{"id":"1b11a3fa-ca23-41dc-abc0-5f4e2f88fa23","shortId":"6QyvUH","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 endpoint at `/api/v1/emails/94` 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 `/emails/94` is labeled \"Premium API Access\" and accepts POST requests. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader platform advertises a uniform $0.02/request pricing model with no API keys, no rate limits, no minimums, and instant access. However, the `/emails/94` endpoint is not listed among the publicly advertised API categories on the landing page (which covers analytics, AI, finance, and utility endpoints). The exact functionality of this specific email endpoint is unclear — no documentation, request schema, or response schema is available. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI spec, no request/response schema, and no documentation describing what this endpoint actually does or what input it expects, agents should treat this as a minimally documented endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational and accepts payment, but the actual behavior behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","post-endpoint"],"categories":["data","email"],"synonyms":["email API","premium email access","x402 email endpoint","pay-per-call email","lowpaymentfee email","USDC email API","Base network API"],"warnings":["No request or response schema available — input format is unknown","The /api/v1/emails/94 endpoint is not listed among the provider's publicly advertised APIs","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content","Exact functionality of this email endpoint is undocumented and cannot be verified without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/94","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational. However, there is no documentation, no request/response schema, no OpenAPI spec, and the /emails/94 path is not even listed on the provider's own landing page. The actual functionality behind the paywall is completely 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'/emails/94':81,131 '/request':17,34,114 '0.02':16,33,104,113 '000':95 '20':94 '6':100 'Base network API' 'USDC email API' 'accept':88,239 'access':86,128 'actual':208,243 'advertis':110,139 'agent':215 'ai':149 'ai/ml':58 'among':136 'analyt':57,148 'api':54,85,119,140,176 'avail':172 'base':9,26,75,96 'base-network' 'behavior':244 'behind':245 'broader':108 'call':4,21 'categori':141 'challeng':226 'collect':48 'confirm':233 'connect':185 'content':191 'cover':147 'crawl':174 'data':6,23,56 'decim':101 'describ':204 'doc':175 'document':165,203,222 'email':5,22,160 'email API' 'email-data' 'endpoint':7,24,36,64,132,153,161,207,223,235 'equal':103 'exact':155 'expect':214 'financ':59,150 'form':232 'function':156 'howev':129 'infrastructur':60 'input':212 'instant':127 'key':120 'label':83 'land':144 'limit':123 'list':135 'live':228 'lowpaymentfee email' 'lowpaymentfee.com':43 'minim':221 'minimum':125 'model':116 'network':76 'offer':46 'openapi':196 'oper':237 'page':145,180 'part':40 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':50 'payment':68,240 'paywal':247 'per':3,20,52,105 'platform':44,109 'post':89 'post-endpoint' 'premium':84 'premium email access' 'price':92,115,177 'prompt':187 'protocol':69 'public':138 'rate':122 'readm':179 'request':53,90,106,166 'request/response':199 'resourc':79 'respons':169 'return':182 'schema':167,170,200 'settl':12,29,70 'span':55 'spec':197 'specif':78,159 'substant':190 'treat':217 'unclear':163 'uniform':112 'unit':97 'unknown':249 'usdc':14,31,72,99 'usdc-settlement' 'use':65 'util':152 'via':10,27 'wallet':186 'well':231 'well-form':230 'x402':11,28,67,225 'x402 email endpoint' 'x402-payment'","prices":[{"id":"dd56a2d3-bec2-4f63-af1a-32b9fcdea7d7","listingId":"1b11a3fa-ca23-41dc-abc0-5f4e2f88fa23","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:13.235Z"}],"sources":[{"listingId":"1b11a3fa-ca23-41dc-abc0-5f4e2f88fa23","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:13.235Z","lastSeenAt":"2026-04-22T02:31:51.582Z"}],"details":{"listingId":"1b11a3fa-ca23-41dc-abc0-5f4e2f88fa23","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/94 \\\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","source_url":"https://lowpaymentfee.com/api/v1/emails/94"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/94"},{"claim":"The /emails/94 endpoint is not listed among the publicly advertised API categories on the landing page","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email-related data behind a micropayment wall","Agent-driven email data access without API keys","Programmatic pay-per-use email queries settled in USDC on Base"],"bestFor":["Agents needing keyless, pay-per-call email data access","Developers experimenting with x402 payment protocol integrations","Use cases requiring no-commitment, no-rate-limit API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based email APIs with clear SLAs","Anyone needing detailed documentation before calling an endpoint"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:19.635Z"},"updatedAt":"2026-04-22T02:31:51.582Z"}}