{"id":"130a3bfa-a61e-43ad-8af3-052c8b0c57a9","shortId":"5Ur8tD","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-purpose utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/23` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme. The endpoint accepts HTTP POST and returns `application/json`.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02 pricing. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion","generation"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","cheap API","402 payment API"],"warnings":["No documentation available — /api, /pricing, and /README all return only a 'Connect wallet' prompt with no technical content.","The specific purpose and request/response schema of /api/v1/messages/23 ('Premium API Access') is undocumented; the request and response examples above are inferred/guessed.","No OpenAPI spec, no example responses, and no error handling documentation found.","The broad category claims (AI, analytics, finance, utilities) cannot be independently verified from the crawl material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/23","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/23","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). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example responses, and the specific purpose of /api/v1/messages/23 is entirely unclear. The /api, /pricing, and /README pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/messages/23':109 '/pricing':209 '/readme':211 '/request':18,36 '0.02':17,35,69,131,198 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':124 '402 payment API' 'Base network API' 'USDC API' 'accept':148 'access':115 'address':139 'advertis':157 'ai':11,29,169 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':173 'analyt':12,30,54,163 'api':5,23,43,86,114 'application/json':153 'attach':97 'base':8,26,77,126,133 'beyond':201 'broad':48 'broader':155 'call':4,22 'caller':95 'categori':161 'challeng':120 'cheap API' 'classif':176 'collect':49 'commit':94 'connect':217 'convers':192 'conversion' 'cover':10,28 'crypto-quotes' 'data':53,58,162,166 'data-analytics' 'detail':224 'document':200 'embed':177 'enabl':42 'endpoint':51,65,107,147,158 'estim':187 'everi':64 'exact':143 'exchang':182 'export':167 'feed':181 'financ':13,31,178 'finance-data' 'finance/web3':57 'four':160 'gas':186 'gas-estimates' 'general':61 'general-purpos':60 'generat':193 'generation' 'geocod':190 'geocoding' 'header':101 'http':149 'i.e':130 'infer':56 'infrastructur':189 'insight':168 'key':87 'land':203 'learn':171 'limit':90 'list':111 'low payment fee API' 'lowpaymentfee.com':37 'machin':170 'metric':164 'micropayment API' 'network':78 'offer':46 'page':204,212 'paid':72 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':100,135,144 'per':3,21,70 'platform':44,156 'post':150 'premium':113 'price':67,180,199 'prompt':219 'protocol':82 'purpos':62 'quot':185 'rate':89,183 'report':165 'request':71,104,121 'resolv':214 'return':117,152 'scheme':145 'sentiment':172 'settl':137 'share':195 'simpli':96 'span':52 'spars':206 'specif':106 'suit':6,24 'summar':175 'technic':223 'text':174 'token':184 'unit':127 'upfront':93 'usdc':9,27,74,129 'usdc-base' 'use':141 'util':15,33,63 'valid':191 'validation' 'via':79 'wallet':218 'web3':179 'x402':41,81,99,119 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"8d8912d9-1165-4dc8-ae5b-8ed65a166a59","listingId":"130a3bfa-a61e-43ad-8af3-052c8b0c57a9","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.617Z"}],"sources":[{"listingId":"130a3bfa-a61e-43ad-8af3-052c8b0c57a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.617Z","lastSeenAt":"2026-04-22T02:32:07.364Z"}],"details":{"listingId":"130a3bfa-a61e-43ad-8af3-052c8b0c57a9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":{"message":"hello"},"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/23 requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Base, which equals $0.02.","source_url":"https://lowpaymentfee.com/api/v1/messages/23"},{"claim":"The platform lists endpoints across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/messages/23"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates on a per-call basis","Geocoding addresses or validating data with zero upfront commitment","Exporting analytics data or generating insights with micropayments","Embedding text for search or retrieval-augmented generation workflows"],"bestFor":["Agents or bots that need low-friction, keyless API access via crypto micropayments","Developers prototyping with multiple API categories (AI, finance, utilities) under one provider","Use cases where per-request billing at $0.02 is more economical than monthly subscriptions"],"notFor":["High-volume production workloads where bulk pricing or rate-limit guarantees are needed","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, uptime guarantees, or extensive documentation"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.766Z"},"updatedAt":"2026-04-22T02:32:07.364Z"}}