{"id":"c1e1d4b9-ab60-4058-a7e5-ed55757f9350","shortId":"B4MD2d","kind":"mpp","title":"Read a single subdomain inbox message via micropayment — $0.001 USDC per call, no API keys.","tagline":"Read a single subdomain inbox message via micropayment — $0.001 USDC per call, no API keys.","description":"This endpoint reads a single message from a subdomain inbox on StableEmail. It is part of the StableEmail platform, which provides pay-per-use email delivery, forwarding inboxes, and custom subdomains — all authenticated via x402/MPP micropayments rather than traditional API keys or accounts.\n\nPOST a JSON body with a `messageId` and pay $0.001 USDC (on Base, Solana, or Tempo) per call. The response includes the full message: sender, recipients, subject, date, plain text body, HTML body, attachment metadata with 1-hour download URLs, and a received timestamp. Reading a message also marks it as read. Message content is retained for 90 days from receipt. The payer wallet must be the subdomain owner.\n\nThis endpoint is one piece of a broader subdomain inbox system. Subdomain owners first purchase a subdomain ($5), create per-address inboxes ($0.25 each, up to 100 per subdomain, 500 messages each), then list and read messages programmatically. Free SIWX-authenticated endpoints handle inbox management (create, update, delete, list). Payment is handled via the x402/MPP protocol: send the request, receive a 402 challenge, sign the USDC payment, and resend. Compatible clients like agentcash handle this flow automatically.","tags":["email","send","inbox","forwarding","subdomain"],"capabilities":["email-read","subdomain-inbox","micropayment-auth","x402-protocol","mpp-protocol","usdc-payment","message-retrieval","attachment-download-urls","mark-as-read"],"categories":["email","messaging"],"synonyms":["read email message","fetch inbox message","subdomain mailbox read","programmatic email access","email API read","inbox message retrieval","stableemail subdomain inbox"],"warnings":["Probe returned 405 because HEAD/GET were tried on a POST-only endpoint; the endpoint is expected to be live when called with POST and a valid payment.","No formal OpenAPI response schema defined — response structure is documented only in the x-guidance text.","Message content is retained for only 90 days from receipt."],"endpointUrl":"https://stableemail.dev/api/subdomain/inbox/messages/read","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stableemail.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.880","qualityRationale":"Full OpenAPI schema with request/response structure documented, clear pricing ($0.001 USDC), comprehensive guidance text, and live origin (root returns 200). The probe shows 405 on HEAD/GET which is expected since this is a POST-only endpoint. Response schema details come from guidance text rather than formal OpenAPI response schemas, slightly reducing the 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'0.25':167 '1':111 '100':171 '402':207 '5':161 '500':174 '90':132 'account':74 'address':165 'agentcash':218 'also':122 'api':14,29,71 'attach':108 'attachment-download-urls' 'authent':64,186 'automat':222 'base':87 'bodi':78,105,107 'broader':151 'call':12,27,92 'challeng':208 'client':216 'compat':215 'content':128 'creat':162,191 'custom':61 'date':102 'day':133 'delet':193 'deliveri':57 'download':113 'email':56 'email API read' 'email-read' 'endpoint':32,145,187 'fetch inbox message' 'first':157 'flow':221 'forward':58 'free':183 'full':97 'handl':188,197,219 'hour':112 'html':106 'inbox':5,20,40,59,153,166,189 'inbox message retrieval' 'includ':95 'json':77 'key':15,30,72 'like':217 'list':178,194 'manag':190 'mark':123 'mark-as-read' 'messag':6,21,36,98,121,127,175,181 'message-retrieval' 'messageid':81 'metadata':109 'micropay':8,23,67 'micropayment-auth' 'mpp-protocol' 'must':139 'one':147 'owner':143,156 'part':45 'pay':53,83 'pay-per-us':52 'payer':137 'payment':195,212 'per':11,26,54,91,164,172 'per-address':163 'piec':148 'plain':103 'platform':49 'post':75 'programmat':182 'programmatic email access' 'protocol':201 'provid':51 'purchas':158 'rather':68 'read':1,16,33,119,126,180 'read email message' 'receipt':135 'receiv':117,205 'recipi':100 'request':204 'resend':214 'respons':94 'retain':130 'send':202 'sender':99 'sign':209 'singl':3,18,35 'siwx':185 'siwx-authent':184 'solana':88 'stableemail':42,48 'stableemail subdomain inbox' 'subdomain':4,19,39,62,142,152,155,160,173 'subdomain mailbox read' 'subdomain-inbox' 'subject':101 'system':154 'tempo':90 'text':104 'timestamp':118 'tradit':70 'updat':192 'url':114 'usdc':10,25,85,211 'usdc-payment' 'use':55 'via':7,22,65,198 'wallet':138 'x402-protocol' 'x402/mpp':66,200","prices":[{"id":"55203f48-b61e-4a01-ad09-2115ebe77181","listingId":"c1e1d4b9-ab60-4058-a7e5-ed55757f9350","amountUsd":"0.001","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"1000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"stableemail.dev","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"1000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Read a subdomain inbox message"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:59:28.221Z"}],"sources":[{"listingId":"c1e1d4b9-ab60-4058-a7e5-ed55757f9350","source":"mpp_dev","sourceId":"stableemail:POST:/api/subdomain/inbox/messages/read","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:28.221Z","lastSeenAt":"2026-04-22T02:45:06.184Z"}],"details":{"listingId":"c1e1d4b9-ab60-4058-a7e5-ed55757f9350","quickStartSnippet":"curl -X POST https://stableemail.dev/api/subdomain/inbox/messages/read \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"messageId\": \"msg-abc123\"}'  \n# Returns 402 → pay $0.001 USDC via x402/MPP → resend with payment header\n# Or use: npx agentcash fetch POST https://stableemail.dev/api/subdomain/inbox/messages/read '{\"messageId\":\"msg-abc123\"}'","exampleRequest":{"messageId":"msg-abc123"},"exampleResponse":{"message":{"id":"msg-abc123","to":["biden@craig.stableemail.dev"],"date":"2025-01-15T10:30:00Z","from":"sender@example.com","html":"<p>Hi, just confirming our meeting tomorrow at 2pm.</p>","text":"Hi, just confirming our meeting tomorrow at 2pm.","subject":"Meeting tomorrow","receivedAt":"2025-01-15T10:30:05Z","attachments":[{"size":45230,"filename":"agenda.pdf","contentType":"application/pdf"}]},"success":true},"schema":{"path":"/api/subdomain/inbox/messages/read","method":"POST","payment":{"amount":"1000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Read a subdomain inbox message"},"description":"Read a subdomain inbox message"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Read a single subdomain inbox message costs $0.001 USDC","source_url":"https://stableemail.dev/.well-known/x402"},{"claim":"Returns message with id, from, to, subject, date, text, html, attachments, receivedAt and marks as read","source_url":"https://stableemail.dev"},{"claim":"Payment accepted on Base (eip155:8453), Solana, or Tempo via x402/MPP protocol","source_url":"https://stableemail.dev"},{"claim":"Payer wallet must be the subdomain owner","source_url":"https://stableemail.dev"},{"claim":"Message content and attachments retained for 90 days from receipt","source_url":"https://stableemail.dev"},{"claim":"Attachment download URLs expire after 1 hour","source_url":"https://stableemail.dev"},{"claim":"Max 100 inboxes per subdomain, 500 messages per inbox","source_url":"https://stableemail.dev"}],"useCases":["AI agents reading inbound emails on a custom subdomain inbox programmatically","Automated workflows that process incoming messages (e.g., parsing order confirmations, support tickets)","Building a custom email client on top of subdomain inboxes without traditional email provider accounts","Monitoring a dedicated inbox address for specific incoming communications"],"bestFor":["Agents and bots that need programmatic read access to a dedicated email inbox","Developers who want email receiving without managing IMAP/POP3 infrastructure","Pay-per-use email reading with no subscription or API key setup"],"notFor":["High-volume email reading where per-message costs add up (thousands of reads per day)","Reading emails from external mailboxes (Gmail, Outlook) — only works with StableEmail subdomain inboxes","Users who need messages retained longer than 90 days"],"kindDetails":{"docs":{"llmsTxt":"https://stableemail.dev/llms.txt","homepage":"https://stableemail.dev"},"tags":["email","send","inbox","forwarding","subdomain"],"realm":"stableemail.dev","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://stableemail.dev","name":"Merit Systems"},"categories":["social"],"service_id":"stableemail","integration":"first-party","service_name":"StableEmail","service_description":"Pay-per-send email delivery, forwarding inboxes, and custom subdomains — no API keys or accounts."},"updatedAt":"2026-04-22T02:45:06.184Z"}}