{"id":"30df0da8-b6a1-4a93-9f47-15c80cf07620","shortId":"gDt4Ak","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 broad set of endpoints spanning 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/137` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment timeout is 300 seconds.\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). However, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","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","serverless api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no technical content.","The specific function of /api/v1/transactions/137 is undocumented — 'Premium API Access' is the only description available.","No request body schema or response schema is documented for any endpoint.","The broad catalog of endpoints (AI, finance, analytics, utils) is advertised on the landing page but none have verifiable documentation or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/137","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but documentation pages are effectively empty (\"Connect wallet\" only). No request/response schemas, no examples, and the specific purpose of the /api/v1/transactions/137 endpoint beyond \"Premium API Access\" is unclear. The listing is largely a 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'/request':13,28 '0.02':12,27,64,121 '000':110 '0x8335':115 '20':109 '2913':116 '300':145 '6':125 'accept':135 'access':102 'account':76 'actual':208 'advertis':104,150 'ai':162 'ai-inference' 'ai/ml':49 'amount':107 'analysi':166 'analyt':48,156 'api':5,20,37,74,101,154 'application/json':140 'attach':84 'base':8,23,71,111,118 'base network api' 'base-network' 'beyond':191 'broad':42 'broader':148 'call':4,19 'caller':82 'categori':152 'challeng':129 'classif':169 'classification' 'confirm':130 'connect':198 'convers':186 'data':47,52,155,159 'data-analytics' 'decim':126 'detail':205 'document':189 'embed':170 'embeddings' 'enabl':36 'endpoint':45,57,94,132,213 'equal':120 'estim':180 'exchang':175 'export':160 'feed':174 'financ':171 'finance-data' 'finance/web3':51 'four':151 'gas':179 'generat':187 'geocod':184 'geocoding' 'given':122 'header':88 'howev':188 'individu':212 'infer':50 'infrastructur':182 'insight':161 'key':75 'land':193 'learn':164 'limit':79 'list':98 'live':134 'low payment fee' 'lowpaymentfee.com':31 'machin':163 'max':106 'metric':157 'micropayment api' 'network':9,24,72 'no-api-key' 'offer':40 'page':190,194 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,142 'per':3,18,61 'platform':6,21,38,149 'post':136 'premium':100 'price':173 'prompt':200 'quot':178 'rate':78,176 'report':158 'request':62,91,137 'request/response':209 'requir':81 'return':139,195 'schema':210 'second':146 'sentiment':165 'sentiment-analysis' 'serverless api' 'servic':55 'set':43 'settl':66 'simpli':83 'span':46 'specif':93 'summar':168 'technic':204 'text':167 'text-summarization' 'timeout':143 'token':177 'unit':112 'unknown':215 'usdc':15,30,68,114,123 'usdc api' 'usdc-settlement' 'util':54,183 'utility-services' 'valid':185 'via':10,25 'wallet':199 'web3':172 'x402':11,26,35,86,128 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"881d643d-6c7e-430c-b5dd-6d62fdb26743","listingId":"30df0da8-b6a1-4a93-9f47-15c80cf07620","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:28.553Z"}],"sources":[{"listingId":"30df0da8-b6a1-4a93-9f47-15c80cf07620","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:28.553Z","lastSeenAt":"2026-04-22T13:31:44.848Z"}],"details":{"listingId":"30df0da8-b6a1-4a93-9f47-15c80cf07620","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/137 \\\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":"All endpoints are 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":"The x402 challenge for /api/v1/transactions/137 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/137"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven data retrieval without pre-registration or API keys","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 utilities with no subscription commitment","Programmatic data export and analytics reporting"],"bestFor":["AI agents needing frictionless, keyless API access via x402","Developers who want pay-as-you-go pricing without subscriptions","Web3-native applications that can settle in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing may add up vs. bulk plans","Users who need detailed API documentation and guaranteed SLAs (docs are currently sparse)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.984Z"},"updatedAt":"2026-04-22T13:31:44.848Z"}}