{"id":"6cb0c2f5-0685-44fa-8b7c-bf7b468584bd","shortId":"FBuwyb","kind":"x402","title":"Pay-per-request email attachment retrieval via x402 on Base (USDC).","tagline":"Pay-per-request email attachment retrieval via x402 on Base (USDC).","description":"This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 23) via an x402 payment-gated POST request. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The cost per request is $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. Payment is settled on-chain via USDC on Base.\n\nHowever, the specific endpoint being listed (`/api/v1/emails/23/attachments`) is not documented on the provider's landing page, which lists only analytics, AI, finance, and utility endpoints. There is no schema, example request/response, or documentation available for this particular email-attachments endpoint. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. As a result, the actual behavior, required input fields, and response format of this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","pay-per-request","no-api-key"],"categories":["storage","email"],"synonyms":["email attachment API","paid email access","x402 email endpoint","USDC email API","Base network API","pay-per-call email"],"warnings":["This specific endpoint (/api/v1/emails/23/attachments) is not listed among the provider's documented APIs on the landing page.","No request body schema or response schema is available — input requirements and output format are unknown.","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no useful content.","The endpoint references a hardcoded email ID (23); it is unclear whether other email IDs are accessible or what the broader email API surface looks like."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/23/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/23/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but this specific email-attachments endpoint is not listed on the provider's landing page, has no documentation, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub 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'0.02':69,111 '000':71 '20':70 '23':37 '6':77 'Base network API' 'USDC email API' 'access':30 'actual':197 'addit':191 'ai':154 'ai/ml':101 'analyt':100,153 'api':97,116,177 'attach':6,18,33,173 'avail':167 'base':11,23,62,72,133 'behavior':198 'broader':85 'call':96 'chain':129 'challeng':55 'commit':123 'connect':186 'content':192 'cost':65 'data':99,104 'decim':78 'doc':176 'document':143,166 'email':5,17,32,35,172 'email attachment API' 'email-attach':171 'email-attachments' 'endpoint':26,47,80,137,158,174,207 'exampl':163 'field':201 'financ':155 'finance/web3':103 'format':204 'gate':43 'howev':134 'id':36 'infer':102 'infrastructur':106 'input':200 'key':117 'land':148 'limit':120 'list':139,151 'live':49 'lowpaymentfee.com':28,87 'network':63 'no-api-key' 'offer':89 'on-chain':127 'page':149,181 'paid email access' 'part':82 'particular':170 'pay':2,14,94 'pay-per-cal':93 'pay-per-call email' 'pay-per-request':1,13 'payment':42,57,124 'payment-g':41 'per':3,15,66,95,112 'platform':86 'post':44 'price':109,178 'prompt':188 'provid':29,146 'rate':119 'readm':180 'render':183 'request':4,16,45,67,113 'request/response':164 'requir':56,199 'respons':203 'result':195 'retriev':7,19 'return':51 'schema':162 'settl':126 'span':98 'specif':34,136 'standard':53 'unit':73 'unknown':209 'usdc':12,24,59,75,131 'usdc-base' 'util':107,157 'varieti':91 'via':8,20,38,130 'wallet':187 'x402':9,21,40,54 'x402 email endpoint' 'x402-payment'","prices":[{"id":"322dabe2-0ecd-49de-ba69-80d942b3db12","listingId":"6cb0c2f5-0685-44fa-8b7c-bf7b468584bd","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/23/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":"2026-04-21T18:32:10.779Z"}],"sources":[{"listingId":"6cb0c2f5-0685-44fa-8b7c-bf7b468584bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/23/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.779Z","lastSeenAt":"2026-04-22T04:02:23.388Z"}],"details":{"listingId":"6cb0c2f5-0685-44fa-8b7c-bf7b468584bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/23/attachments \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/emails/23/attachments"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/23/attachments"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email attachments programmatically with per-request payment","Agent-driven access to stored email data without pre-registration","Automated workflows that need to fetch specific email attachments on demand"],"bestFor":["Agents needing one-off email attachment retrieval without API key setup","Workflows requiring on-chain payment settlement for data access","Developers testing x402 payment flows on Base"],"notFor":["Bulk email processing or high-volume attachment downloads (no documented batch support)","Users who need detailed API documentation or response schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.766Z"},"updatedAt":"2026-04-22T04:02:23.388Z"}}