{"id":"7f7f9f22-75f1-4a7c-a138-2a6149915d02","shortId":"eyUEEJ","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 provides a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/customers/30` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform lists roughly 16 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 at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse; the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge returned), but the actual behavior and response format of `/api/v1/customers/30` specifically is unclear from available materials.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base-network","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","no-auth API"],"warnings":["No OpenAPI specification or request/response schema available","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/customers/30 ('Premium API Access') is not documented anywhere in the crawl","The broad endpoint catalog (16+ endpoints) is listed on the homepage but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/30","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/customers/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/customers/30 is undocumented. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/customers/30':96,242 '/docs':191 '/pricing':192 '/readme':195 '/request':19,38 '0.02':18,37,127,180 '000':116 '0x8335':121 '16':139 '20':115 '2913':122 '402':231 '6':132 'Base network API' 'USDC API' 'accept':104 'access':102 'across':141 'actual':236 'addit':206 'advertis':110 'ai':12,31,151 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':57 'analysi':155 'analyt':56,145 'api':5,24,45,83,101 'avail':222,247 'base':8,27,76,117,124 'behavior':237 'beyond':184 'broad':50 'broader':135 'call':4,23,129 'catalog':51 'categori':143 'challeng':109,232 'classif':158 'confirm':229 'connect':201 'convers':174 'conversion' 'cost':113 'crawl':225 'crypto-gas-estimates' 'data':11,30,55,60,144,148 'data-analytics' 'decim':133 'detail':208 'document':183,217 'embed':159 'enabl':44 'endpoint':16,35,53,66,94,140,227 'equal':126 'estim':169 'exampl':221 'exchang':164 'exchange-rates' 'export':149 'feed':163 'financ':13,32,160 'finance-price-feeds' 'finance/web3':59 'format':240 'four':142 'gas':168 'general':62 'generat':175 'geocod':172 'geocoding' 'infer':58 'infrastructure/utilities':171 'insight':150 'key':84 'land':186 'learn':153 'limit':87 'list':98,137 'live':230 'low payment fee' 'lowpaymentfee.com':39 'machin':152 'materi':248 'maximum':112 'metric':146 'micropayment API' 'network':77 'no-auth API' 'offer':10,29 'openapi':212 'page':187,196 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,70,128 'per-request':69 'per-request-pricing' 'platform':6,25,46,136 'point':182 'post':105 'premium':100 'price':162,181 'prompt':203 'protocol':81 'provid':48 'quot':167 'rate':86,165 'render':198 'report':147 'request':71,106 'request/response':215 'requir':91 'respons':239 'return':233 'rough':138 'schema':216 'sentiment':154 'servic':64 'span':54 'spars':189 'spec':213 'specif':93,243 'subscript':90 'summar':157 'technic':207 'text':156 'token':166 'unclear':245 'unit':118 'usag':220 'usdc':9,28,73,120,130 'usdc-base-network' 'use':72,131 'util':15,34,63 'valid':173 'validation' 'via':78 'wallet':202 'web3':161 'x402':43,80,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4a7b06c0-b11a-4c89-9f57-41b85aebef65","listingId":"7f7f9f22-75f1-4a7c-a138-2a6149915d02","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/customers/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:41.570Z"}],"sources":[{"listingId":"7f7f9f22-75f1-4a7c-a138-2a6149915d02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:41.570Z","lastSeenAt":"2026-04-22T23:00:55.610Z"}],"details":{"listingId":"7f7f9f22-75f1-4a7c-a138-2a6149915d02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/30 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 x402 challenge for /api/v1/customers/30 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/30"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates on a per-call basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding and validation without subscriptions"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost, no-commitment access to diverse API endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.01Z"},"updatedAt":"2026-04-22T23:00:55.610Z"}}