{"id":"6a4bb431-c6dc-42e9-bb55-8332671fbf35","shortId":"hfUMKj","kind":"x402","title":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","tagline":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","description":"This x402-enabled endpoint at `/api/v1/emails/22` 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/22`) is listed as \"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 advertised flat pricing of $0.02/request across all endpoints. Payment is made 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/22` endpoint actually returns. The endpoint path suggests email-related data retrieval (possibly fetching a specific email record by ID), but this is speculative. The platform advertises categories like analytics, AI, finance, and infrastructure utilities, but this particular endpoint's category and response format are undocumented.","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","premium email access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of /api/v1/emails/22 is undocumented; 'Premium API Access' is a generic label","Cannot verify what data is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/22","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/22","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 ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, no description of what the endpoint actually does beyond the generic label 'Premium API Access'. The function of /api/v1/emails/22 is 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'/call':17,34 '/request':143 '0.02':16,33,130,142 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':77 '20':120 '2913':78 '300':155 '6':126 'Base network API' 'USDC micropayment API' 'accept':109 'access':107 'across':144 'actual':196 'address':151 'advertis':138,221 'ai':225 'ai/ml':61 'amount':118 'analyt':60,224 'api':57,81,106,165 'base':9,26,72,122 'base-network' 'call':67 'categori':222,235 'challeng':114 'collect':51 'confirm':115 'connect':173 'consist':133 'content':179 'contract':76 'data':6,23,59,205 'decim':127 'descript':190 'doc':163 'document':158 'email':5,22,203,211 'email API' 'email-data' 'email-rel':202 'enabl':38 'endpoint':7,24,39,99,146,195,199,233 'equal':129 'exampl':187 'extrem':160 'fetch':208 'financ':62,226 'flat':139 'format':238 'header':94 'id':214 'infrastructur':63,228 'key':82 'like':223 'limit':85 'list':103 'lowpaymentfee' 'lowpaymentfee.com':46 'made':149 'max':117 'network':73 'no-api-key' 'offer':49 'openapi':183 'page':168 'part':43 'particular':232 'path':200 'pay':2,19,54 'pay-per-call API' 'pay-per-request':1,18,53 'payment':93,147 'per':3,20,55,95,131 'platform':47,220 'possibl':207 'post':110 'premium':105 'premium email access' 'price':140,164 'probe':100 'prompt':175 'rate':84 'readm':167 'record':212 'relat':204 'render':170 'request':4,21,56,96,111,132 'request/response':186 'requir':89 'respons':237 'retriev':206 'return':197 'schema':184 'second':156 'settl':12,29,69 'site':136 'span':58 'spars':161 'specif':98,210 'specul':218 'subscript':88 'suggest':201 'timeout':157 'undocu':240 'unit':123 'usdc':14,31,75,125 'usdc-settlement' 'use':74 'util':229 'via':10,27 'wallet':174 'x402':11,28,37,92,113 'x402 email endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"0350f3cb-5103-4172-97d5-e5b5a7ae2aa1","listingId":"6a4bb431-c6dc-42e9-bb55-8332671fbf35","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.078Z"}],"sources":[{"listingId":"6a4bb431-c6dc-42e9-bb55-8332671fbf35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.078Z","lastSeenAt":"2026-04-22T10:02:44.840Z"}],"details":{"listingId":"6a4bb431-c6dc-42e9-bb55-8332671fbf35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/22 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/22"},{"claim":"The platform advertises $0.02/request flat pricing 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/22"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis","Integrating pay-per-use email data into agent workflows without API key management","Programmatic access to email records settled via crypto micropayments"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","Use cases requiring crypto-native micropayment settlement on Base","Quick integration without subscription commitments"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume use cases where per-request pricing may add up","Anyone requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.37Z"},"updatedAt":"2026-04-22T10:02:44.840Z"}}