{"id":"e7048e91-79d9-4891-9732-de686d1553ab","shortId":"9BSeTr","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 set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/transactions/40` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all listed endpoints.\n\nOther endpoints on the same platform include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no additional technical detail, so the actual request/response schemas for this specific endpoint are unknown.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no technical content","The specific purpose and request/response schema of /api/v1/transactions/40 are unknown","No OpenAPI spec or ai-plugin manifest found","The endpoint name 'Premium API Access' is generic and does not describe actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/40","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific '/transactions/40' endpoint is entirely opaque beyond the generic 'Premium API Access' label. All doc pages returned only 'Connect wallet' with no 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'/request':19,38,143 '0.02':18,37,127,142,177 '000':116 '0x8335':121 '20':115 '2913':122 '6':132 'Base network API' 'USDC API' 'accept':104 'access':102 'across':146 'actual':199 'addit':194 'advertis':110 'ai':12,31,57 'ai-inference' 'analysi':158 'analyt':56 'api':5,24,45,83,101 'base':8,27,76,117,124 'beyond':182 'broad':50 'call':4,23,129 'challeng':109 'classif':161 'confirm':139 'connect':189 'convers':169 'cost':113 'cover':10,29 'data':11,30,55,171 'data-analytics' 'decim':133 'detail':196 'document':180 'embed':162 'enabl':44 'endpoint':16,35,53,66,94,149,151,205 'equal':126 'exchang':165 'export':172 'feed':164 'financ':13,32,60 'finance-data' 'flat':141 'geocod':167 'includ':156 'infrastructur':63 'key':84 'land':137,184 'learn':59 'limit':87 'list':98,148 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'maximum':112 'micropayment API' 'model':145 'network':77 'no-api-key' 'offer':48 'page':138,181,185 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,70,128 'per-request':69 'per-request-pricing' 'platform':6,25,46,135,155 'point':179 'post':105 'post-endpoint' 'premium':100 'price':144,163,178 'prompt':191 'protocol':81 'rate':86,166 'request':71,106 'request/response':200 'requir':91 'return':186 'schema':201 'sentiment':157 'set':51 'span':54 'specif':93,204 'subscript':90 'summar':160 'technic':195 'text':159 'unit':118 'unknown':207 'usdc':9,28,73,120,130 'usdc-base' 'use':72,131 'util':15,34,64 'utility-services' 'valid':168 'via':78 'wallet':190 'web3':61 'x402':43,80,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e181e380-56b1-4e12-8905-6781df796ecc","listingId":"e7048e91-79d9-4891-9732-de686d1553ab","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:39.869Z"}],"sources":[{"listingId":"e7048e91-79d9-4891-9732-de686d1553ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:39.869Z","lastSeenAt":"2026-04-22T18:04:32.897Z"}],"details":{"listingId":"e7048e91-79d9-4891-9732-de686d1553ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/40 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat $0.02/request pricing, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 USDC base units (=$0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/40"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/40"},{"claim":"Available endpoint categories include Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand access to analytics, AI, or financial data without managing API keys","Paying per-call for sentiment analysis, summarization, or text classification","Fetching real-time crypto gas estimates or token quotes via micropayment","Geocoding or data validation without a subscription commitment"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers prototyping with multiple utility endpoints at low cost","x402-compatible wallets and agent frameworks on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.243Z"},"updatedAt":"2026-04-22T18:04:32.897Z"}}