{"id":"4a92a490-d5c9-4f3c-a8c0-b15e86c2ef4e","shortId":"63uZmE","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 x402-enabled endpoint at `/api/v1/emails/69` 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 (USD Coin) at a cost of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — payment is handled inline via the x402 protocol's `X-PAYMENT` header.\n\nThe specific endpoint probed (`/api/v1/emails/69`) is listed under the title \"Premium API Access\" but its exact functionality is not documented in the crawled material. The site's landing page does not list an emails category among its publicly advertised API groups (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), so the precise data returned by this endpoint is unclear. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (6 decimals → $0.02) per call on the Base network.\n\nThe broader lowpaymentfee.com platform advertises uniform $0.02 pricing across all endpoints with no minimums or commitments. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","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":["The /api/v1/emails/69 endpoint is not listed among the publicly advertised API categories on the landing page — its exact functionality is unknown.","All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is available; the output of this endpoint cannot be verified without making a paid call.","The 'email' category and the resource ID '69' suggest this may return a specific email record, but this is speculative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/69","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/69","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 of what this email endpoint actually returns, no request/response schema, and the docs pages are empty. The endpoint's purpose must be entirely inferred from its URL 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'/docs':217 '/pricing':218 '/readme':219 '/request':17,34 '0.02':16,33,82,192,205 '000':185 '20':184 '6':190 'Base network API' 'USDC micropayment API' 'accept':176 'access':123 'across':207 'advertis':149,203 'ai':154 'ai/ml':61 'among':146 'analyt':60,153 'api':57,89,122,150 'base':9,26,72,186,197 'base-network' 'broader':200 'call':4,21,67,194 'categori':145 'challeng':171 'charg':180 'coin':77 'collect':51 'commit':97,214 'confirm':172 'connect':223 'content':229 'cost':80 'crawl':133 'data':6,23,59,152,162 'decim':191 'detail':231 'document':130,215 'email':5,22,144 'email API' 'email-data' 'enabl':38 'endpoint':7,24,39,113,166,209 'exact':126 'financ':62,156 'function':127 'group':151 'handl':100 'header':110 'infrastructur':63,158 'inlin':101 'key':90 'land':138 'limit':93 'list':117,142 'live':175 'lowpaymentfee' 'lowpaymentfee.com':46,201 'materi':134 'maximum':182 'minimum':212 'ml':155 'network':73,198 'no-api-key' 'offer':49 'page':139,216 'part':43 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':53 'payment':98,109 'per':3,20,55,83,193 'platform':47,86,202 'post':177 'precis':161 'premium':121 'premium email access' 'price':206 'probe':114 'prompt':225 'protocol':105 'public':148 'rate':92 'request':56,84,178 'request/response':232 'requir':87 'return':163,220 'schema':233 'settl':12,29,69 'site':136 'span':58 'specif':112 'substant':228 'titl':120 'unavail':235 'unclear':168 'uniform':204 'unit':187 'upfront':96 'usd':76 'usdc':14,31,75,189 'usdc-settlement' 'use':74 'via':10,27,102 'wallet':224 'web3':157 'x':108 'x-payment':107 'x402':11,28,37,104,170 'x402 email endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"12eb948c-4408-40c5-8404-bb899d328aa4","listingId":"4a92a490-d5c9-4f3c-a8c0-b15e86c2ef4e","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.519Z"}],"sources":[{"listingId":"4a92a490-d5c9-4f3c-a8c0-b15e86c2ef4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.519Z","lastSeenAt":"2026-04-22T07:32:11.249Z"}],"details":{"listingId":"4a92a490-d5c9-4f3c-a8c0-b15e86c2ef4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/69 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/69"},{"claim":"The platform advertises $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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/69"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven workflows that need email data without managing API keys","Programmatic access to email records with crypto micropayments"],"bestFor":["Developers wanting keyless, pay-as-you-go email data access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["High-volume bulk email operations where per-call pricing is expensive","Users who need detailed API documentation and response schemas before integrating","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.631Z"},"updatedAt":"2026-04-22T07:32:11.249Z"}}