{"id":"4fd0383e-e797-4f22-a623-24d312c19429","shortId":"sxf8nw","kind":"x402","title":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","tagline":"Pay-per-request email data endpoint on Base via x402, settled in USDC at $0.02/call.","description":"This endpoint at `/api/v1/emails/97` 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/97` is labeled \"Premium API Access\" and accepts POST requests. Based on the x402 challenge, the maximum amount required is 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals).\n\nThe platform advertises a uniform $0.02/request pricing model with no API keys, no rate limits, no minimums, and instant access. However, the `/emails/97` endpoint is not listed among the publicly advertised API categories on the landing page (which covers analytics, AI, finance, and utilities). There is no documentation describing what this specific email endpoint returns — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without schema details or documentation for the email resource, the actual data returned by this endpoint is unknown.\n\nPayment is handled via the x402 exact scheme: callers must include an `X-PAYMENT` header with a valid payment proof. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","post-endpoint"],"categories":["data"],"synonyms":["email API","premium email access","x402 email endpoint","pay-per-call email","lowpaymentfee email","USDC API","Base network API"],"warnings":["The /api/v1/emails/97 endpoint is not listed among the publicly advertised APIs on the landing page — its purpose and output are undocumented.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The 'email' category may involve personal data — verify compliance with applicable privacy regulations before use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/97","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/97","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 402 challenge, confirming pricing and payment details. However, there is no documentation, no request/response schema, and the /emails/97 resource is not listed among the site's advertised APIs. The actual data returned is completely unknown, making this effectively a stub 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'/call':17,34 '/emails/97':81,142 '/request':125 '0.02':16,33,112,124 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':237 '0x8335':107 '20':101 '300':242 '402':253 '6':117 'Base network API' 'USDC API' 'accept':88 'access':86,139 'actual':202 'address':236 'advertis':121,150 'ai':160 'ai/ml':58 'among':147 'amount':98 'analyt':57,159 'api':54,85,130,151,179 'base':9,26,75,91,103,109,239 'base-network' 'caller':218 'categori':152 'challeng':95,254 'collect':48 'connect':185 'content':191 'cover':158 'data':6,23,56,203 'decim':118 'describ':168 'detail':194 'direct':234 'doc':176 'document':167,196 'email':5,22,172,199 'email API' 'email-data' 'endpoint':7,24,36,64,143,173,207,246 'equal':111 'exact':216 'financ':59,161 'handl':212 'header':225 'howev':140 'includ':220 'infrastructur':60 'instant':138 'key':131 'label':83 'land':155 'limit':134 'list':146 'live':248 'lowpaymentfee email' 'lowpaymentfee.com':43 'maximum':97 'minimum':136 'model':127 'must':219 'network':76 'offer':46 'page':156,180 'part':40 'pay':2,19,51 'pay-per-call email' 'pay-per-request':1,18,50 'payment':68,210,224,229,232 'per':3,20,52,113 'platform':44,120 'post':89 'post-endpoint' 'premium':84 'premium email access' 'price':126,177 'prompt':187 'proof':230 'proper':252 'protocol':69 'public':149 'rate':133 'render':182 'request':4,21,53,90,114 'requir':99 'resourc':79,200 'return':174,204,250 'schema':193 'scheme':217 'second':243 'settl':12,29,70 'span':55 'specif':78,171 'timeout':244 'uniform':123 'unit':104 'unknown':209 'usdc':14,31,72,106,115 'usdc-settlement' 'use':65,116 'util':163 'valid':228 'via':10,27,213 'wallet':186 'without':192 'x':223 'x-payment':222 'x402':11,28,67,94,215 'x402 email endpoint' 'x402-payment'","prices":[{"id":"e115085a-aa15-49a7-a1a3-889531ba66f7","listingId":"4fd0383e-e797-4f22-a623-24d312c19429","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:13.256Z"}],"sources":[{"listingId":"4fd0383e-e797-4f22-a623-24d312c19429","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:13.256Z","lastSeenAt":"2026-04-25T11:33:15.554Z"}],"details":{"listingId":"4fd0383e-e797-4f22-a623-24d312c19429","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/97 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/emails/97"},{"claim":"Payment directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/emails/97"},{"claim":"The /emails/97 endpoint is not among the publicly listed API categories on the landing page","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving email-related data on a per-request payment basis","Agent-driven data access without API key provisioning","Programmatic access to premium email content via crypto micropayment"],"bestFor":["Agents or services that need keyless, pay-as-you-go API access","Developers already holding USDC on Base who want frictionless API calls","Automated workflows requiring on-demand email data without subscription commitments"],"notFor":["Users who need detailed documentation or schema guarantees before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:19.621Z"},"updatedAt":"2026-04-25T11:33:15.554Z"}}