{"id":"a4a03fd4-55bf-4e16-ad1f-133689de6ea4","shortId":"HPceEV","kind":"x402","title":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to an email-related resource (specifically /api/v1/emails/56) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms the endpoint is live, accepting POST requests with an exact payment scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is granted purely through per-request micropayments.\n\nThe specific functionality of the /api/v1/emails/56 endpoint is not documented beyond the generic label \"Premium API Access.\" The platform's docs, pricing, and README pages all render only a wallet-connect prompt with no further technical documentation or schema details. Without additional documentation it is unclear what input the POST body expects or what the response payload contains. The broader site lists many endpoint categories but provides no OpenAPI spec, example requests, or response schemas for any of them.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","email-data","micropayment","no-api-key"],"categories":["data","email"],"synonyms":["email API","premium email endpoint","x402 email","lowpaymentfee","pay-per-call email","USDC micropayment API","Base network API"],"warnings":["No documentation available — docs, pricing, and README pages all show only a wallet-connect prompt","The specific functionality of /api/v1/emails/56 is undocumented; 'Premium API Access' is the only description","No OpenAPI spec, request schema, or response schema provided","No example requests or responses available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/56","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the purpose of /api/v1/emails/56 is entirely opaque. The docs and other pages render only a wallet-connect prompt. This is effectively a stub 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'0.02':10,24,80,125 '000':116 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':93 '20':115 '6':121 'Base network API' 'USDC micropayment API' 'accept':102 'access':36,134,159 'addit':185 'advertis':133 'ai':69 'amount':112 'analyt':68 'api':35,64,127,158 'base':8,22,88,117 'beyond':153 'bodi':194 'broader':55,203 'call':63 'categori':208 'challeng':96 'confirm':97 'connect':174 'contain':201 'contract':92 'data':5,19,67 'decim':122 'detail':183 'doc':163 'document':152,180,186 'dozen':58 'email':4,18,40 'email API' 'email-data' 'email-rel':39 'endpoint':6,20,30,65,99,149,207 'equal':124 'exact':107 'exampl':214 'expect':195 'financ':72 'function':145 'gate':3,17 'generic':155 'grant':136 'infrastructur':75 'input':191 'key':128 'label':156 'learn':71 'limit':131 'list':205 'live':101 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':70 'mani':206 'maximum':111 'micropay':142 'micropayment' 'network':89 'no-api-key' 'offer':57 'openapi':212 'page':167 'part':52 'pay':9,23,61 'pay-per-cal':60 'pay-per-call email' 'pay-per-request' 'payload':200 'payment':48,83,108 'per':11,25,62,81,140 'per-request':139 'platform':56,161 'post':103,193 'premium':34,157 'premium email endpoint' 'price':78,164 'prompt':175 'protocol':49 'provid':33,210 'pure':137 'rate':130 'readm':166 'relat':41 'render':169 'request':12,26,82,104,141,215 'requir':113 'resourc':42 'respons':199,217 'schema':182,218 'scheme':109 'settl':85 'site':204 'span':66 'spec':213 'specif':43,144 'technic':179 'unclear':189 'unit':118 'usdc':14,28,91,120 'usdc-base' 'use':90 'util':76 'via':45 'wallet':173 'wallet-connect':172 'web3':73 'without':184 'x402':2,16,47,95 'x402 email' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"21092537-ce63-447d-8501-0c072179e12f","listingId":"a4a03fd4-55bf-4e16-ad1f-133689de6ea4","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.291Z"}],"sources":[{"listingId":"a4a03fd4-55bf-4e16-ad1f-133689de6ea4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.291Z","lastSeenAt":"2026-04-22T07:01:53.641Z"}],"details":{"listingId":"a4a03fd4-55bf-4e16-ad1f-133689de6ea4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/56 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/56"},{"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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/56"}],"useCases":["Fetching email-related data on a per-request payment basis without needing an API key","Integrating pay-per-call email data into agent workflows via x402 protocol","Programmatic access to email resources settled in USDC on Base"],"bestFor":["Agents or developers who want keyless, per-request access to email data","x402-compatible clients looking for low-cost micropayment endpoints","Workflows that need on-demand email data without subscription commitments"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume batch email processing where per-request pricing is inefficient","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.965Z"},"updatedAt":"2026-04-22T07:01:53.641Z"}}