{"id":"10932d5c-8d12-4644-965e-ac66b8f45ceb","shortId":"WBQN8E","kind":"x402","title":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated email endpoint on Base, pay $0.02 per request in USDC with no API keys.","description":"This endpoint at lowpaymentfee.com provides premium API access via the x402 payment protocol. The specific resource `/api/v1/emails/73` is part of a broader platform that offers dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 challenges on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, no minimums, and instant access. The x402 challenge was confirmed live, returning a well-formed 402 response with version 1 of the protocol and a 300-second payment timeout.\n\nThe specific functionality behind `/api/v1/emails/73` is not documented in the crawled material — the site's landing page lists analytics, AI, finance, and utility endpoints but does not mention an emails category. The endpoint's description field in the x402 challenge is simply \"Premium API Access,\" which is generic. Without further documentation or an OpenAPI spec, the exact request/response schema for this email-related resource is unknown. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-api","json-response","no-api-key"],"categories":["email","api-gateway"],"synonyms":["x402 email API","pay-per-call email","USDC email endpoint","Base network API","lowpaymentfee email","micropayment email API"],"warnings":["No documentation exists for the /api/v1/emails/73 endpoint — its exact functionality is unknown","The site's docs, pricing, and API pages all render only a 'Connect wallet' prompt with no useful content","No OpenAPI spec or request/response schema is available","The emails category does not appear in the site's listed API categories, raising questions about this endpoint's purpose"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/73","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/73","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 OpenAPI spec, no documentation for the /emails/73 resource, no request/response schema, and the docs pages are empty. The specific purpose of this email endpoint is entirely 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'0.02':9,26,115 '000':110 '0x8335':100 '1':151 '20':109 '2913':101 '300':157 '402':147 '6':120 'Base network API' 'USDC email endpoint' 'accept':88 'access':42,135,205 'addit':243 'advertis':124 'ai':180 'ai/ml':70 'analyt':69,179 'api':16,33,41,126,204,232 'base':7,24,84,103,111 'base-network' 'behind':79,164 'broader':56 'call':65 'categori':191 'challeng':81,138,200 'confirm':140 'connect':238 'content':244 'contract':99 'cost':107 'crawl':171 'crypto':73 'data':68 'decim':121 'descript':195 'doc':229 'document':168,211 'dozen':60 'email':4,21,190,223 'email-api' 'email-rel':222 'endpoint':5,22,36,66,87,184,193 'equal':114 'exact':217 'field':196 'financ':72,181 'form':146 'function':163 'gate':3,20,78 'generic':208 'infer':71 'instant':134 'json':93 'json-response' 'key':17,34,127 'land':176 'limit':130 'list':178 'live':141 'lowpaymentfee email' 'lowpaymentfee.com':38 'materi':172 'maximum':106 'mention':188 'micropayment email API' 'minimum':132 'network':85 'no-api-key' 'offer':59 'openapi':214 'page':177,233 'part':53 'pay':8,25,63 'pay-per-cal':62 'pay-per-call email' 'pay-per-request' 'payment':46,94,159 'per':10,27,64,116 'platform':57,123 'post':89 'premium':40,203 'price':230 'prompt':240 'protocol':47,154 'provid':39 'rate':129 'relat':224 'render':235 'request':11,28,90,117 'request/response':218 'resourc':50,225 'respons':148 'return':92,142 'schema':219 'second':158 'servic':76 'settl':96 'simpli':202 'site':174 'span':67 'spec':215 'specif':49,162 'timeout':160 'unit':112 'unknown':227 'usdc':13,30,98,118 'usdc-settlement' 'use':119 'util':75,183 'version':150 'via':43 'wallet':239 'well':145 'well-form':144 'without':209 'x402':2,19,45,80,137,199 'x402 email API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"d6296cae-f985-4020-a4ce-e079ebd66d75","listingId":"10932d5c-8d12-4644-965e-ac66b8f45ceb","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.477Z"}],"sources":[{"listingId":"10932d5c-8d12-4644-965e-ac66b8f45ceb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.477Z","lastSeenAt":"2026-04-22T04:02:25.245Z"}],"details":{"listingId":"10932d5c-8d12-4644-965e-ac66b8f45ceb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/73 \\\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 a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/73"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/73"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists analytics, AI/ML, finance, crypto, and utility endpoints but no emails category","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching or sending email data via a single paid API call without needing an API key","Agent-driven workflows that need email functionality with crypto micropayments","Integrating email capabilities into Web3 applications on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use email API access","AI agents that can settle x402 payments in USDC on Base","Prototyping workflows that need email data without long-term commitments"],"notFor":["High-volume email operations where per-request pricing adds up quickly","Users who need detailed API documentation and guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.639Z"},"updatedAt":"2026-04-22T04:02:25.245Z"}}