{"id":"c08fc44c-fcf9-4f8e-9f5e-28ab51f898d7","shortId":"ZbH6Sh","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/45` 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 paid via the x402 protocol using USDC on the Base network, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint probed (`/api/v1/emails/45`) is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network, with a timeout of 300 seconds.\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 schema, no request/response examples, and no description of what the `/api/v1/emails/45` endpoint actually returns or what input it expects. The endpoint is live (returns a valid 402 challenge), but the exact functionality behind the email resource is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","email-api"],"categories":["email","data"],"synonyms":["email API","pay-per-call API","x402 email endpoint","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid email"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or input/output schema provided for this endpoint","The exact purpose and behavior of /api/v1/emails/45 is unknown from available material","The endpoint path suggests a specific email resource (ID 45) but no context is given"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network details. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The actual functionality of the /api/v1/emails/45 resource is entirely unknown, making this effectively a stub 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'/request':17,34 '0.02':16,33,115 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '20':109 '300':138 '402':192 '6':122 'Base network API' 'USDC micropayment API' 'accept':98 'access':96 'actual':178 'address':128 'ai/ml':58 'analyt':57 'api':6,23,54,80,95,147 'avail':206 'base':9,26,76,111,132 'base-network' 'behind':198 'call':4,21,65 'challeng':103,193 'collect':48 'connect':155 'content':161 'cost':107 'crypto-paid email' 'data':56 'decim':123 'descript':172 'doc':145 'document':140 'email':5,22,200 'email API' 'email-api' 'endpoint':7,24,36,89,177,186 'exact':196 'exampl':169 'expect':184 'extrem':142 'financ':59 'function':197 'indic':104 'infrastructur':60 'input':182 'key':81 'label':93 'limit':83 'live':188 'lowpaymentfee' 'lowpaymentfee.com':43 'materi':207 'maximum':106 'network':77,133 'no-api-key' 'offer':46 'openapi':165 'page':150 'paid':67 'part':40 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':50 'payment':124 'per':3,20,52,117 'platform':44 'post':99 'premium':94 'price':146 'probe':90 'prompt':157 'protocol':71 'rate':82 'readm':149 'render':152 'request':53,100,118 'request/response':168 'requir':86 'resourc':201 'return':179,189 'schema':166 'second':139 'sent':126 'settl':12,29 'sinc':119 'span':55 'spars':143 'specif':88 'subscript':85 'timeout':136 'unit':112 'unknown':203 'usd':116 'usdc':14,31,73,114,120 'usdc-settlement' 'use':72,121 'util':61 'valid':191 'via':10,27,68 'wallet':156 'x402':11,28,70,102 'x402 email endpoint' 'x402-payment'","prices":[{"id":"a10608a7-4fe3-44ef-851d-ee30bb903234","listingId":"c08fc44c-fcf9-4f8e-9f5e-28ab51f898d7","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.148Z"}],"sources":[{"listingId":"c08fc44c-fcf9-4f8e-9f5e-28ab51f898d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.148Z","lastSeenAt":"2026-04-22T10:02:44.887Z"}],"details":{"listingId":"c08fc44c-fcf9-4f8e-9f5e-28ab51f898d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/45 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/45"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USD Coin (USDC) on the Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/emails/45"}],"useCases":["Fetching or sending email data on a per-request payment basis","Integrating a no-signup, no-API-key email endpoint into agent workflows","Making micropayment-settled API calls from autonomous agents on Base"],"bestFor":["Agents needing a zero-friction, keyless email API","Developers who want to pay per call with USDC on Base","Workflows requiring no subscription or rate-limit constraints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume email operations where per-call pricing at $0.02 adds up quickly","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.248Z"},"updatedAt":"2026-04-22T10:02:44.887Z"}}