{"id":"a1ceddab-2b66-452b-a1c7-d3d2f081bac7","shortId":"kZ2NCf","kind":"x402","title":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a pay-per-request \"Premium API Access\" resource at the path /api/v1/emails/14. It is part of a broader platform offering dozens of x402-gated API endpoints spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint /api/v1/emails/14 accepts POST requests and returns application/json. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The max amount required is 20,000 base units, which at 6 decimals equals $0.02 USD per call. The x402 challenge was confirmed live, returning a proper 402 with payment parameters.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no explanation of what the /api/v1/emails/14 resource actually returns. The endpoint name suggests email-related data (possibly a specific email record by ID), but this is speculative. Prospective callers should be aware that the lack of documentation makes integration uncertain.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","json-response","no-api-key"],"categories":["data","email"],"synonyms":["email API","paid email endpoint","x402 email","USDC API","Base network API","lowpaymentfee","micropayment API","pay-per-call email"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only a wallet-connect prompt","No OpenAPI or request/response schema provided; the actual data returned by /api/v1/emails/14 is unknown","The purpose of the 'emails/14' resource is unclear — it may be a demo or placeholder endpoint","Cannot verify what data is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/14","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/14","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 OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no clarity on what /api/v1/emails/14 actually returns. This is effectively a stub 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'/api/v1/emails/14':52,96,192 '/docs':160 '/pricing':162 '/readme':164 '/request':17,34 '0.02':16,33,80,134 '000':126 '0x8335':113 '20':125 '2913':114 '402':147 '6':131 'Base network API' 'USDC API' 'accept':97 'access':47 'actual':194 'ai/ml':71 'amount':122 'analyt':70 'api':46,66,85 'application/json':102 'awar':219 'base':9,26,108,127 'base-network' 'beyond':152 'broader':58 'call':4,21,137 'caller':216 'challeng':140 'commit':92 'confirm':142 'connect':170 'contract':112 'data':6,23,69,203 'decim':132 'detail':177 'document':151,224 'dozen':61 'email':5,22,201,207 'email API' 'email-data' 'email-rel':200 'endpoint':7,24,36,67,95,197 'equal':133 'exact':118 'explan':188 'extrem':157 'finance/web3':73 'gate':65 'id':210 'infer':72 'infrastructur':75 'integr':226 'json-response' 'key':86 'lack':222 'land':154 'limit':89 'live':143 'lowpaymentfee' 'lowpaymentfee.com':38 'make':225 'max':121 'micropayment API' 'name':198 'network':109 'no-api-key' 'offer':60 'openapi':181 'page':155,165 'paid email endpoint' 'paramet':150 'part':55 'path':51 'pay':2,19,42 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':41 'payment':103,149 'per':3,20,43,81,136 'platform':59 'possibl':204 'post':98 'premium':45 'price':78 'prompt':172 'proper':146 'prospect':215 'provid':39 'rate':88 'record':208 'relat':202 'render':167 'request':44,82,99 'request/response':184 'requir':123 'resourc':48,193 'return':101,144,195 'schema':185 'scheme':119 'settl':12,29,105 'span':68 'spars':158 'spec':182 'specif':94,206 'specul':214 'suggest':199 'technic':176 'uncertain':227 'unit':128 'usd':135 'usdc':14,31,111 'usdc-settlement' 'use':110 'util':76 'via':10,27,115 'wallet':171 'x402':11,28,64,117,139 'x402 email' 'x402-gated':63 'x402-payment'","prices":[{"id":"18493eaf-fd88-43ab-9e85-650340834dcd","listingId":"a1ceddab-2b66-452b-a1c7-d3d2f081bac7","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.503Z"}],"sources":[{"listingId":"a1ceddab-2b66-452b-a1c7-d3d2f081bac7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.503Z","lastSeenAt":"2026-04-22T13:32:09.054Z"}],"details":{"listingId":"a1ceddab-2b66-452b-a1c7-d3d2f081bac7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/14 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/14"},{"claim":"All endpoints are priced at $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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/14"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven workflows that need email data without API key provisioning","Programmatic access to email records settled via crypto micropayments"],"bestFor":["Agents or bots that can settle x402 payments in USDC on Base","Use cases requiring keyless, pay-as-you-go API access","Low-volume or sporadic email data lookups at $0.02 each"],"notFor":["High-volume email operations where per-call pricing is inefficient","Users who need detailed API documentation and request/response schemas before integrating","Non-crypto workflows that cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.177Z"},"updatedAt":"2026-04-22T13:32:09.054Z"}}