{"id":"101ae054-7c57-4471-8a8d-0020922b1792","shortId":"FBqX5L","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 catalog 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/369` is listed as \"Premium API Access\" and returns an x402 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 categories including: 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). However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no actual technical documentation, so the specific request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","data","ai","finance"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) returned no content — only a 'Connect wallet' prompt","No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/transactions/369 ('Premium API Access') is unclear — it does not match any of the advertised endpoint categories on the landing page","Request and response body schemas are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/369","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/369","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, and the landing page describes the platform's catalog and pricing. However, all documentation pages are empty (showing only 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and the specific functionality of /api/v1/transactions/369 ('Premium API Access') is entirely opaque. This is effectively a stub 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'/api/v1/transactions/369':96 '/docs':188 '/pricing':189 '/readme':191 '/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':136 '6':127 'Base network API' 'USDC API' 'accept':141 'access':102 'account':76 'actual':201 'advertis':150 'ai':160 'ai/ml':49 'analysi':164 'analyt':48,154 'api':5,20,37,74,101 'application/json':146 'attach':84 'base':8,23,71,113,120 'base-network' 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':151 'challeng':107 'classif':167 'connect':196 'convers':183 'crypto-paid API' 'data':47,52,153,157 'decim':128 'document':186,203 'embed':168 'enabl':36 'endpoint':45,57,94,140,211 'equal':122 'estim':178 'exact':133 'exchang':173 'export':158 'feed':172 'financ':169 'finance/web3':51 'gas':177 'generat':184 'geocod':181 'given':124 'header':88 'howev':185 'includ':152 'individu':210 'infer':50 'infrastructur':180 'insight':159 'json-response' 'key':75 'learn':162 'limit':79 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':161 'metric':155 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'page':187 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'post-method' 'premium':100 'price':171 'prompt':198 'quot':176 'rate':78,174 'report':156 'request':62,91,108,143 'request/response':207 'requir':81 'return':104,145,193 'schema':208 'scheme':131 'second':137 'sentiment':163 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93,206 'summar':166 'technic':202 'text':165 'timeout':138 'token':175 'unit':114 'unknown':213 'usdc':15,30,68,116,125 'usdc-settlement' 'util':54 'valid':182 'via':10,25 'wallet':197 'web3':170 'x402':11,26,35,86,106 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f819c686-8583-4c7b-990b-d75daa98904d","listingId":"101ae054-7c57-4471-8a8d-0020922b1792","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/369","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:27.081Z"}],"sources":[{"listingId":"101ae054-7c57-4471-8a8d-0020922b1792","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/369","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:27.081Z","lastSeenAt":"2026-04-22T10:32:22.654Z"}],"details":{"listingId":"101ae054-7c57-4471-8a8d-0020922b1792","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/369 \\\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 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 returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/369"},{"claim":"Platform offers categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and metrics without creating an account or managing API keys","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching financial data like exchange rates, token quotes, and gas estimates via micropayments","Using utility services like geocoding, validation, and data conversion on demand"],"bestFor":["Agents or developers who want zero-friction API access without signup or subscriptions","Crypto-native applications that can settle payments in USDC on Base","Low-volume or sporadic API consumers who benefit from pure pay-per-use pricing"],"notFor":["High-volume consumers who need bulk pricing or rate-limited throughput guarantees","Users without a Base-compatible wallet or USDC holdings","Anyone needing detailed API documentation or guaranteed SLAs — docs are currently empty"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.857Z"},"updatedAt":"2026-04-22T10:32:22.654Z"}}