{"id":"4789f06a-2ade-4a00-804a-d6e4ffde6412","shortId":"CzRMXB","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 email ID 38) 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 broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point with no API keys, no rate limits, and no commitments.\n\nHowever, this specific endpoint (`/api/v1/emails/38/attachments`) is not listed among the advertised APIs on the landing page, and no documentation exists describing its request body schema, expected parameters, or response format. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. As a result, the actual functionality and data returned by this endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-json"],"categories":["storage","email"],"synonyms":["email attachment API","x402 email endpoint","paid email access","Base USDC micropayment","lowpaymentfee email"],"warnings":["This specific endpoint is not listed among the provider's advertised APIs on the landing page","No documentation, request schema, or response schema available — docs/pricing/API pages only show 'Connect wallet'","The endpoint path references a hardcoded email ID (38), suggesting it may be a demo or test resource","Actual functionality and returned data are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/38/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/38/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint path (/api/v1/emails/38/attachments) is not listed among the provider's advertised APIs. The purpose and data model are 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'/request':116 '0.02':10,22,59,71,115 '000':65 '20':64 '38':37 '6':69 'Base USDC micropayment' 'accept':43 'access':30 'actual':181 'advertis':76,139 'ai/ml':87 'among':137 'analysi':90 'analyt':86 'api':83,121,140,161 'attach':3,15,33 'base':8,20,56,66 'behind':38 'bodi':152 'broader':73 'call':61 'classif':92 'commit':128 'connect':170 'content':176 'convers':109 'data':85,184 'decim':70 'describ':149 'doc':160 'document':147 'email':2,14,32,35 'email attachment API' 'email-attachments' 'embed':93 'endpoint':26,132,188 'estim':103 'exchang':98 'exist':148 'expect':154 'feed':97 'financ':94 'format':158 'function':182 'gas':102 'gate':82 'generat':110 'geocod':107 'howev':129 'id':36 'infer':88 'infrastructur':105 'json':48 'key':122 'land':143 'limit':125 'list':136 'lowpaymentfee email' 'lowpaymentfee.com':28,74 'maxamountrequir':62 'micropay':6,18 'micropayment' 'network':57 'page':144,165 'paid email access' 'paramet':155 'payment':49 'paywal':41 'per':11,23,60 'platform':75 'point':118 'post':44 'post-json' 'price':96,117,162 'prompt':172 'provid':29 'quot':101 'rate':99,124 'readm':164 'remain':189 'render':167 'request':12,24,45,151 'respons':157 'result':179 'retriev':1,13 'return':47,185 'schema':153 'sentiment':89 'settl':51 'span':84 'specif':34,131 'substant':175 'suit':78 'summar':91 'token':100 'unclear':190 'unit':67 'usdc':53 'usdc-base' 'util':106 'valid':108 'via':4,16 'wallet':171 'web3':95 'x402':5,17,40,81 'x402 email endpoint' 'x402-gated':80 'x402-payment'","prices":[{"id":"cc9f9961-4ff7-45d8-b158-b932fb3ac9ed","listingId":"4789f06a-2ade-4a00-804a-d6e4ffde6412","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/38/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":"2026-04-21T18:32:10.810Z"}],"sources":[{"listingId":"4789f06a-2ade-4a00-804a-d6e4ffde6412","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/38/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.810Z","lastSeenAt":"2026-04-22T04:02:23.417Z"}],"details":{"listingId":"4789f06a-2ade-4a00-804a-d6e4ffde6412","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/38/attachments \\\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 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/38/attachments"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base with the extra name 'USD Coin'","source_url":"https://lowpaymentfee.com/api/v1/emails/38/attachments"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically retrieving email attachments behind a paywall","Agent-driven access to stored email data via micropayment","Automated document retrieval from email archives"],"bestFor":["Agents needing on-demand access to specific email attachments","Workflows requiring pay-per-use document retrieval without API keys","x402-compatible clients on the Base network"],"notFor":["Bulk email processing or mailbox-level access","Users who need detailed API documentation before integrating","Non-crypto payment workflows (no fiat option available)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.781Z"},"updatedAt":"2026-04-22T04:02:23.417Z"}}