{"id":"0e615aa5-83ab-4232-b5c7-28451bd54f64","shortId":"6rv42A","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base 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, 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 — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/183` is listed as \"Premium API Access\" and returns a standard x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the payTo address on Base. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind the \"Premium API Access\" resource 183 endpoint is not described anywhere, making it unclear what data or service it provides. Prospective users should be aware that without documentation, the behavior of this specific endpoint is essentially unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","ai-inference","data-analytics","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API","serverless API"],"warnings":["The specific endpoint /api/v1/generate/resource/183 has no documentation describing its purpose or expected input/output.","All documentation pages (/docs, /pricing, /api, /README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI specification or request/response schema is available.","The broad catalog of endpoints listed on the homepage cannot be individually verified from the crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/183","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/generate/resource/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what this specific resource (183) actually does. No OpenAPI spec, no request/response schemas, and no examples are available. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/generate/resource/183':118 '/docs':180 '/pricing':181 '/readme':184 '/request':17,34 '0.02':16,33,90,144 '000':139 '183':224 '20':138 '300':164 '402':132 '6':149 'Base network API' 'USDC API' 'accept':169 'access':124,222 'across':50 'actual':216 'address':154 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'anywher':229 'api':4,21,41,105,123,221 'application/json':174 'avail':210 'awar':243 'base':7,24,98,140,156 'behavior':248 'behind':218 'broad':46 'catalog':47 'categori':52 'challeng':130 'classif':66 'commit':113 'connect':190 'content':196 'convers':83 'crawl':213 'crypto-paid API' 'data':9,26,53,234 'data-analytics' 'decim':150 'describ':228 'document':175,205,246 'embed':67 'enabl':40 'endpoint':14,31,49,86,116,168,225,252 'essenti':254 'estim':77 'exact':161 'exampl':209 'exchang':72 'export':57 'expos':44 'extrem':177 'feed':71 'financ':11,28,68 'finance-data' 'four':51 'function':217 'gas':76 'generat':84 'geocod':81 'http':131 'infrastructur':79 'insight':58 'json-api' 'key':106 'learn':61 'limit':109 'list':120 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':60 'make':230 'materi':214 'metric':55 'micropayment API' 'network':99 'no-api-key' 'offer':8,25 'openapi':200 'page':185 'paid':93 'pay-per-call API' 'pay-per-request' 'payabl':3,20 'payment':134,158 'payto':153 'per':91 'platform':5,22,42 'post':170 'post-method' 'premium':122,220 'price':70,88 'prompt':192 'prospect':239 'protocol':103 'provid':238 'quot':75 'rate':73,108 'render':187 'report':56 'request':92,133,171 'request/response':203 'resourc':223 'return':126,173 'schema':204 'scheme':159 'second':165 'sentiment':62 'serverless API' 'servic':236 'sinc':146 'spars':178 'spec':201 'specif':115,251 'standard':128 'summar':65 'text':64 'timeout':166 'token':74 'unclear':232 'unit':141 'unknown':255 'upfront':112 'usag':208 'usd':145 'usdc':95,143,147 'usdc-base' 'use':148 'user':240 'util':13,30,80 'utility-services' 'valid':82 'via':100 'wallet':191 'web3':69 'without':245 'x402':2,19,39,102,129 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"89a5b651-3904-433a-9e3f-8a67acbec809","listingId":"0e615aa5-83ab-4232-b5c7-28451bd54f64","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/generate/resource/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:08.999Z"}],"sources":[{"listingId":"0e615aa5-83ab-4232-b5c7-28451bd54f64","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:08.999Z","lastSeenAt":"2026-04-23T16:06:39.787Z"}],"details":{"listingId":"0e615aa5-83ab-4232-b5c7-28451bd54f64","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/183 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x8335…)","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/183"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call crypto payment","Running utility operations like geocoding or data validation via a simple POST with x402 payment"],"bestFor":["AI agents with USDC on Base that need diverse API access without subscription management","Developers prototyping integrations who want instant, keyless API access","Low-volume or bursty workloads where pay-per-request at $0.02 is cost-effective"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.737Z"},"updatedAt":"2026-04-23T16:06:39.787Z"}}