{"id":"577db93d-4be2-4de4-83fd-05d9df9110d6","shortId":"dMvrUv","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 infrastructure utilities. 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/115` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 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 beyond the landing page returned only a \"Connect wallet\" stub, so detailed request/response schemas for individual endpoints are not available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","crypto pay api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no actual content","No OpenAPI or schema available — request and response formats for this endpoint are unknown","The specific function of /api/v1/transactions/115 is not documented; 'Premium API Access' is a generic label","The broader catalog lists many endpoint categories but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/115","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/115","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation pages are empty stubs ('Connect wallet'), there is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of '/api/v1/transactions/115' beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,64,123 '000':112 '0x8335':117 '20':111 '2913':118 '300':136 '402 payment api' '6':127 'accept':141 'access':102 'account':76 'advertis':107,150 'ai':160 'ai-inference' 'ai/ml':49 'analysi':164 'analyt':48,154 'api':5,20,37,74,101 'application/json':146 'attach':84 'avail':207 'base':8,23,71,113,120 'base network api' 'beyond':188 'broad':42 'broader':148 'call':4,19 'caller':82 'catalog':43 'categori':151 'challeng':106 'classif':167 'classification' 'connect':195 'convers':183 'conversion' 'crypto pay api' 'crypto-quotes' 'data':47,52,153,157 'data-analytics' 'decim':128 'detail':199 'document':186 'embed':168 'embeddings' 'enabl':36 'endpoint':45,57,94,140,204 'equal':122 'estim':178 'exact':133 'exchang':173 'export':158 'feed':172 'financ':169 'finance-data' 'finance/web3':51 'gas':177 'gas-estimates' 'generat':184 'geocod':181 'geocoding' 'given':124 'header':88 'howev':185 'includ':152 'individu':203 'infer':50 'infrastructur':54,180 'insight':159 'key':75 'land':190 'learn':162 'limit':79 'list':98 'low payment fee' 'lowpaymentfee.com':31 'machin':161 'maxamountrequir':109 'metric':155 'micropayment api' 'network':9,24,72 'offer':40 'page':187,191 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'premium':100 'price':171 'quot':176 'rate':78,174 'report':156 'request':62,91,143 'request/response':200 'requir':81 'return':145,192 'schema':201 'scheme':131 'second':137 'sentiment':163 'sentiment-analysis' 'settl':66 'simpli':83 'span':46 'specif':93 'stub':197 'summar':166 'text':165 'text-summarization' 'timeout':138 'token':175 'unit':114 'usdc':15,30,68,116,125 'usdc api' 'usdc-base' 'util':55 'valid':182 'validation' 'via':10,25 'wallet':196 'web3':170 'x402':11,26,35,86,105 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7e41a56d-a80c-4eca-b031-03b6071a9cf1","listingId":"577db93d-4be2-4de4-83fd-05d9df9110d6","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/115","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:18.889Z"}],"sources":[{"listingId":"577db93d-4be2-4de4-83fd-05d9df9110d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/115","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:18.889Z","lastSeenAt":"2026-04-22T23:02:07.618Z"}],"details":{"listingId":"577db93d-4be2-4de4-83fd-05d9df9110d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/115 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/115"},{"claim":"Platform offers categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without API key management","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 as utility microservices","Programmatic data export and analytics reporting"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for low-volume usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing becomes expensive","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.439Z"},"updatedAt":"2026-04-22T23:02:07.618Z"}}