{"id":"8344163d-0961-437a-b596-3662d0b5a44c","shortId":"NKfBAG","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — 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 pay-per-request 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/transfers/95` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made by including an X-PAYMENT header with each request — no API keys, accounts, or rate limits are required. The x402 challenge specifies the \"exact\" payment scheme with a 300-second timeout.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI specification, no request/response schema documentation, and no usage examples. It is unclear what data or functionality the `/api/v1/transfers/95` endpoint specifically returns, as the description is generic (\"Premium API Access\") and does not match any of the named categories on the homepage.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key","no-rate-limits"],"categories":["data","llm","finance","infrastructure"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto payment API","serverless API"],"warnings":["No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'","The endpoint path /api/v1/transfers/95 does not match any of the named endpoints on the homepage; its actual functionality is unknown","No request body schema or response format documented anywhere","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/95","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/transfers/95","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the specific endpoint's purpose ('Premium API Access' at /transfers/95) is ambiguous and doesn't map to any named service on the homepage. Docs pages are 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'/api/v1/transfers/95':117,230 '/docs':192 '/pricing':193 '/readme':196 '/request':19,38 '0.02':18,37,99,142 '000':131 '0x8335':136 '20':130 '2913':137 '300':175 'Base network API' 'USDC API' 'access':123,241 'account':159 'across':58 'addit':207 'advertis':125 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,122,157,240 'avail':186 'base':8,27,107,132,139 'broad':50 'call':4,23 'catalog':51 'categori':60,250 'challeng':167 'classif':75 'classification' 'connect':202 'content':208 'convers':92 'cost':128 'crypto payment API' 'data':11,30,61,65,226 'data-analytics' 'descript':236 'document':178,217 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,187,231 'equal':141 'estim':86 'exact':170 'exampl':221 'exchang':81 'export':66 'extrem':180 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':228 'gas':85 'generat':93 'generic':238 'geocod':90 'geocoding' 'header':152 'homepag':253 'includ':147 'infrastructur':88 'insight':67 'key':158 'land':183 'learn':70 'limit':162 'list':119,185 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':145 'match':245 'maximum':127 'metric':63 'micropayment API' 'name':249 'network':108 'no-api-key' 'no-rate-limits' 'offer':48 'openapi':212 'page':184,197 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':143,151,171 'per':3,22,55,100 'platform':6,25,46 'premium':121,239 'price':79,97,189 'prompt':204 'protocol':112 'quot':84 'rate':82,161 'render':199 'report':64 'request':56,101,155 'request/response':215 'requir':164 'return':233 'schema':216 'scheme':172 'second':176 'sentiment':71 'sentiment-analysis' 'serverless API' 'spars':181 'specif':114,213,232 'specifi':168 'summar':74 'text':73 'text-summarization' 'timeout':177 'token':83 'unclear':224 'unit':133 'usag':220 'usdc':104,135 'usdc-base' 'util':15,34,89 'valid':91 'via':9,28,109 'wallet':203 'web3':78 'x':150 'x-payment':149 'x402':10,29,43,111,166 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4992ed64-daa0-4048-b8a5-85879e84fc35","listingId":"8344163d-0961-437a-b596-3662d0b5a44c","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/transfers/95","description":"Premium API 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<x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transfers/95"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without signup or API keys","Fetching real-time financial data (prices, exchange rates, gas estimates) on a per-call basis","Running utility operations (geocoding, validation, conversion) with instant crypto micropayments","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["Developers who want instant API access without account creation","AI agents that can settle payments via x402 on Base","Projects needing low-cost, no-commitment API calls at $0.02 each"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.881Z"},"updatedAt":"2026-04-22T21:31:48.523Z"}}