{"id":"fd14bd6c-0ef2-44db-b7ba-6f910eb1a2d0","shortId":"w8tsgW","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 x402-enabled endpoint at `/api/v1/emails/12` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure, and more. Each call is settled on the Base network using USDC (contract 0x8335…2913) with no API keys, no rate limits, and no subscriptions required. The specific endpoint probed (`/api/v1/emails/12`) is labeled \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live, advertising a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 `exact` scheme to the payee address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout window.\n\nDocumentation is extremely sparse. The crawled docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/emails/12` endpoint actually returns. The endpoint path suggests email-related data (possibly a specific email record by ID), but the exact functionality cannot be confirmed from available material. The broader site lists many endpoint categories but provides no documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","email-data","no-api-key","post-method"],"categories":["data","email"],"synonyms":["email API","pay-per-call email","x402 email endpoint","USDC micropayment API","lowpaymentfee email","Base network API","crypto-paid email data"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The exact purpose of /api/v1/emails/12 is unclear — 'Premium API Access' is generic","Cannot verify what data is returned or what input the POST body expects","The broader site lists many endpoints but none appear documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what the endpoint actually does, no request/response schema, and the crawled pages are all empty beyond a wallet connect prompt. Effectively a stub 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'/call':17,34 '0.02':16,33,127 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x8335':77 '20':117 '2913':78 '300':145 '6':123 'Base network API' 'USDC micropayment API' 'accept':101 'access':99 'actual':189 'addit':170 'address':141 'advertis':112 'ai/ml':61 'amount':115 'analyt':60 'api':57,81,98,157 'avail':214 'base':9,26,72,119 'base-network' 'broader':217 'call':67 'cannot':210 'categori':222 'challeng':106 'confirm':107,212 'connect':165 'contract':76 'crawl':154 'crypto-paid email data' 'data':6,23,59,198 'decim':124 'descript':183 'detail':172 'doc':155 'document':149,226 'email':5,22,196,202 'email API' 'email-data' 'email-rel':195 'enabl':38 'endpoint':7,24,39,92,109,188,192,221 'equal':126 'exact':136,208 'extrem':151 'financ':62 'function':209 'id':205 'infrastructur':63 'key':82 'label':96 'limit':85 'list':219 'live':111 'lowpaymentfee email' 'lowpaymentfee.com':46 'made':132 'mani':220 'materi':215 'maximum':114 'network':73 'no-api-key' 'offer':49 'openapi':176 'page':160 'part':43 'path':193 'pay':2,19,54 'pay-per-call email' 'pay-per-request':1,18,53 'paye':140 'payment':130 'per':3,20,55,128 'platform':47 'possibl':199 'post':102 'post-method' 'premium':97 'price':156 'probe':93 'prompt':167 'provid':224 'rate':84 'readm':159 'record':203 'relat':197 'render':162 'request':4,21,56,103,129 'request/response':179 'requir':89 'return':190 'schema':180 'scheme':137 'second':146 'settl':12,29,69 'site':218 'span':58 'spars':152 'spec':177 'specif':91,201 'subscript':88 'suggest':194 'suit':51 'technic':171 'timeout':147 'unit':120 'usdc':14,31,75,122 'usdc-settlement' 'use':74 'via':10,27,133 'wallet':166 'window':148 'x402':11,28,37,105,135 'x402 email endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"1714b9cd-f52e-420e-91e2-b8cff0555b2f","listingId":"fd14bd6c-0ef2-44db-b7ba-6f910eb1a2d0","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.460Z"}],"sources":[{"listingId":"fd14bd6c-0ef2-44db-b7ba-6f910eb1a2d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.460Z","lastSeenAt":"2026-04-22T13:32:09.018Z"}],"details":{"listingId":"fd14bd6c-0ef2-44db-b7ba-6f910eb1a2d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/12 \\\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/12"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/12"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email-related data on a per-request payment basis without needing an API key","Agent-driven workflows that need to fetch email records and can pay per call via x402","Integrating low-cost email data lookups into crypto-native applications"],"bestFor":["Developers wanting zero-signup, pay-as-you-go email data access","AI agents with x402 payment capability on Base","Prototyping workflows that need cheap per-call email endpoints"],"notFor":["Production use cases requiring documented request/response schemas and SLAs","Users who need free or fiat-only payment options","High-volume batch email processing (no documented rate limits but no guarantees either)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.177Z"},"updatedAt":"2026-04-22T13:32:09.018Z"}}