{"id":"eb1f5420-f25d-4841-be3e-b21078fa2aa2","shortId":"qykyKw","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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/transactions/315` is listed as \"Premium API Access\" and returns `application/json` via HTTP POST.\n\nThe site 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). All endpoints follow the same $0.02 flat pricing model.\n\nThe x402 challenge for this endpoint specifies a `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network using the exact payment scheme. The endpoint is live and responds with a proper 402 challenge. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for this specific endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","http-post"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","web3 API marketplace"],"warnings":["No OpenAPI or schema documentation available — request/response format for this endpoint is unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no actual content","The purpose of /api/v1/transactions/315 is unclear; 'Premium API Access' is a generic label with no further explanation","Cannot verify what data or service this specific endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/315","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/315","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, there is no OpenAPI spec, no documentation for request/response schemas, and all doc pages are empty stubs. The specific purpose of /api/v1/transactions/315 ('Premium API Access') is entirely opaque — it's unclear what data or service it actually 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'/request':13,28 '0.02':12,27,59,142,165 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '20000':156 '402':190 '6':161 'Base network API' 'USDC micropayment API' 'access':90 'actual':211 'address':170 'advertis':99 'ai':111 'ai/ml':49 'analysi':115 'analyt':48,105 'api':5,20,37,71,89,103 'application/json':93 'base':8,23,67,157,174 'beyond':194 'broad':42 'call':4,19 'catalog':43 'categori':101 'challeng':148,191 'classif':118 'connect':207 'convers':135 'cost':58 'crypto API access' 'data':47,52,104,108 'decim':162 'document':193 'embed':119 'empti':200 'enabl':36 'endpoint':45,57,82,138,151,182,217 'equal':164 'essenti':199 'estim':129 'everi':56 'exact':178 'exchang':124 'export':109 'feed':123 'financ':120 'finance/web3':51 'flat':143 'follow':139 'four':100 'gas':128 'generat':136 'geocod':133 'howev':192 'http':95 'http-post' 'infer':50 'infrastructur':131 'insight':110 'json-api' 'key':72 'land':196 'learn':113 'limit':75 'list':86 'live':184 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'made':168 'maxamountrequir':154 'metric':106 'model':145 'network':9,24,68,175 'no-api-key' 'offer':40 'page':197,204 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':166,179 'per':3,18,60 'platform':6,21,38 'post':96 'premium':88 'price':122,144 'proper':189 'quot':127 'rate':74,125 'report':107 'request':61 'request/response':212 'requir':79 'respond':186 'return':92 'schema':213 'scheme':180 'sentiment':114 'servic':55 'show':206 'site':98 'span':46 'specif':81,216 'specifi':152 'sub':203 'sub-pag':202 'subscript':78 'summar':117 'text':116 'token':126 'unit':158 'unknown':219 'usdc':15,30,64,160 'usdc-base-network' 'use':176 'util':54,132 'valid':134 'via':10,25,94 'wallet':208 'web3':121 'web3 API marketplace' 'x402':11,26,35,147 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2d65aa34-28d1-4db3-baf1-67cbf28ff459","listingId":"eb1f5420-f25d-4841-be3e-b21078fa2aa2","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/315","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:59.834Z"}],"sources":[{"listingId":"eb1f5420-f25d-4841-be3e-b21078fa2aa2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/315","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:59.834Z","lastSeenAt":"2026-04-22T20:01:39.774Z"}],"details":{"listingId":"eb1f5420-f25d-4841-be3e-b21078fa2aa2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/315 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/315"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing API keys or subscriptions","Making one-off API calls paid per-request in USDC on Base","Agent-driven workflows that need low-friction, pay-as-you-go API access"],"bestFor":["Developers wanting zero-commitment, per-call API pricing","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native payment rails over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.188Z"},"updatedAt":"2026-04-22T20:01:39.774Z"}}