{"id":"186f7f2f-e3ad-41af-a37b-3391553762cc","shortId":"88bQHQ","kind":"x402","title":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated email data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/emails/27` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs settled on the Base network using USDC. The specific resource at `/emails/27` is labeled \"Premium API Access\" and returns JSON data via HTTP POST. Payment is handled inline via the x402 protocol — no API keys, accounts, or rate limits are required. Each request costs $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all at the same $0.02-per-request price point. However, the specific `/api/v1/emails/27` endpoint does not appear in the site's publicly listed API catalog, and no documentation describes what data it returns. The endpoint is confirmed live (returns a valid 402 x402 challenge), but without schema details, example responses, or documentation, the exact payload and use case remain unclear. The \"emails\" path segment suggests it may return email-related data (e.g., a specific email record or template), but this is speculative.\n\nPayment is settled on Base mainnet to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a 300-second timeout for payment completion.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["data"],"synonyms":["email API","premium email data","x402 email endpoint","pay-per-call email","lowpaymentfee email","crypto-paid API"],"warnings":["The /api/v1/emails/27 endpoint is not listed in the provider's public API catalog — its purpose and response format are undocumented.","No output schema or example response is available; the actual payload is unknown.","Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no useful content.","The 'emails' resource category is not described anywhere on the site."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/27","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/27","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 there is no documentation, no output schema, no example responses, and the /emails/27 path is not listed in the site's public API catalog. The actual data returned is unknown, making this effectively a stub 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'/emails/27':61 '0.02':10,24,94,125 '000':96 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':213 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':216 '20':95 '300':222 '402':163 '6':102 'access':66 'account':85 'address':212 'advertis':108 'ai':113 'analyt':112 'api':49,65,83,145 'appear':138 'base':8,22,53,97,209 'base-network' 'broader':105 'case':179 'catalog':146 'categori':109 'challeng':165,219 'collect':40 'complet':227 'confirm':158 'cost':93 'crypto-paid API' 'data':5,19,70,111,152,193 'decim':103 'describ':150 'detail':169 'document':149,173 'e.g':194 'email':4,18,183,191,197 'email API' 'email-rel':190 'endpoint':6,20,30,135,156 'exact':175 'exampl':170 'financ':116 'gate':3,17 'handl':76 'howev':131 'http':72 'includ':110 'infrastructur':119 'inlin':77 'json':69 'json-response' 'key':84 'label':63 'learn':115 'limit':88 'list':144 'live':159 'lowpaymentfee email' 'lowpaymentfee.com':37,106 'machin':114 'mainnet':210 'may':188 'network':54 'no-api-key' 'part':34 'path':184 'pay':9,23,46 'pay-per-call email' 'pay-per-request':45 'payload':176 'payment':74,205,226 'per':11,25,47,127 'per-request':126 'platform':38,107 'point':130 'post':73 'premium':64 'premium email data' 'price':129 'protocol':44,81 'public':143 'rate':87 'record':198 'relat':192 'remain':180 'request':12,26,48,92,128 'requir':90 'resourc':59 'respons':171 'return':68,154,160,189 'schema':168 'second':223 'segment':185 'settl':50,207 'site':141 'specif':58,133,196 'specifi':220 'specul':204 'suggest':186 'templat':200 'timeout':224 'unclear':181 'unit':98 'usdc':14,28,56,100,215 'usdc-settlement' 'use':55,178,214 'util':120 'valid':162 'via':71,78 'web3':117 'without':167 'x402':2,16,43,80,164,218 'x402 email endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"b92a9e9e-85eb-437b-ac7a-ec2a8f9a6b1f","listingId":"186f7f2f-e3ad-41af-a37b-3391553762cc","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.052Z"}],"sources":[{"listingId":"186f7f2f-e3ad-41af-a37b-3391553762cc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.052Z","lastSeenAt":"2026-04-25T17:33:18.961Z"}],"details":{"listingId":"186f7f2f-e3ad-41af-a37b-3391553762cc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/27 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/27"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/27"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/emails/27 path does not appear in the site's listed API catalog","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven data fetching without pre-registration or API keys","Programmatic access to premium content gated by micropayment"],"bestFor":["Agents or scripts that need keyless, pay-as-you-go API access","Developers experimenting with x402 protocol integrations","Use cases requiring no rate limits or subscription commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume bulk email operations where per-request pricing is inefficient","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.42Z"},"updatedAt":"2026-04-25T17:33:18.961Z"}}