d7c661-75d6-4d93-b6bc-60528110b07c","shortId":"d35rtW","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 catalog 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/13` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02. The endpoint accepts HTTP POST requests and returns application/json. No API keys or rate limits are advertised; access is gated entirely by the x402 payment header.\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/13` endpoint specifically is unclear; it may be a messaging or content retrieval endpoint, but this is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","conversion"],"categories":["llm","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/13 ('Premium API Access') is undocumented — it is unclear what data or service it provides","All secondary pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No request body or response body schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/13","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/13","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 challenge, and the landing page confirms pricing and available categories. However, there is no OpenAPI spec, no request/response schema, no documentation for the specific /messages/13 endpoint, and no usage examples. The purpose of this particular endpoint is 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'/api/v1/messages/13':113,215 '/pricing':195 '/readme':197 '/request':19,38 '0.02':18,37,95,141 '000':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':134 '20':127 '6':137 'accept':144 'access':119,159 'across':54 'addit':209 'advertis':123,158 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,118,152 'application/json':150 'asset':133 'avail':175 'bare':203 'base':8,27,103,129 'base network api' 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':122 'classif':71 'classification' 'connect':204 'content':210,226 'convers':88 'conversion' 'data':11,30,57,61 'data-analytics' 'decim':138 'document':168,188,233 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,143,176,216,228 'entir':162 'equat':139 'estim':82 'exampl':192 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'gate':161 'generat':89 'geocod':86 'geocoding' 'header':167 'http':145 'infrastructur':84 'insight':63 'key':153 'land':172 'learn':66 'limit':156 'list':115,174 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'maxamountrequir':125 'may':221 'messag':224 'metric':59 'micropayment api' 'minim':170 'network':104 'offer':10,29 'openapi':183 'page':173,198 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':166 'per':3,22,96 'platform':6,25,46 'post':146 'premium':117 'price':75,93,178 'prompt':206 'protocol':108 'purpos':212 'quot':80 'rate':78,155 'report':60 'request':97,147 'request/response':186 'resolv':200 'retriev':227 'return':149 'schema':187 'sentiment':67 'sentiment-analysis' 'settl':98 'spec':184 'specif':110,217 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':219 'unit':130 'usag':191 'usdc':9,28,100,132 'usdc api' 'usdc-base' 'use':136 'util':15,34,85 'valid':87 'validation' 'via':105 'wallet':205 'web3':74 'x402':43,107,121,165 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2045b539-6735-4e07-be91-9675e58c8e4e","listingId":"12d7c661-75d6-4d93-b6bc-60528110b07c","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.825Z"}],"sources":[{"listingId":"12d7c661-75d6-4d93-b6bc-60528110b07c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.825Z","lastSeenAt":"2026-04-22T11:33:03.238Z"}],"details":{"listingId":"12d7c661-75d6-4d93-b6bc-60528110b07c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/13 \\\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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/13 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/13"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call payment basis"],"bestFor":["Agents or developers who want zero-commitment, pay-per-use API access","Use cases requiring no rate limits and instant access without signup","Crypto-native workflows already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integration","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.008Z"},"updatedAt":"2026-04-22T11:33:03.238Z"}}