{"id":"a92a3e97-b39d-48ad-8a9a-5dd57a8063b6","shortId":"bMb2Cx","kind":"x402","title":"x402-gated email API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated email API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/emails/7` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs settled in USDC on the Base network. The specific endpoint is listed under \"Premium API Access\" and accepts POST requests. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base, and the server fulfills the request upon verification. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. However, this specific endpoint (`/api/v1/emails/7`) is not listed on the homepage's catalog and its exact functionality is unclear. The path suggests it may relate to email data retrieval or email-related operations, but no documentation, request schema, or response schema is available to confirm what it returns or what input it expects.\n\nThe endpoint is confirmed live: the probe received a proper 402 challenge with x402 version 1, specifying the USDC contract on Base (`0x8335...2913`) and a payTo address. No OpenAPI spec, no detailed docs, and no example responses were found. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-api","post-method"],"categories":["email","data"],"synonyms":["email endpoint","premium email API","x402 email","pay-per-call email","USDC email API","lowpaymentfee email"],"warnings":["Endpoint /api/v1/emails/7 is not listed in the provider's own homepage catalog of available APIs","No documentation, request schema, or response schema available — functionality is unknown","All doc/pricing/README pages return only 'Connect wallet' with no substantive content","The purpose of this specific endpoint (emails/7) cannot be verified from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/7","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the endpoint path (/api/v1/emails/7) does not appear in the site's own catalog. It is impossible to determine what this endpoint actually does beyond its generic 'Premium API Access' 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'0.02':10,24,116,140 '000':107 '0x8335':219 '1':212 '20':106 '2913':220 '402':207 '6':112 'USDC email API' 'accept':67 'access':65 'across':124 'address':224 'advertis':122 'ai':129 'amount':101 'analyt':128 'api':5,19,49,64,239 'avail':186 'base':8,22,55,90,108,218 'base-network' 'broader':119 'call':104 'caller':77 'catalog':155 'categori':126 'challeng':208 'collect':40 'confirm':188,200 'connect':248 'content':254 'contract':216 'data':127,170 'decim':113 'detail':229 'doc':230,238 'document':179 'email':4,18,169,174 'email endpoint' 'email-api' 'email-rel':173 'endpoint':6,20,30,59,123,146,198 'equal':115 'exact':158 'exampl':233 'expect':196 'financ':132 'found':236 'fulfil':94 'function':159 'gate':3,17 'handl':72 'header':83 'homepag':153 'howev':143 'includ':78 'infrastructur':135 'input':194 'learn':131 'list':61,150 'live':201 'lowpaymentfee email' 'lowpaymentfee.com':37,120 'machin':130 'maximum':100 'may':166 'network':56 'openapi':226 'oper':176 'page':243 'part':34 'path':163 'pay':9,23,46 'pay-per-call email' 'pay-per-request':45 'payment':70,82,88 'payto':223 'per':11,25,47,103,141 'platform':38,121 'post':68 'post-method' 'premium':63 'premium email API' 'price':138,240 'probe':203 'prompt':250 'proper':206 'protocol':44,76 'readm':242 'receiv':204 'relat':167,175 'request':12,26,48,69,96,142,180 'requir':102 'respons':183,234 'retriev':171 'return':191,245 'schema':181,184 'server':93 'settl':50 'sever':125 'sign':86 'spec':227 'specif':58,145 'specifi':213 'substant':253 'suggest':164 'unclear':161 'unit':109 'upon':97 'usd':117 'usdc':14,28,52,87,111,215 'usdc-settlement' 'util':136 'verif':98 'version':211 'via':73 'wallet':249 'web3':133 'x':81 'x-payment':80 'x402':2,16,43,75,210 'x402 email' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"4e456713-54ff-4870-938a-b7ecff8c278b","listingId":"a92a3e97-b39d-48ad-8a9a-5dd57a8063b6","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.562Z"}],"sources":[{"listingId":"a92a3e97-b39d-48ad-8a9a-5dd57a8063b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.562Z","lastSeenAt":"2026-04-22T05:31:59.726Z"}],"details":{"listingId":"a92a3e97-b39d-48ad-8a9a-5dd57a8063b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/7 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/7"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/7"},{"claim":"All listed APIs on the platform are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The homepage lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories but does not include /api/v1/emails/7","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email-related data via a single paid API call","Integrating pay-per-request email functionality into agent workflows","Accessing premium email content without API keys or subscriptions"],"bestFor":["Agents that need on-demand email data with no subscription commitment","Developers experimenting with x402 pay-per-request protocols","Use cases requiring keyless, instant-access API calls on Base"],"notFor":["High-volume email operations where per-call pricing is inefficient","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.513Z"},"updatedAt":"2026-04-22T05:31:59.726Z"}}