{"id":"59c73176-8ff3-4420-b7c5-e22c2a060f57","shortId":"dgRbcJ","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 collection 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/resource/9` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates 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 advertises a uniform $0.02/request pricing across all its endpoints.\n\nThe site lists 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). Documentation pages exist but appear to require a wallet connection and contain no visible content. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found in the crawl.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","low fee API","Base network API","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) appear to require wallet connection and returned no useful content during crawl.","No OpenAPI or JSON schema available — request and response formats are unknown.","The specific functionality of /api/resource/9 is unclear; 'Premium API Access' is a generic label.","The broader platform lists many endpoints but none were individually verified beyond this one."],"endpointUrl":"https://lowpaymentfee.com/api/resource/9","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/resource/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty (wallet-gated). The specific purpose of /api/resource/9 beyond 'Premium API Access' is 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'/request':19,38,140 '0.02':18,37,126,139 '000':115 '0x8335':120 '20':114 '2913':121 '6':131 'Base network API' 'USDC API' 'accept':103 'access':101 'across':142 'advertis':136 'ai':12,31,160 'ai-inference' 'ai/ml':56 'analysi':164 'analyt':55,154 'api':5,24,45,82,100 'appear':189 'base':8,27,75,116,123 'broader':134 'call':4,23,128 'categori':152 'challeng':108 'classif':167 'classification' 'collect':50 'connect':194 'contain':196 'content':199 'convers':183 'cost':112 'crawl':213 'crypto-data' 'crypto-paid API' 'data':11,30,54,59,153,157 'data-analytics' 'decim':132 'detail':206 'document':185,208 'embed':168 'embeddings' 'enabl':44 'endpoint':16,35,52,65,93,145,149,207 'equal':125 'estim':178 'exampl':204 'exchang':173 'exist':187 'export':158 'feed':172 'financ':13,32,169 'finance-data' 'finance/web3':58 'found':210 'four':151 'gas':177 'general':61 'generat':184 'geocod':181 'geocoding' 'indic':109 'infer':57 'infrastructur':180 'insight':159 'key':83 'learn':162 'limit':86 'list':97,148 'low fee API' 'lowpaymentfee.com':39 'machin':161 'maximum':111 'metric':155 'micropayment API' 'network':76 'offer':10,29 'openapi':201 'page':186 'paid':67 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,69,127 'per-request':68 'per-request-billing' 'platform':6,25,46,135 'post':104 'premium':99 'price':141,171 'protocol':80 'provid':48 'quot':176 'rate':85,174 'report':156 'request':70,105 'request/response':203 'requir':90,191 'schema':202 'sentiment':163 'sentiment-analysis' 'servic':63 'site':147 'span':53 'specif':92 'subscript':89 'summar':166 'text':165 'text-summarization' 'token':175 'uniform':138 'unit':117 'usdc':9,28,72,119,129 'usdc-base' 'use':71,130 'util':15,34,62 'utility-apis' 'valid':182 'via':77 'visibl':198 'wallet':193 'web3':170 'x402':43,79,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3e9b6d2d-fa91-4c41-aedd-e3386b39791b","listingId":"59c73176-8ff3-4420-b7c5-e22c2a060f57","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/resource/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:17.691Z"}],"sources":[{"listingId":"59c73176-8ff3-4420-b7c5-e22c2a060f57","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:17.691Z","lastSeenAt":"2026-04-23T14:00:43.928Z"}],"details":{"listingId":"59c73176-8ff3-4420-b7c5-e22c2a060f57","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/9 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/resource/9"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/9"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding and data validation as utility microservices","Programmatic data export and analytics without subscriptions"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing becomes expensive compared to bulk plans","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.329Z"},"updatedAt":"2026-04-23T14:00:43.928Z"}}