{"id":"b27936bf-21ea-4f49-846f-39fe10076066","shortId":"P8H9T6","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific endpoint `/api/v1/transactions/368` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform offers 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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality of the `/api/v1/transactions/368` endpoint is unclear from available documentation. The title \"Premium API Access\" is generic and no request/response schema details are provided beyond the x402 challenge metadata. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","no-api-key","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available for the specific /api/v1/transactions/368 endpoint beyond the generic title 'Premium API Access'","No request body schema or response schema documented","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The actual functionality delivered by this endpoint is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/368","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/368","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what this specific endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet connect 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'/request':16,34 '0.02':15,33,75,144 '000':60 '20':59 '6':67 'Base network API' 'USDC micropayment API' 'accept':54 'access':7,25,44,164 'addit':194 'ai':112 'analysi':116 'analyt':106 'api':6,24,43,90,102,163,183 'avail':158 'base':9,27,61,71 'beyond':174 'broader':97 'call':4,22 'categori':103 'challeng':177 'charg':58 'classif':119 'coin':66 'connect':189 'convers':136 'crypto-paid API' 'data':105,109 'decim':68 'detail':171 'doc':180 'document':159,196 'embed':120 'endpoint':38,52,139,154 'equal':74 'estim':130 'exchang':125 'export':110 'feed':124 'financ':121 'function':150 'gas':129 'generat':137 'generic':166 'geocod':134 'handl':80 'header':87 'howev':147 'http-post' 'includ':104 'infrastructur':132 'inlin':81 'insight':111 'key':91 'learn':114 'limit':94 'lowpaymentfee' 'lowpaymentfee.com':40,98 'machin':113 'metadata':178 'metric':107 'multipl':101 'network':10,28,72 'no-api-key' 'offer':100 'page':184 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,78,86 'per':3,21,76,145 'platform':99 'post':55 'premium':5,23,42,162 'premium API access' 'price':123,142,181 'prompt':191 'protocol':13,31,49 'provid':41,173 'quot':128 'rate':93,126 'render':186 'report':108 'request':56,77,146 'request/response':169 'requir':95 'schema':170 'sentiment':115 'specif':51,149 'summar':118 'technic':195 'text':117 'titl':161 'token':127 'unclear':156 'uniform':141 'unit':62 'usd':65 'usdc':18,36,64 'usdc-base-network' 'util':133 'valid':135 'via':11,29,45,82 'wallet':190 'web3':122 'x':85 'x-payment':84 'x402':12,30,47,176 'x402 endpoint' 'x402-payment'","prices":[{"id":"5b4d6ce9-2603-4c2f-8199-fc216dcd3de8","listingId":"b27936bf-21ea-4f49-846f-39fe10076066","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/368","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:30.687Z"}],"sources":[{"listingId":"b27936bf-21ea-4f49-846f-39fe10076066","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/368","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:30.687Z","lastSeenAt":"2026-04-22T13:31:51.682Z"}],"details":{"listingId":"b27936bf-21ea-4f49-846f-39fe10076066","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/368 \\\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 charges 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/368"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services without subscription or API key management","Making one-off paid API calls settled in USDC on Base L2","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers wanting zero-commitment pay-per-call API access","Agents that can settle payments in USDC on Base network","Users who prefer no-signup, no-rate-limit API consumption"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in crypto on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.746Z"},"updatedAt":"2026-04-22T13:31:51.682Z"}}