{"id":"bc68a953-0adb-4c05-b440-7ab186d5c35c","shortId":"U2AXdE","kind":"x402","title":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","tagline":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/keys/85` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to the provider's wallet. The timeout window is 300 seconds.\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 are priced identically at $0.02 per call. However, no OpenAPI schema, request/response examples, or detailed documentation were found for any endpoint, so the actual input parameters and response formats remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["ai","data","finance","infrastructure"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","serverless API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/keys/85 ('Premium API Access') is undocumented and unclear — it may be a key-generation or access-granting endpoint rather than a data API","No request or response examples could be found","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/85","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/keys/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a marketing landing page. The purpose of this specific endpoint (/api/v1/keys/85 — 'Premium API Access') is unclear and may differ from the other listed endpoints. Effectively a stub 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'/request':12,29 '0.02':11,28,62,133,201 '000':122 '0x8335':127 '20':121 '2913':128 '300':154 '6':137 'Base network API' 'USDC API' 'accept':110 'access':6,23,108 'actual':220 'advertis':116,159 'ai':171 'ai-inference' 'ai/ml':52 'amount':119 'analysi':175 'analyt':51,165 'api':5,22,41,79,107 'attach':91 'base':8,25,70,123,130 'broader':157 'call':4,21,203 'caller':89 'categori':163 'chain':144 'challeng':115 'classif':178 'classification' 'convers':194 'cost':61 'crypto-paid API' 'data':50,55,164,168 'data-analytics' 'decim':138 'detail':211 'document':212 'embed':179 'embeddings' 'enabl':40 'endpoint':48,60,100,160,217 'equal':132 'estim':189 'everi':59 'exampl':209 'exchang':184 'export':169 'feed':183 'financ':180 'finance-data' 'finance/web3':54 'format':225 'found':214 'four':162 'gas':188 'generat':195 'geocod':192 'geocoding' 'given':134 'header':94 'howev':204 'ident':199 'infer':53 'infrastructur':191 'input':221 'insight':170 'key':16,33,80 'learn':173 'limit':88 'list':104 'low fee API' 'lowpaymentfee.com':35 'machin':172 'max':118 'mean':75 'metric':166 'micropayment API' 'network':71 'no-api-key' 'offer':44 'on-chain':142 'openapi':206 'paid':65 'paramet':222 'pay':2,19 'pay per call API' 'pay-per-cal':1,18 'pay-per-request' 'payment':93,139 'per':3,20,63,202 'platform':42,158 'post':111 'premium':106 'price':182,198 'protocol':74 'provid':147 'quot':187 'rate':87,185 'remain':226 'report':167 'request':64,97,112 'request/response':208 'requir':17,34 'respons':224 'schema':207 'second':155 'sentiment':174 'sentiment-analysis' 'serverless API access' 'servic':58 'settl':141 'sign':83 'sign-up':82 'simpli':90 'span':49 'specif':99 'suit':46 'summar':177 'text':176 'text-summarization' 'timeout':151 'token':186 'unit':124 'unknown':227 'up':84 'usdc':14,31,67,126,135 'usdc-base' 'util':57 'utility-services' 'valid':193 'via':9,26 'wallet':149 'web3':181 'window':152 'x402':10,27,39,73,114 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"b9d5ed05-6d22-4246-adab-90a4b94e1177","listingId":"bc68a953-0adb-4c05-b440-7ab186d5c35c","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/keys/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.778Z"}],"sources":[{"listingId":"bc68a953-0adb-4c05-b440-7ab186d5c35c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.778Z","lastSeenAt":"2026-04-22T01:02:19.189Z"}],"details":{"listingId":"bc68a953-0adb-4c05-b440-7ab186d5c35c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/85 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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/keys/85 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/85"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data like token quotes, gas estimates, or exchange rates with per-call payment","Running data analytics queries or exporting data with no subscription commitment","Geocoding, validation, or conversion utilities paid per use via crypto"],"bestFor":["AI agents and bots that can attach x402 payment headers automatically","Developers who want zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call crypto settlement adds latency or cost overhead","Callers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.272Z"},"updatedAt":"2026-04-22T01:02:19.189Z"}}