{"id":"fcf68dd6-1e8d-4a84-99b6-1f6a3cdaa420","shortId":"Zjnc9R","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 endpoint at `/api/v1/emails/64` 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. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific resource at `/api/v1/emails/64` is listed under \"Premium API Access\" but its exact functionality is not well-documented — the path suggests it returns email-related data for a specific record (ID 64), though no schema or example response is provided by the provider.\n\nThe endpoint is live and returns a valid x402 challenge. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 `exact` scheme to the specified wallet address. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to your POST request.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples provided by the site. The endpoint's purpose must be inferred entirely from its URL path and the generic \"Premium API Access\" description.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-data","pay-per-request","no-api-key","http-post"],"categories":["data"],"synonyms":["email API","email lookup","email data endpoint","x402 email","pay-per-call email","lowpaymentfee email","USDC email API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No request or response schema provided; the purpose of /api/v1/emails/64 is inferred solely from the URL path.","The endpoint is not listed on the provider's homepage among the advertised API categories, raising questions about its status.","No OpenAPI specification or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/64","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/64","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, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schema, no examples, and the docs pages are empty. The endpoint's actual functionality (what email data it returns, what input it expects) cannot be confirmed from available 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'/call':17,34 '0.02':16,33,146 '000':137 '20':136 '6':142 '64':111 'USDC email API' 'access':87,173,240 'addit':205 'address':161 'advertis':164 'ai/ml':58 'analyt':57 'api':54,86,166,192,239 'attach':176 'base':9,26,75,138 'base-network' 'challeng':132 'collect':48 'connect':200 'content':206 'data':6,23,56,105 'decim':143 'descript':241 'doc':190 'document':96,185 'email':5,22,103 'email API' 'email data endpoint' 'email lookup' 'email-data' 'email-rel':102 'endpoint':7,24,36,64,124,224 'entir':230 'equal':145 'exact':90,155 'exampl':116,218 'extrem':187 'financ':59 'function':91 'generic':237 'header':180 'http-post' 'id':110 'infer':229 'infrastructur':60 'instant':172 'key':167 'limit':170 'list':83 'live':126 'lowpaymentfee email' 'lowpaymentfee.com':43 'made':151 'must':227 'network':76 'no-api-key' 'offer':46 'openapi':210 'page':195 'part':40 'path':98,234 'pay':2,19,51 'pay-per-call email' 'pay-per-request':1,18,50 'payment':68,149,179 'per':3,20,52,147 'platform':44,163 'post':183 'premium':85,238 'price':134,191 'prompt':202 'protocol':69 'provid':119,122,219 'purpos':226 'rate':169 'readm':194 'record':109 'relat':104 'render':197 'request':4,21,53,148,184 'request/response':213 'resourc':79 'respons':117 'return':101,128 'schema':114,214 'scheme':156 'settl':12,29,70 'simpli':175 'site':222 'span':55 'spars':188 'spec':211 'specif':78,108 'specifi':159 'suggest':99 'though':112 'unit':139 'url':233 'usag':217 'usdc':14,31,72,141 'usdc-settlement' 'use':65 'valid':130 'via':10,27,152 'wallet':160,201 'well':95 'well-docu':94 'x402':11,28,67,131,154,178 'x402 email' 'x402-payment'","prices":[{"id":"fd258b3e-391a-4f14-893d-3becee1bbe78","listingId":"fcf68dd6-1e8d-4a84-99b6-1f6a3cdaa420","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.436Z"}],"sources":[{"listingId":"fcf68dd6-1e8d-4a84-99b6-1f6a3cdaa420","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.436Z","lastSeenAt":"2026-04-25T15:33:11.568Z"}],"details":{"listingId":"fcf68dd6-1e8d-4a84-99b6-1f6a3cdaa420","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/64 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/64"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/64"}],"useCases":["Retrieving email-related data for a specific record via a single paid request","Agent-driven workflows that need email data without managing API keys or subscriptions","Programmatic access to email information settled instantly on Base L2"],"bestFor":["Agents or scripts that need one-off email data lookups without subscription overhead","Developers experimenting with x402 payment-gated APIs","Use cases where no-API-key, no-rate-limit access is preferred"],"notFor":["Bulk email operations requiring thousands of calls (no documented batch support)","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.742Z"},"updatedAt":"2026-04-25T15:33:11.568Z"}}