{"id":"0582087d-762e-4e79-819b-dd2fa23fc2f4","shortId":"z3UQEu","kind":"x402","title":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to email attachments (specifically for email ID 40) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access. However, the specific endpoint being listed here — `/api/v1/emails/40/attachments` — is not documented on the site's landing page among the advertised APIs, so its exact functionality and response schema are unclear.\n\nThe x402 challenge was successfully captured (HTTP 402 with a valid accepts block), confirming the endpoint is live. The payment is routed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. No OpenAPI spec, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","email-attachments","usdc-base","micropayment","post-json"],"categories":["email","storage"],"synonyms":["email attachment API","fetch email attachments","x402 email","paid email API","lowpaymentfee email","attachment download API"],"warnings":["This specific endpoint (/api/v1/emails/40/attachments) is not listed among the provider's advertised APIs on the landing page — its purpose and output are unclear.","No OpenAPI spec, request schema, or response schema available.","Documentation pages (/docs, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The endpoint appears to reference a hardcoded email ID (40); generalizability to other email IDs is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/40/attachments","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/40/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, this specific email attachments endpoint is not listed among the site's advertised APIs, there is no OpenAPI spec, no documentation, no example request/response schemas, and the crawled docs/pricing/README pages returned only 'Connect wallet' with no useful content. The purpose and data returned are largely 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'0.02':10,22,60,72,105 '000':66 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':174 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':177 '20':65 '40':38 '402':157 '6':70 'accept':44,161 'access':30,119 'address':173 'advertis':110,139 'ai':94 'among':137 'analyt':93 'api':90,112,140 'attach':3,15,33 'attachment download API' 'base':8,20,57,67,179 'behind':39 'block':162 'broader':79 'call':62 'captur':155 'challeng':152 'confirm':163 'crawl':192 'data':92 'decim':71 'detail':183 'document':130,184 'email':2,14,32,36 'email attachment API' 'email-attachments' 'endpoint':26,74,123,165 'exact':143 'exampl':186 'fetch email attachments' 'financ':97 'found':189 'function':144 'gate':89 'howev':120 'http':156 'id':37 'infrastructur':100 'instant':118 'json':49 'key':113 'land':135 'learn':96 'limit':116 'list':125 'live':167 'lowpaymentfee email' 'lowpaymentfee.com':28,81 'machin':95 'maxamountrequir':63 'micropay':6,18 'micropayment' 'network':58 'offer':83 'openapi':181 'page':136 'paid email API' 'part':76 'payment':50,169 'paywal':42 'per':11,23,61,106 'platform':80,109 'post':45 'post-json' 'price':103 'provid':29 'rate':115 'request':12,24,46,107 'respons':146,187 'retriev':1,13 'return':48 'rout':171 'schema':147 'settl':52 'site':133 'span':91 'spec':182 'specif':34,122 'success':154 'unclear':149 'unit':68 'usdc':54,176 'usdc-base' 'use':175 'util':101 'valid':160 'varieti':85 'via':4,16 'web3':98 'x402':5,17,41,88,151 'x402 email' 'x402-gated':87 'x402-payment'","prices":[{"id":"0c67fa7e-a993-44ac-8b48-4b6742695757","listingId":"0582087d-762e-4e79-819b-dd2fa23fc2f4","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/40/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:11.148Z"}],"sources":[{"listingId":"0582087d-762e-4e79-819b-dd2fa23fc2f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/40/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.148Z","lastSeenAt":"2026-04-22T02:31:49.279Z"}],"details":{"listingId":"0582087d-762e-4e79-819b-dd2fa23fc2f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/40/attachments \\\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 x402 challenge returns maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/40/attachments"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/40/attachments"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not include an emails endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving attachments from a specific email record via programmatic API call","Agent-driven workflows that need to fetch email attachment data with per-call micropayments","Integrating email attachment retrieval into automated pipelines without API key management"],"bestFor":["Agents needing on-demand email attachment access with no subscription","Developers experimenting with x402 micropayment-gated APIs","Low-volume, pay-per-use email data retrieval"],"notFor":["Bulk email processing or high-volume attachment downloads (no documented batch support)","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.302Z"},"updatedAt":"2026-04-22T02:31:49.279Z"}}