{"id":"778b5339-8138-4f75-a761-94abb1464d50","shortId":"YPJfgd","kind":"x402","title":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","tagline":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically `/api/v1/emails/11`) using the x402 payment protocol. It is live and returns a 402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals), settled to an on-chain address.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, 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 $0.02 per request with no API keys, no rate limits, and no commitments required. Payment is handled entirely via the x402 protocol on the Base L2 network using USDC.\n\nHowever, the specific `/api/v1/emails/11` endpoint is not listed on the site's landing page among the advertised APIs, and no documentation describes what data it returns or what input it expects beyond a POST request with `application/json` response. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Because of this lack of documentation for the specific endpoint and the platform generally, the exact behavior and response schema remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-data","pay-per-request","no-api-key","json-response"],"categories":["data","email"],"synonyms":["email API","pay-per-call API","x402 email endpoint","USDC micropayment API","Base network API","lowpaymentfee email","premium email data"],"warnings":["The /api/v1/emails/11 endpoint is not listed among the advertised APIs on the landing page — its purpose and response format are unknown.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no actual content.","No request body schema or response schema is available for this endpoint.","The endpoint's relationship to email data is inferred solely from the URL path; actual functionality is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/11","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/emails/11","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 for the /emails/11 resource, no request/response schema, and the docs/pricing/API pages are empty beyond a wallet connect prompt. The specific endpoint isn't even listed on the landing page. This is effectively a stub 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'/call':17,34 '0.02':16,33,77,140 '000':79 '20':78 '402':62 '6':85 'Base network API' 'USDC micropayment API' 'access':42 'address':93 'advertis':98,185 'ai':110 'among':183 'analysi':114 'analyt':109 'api':41,106,145,186,211 'application/json':205 'base':9,26,70,80,164 'base-network' 'behavior':240 'beyond':200 'broader':95 'chain':92 'challeng':63 'classif':116 'commit':152 'connect':217 'content':223 'convers':133 'cost':73 'data':6,23,108,192 'decim':86 'describ':190 'doc':208 'document':189,229 'email':5,22,46 'email API' 'email-data' 'email-rel':45 'embed':117 'endpoint':7,24,36,136,173,233 'entir':157 'estim':127 'exact':239 'exchang':122 'expect':199 'feed':121 'financ':118 'gas':126 'general':237 'generat':134 'geocod':131 'handl':156 'howev':169 'infrastructur':129 'input':197 'json-response' 'key':146 'l2':165 'lack':227 'land':181 'learn':112 'limit':149 'list':138,176 'live':58 'lowpaymentfee email' 'lowpaymentfee.com':38,96 'machin':111 'network':71,166 'no-api-key' 'on-chain':90 'page':182,212 'pay':2,19,103 'pay-per-call API' 'pay-per-request':1,18,102 'payment':54,65,154 'per':3,20,74,104,141 'platform':97,236 'post':202 'premium':40 'premium email data' 'price':120,209 'prompt':219 'protocol':55,161 'provid':39 'quot':125 'rate':123,148 'relat':47 'remain':244 'render':214 'request':4,21,75,105,142,203 'requir':64,153 'resourc':48 'respons':206,242 'return':60,194 'schema':243 'sentiment':113 'settl':12,29,87 'site':179 'span':107 'specif':49,171,232 'suit':100 'summar':115 'token':124 'unclear':245 'unit':81 'usdc':14,31,67,83,168 'usdc-settlement' 'use':51,167 'util':130 'valid':132 'via':10,27,158 'wallet':218 'web3':119 'x402':11,28,53,160 'x402 email endpoint' 'x402-payment'","prices":[{"id":"0fca11ab-616d-4d84-ae17-9b117dcff8c7","listingId":"778b5339-8138-4f75-a761-94abb1464d50","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/emails/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.503Z"}],"sources":[{"listingId":"778b5339-8138-4f75-a761-94abb1464d50","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.503Z","lastSeenAt":"2026-04-22T13:32:09.087Z"}],"details":{"listingId":"778b5339-8138-4f75-a761-94abb1464d50","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/11 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/emails/11"},{"claim":"All APIs are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/11"}],"useCases":["Retrieving email-related data on a per-request payment basis without needing an API key","Agent-driven workflows that need to fetch email records and can pay per call via x402","Integrating low-cost email data lookups into automated pipelines on Base"],"bestFor":["Developers or agents who want keyless, pay-per-use email data access","x402-compatible clients on the Base network","Low-volume or bursty usage patterns where subscription pricing is wasteful"],"notFor":["High-volume email processing where per-request costs add up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.154Z"},"updatedAt":"2026-04-22T13:32:09.087Z"}}