{"id":"cd05e6a6-541a-423e-a26a-48345f66f739","shortId":"WgGfwA","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/111` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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). Documentation pages exist at /docs, /pricing, and /api but currently show only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all return only 'Connect wallet' with no actual content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/transactions/111 is undocumented — 'Premium API Access' is vague","Request and response body formats are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/111","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/transactions/111","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are empty (showing only 'Connect wallet'), there is no OpenAPI spec, and no request/response schemas or examples are available for any endpoint. The specific purpose of /api/v1/transactions/111 beyond 'Premium API Access' is 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'/api/v1/transactions/111':95 '/docs':190 '/pricing':191 '/request':13,28 '0.02':12,27,63,122 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '6':126 'accept':140 'access':101 'account':75 'across':45 'actual':208 'advertis':149 'ai':161 'ai-inference' 'ai/ml':48 'analysi':165 'analyt':47,155 'api':5,20,37,73,100 'application/json':145 'attach':83 'base':8,23,70,112,119 'base network api' 'broader':147 'call':4,19 'caller':81 'categori':153 'challeng':106 'classif':168 'classification' 'connect':199 'content':205 'convers':184 'conversion' 'crypto-quotes' 'current':195 'data':46,51,154,158 'data-analytics' 'decim':127 'document':186 'embed':169 'embeddings' 'enabl':36 'endpoint':44,56,93,139,150,213 'equal':121 'estim':179 'exact':132 'exchang':174 'exist':188 'export':159 'feed':173 'financ':170 'finance-data' 'finance/web3':50 'four':152 'gas':178 'gas-estimates' 'generat':185 'geocod':182 'geocoding' 'given':123 'header':87 'individu':212 'infer':49 'infrastructur':181 'insight':160 'key':74 'learn':163 'limit':78 'list':97 'low payment fee' 'lowpaymentfee.com':31 'machin':162 'metric':156 'micropayment api' 'network':9,24,71 'no-auth api' 'offer':40 'page':187 'pay':2,17,59 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':58 'payment':86,129 'per':3,18,60 'platform':6,21,38,148 'post':141 'premium':99 'price':172 'prompt':201 'quot':177 'rate':77,175 'report':157 'request':61,90,107,142 'request/response':209 'requir':80 'return':103,144 'schema':210 'scheme':130 'second':136 'sentiment':164 'sentiment-analysis' 'servic':54 'settl':65 'show':196 'simpli':82 'specif':92 'substant':204 'summar':167 'text':166 'text-summarization' 'timeout':137 'token':176 'unit':113 'unknown':215 'usdc':15,30,67,115,124 'usdc api' 'usdc-base' 'util':53 'valid':183 'validation' 'varieti':42 'via':10,25 'wallet':200 'web3':171 'x402':11,26,35,85 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9c36de39-d787-43e4-9bc3-d9567639cd29","listingId":"cd05e6a6-541a-423e-a26a-48345f66f739","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/transactions/111","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:13.117Z"}],"sources":[{"listingId":"cd05e6a6-541a-423e-a26a-48345f66f739","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/111","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:13.117Z","lastSeenAt":"2026-04-22T23:02:06.798Z"}],"details":{"listingId":"cd05e6a6-541a-423e-a26a-48345f66f739","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/111 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/111"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/111"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes and gas estimates programmatically","Running geocoding or data validation as a utility microservice with per-call billing","Exporting analytics data or generating insights reports on demand"],"bestFor":["AI agents that need simple pay-per-call access without signup or API keys","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that can settle micropayments in USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.648Z"},"updatedAt":"2026-04-22T23:02:06.798Z"}}