{"id":"f123e63b-5fdb-4f64-80d7-ebe0a4d81979","shortId":"hsHNpQ","kind":"x402","title":"Pay-per-call audit logs endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call audit logs endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to audit log data (specifically log ID 81) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-payment scheme.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/audit/logs/81` is listed as \"Premium API Access\" in the x402 challenge. The maxAmountRequired is 20000 base units of USDC (6 decimals), which equals $0.02. The x402 challenge was successfully captured with version 1, confirming the endpoint is live. Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail, so the request/response schema is unknown beyond what the x402 challenge provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","audit-logs","pay-per-call","no-api-key","json-response"],"categories":["data","infrastructure"],"synonyms":["audit log API","pay-per-request API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.","Request and response schemas are completely unknown; no OpenAPI spec or examples provided.","The specific resource '/api/v1/audit/logs/81' purpose is unclear — 'Premium API Access' is a generic label that does not describe the data returned.","This endpoint is not listed on the provider's own homepage among their advertised APIs, raising questions about its intended use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/audit/logs/81","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/audit/logs/81","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 pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of 'audit/logs/81' is opaque — it is unclear what data is returned or what inputs are accepted beyond POST with a payment 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'/request':17,34 '0.02':16,33,133,173 '0x8335':71 '1':182 '20000':164 '2913':72 '6':169 '81':48 'Base network API' 'USDC micropayment API' 'accept':55 'access':40,156 'ai/ml':101 'analysi':104 'analyt':100 'api':97,138,155,197 'audit':5,22,42 'audit log API' 'audit-logs' 'base':9,26,66,165 'base-network' 'beyond':220 'broader':85 'call':4,21,96 'captur':179 'challeng':160,176,224 'classif':106 'commit':146 'confirm':183 'connect':206 'contract':70 'convers':123 'crypto':110 'crypto-paid API' 'data':44,99,111 'decim':170 'detail':213 'doc':196 'document':188 'embed':107 'endpoint':7,24,36,80,126,149,185 'equal':172 'estim':117 'exact':76 'exact-pay':75 'exchang':114 'extrem':193 'feed':113 'financ':108 'gas':116 'generat':124 'geocod':121 'id':47 'infer':102 'infrastructur':119 'json':60 'json-response' 'key':139 'limit':142 'list':152 'live':187 'log':6,23,43,46 'lowpaymentfee' 'lowpaymentfee.com':38,87 'maxamountrequir':162 'minimum':145 'network':67 'no-api-key' 'offer':89 'page':201 'part':82 'pay':2,19,94 'pay-per-cal':1,18,93 'pay-per-call' 'pay-per-request API' 'payment':52,61,77 'per':3,20,95,134 'platform':86,129 'post':56 'premium':154 'price':112,131,198 'prompt':208 'protocol':53 'provid':39,225 'rate':115,141 'readm':200 'render':203 'request':57,135 'request/response':216 'return':59 'schema':217 'scheme':78 'sentiment':103 'settl':12,29,63 'site':191 'span':98 'spars':194 'specif':45,148 'success':178 'summar':105 'technic':212 'unit':166 'unknown':219 'usdc':14,31,69,168 'usdc-settlement' 'use':68 'util':120 'valid':122 'varieti':91 'version':181 'via':10,27,49 'wallet':207 'x402':11,28,51,159,175,223 'x402 API' 'x402-payment'","prices":[{"id":"1312601d-0d06-47b6-8c00-eedf16f8651a","listingId":"f123e63b-5fdb-4f64-80d7-ebe0a4d81979","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/audit/logs/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:08.597Z"}],"sources":[{"listingId":"f123e63b-5fdb-4f64-80d7-ebe0a4d81979","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/audit/logs/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:08.597Z","lastSeenAt":"2026-04-27T05:04:23.611Z"}],"details":{"listingId":"f123e63b-5fdb-4f64-80d7-ebe0a4d81979","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/audit/logs/81 \\\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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/audit/logs/81"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/audit/logs/81"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving audit log entries on a per-call payment basis without needing an API key","Integrating pay-per-use audit data into agent workflows that settle payments in USDC on Base","Accessing structured audit log data programmatically with no subscription or rate limits"],"bestFor":["Agents or developers who want keyless, pay-per-call access to audit data","Use cases requiring on-chain USDC micropayments on Base L2","Low-volume or sporadic access patterns where subscription pricing is wasteful"],"notFor":["High-volume audit log consumers who need bulk pricing or batch exports","Users who cannot transact in USDC on the Base network","Anyone needing detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:28.242Z"},"updatedAt":"2026-04-27T05:04:23.611Z"}}