{"id":"ff1ca405-9bd6-40b9-92fd-10319f23cb27","shortId":"wdvW8n","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/crypto market data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/resource/27` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what `/api/resource/27` specifically returns versus the named endpoints listed on the homepage.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no technical content","No OpenAPI or schema available — request and response formats for /api/resource/27 are unknown","The endpoint path '/api/resource/27' does not match any of the named endpoints listed on the homepage; its specific function is unclear","No request/response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/resource/27","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/27","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The specific purpose of /api/resource/27 versus the named endpoints is 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'/request':19,38 '0.02':18,37,125,187 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':114 '300':140 '6':130 'accept':103 'access':101 'across':148 'address':136 'advertis':146 'ai':12,31,158 'ai-inference' 'ai/ml':56 'analysi':162 'analyt':55,152 'api':5,24,45,84,100,197 'base':8,27,76,116,122 'base network api' 'broader':144 'call':4,23 'categori':150 'challeng':108 'classif':165 'classification' 'collect':50 'connect':206 'convers':181 'cost':112 'crypto-quotes' 'data':11,30,54,60,151,155 'data-analytics' 'decim':131 'descript':224 'detail':213 'doc':196 'document':191 'embed':166 'embeddings' 'enabl':44 'endpoint':16,35,52,66,93,147,233 'equal':124 'estim':176 'exampl':221 'exchang':171 'export':156 'extrem':193 'feed':170 'financ':13,32,167 'finance-data' 'finance/crypto':58 'four':149 'gas':175 'general':62 'generat':182 'geocod':179 'geocoding' 'homepag':237 'howev':190 'indic':109 'infer':57 'infrastructur':178 'insight':157 'key':85 'learn':160 'limit':87 'list':97,234 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':159 'market':59 'maximum':111 'metric':153 'micropayment api' 'name':232 'network':77 'offer':10,29 'openapi':217 'page':201 'paid':68 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'payment':132 'per':3,22,70,126,188 'per-request':69 'per-request-billing' 'platform':6,25,46,145 'post':104 'premium':99 'price':169,185,198 'prompt':208 'protocol':81 'provid':48 'quot':174 'rate':86,172 'readm':200 'render':203 'report':154 'request':71,105,127,189 'request/response':220 'requir':90 'return':229 'schema':218 'second':141 'sent':134 'sentiment':161 'sentiment-analysis' 'servic':64 'span':53 'spars':194 'specif':92,228 'subscript':89 'summar':164 'technic':212 'text':163 'text-summarization' 'timeout':142 'token':173 'unit':117 'usdc':9,28,73,119,128 'usdc api' 'usdc-base' 'use':72,129 'util':15,34,63 'utility-services' 'valid':180 'versus':230 'via':78 'wallet':207 'web3':168 'x402':43,80,107 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"98f4618a-a9e2-4ac3-b2cd-eecb02d13881","listingId":"ff1ca405-9bd6-40b9-92fd-10319f23cb27","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:52.189Z"}],"sources":[{"listingId":"ff1ca405-9bd6-40b9-92fd-10319f23cb27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:52.189Z","lastSeenAt":"2026-04-23T00:31:04.035Z"}],"details":{"listingId":"ff1ca405-9bd6-40b9-92fd-10319f23cb27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/27 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/resource/27"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/resource/27"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto and finance data (prices, exchange rates, gas estimates) on a per-call basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Developers wanting zero-setup, pay-as-you-go API access via crypto","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost, no-commitment access to diverse API endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:20:38.227Z"},"updatedAt":"2026-04-23T00:31:04.035Z"}}