{"id":"4bc290cb-757c-47b2-abe3-6ed5cb110db5","shortId":"kDE57e","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/49` 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-chain via the x402 protocol using USDC on the Base network. The specific resource at `/emails/49` is labeled \"Premium API Access\" and accepts POST requests, returning `application/json` responses.\n\nThe x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network, with a 300-second timeout window. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\n\nThe exact functionality of the `/emails/49` endpoint is not documented in the crawled material. The provider's site lists many API categories (analytics, AI, finance, utilities) but does not include an explicit \"emails\" category or describe what this specific endpoint returns. The `49` in the path may refer to a specific email resource or template ID. Without further documentation, the precise behavior must be discovered by making a paid request. The docs, pricing, and README pages all returned 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":["email API","pay-per-call email","x402 email endpoint","USDC email API","Base network API","lowpaymentfee email","micropayment email"],"warnings":["No documentation exists for the /api/v1/emails/49 endpoint — its exact functionality is unknown","The provider's docs, pricing, and README pages contain no useful content (only 'Connect wallet')","The 'emails' category does not appear in the provider's listed API categories, raising questions about what this endpoint actually does","No request or response schema is available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /emails/49 endpoint specifically — no request schema, no response schema, no description of what it does. The docs/pricing/README pages are empty beyond a wallet connect prompt. The endpoint's purpose must be inferred or discovered by 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'/emails/49':85,163 '/request':17,34 '0.02':16,33,116 '000':111 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':130 '20':110 '300':137 '49':200 '6':121 'Base network API' 'USDC email API' 'accept':92 'access':90,149 'addit':243 'address':129 'advertis':148 'ai':181 'ai/ml':58 'analyt':57,180 'api':6,23,54,89,142,178 'application/json':96 'base':9,26,79,112,133 'base-network' 'behavior':219 'call':4,21,65 'categori':179,191 'chain':70 'challeng':100 'collect':48 'confirm':101 'connect':238 'content':244 'crawl':170 'data':56 'decim':122 'describ':193 'discov':222 'doc':229 'document':167,216 'email':5,22,190,209 'email API' 'email-api' 'endpoint':7,24,36,103,164,197 'exact':159 'explicit':189 'financ':59,182 'function':160 'gate':151 'header':157 'id':213 'includ':187 'infrastructur':60 'json-response' 'key':143 'label':87 'limit':146 'list':176 'live':105 'lowpaymentfee email' 'lowpaymentfee.com':43 'make':224 'mani':177 'materi':171 'maximum':108 'may':204 'micropayment email' 'must':220 'network':80,134 'no-api-key' 'offer':46 'on-chain':68 'page':233 'paid':226 'part':40 'path':203 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':50 'payment':125,156 'per':3,20,52,123 'platform':44 'post':93 'precis':218 'premium':88 'price':230 'prompt':240 'protocol':74 'provid':173 'pure':152 'rate':145 'readm':232 'refer':205 'request':53,94,124,227 'requir':106 'resourc':83,210 'respons':97 'return':95,198,235 'second':138 'sent':127 'settl':12,29,67 'sinc':118 'site':175 'span':55 'specif':82,196,208 'templat':212 'timeout':139 'unit':113 'usd':117 'usdc':14,31,76,115,119 'usdc-settlement' 'use':75,120 'util':61,183 'via':10,27,71 'wallet':239 'window':140 'without':214 'x402':11,28,73,99,155 'x402 email endpoint' 'x402-payment'","prices":[{"id":"7c418487-0d0f-4961-9b81-3dadc5f3577f","listingId":"4bc290cb-757c-47b2-abe3-6ed5cb110db5","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.206Z"}],"sources":[{"listingId":"4bc290cb-757c-47b2-abe3-6ed5cb110db5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.206Z","lastSeenAt":"2026-04-22T04:02:23.784Z"}],"details":{"listingId":"4bc290cb-757c-47b2-abe3-6ed5cb110db5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/49 \\\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 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/49"},{"claim":"The provider advertises $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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/49"},{"claim":"The provider lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure but not emails","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email data or templates via a single paid API call","Integrating pay-per-use email functionality into agent workflows","Accessing premium email content without subscription or API key management"],"bestFor":["Agents needing one-off email API access without signup","Developers who prefer crypto-native pay-per-call billing","Use cases requiring no rate limits or API key overhead"],"notFor":["High-volume email sending requiring bulk pricing","Users who need detailed documentation before committing to a call","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.241Z"},"updatedAt":"2026-04-22T04:02:23.784Z"}}