{"id":"0522dfdc-b507-4d9d-bcbd-d47e012a16d4","shortId":"Jy6xFK","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/86` 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/86` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live and requires a maximum of 20,000 base units of USDC (0.02 USD) per call.\n\nThe broader platform advertises a uniform $0.02 per request pricing model with no API keys, no rate limits, no minimums, and instant access. However, the `/api/v1/emails/86` endpoint is not listed among the publicly advertised API categories on the landing page (which covers analytics, AI, finance, and utility endpoints). There is no documentation describing what this specific email endpoint returns — the crawled docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content.\n\nWithout schema documentation or example responses, the exact data returned by this endpoint is unknown. The endpoint path suggests it retrieves or processes data related to a specific email resource (ID 86), but the nature of that data (validation, lookup, enrichment, etc.) cannot be confirmed from available materials. Agents should treat this as a low-documentation endpoint and test with caution.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","post-method"],"categories":["data","email"],"synonyms":["email API","email lookup","email endpoint","x402 email","pay-per-call email","USDC API","Base network API","lowpaymentfee"],"warnings":["Endpoint /api/v1/emails/86 is not listed among the provider's publicly advertised APIs — its purpose is undocumented.","No request body schema or response schema available; the exact data returned is unknown.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The nature of the email data (validation, enrichment, lookup, etc.) cannot be confirmed from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/86","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/86","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 request/response schema, and the endpoint is not listed on the provider's own landing page. The purpose of the /emails/86 resource is entirely 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'/emails/86':81 '/request':17,34 '0.02':16,33,109,119 '000':104 '20':103 '86':221 'Base network API' 'USDC API' 'accept':88 'access':86,135 'addit':188 'advertis':116,146 'agent':238 'ai':156 'ai/ml':58 'among':143 'analyt':57,155 'api':54,85,126,147 'avail':236 'base':9,26,75,105 'base-network' 'broader':114 'call':4,21,112 'cannot':232 'categori':148 'caution':251 'challeng':93 'collect':48 'confirm':94,234 'connect':183 'content':189 'cover':154 'crawl':173 'data':6,23,56,198,213,227 'describ':165 'doc':174 'document':164,192,246 'email':5,22,169,218 'email API' 'email endpoint' 'email lookup' 'email-data' 'endpoint':7,24,36,64,139,160,170,202,206,247 'enrich':230 'etc':231 'exact':197 'exampl':194 'financ':59,157 'howev':136 'id':220 'infrastructur':60 'instant':134 'key':127 'label':83 'land':151 'limit':130 'list':142 'live':97 'lookup':229 'low':245 'low-document':244 'lowpaymentfee' 'lowpaymentfee.com':43 'materi':237 'maximum':101 'minimum':132 'model':123 'natur':224 'network':76 'offer':46 'page':152,178 'part':40 'path':207 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':50 'payment':68 'per':3,20,52,111,120 'platform':44,115 'post':89 'post-method' 'premium':84 'price':122,175 'process':212 'prompt':185 'protocol':69 'public':145 'rate':129 'readm':177 'relat':214 'render':180 'request':53,90,121 'requir':99 'resourc':79,219 'respons':195 'retriev':210 'return':171,199 'schema':191 'settl':12,29,70 'span':55 'specif':78,168,217 'suggest':208 'test':249 'treat':240 'uniform':118 'unit':106 'unknown':204 'usd':110 'usdc':14,31,72,108 'usdc-settlement' 'use':65 'util':159 'valid':228 'via':10,27 'wallet':184 'without':190 'x402':11,28,67,92 'x402 email' 'x402-payment'","prices":[{"id":"391ffd16-237c-4476-962d-c69d135c2635","listingId":"0522dfdc-b507-4d9d-bcbd-d47e012a16d4","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:13.096Z"}],"sources":[{"listingId":"0522dfdc-b507-4d9d-bcbd-d47e012a16d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:13.096Z","lastSeenAt":"2026-04-22T02:31:51.444Z"}],"details":{"listingId":"0522dfdc-b507-4d9d-bcbd-d47e012a16d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/86 \\\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 x402 challenge confirms the endpoint is live, requires POST, and charges a maximum of 20,000 base units of USDC (asset 0x8335…) on Base.","source_url":"https://lowpaymentfee.com/api/v1/emails/86"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, no minimums, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure — but does not list any /emails/ endpoints.","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or processing email-related data on a per-call basis","Agent-driven workflows that need email data without API key management","Programmatic access to email resources with crypto micropayments"],"bestFor":["Agents needing keyless, pay-per-call email data access","Developers who want to pay in USDC on Base without subscriptions","Low-volume or sporadic email data lookups"],"notFor":["High-volume email operations where subscription pricing is more economical","Use cases requiring well-documented schemas and guaranteed SLAs","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:19.761Z"},"updatedAt":"2026-04-22T02:31:51.444Z"}}