{"id":"6ca4e28e-2f07-4b65-9a89-b8d6cb5fe2a6","shortId":"2kd5SK","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 x402-enabled endpoint at `/api/v1/emails/77` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (contract `0x8335…2913`) with no API keys, no rate limits, and no subscriptions required — just an x402 payment header per request.\n\nThe specific endpoint probed (`/api/v1/emails/77`) is listed under \"Premium API Access\" and accepts POST requests. The x402 challenge confirms a max amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request, consistent with the site's uniform $0.02/request pricing across all endpoints. The payment is directed 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 schema, no request/response examples, and no description of what the `/api/v1/emails/77` endpoint actually returns. The path suggests it retrieves or processes email-related data for a resource identified by ID 77, but the exact input parameters and output format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","email-data"],"categories":["data","email"],"synonyms":["email API","pay-per-call API","x402 email endpoint","USDC micropayment API","lowpaymentfee","Base network API","email data endpoint"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The purpose of /api/v1/emails/77 is unclear — 'Premium API Access' is a generic label applied to all endpoints","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/77","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/77","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 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the emails/77 endpoint actually does. The docs pages are all blank wallet-connect prompts. This is effectively a stub 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'/request':17,34,140 '0.02':16,33,130,139 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':77 '20':120 '2913':78 '300':154 '6':126 '77':214 'Base network API' 'USDC micropayment API' 'accept':109 'access':107 'across':142 'actual':195 'address':150 'ai/ml':61 'amount':118 'analyt':60 'api':57,81,106,164 'base':9,26,72,122 'base-network' 'call':4,21,67 'challeng':114 'collect':51 'confirm':115 'connect':172 'consist':133 'content':178 'contract':76 'data':6,23,59,207 'decim':127 'descript':189 'direct':148 'doc':162 'document':157 'email':5,22,205 'email API' 'email data endpoint' 'email-data' 'email-rel':204 'enabl':38 'endpoint':7,24,39,99,144,194 'equal':129 'exact':217 'exampl':186 'extrem':159 'financ':62 'format':222 'header':94 'id':213 'identifi':211 'infrastructur':63 'input':218 'key':82 'limit':85 'list':103 'lowpaymentfee' 'lowpaymentfee.com':46 'max':117 'network':73 'no-api-key' 'offer':49 'openapi':182 'output':221 'page':167 'paramet':219 'part':43 'path':198 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':53 'payment':93,146 'per':3,20,55,95,131 'platform':47 'post':110 'premium':105 'price':141,163 'probe':100 'process':203 'prompt':174 'rate':84 'readm':166 'relat':206 'render':169 'request':56,96,111,132 'request/response':185 'requir':89 'resourc':210 'retriev':201 'return':196 'schema':183 'second':155 'settl':12,29,69 'site':136 'span':58 'spars':160 'specif':98 'subscript':88 'suggest':199 'timeout':156 'uniform':138 'unit':123 'unknown':224 'usdc':14,31,75,125 'usdc-settlement' 'use':74 'via':10,27 'wallet':173 'x402':11,28,37,92,113 'x402 email endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"721dbca2-2033-4067-be1e-fa1cf3eadab6","listingId":"6ca4e28e-2f07-4b65-9a89-b8d6cb5fe2a6","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.558Z"}],"sources":[{"listingId":"6ca4e28e-2f07-4b65-9a89-b8d6cb5fe2a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.558Z","lastSeenAt":"2026-04-22T05:31:59.726Z"}],"details":{"listingId":"6ca4e28e-2f07-4b65-9a89-b8d6cb5fe2a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/77 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/emails/77"},{"claim":"Payment settled in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/emails/77"}],"useCases":["Retrieving email-related data on a per-request payment basis","Integrating pay-per-call email lookups into agent workflows","Accessing premium email data without API key management"],"bestFor":["Agents that need keyless, pay-as-you-go API access","Developers wanting to avoid subscription commitments for occasional email data requests","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.512Z"},"updatedAt":"2026-04-22T05:31:59.726Z"}}