{"id":"b066b27a-6e29-4587-8e3f-234a07c4a7fa","shortId":"YY2f9P","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and general utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/332` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises four categories of APIs: 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 utilities (geocoding, validation, conversion, generation). Documentation pages exist but appear to require a wallet connection and contain no visible content, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","utility"],"synonyms":["low payment fee","x402 API","pay-per-request API","USDC API","Base network API","micropayment API","crypto API gateway"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no visible content — actual API schemas and behavior are undocumented.","The specific endpoint /api/v1/transactions/332 is labeled 'Premium API Access' but its exact functionality is unknown; it does not appear in the site's listed API catalog.","No OpenAPI spec or request/response schema is available for any endpoint.","No information on uptime guarantees, rate limits (site claims none), or data freshness."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/332","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/332","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 with clear pricing ($0.02 USDC on Base). However, documentation pages are empty (wallet-gated), there is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific '/transactions/332' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':19,38 '0.02':18,37,71,141 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '0x8335':135 '20':129 '2913':136 '300':162 '6':145 'Base network API' 'USDC API' 'accept':149 'access':117 'actual':223 'advertis':124,168 'ai':12,31,180 'ai-inference' 'ai/ml':57 'analysi':184 'analyt':56,174 'api':5,24,45,88,116,172 'appear':210 'application/json':120 'attach':99 'base':8,27,79,131,138 'broad':50 'broader':166 'call':4,23 'caller':97 'catalog':51 'categori':170 'challeng':123 'classif':187 'classification' 'commit':96 'connect':215 'contain':217 'content':220 'convers':204 'conversion' 'cost':127 'cover':10,29 'crypto API gateway' 'crypto-quotes' 'data':11,30,55,61,173,177 'data-analytics' 'decim':146 'discover':154 'document':206 'embed':188 'embeddings' 'enabl':44 'endpoint':16,35,53,67,109,148,228 'equal':140 'estim':198 'everi':66 'exchang':193 'exist':208 'export':178 'feed':192 'financ':13,32,189 'finance-data' 'finance/web3':59 'four':169 'gas':197 'gas-estimates' 'general':63 'generat':205 'geocod':202 'geocoding' 'given':142 'header':103 'individu':227 'infer':58 'infrastructur':200 'insight':179 'key':89 'learn':182 'limit':92 'list':113 'low payment fee' 'lowpaymentfee.com':39 'machin':181 'market':60 'maximum':126 'metric':175 'micropayment API' 'network':80 'offer':48 'page':207 'paid':74 'pay':2,21 'pay-per-cal':1,20 'pay-per-call' 'pay-per-request API' 'payment':102,155 'per':3,22,72 'platform':6,25,46,167 'post':150 'premium':115 'price':69,191 'protocol':84 'quot':196 'rate':91,194 'report':176 'request':73,106,151 'request/response':224 'requir':212 'return':119 'schema':225 'second':163 'sent':157 'sentiment':183 'sentiment-analysis' 'servic':65 'simpli':98 'span':54 'specif':108 'summar':186 'text':185 'text-summarization' 'timeout':164 'token':195 'unit':132 'unknown':230 'upfront':95 'usdc':9,28,76,134,143 'usdc-base' 'util':15,34,64,201 'valid':203 'validation' 'via':81 'visibl':219 'wallet':214 'web3':190 'x402':43,83,101,122 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e2e4228e-2f59-49b2-a9f1-e05ea19bf2c3","listingId":"b066b27a-6e29-4587-8e3f-234a07c4a7fa","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/332","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:05.303Z"}],"sources":[{"listingId":"b066b27a-6e29-4587-8e3f-234a07c4a7fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/332","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:05.303Z","lastSeenAt":"2026-04-22T10:02:26.738Z"}],"details":{"listingId":"b066b27a-6e29-4587-8e3f-234a07c4a7fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/332 \\\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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/332"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/332"}],"useCases":["Querying real-time financial data or exchange rates without managing API keys","Running AI inference tasks (sentiment, summarization, classification) on a per-call payment basis","Accessing geocoding or data conversion utilities with no subscription commitment","Fetching gas estimates or token quotes for Web3 applications","Exporting analytics data or generating insights on demand"],"bestFor":["Agents or bots that need keyless, on-demand API access paid per call","Developers prototyping across multiple API categories without subscription overhead","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing becomes expensive compared to subscription plans","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.953Z"},"updatedAt":"2026-04-22T10:02:26.738Z"}}