{"id":"873a75d2-847c-41a8-ae28-ee6e5e505022","shortId":"JJ7eCk","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 x402-enabled endpoint at `/api/v1/emails/38` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (contract 0x8335…2913) with no API keys, no rate limits, and no subscriptions required — just an x402 payment header per request.\n\nThe specific endpoint `/api/v1/emails/38` is listed under \"Premium API Access\" but its exact functionality is not well-documented. The path suggests it returns or processes email-related data for a resource identified by ID 38. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform advertises uniform $0.02 pricing across all endpoints, with categories including analytics/metrics, AI sentiment analysis, text summarization, classification, embeddings, finance/price feeds, exchange rates, crypto gas estimates, geocoding, validation, conversion, and generation utilities. Documentation pages exist but appear to require wallet connection and contain no visible content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-data","pay-per-request","no-api-key","post-method"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","lowpaymentfee","micropayment API","Base network API"],"warnings":["No documentation available — all doc pages require wallet connection and show no content","The exact functionality of /api/v1/emails/38 is unknown; the path and description provide no detail beyond 'Premium API Access'","No request body schema or response schema documented","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/38","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/38","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 on what the /emails/38 endpoint actually returns, no request/response schema, and the docs pages are empty (wallet-gated). The exact purpose of this specific endpoint is 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'/call':17,34 '0.02':16,33,161,181 '000':152 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '0x8335':77 '20':151 '2913':78 '300':172 '38':133 '6':157 'Base network API' 'USDC API' 'accept':142 'access':106 'across':183 'address':168 'advertis':179 'ai':190 'ai/ml':61 'analysi':192 'analyt':60 'analytics/metrics':189 'api':57,81,105 'appear':214 'base':9,26,72,153 'base-network' 'broader':176 'call':67 'categori':187 'challeng':136 'classif':195 'collect':51 'confirm':137 'connect':218 'contain':220 'content':223 'contract':76 'convers':206 'crypto':201 'data':6,23,59,126 'decim':158 'document':115,210 'email':5,22,124 'email API' 'email-data' 'email-rel':123 'embed':196 'enabl':38 'endpoint':7,24,39,99,139,185 'equal':160 'estim':203 'exact':109 'exchang':199 'exist':212 'feed':198 'financ':62 'finance/price':197 'function':110 'gas':202 'generat':208 'geocod':204 'header':94 'id':132 'identifi':130 'includ':188 'infrastructur':63 'key':82 'limit':85 'list':102 'live':141 'lowpaymentfee' 'lowpaymentfee.com':46,177 'made':166 'maximum':148 'micropayment API' 'network':73 'no-api-key' 'offer':49 'page':211 'paid email endpoint' 'part':43 'path':117 'pay':2,19,54 'pay-per-request':1,18,53 'payment':93,149,164 'per':3,20,55,95,162 'platform':47,178 'post':143 'post-method' 'premium':104 'price':182 'process':122 'rate':84,200 'relat':125 'request':4,21,56,96,144,163 'requir':89,146,216 'resourc':129 'return':120 'second':173 'sentiment':191 'settl':12,29,69 'span':58 'specif':98 'subscript':88 'suggest':118 'summar':194 'text':193 'timeout':174 'uniform':180 'unit':154 'usdc':14,31,75,156 'usdc-settlement' 'use':74 'util':209 'valid':205 'via':10,27 'visibl':222 'wallet':217 'well':114 'well-docu':113 'x402':11,28,37,92,135 'x402 email' 'x402-enabled':36 'x402-payment'","prices":[{"id":"2afb208d-e520-4297-b3c8-ff76723af056","listingId":"873a75d2-847c-41a8-ae28-ee6e5e505022","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.779Z"}],"sources":[{"listingId":"873a75d2-847c-41a8-ae28-ee6e5e505022","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.779Z","lastSeenAt":"2026-04-22T12:05:01.330Z"}],"details":{"listingId":"873a75d2-847c-41a8-ae28-ee6e5e505022","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/38 \\\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 endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/38"},{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/38"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/emails/38"}],"useCases":["Retrieving email-related data on a per-request payment basis without API key management","Integrating pay-as-you-go email data into agent workflows using x402 protocol","Accessing premium email information settled via USDC on Base L2"],"bestFor":["Agents or developers wanting keyless, pay-per-call email data access","Workflows that need on-chain payment settlement for API calls","Users who prefer no subscriptions or rate limits"],"notFor":["Bulk email operations requiring thousands of calls at volume discounts","Users who need detailed API documentation before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.728Z"},"updatedAt":"2026-04-22T12:05:01.330Z"}}