{"id":"024538ee-ac21-477b-9836-5ce6e012f878","shortId":"DEw483","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/13` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities. The specific endpoint probed (`/api/v1/emails/13`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network in USDC (contract `0x8335…2913`) via the x402 exact-payment scheme.\n\nThe maximum amount required per call is 20,000 base units of USDC. Since USDC uses 6 decimals, this equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access; payment is the only gate.\n\nThe exact functionality of the `/api/v1/emails/13` resource is unclear from the crawl material. It does not appear in the site's listed API catalog (which covers analytics, AI, finance, and utility endpoints). The path suggests it may return or process email-related data keyed by ID 13, but no documentation, request schema, or response schema was found. The docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. Without further documentation, the precise input/output contract remains unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","post-method"],"categories":["data","email"],"synonyms":["email API","pay-per-call API","x402 email endpoint","USDC micropayment API","lowpaymentfee email","Base network API","premium email access"],"warnings":["No documentation found for /api/v1/emails/13 — all doc pages render only 'Connect wallet'","This endpoint is not listed in the site's own API catalog; its exact functionality is unknown","No request or response schema available; input/output contract must be discovered experimentally","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/13","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/13","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific endpoint, no request/response schema, and the crawled docs pages are empty. The endpoint path (/api/v1/emails/13) does not appear in the site's own catalog, making its purpose 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'/request':17,34,133 '0.02':16,33,120,132 '000':108 '0x8335':91 '13':201 '20':107 '2913':92 '6':116 'Base network API' 'USDC micropayment API' 'accept':78 'access':76,148 'across':134 'addit':228 'advertis':128,139 'ai':181 'ai/ml':62 'amount':102 'analyt':61,180 'api':58,75,141,176,214 'appear':170 'base':9,26,86,109 'base-network' 'broad':51 'call':4,21,105 'catalog':52,177 'connect':223 'consist':123 'content':229 'contract':90,236 'cover':179 'crawl':165 'data':6,23,60,197 'decim':117 'doc':213 'document':204,232 'email':5,22,195 'email API' 'email-data' 'email-rel':194 'enabl':38 'endpoint':7,24,39,69,136,185 'equal':119 'exact':97,155 'exact-pay':96 'financ':182 'finance/web3':63 'flat':129 'found':211 'function':156 'gate':153 'id':200 'infrastructur':65 'input/output':235 'instant':147 'key':142,198 'label':73 'limit':145 'list':175 'lowpaymentfee email' 'lowpaymentfee.com':46 'materi':166 'maximum':101 'may':190 'network':87 'offer':49 'page':218 'part':43 'path':187 'pay':2,19,55 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':54 'payment':81,98,149 'per':3,20,56,104,121 'platform':47,138 'post':79 'post-method' 'precis':234 'premium':74 'premium email access' 'price':130,215 'probe':70 'process':193 'prompt':225 'rate':144 'readm':217 'relat':196 'remain':237 'render':220 'request':57,80,122,205 'requir':103 'resourc':160 'respons':208 'return':191 'schema':206,209 'scheme':99 'settl':12,29,83 'sinc':113 'site':126,173 'span':59 'specif':68 'suggest':188 'unclear':162 'unit':110 'unknown':238 'usdc':14,31,89,112,114 'usdc-settlement' 'use':115 'util':66,184 'via':10,27,93 'wallet':224 'without':230 'x402':11,28,37,95 'x402 email endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"55e4861e-1468-4b24-ac85-cdd5e25f5dc2","listingId":"024538ee-ac21-477b-9836-5ce6e012f878","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.324Z"}],"sources":[{"listingId":"024538ee-ac21-477b-9836-5ce6e012f878","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.324Z","lastSeenAt":"2026-04-22T13:32:08.870Z"}],"details":{"listingId":"024538ee-ac21-477b-9836-5ce6e012f878","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/13 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/13"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/13"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven workflows that need email data without API key provisioning","Programmatic access to email resources with crypto micropayments"],"bestFor":["Agents or scripts that need keyless, pay-as-you-go email data access","Developers who prefer crypto micropayments over subscription billing","Automated pipelines on the Base L2 network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume email operations where per-request pricing is cost-inefficient","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.379Z"},"updatedAt":"2026-04-22T13:32:08.870Z"}}