{"id":"a509d84f-715c-47ad-bc2b-577eff69d6c5","shortId":"EU4nXc","kind":"x402","title":"Pay-per-call email API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call email API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/emails/71` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML, finance, infrastructure utilities, and more. Each call is settled on the Base network using USDC via the x402 protocol — no API keys, no subscriptions, no rate limits. The specific resource at `/emails/71` is labeled \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live and requires a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the `/emails/71` endpoint actually returns or what input it expects. The endpoint's purpose (email-related data, email sending, or something else) cannot be determined from available material. Agents should treat this as a minimally documented endpoint until the provider publishes proper docs.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-api","no-api-key","post-method"],"categories":["email","api-marketplace"],"synonyms":["email API","pay-per-call email","x402 email endpoint","USDC email API","Base network API","lowpaymentfee email","micropayment email"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for this endpoint; request body and response format are unknown","The purpose of /api/v1/emails/71 is unclear — it could be email retrieval, sending, or something else entirely","No examples or sample responses provided by the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/71","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, no request/response schemas. The /docs and other pages are empty. This is effectively a stub 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'/api/v1/emails/71':38 '/docs':165 '/emails/71':90,197 '/pricing':166 '/readme':169 '/request':17,34,145 '0.02':16,33,132,144 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':120 '20':114 '2913':121 '300':157 '6':127 'Base network API' 'USDC email API' 'accept':97 'access':95 'across':146 'actual':199 'address':153 'advertis':140 'agent':225 'ai/ml':58 'analyt':57 'api':6,23,54,79,94 'avail':223 'base':9,26,70,116,123 'base-network' 'call':4,21,65 'cannot':219 'challeng':102 'collect':48 'confirm':103 'connect':175 'consist':135 'content':181 'data':56,213 'decim':128 'determin':221 'doc':239 'document':160,190,232 'els':218 'email':5,22,211,214 'email API' 'email-api' 'email-rel':210 'endpoint':7,24,36,105,148,198,207,233 'expect':205 'explan':193 'extrem':162 'financ':59 'flat':141 'infrastructur':60 'input':203 'key':80 'label':92 'limit':85 'live':107 'lowpaymentfee email' 'lowpaymentfee.com':43 'materi':224 'maximum':111 'micropayment email' 'minim':231 'network':71 'no-api-key' 'offer':46 'openapi':185 'page':170 'part':40 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':50 'payment':112,149 'per':3,20,52,133 'platform':44 'post':98 'post-method' 'premium':93 'price':142 'prompt':177 'proper':238 'protocol':77 'provid':236 'publish':237 'purpos':209 'rate':84 'relat':212 'render':172 'request':53,99,134 'request/response':188 'requir':109 'resourc':88 'return':200 'schema':189 'second':158 'send':215 'sent':151 'settl':12,29,67 'sinc':124 'site':138 'someth':217 'span':55 'spars':163 'spec':186 'specif':87 'subscript':82 'timeout':159 'translat':130 'treat':227 'unit':117 'usdc':14,31,73,119,125 'usdc-settlement' 'use':72,126 'util':61 'via':10,27,74 'wallet':176 'x402':11,28,76,101 'x402 email endpoint' 'x402-payment'","prices":[{"id":"551cd4c5-4f10-4529-a748-8026b45c703b","listingId":"a509d84f-715c-47ad-bc2b-577eff69d6c5","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.520Z"}],"sources":[{"listingId":"a509d84f-715c-47ad-bc2b-577eff69d6c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.520Z","lastSeenAt":"2026-04-22T05:31:59.671Z"}],"details":{"listingId":"a509d84f-715c-47ad-bc2b-577eff69d6c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/71 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/71"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/71"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or interacting with email-related data via a single paid API call","Integrating a no-signup, pay-per-use email endpoint into an agent workflow","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Agents needing a no-auth, pay-per-call email endpoint","Developers experimenting with x402 protocol payments on Base","Use cases where avoiding API key management is a priority"],"notFor":["Production email workflows requiring documented request/response schemas","High-volume email sending where bulk pricing matters","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.637Z"},"updatedAt":"2026-04-22T05:31:59.671Z"}}