{"id":"6362759a-42d8-4fb5-92e7-52adff714075","shortId":"vybqqx","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/transactions/60` is labeled \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific functionality of the `/api/v1/transactions/60` endpoint is not documented beyond its \"Premium API Access\" label, and the crawled documentation pages returned only a wallet-connect prompt with no further detail.\n\nPayments settle on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests and returns `application/json`. The x402 challenge was successfully captured, confirming the endpoint is live.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact functionality of /api/v1/transactions/60 is not documented — 'Premium API Access' is the only description available.","All documentation, pricing, and README pages returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many API categories (AI, finance, data, infrastructure) but none have detailed docs — actual capabilities are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/60","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/60","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 the specific endpoint's functionality is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect stub. The endpoint's purpose beyond the generic 'Premium API Access' label is 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'/request':13,28,145 '0.02':12,27,65,144 '000':69 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':190 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':194 '20':68 '6':75 'Base network API' 'USDC API' 'accept':46,197 'access':62,163 'account':80 'address':189 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,162 'application/json':202 'attach':88 'base':8,23,51,70,185 'beyond':159 'broader':97 'call':4,19,67 'caller':86 'captur':208 'categori':102 'challeng':205 'classif':118 'confirm':209 'connect':175 'contract':193 'convers':135 'cost':64 'crawl':167 'crypto-paid API' 'data':104,108 'decim':76 'detail':180 'document':158,168 'embed':119 'endpoint':55,138,155,196,211 'estim':129 'exchang':124 'export':109 'feed':123 'financ':120 'function':151 'gas':128 'generat':136 'geocod':133 'header':92 'howev':148 'includ':103 'infrastructur':131 'insight':110 'json-api' 'key':79 'l2':186 'label':59,164 'learn':113 'limit':83 'list':140 'live':213 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'metric':106 'micropayment API' 'multipl':100 'network':9,24,52,187 'no-api-key' 'page':169 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,91,181 'per':3,18,36,66 'platform':6,21,39,98 'point':147 'post':198 'post-method' 'premium':60,161 'premium API access' 'price':122,146 'prompt':176 'protocol':44 'quot':127 'rate':82,125 'report':107 'request':37,95,199 'requir':85 'return':170,201 'sentiment':114 'settl':182 'simpli':87 'specif':54,150 'success':207 'summar':117 'text':116 'token':126 'unit':71 'usdc':15,30,47,73,192 'usdc-base' 'use':41,191 'util':132 'valid':134 'via':10,25 'wallet':174 'wallet-connect':173 'web3':121 'x402':11,26,43,90,204 'x402 API' 'x402-payment'","prices":[{"id":"407a97a7-cb38-470e-a4fa-673d3fa0c71c","listingId":"6362759a-42d8-4fb5-92e7-52adff714075","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:59.175Z"}],"sources":[{"listingId":"6362759a-42d8-4fb5-92e7-52adff714075","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:59.175Z","lastSeenAt":"2026-04-23T08:31:56.058Z"}],"details":{"listingId":"6362759a-42d8-4fb5-92e7-52adff714075","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/60 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/transactions/60"},{"claim":"Platform lists $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/transactions/60"}],"useCases":["Programmatic access to premium API data without needing an account or API key","Agent-driven workflows that pay per request using USDC on Base","Accessing transaction-related data via a single HTTP POST call"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","Use cases requiring low-cost per-request pricing ($0.02)","Crypto-native applications already operating on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based pricing models","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.38Z"},"updatedAt":"2026-04-23T08:31:56.058Z"}}