{"id":"1ff63f43-a546-4f78-b58e-2b48e2ccfcc3","shortId":"sVCVYq","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. 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/transactions/245` 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 platform's landing page confirms a uniform $0.02/request pricing across all listed endpoints.\n\nOther endpoints on the platform include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export. Documentation pages beyond the landing page were largely empty (showing only a \"Connect wallet\" prompt), so detailed request/response schemas for individual endpoints are not available. The endpoint is live and returns a valid 402 challenge with x402 version 1.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-api","data-analytics","ai-inference","finance-data","utility-services","no-api-key","no-rate-limits"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API billing"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no actual content.","No OpenAPI or schema available — request and response formats for this endpoint are unknown.","The specific function of /api/v1/transactions/245 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint.","The platform lists many endpoint categories but without documentation it is unclear which are actually functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/245","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/transactions/245","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are effectively empty, there is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of '/api/v1/transactions/245' beyond 'Premium API Access' is 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'/request':19,38,143 '0.02':18,37,127,142 '000':116 '0x8335':121 '1':209 '20':115 '2913':122 '402':204 '6':132 'Base network API' 'USDC API' 'accept':104 'access':102 'across':145 'advertis':110 'ai':12,31,57 'ai-inference' 'analysi':156 'analyt':56 'api':5,24,45,83,101 'avail':195 'base':8,27,76,117,124 'beyond':173 'broad':50 'call':4,23,129 'catalog':51 'challeng':109,205 'classif':159 'confirm':139 'connect':183 'convers':167 'cost':113 'cover':10,29 'crypto-paid API' 'data':11,30,55,169 'data-analytics' 'decim':133 'detail':187 'document':171 'embed':160 'empti':179 'enabl':44 'endpoint':16,35,53,66,94,148,150,192,197 'equal':126 'exchang':163 'export':170 'feed':162 'financ':13,32,60 'finance-data' 'geocod':165 'includ':154 'individu':191 'infrastructur':63 'key':84 'land':137,175 'larg':178 'learn':59 'limit':87 'list':98,147 'live':199 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'maximum':112 'micropayment API' 'network':77 'no-api-key' 'no-rate-limits' 'offer':48 'page':138,172,176 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,70,128 'per-request':69 'per-request-billing' 'platform':6,25,46,135,153 'post':105 'post-api' 'premium':100 'price':144,161 'prompt':185 'protocol':81 'rate':86,164 'request':71,106 'request/response':188 'requir':91 'return':201 'schema':189 'sentiment':155 'serverless API billing' 'show':180 'span':54 'specif':93 'subscript':90 'summar':158 'text':157 'uniform':141 'unit':118 'usdc':9,28,73,120,130 'usdc-base' 'use':72,131 'util':15,34,64 'utility-services' 'valid':166,203 'version':208 'via':78 'wallet':184 'web3':61 'x402':43,80,108,207 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"423e7c7a-c98b-4924-8001-67c79623b4bb","listingId":"1ff63f43-a546-4f78-b58e-2b48e2ccfcc3","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/transactions/245","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:30.016Z"}],"sources":[{"listingId":"1ff63f43-a546-4f78-b58e-2b48e2ccfcc3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/245","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:30.016Z","lastSeenAt":"2026-04-22T19:32:15.831Z"}],"details":{"listingId":"1ff63f43-a546-4f78-b58e-2b48e2ccfcc3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/245 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/245"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/245"}],"useCases":["Agents needing on-demand access to analytics, AI inference, or financial data without managing API keys","Paying per-request for text summarization or sentiment analysis via USDC on Base","Fetching real-time exchange rates or gas estimates with no subscription commitment","Geocoding or data validation as a utility microservice"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers who want zero-friction, keyless API access","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.046Z"},"updatedAt":"2026-04-22T19:32:15.831Z"}}