{"id":"e505c1fd-afb9-4ac1-ab6e-51d79d4817c7","shortId":"qBmjZZ","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/transactions/380` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The maxAmountRequired of 20000 base units corresponds to $0.02 (USDC uses 6 decimals). The timeout is 300 seconds. No detailed documentation, request/response schemas, or examples are available for this specific endpoint beyond the generic listing.\n\nNote: The exact functionality of `/api/v1/transactions/380` is unclear — it is not listed among the advertised endpoints on the homepage. It may be a transaction-specific resource or an internal endpoint. The platform's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid endpoint"],"warnings":["The specific endpoint /api/v1/transactions/380 is not listed among the platform's advertised APIs — its functionality is unclear.","No documentation, request schema, or response schema is available for this endpoint.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/380","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/380","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint path is not listed among advertised APIs. The purpose of /api/v1/transactions/380 is 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'/request':13,28 '0.02':12,27,76,123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20000':118 '300':131 '6':126 'Base network API' 'USDC micropayment API' 'accept':103 'access':7,22,38 'advertis':164 'ai':63 'among':162 'analyt':62 'api':6,21,37,88,187 'avail':141 'base':9,24,84,114,119 'base-network' 'beyond':146 'call':4,19 'categori':59 'challeng':97 'commit':93 'confirm':98 'connect':193 'content':199 'contract':111 'correspond':121 'crypto-paid endpoint' 'data':61 'decim':127 'detail':134 'doc':184 'document':135 'endpoint':32,52,72,100,145,165,180 'exact':152 'exampl':139 'financ':66 'function':153 'generic':148 'homepag':168 'includ':60 'infrastructur':69 'intern':179 'key':89 'learn':65 'limit':91 'list':149,161 'live':102 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':64 'mani':51 'maxamountrequir':116 'may':170 'network':85 'no-api-key' 'note':150 'offer':53 'one':49 'page':188 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':79 'payment':42,108 'per':3,18,77 'platform':56,182 'post':104 'post-method' 'premium':5,20,36 'price':74,185 'prompt':195 'protocol':43 'provid':35 'rate':90 'render':190 'request':78,105 'request/response':136 'requir':94 'resourc':176 'schema':137 'second':132 'settl':107 'span':58 'specif':45,144,175 'timeout':129 'transact':174 'transaction-specif':173 'unclear':157 'unit':120 'usdc':15,30,81,110,124 'usdc-settlement' 'use':125 'util':70 'via':10,25,39 'wallet':194 'web3':67 'x402':11,26,41,96 'x402 API' 'x402-payment'","prices":[{"id":"95fde691-a4c8-47ce-9122-087cf10a273e","listingId":"e505c1fd-afb9-4ac1-ab6e-51d79d4817c7","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/380","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:31.941Z"}],"sources":[{"listingId":"e505c1fd-afb9-4ac1-ab6e-51d79d4817c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/380","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:31.941Z","lastSeenAt":"2026-04-22T07:01:37.772Z"}],"details":{"listingId":"e505c1fd-afb9-4ac1-ab6e-51d79d4817c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/380 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network, maxAmountRequired 20000 base units (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/380"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoints","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints via x402 protocol"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","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 guaranteed SLAs","Anyone without access to USDC on the Base network","High-volume use cases where per-request pricing may be costly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.674Z"},"updatedAt":"2026-04-22T07:01:37.772Z"}}