{"id":"d442f821-d9d9-4848-99d6-ae8f64532e21","shortId":"YrCzHU","kind":"mpp","title":"List inbox messages programmatically via MPP micropayment ($0.001 USDC per call).","tagline":"List inbox messages programmatically via MPP micropayment ($0.001 USDC per call).","description":"This endpoint lists messages in a StableEmail forwarding inbox (username@stableemail.dev). 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 with no API keys or accounts required.\n\nPOST /api/inbox/messages accepts a JSON body with a required `username` field (the inbox name), plus optional `cursor` (for pagination) and `limit` (1–100, default 20). The endpoint costs $0.001 USDC per call, settled on Base (eip155:8453), Solana, or Tempo via the MPP protocol. The payer wallet must be the inbox owner. The response returns a paginated list of message summaries including id, sender email, subject, received date, and read status, along with a `nextCursor` for fetching subsequent pages.\n\nTo use this endpoint, the inbox must have `retainMessages` enabled (set via POST /api/inbox/update). Message content and attachments are retained for 90 days. The inbox itself is purchased for $1/30 days via POST /api/inbox/buy. Individual messages can then be read in full via POST /api/inbox/messages/read ($0.001) or deleted via POST /api/inbox/messages/delete (free, SIWX auth). The recommended agent integration path is via the agentcash-skills MCP server (`npx -y agentcash@latest`), which handles payment negotiation automatically.","tags":["email","send","inbox","forwarding","subdomain"],"capabilities":["email-inbox-list","paginated-messages","mpp-payment","x402-payment","siwx-auth","forwarding-inbox","programmatic-mailbox","usdc-micropayment"],"categories":["email","communication"],"synonyms":["list inbox emails","fetch mailbox messages","email inbox API","read inbox","paginated email list","forwarding inbox messages","StableEmail messages","micropayment email"],"warnings":["Probe returned 405 because it tried HEAD/GET on a POST-only endpoint; the endpoint is expected to be live when called with POST and proper MPP payment.","No formal OpenAPI response schema defined — response structure is inferred from x-guidance documentation only.","The /docs page returns 404; all documentation comes from the OpenAPI x-guidance field and the landing page."],"endpointUrl":"https://stableemail.dev/api/inbox/messages","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stableemail.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.820","qualityRationale":"Full OpenAPI 3.1 schema with detailed request/response documentation from x-guidance. The endpoint is a POST (probe tried HEAD/GET and got 405, which is expected). Pricing is clearly documented at $0.001 USDC. Response schema is described in guidance text but not formally in OpenAPI responses 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'/api/inbox/messages':66 '/api/inbox/messages/delete':194 '/api/inbox/messages/read':188 '/api/inbox/update':157 '0.001':8,19,93,189 '1':86 '1/30':173 '100':87 '20':89 '8453':101 '90':165 'StableEmail messages' 'accept':67 'account':63 'agent':200 'agentcash':207,213 'agentcash-skil':206 'along':136 'api':60 'attach':161 'auth':197 'authent':54 'automat':219 'base':99 'bodi':70 'call':11,22,96 'content':159 'cost':92 'cursor':81 'custom':51 'date':132 'day':166,174 'default':88 'delet':191 'deliveri':47 'eip155':100 'email':46,129 'email inbox API' 'email-inbox-list' 'enabl':153 'endpoint':24,91,147 'fetch':141 'fetch mailbox messages' 'field':75 'forward':30,48 'forwarding inbox messages' 'forwarding-inbox' 'free':195 'full':185 'handl':216 'id':127 'inbox':2,13,31,49,77,115,149,168 'includ':126 'individu':178 'integr':201 'json':69 'key':61 'latest':214 'limit':85 'list':1,12,25,122 'list inbox emails' 'mcp':209 'messag':3,14,26,124,158,179 'micropay':7,18,57 'micropayment email' 'mpp':6,17,107 'mpp-payment' 'must':112,150 'name':78 'negoti':218 'nextcursor':139 'npx':211 'option':80 'owner':116 'page':143 'pagin':83,121 'paginated email list' 'paginated-messages' 'part':35 'path':202 'pay':43 'pay-per-us':42 'payer':110 'payment':217 'per':10,21,44,95 'platform':39 'plus':79 'post':65,156,176,187,193 'programmat':4,15 'programmatic-mailbox' 'protocol':108 'provid':41 'purchas':171 'read':134,183 'read inbox' 'receiv':131 'recommend':199 'requir':64,73 'respons':118 'retain':163 'retainmessag':152 'return':119 'sender':128 'server':210 'set':154 'settl':97 'siwx':196 'siwx-auth' 'skill':208 'solana':102 'stableemail':29,38 'status':135 'subdomain':52 'subject':130 'subsequ':142 'summari':125 'tempo':104 'usdc':9,20,94 'usdc-micropayment' 'use':45,145 'usernam':74 'username@stableemail.dev':32 'via':5,16,55,105,155,175,186,192,204 'wallet':111 'x402-payment' 'x402/mpp':56 'y':212","prices":[{"id":"eff63fa7-258a-4274-b923-285d2c39ee7b","listingId":"d442f821-d9d9-4848-99d6-ae8f64532e21","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":"List messages in inbox"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:59:29.446Z"}],"sources":[{"listingId":"d442f821-d9d9-4848-99d6-ae8f64532e21","source":"mpp_dev","sourceId":"stableemail:POST:/api/inbox/messages","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:29.446Z","lastSeenAt":"2026-04-22T02:45:06.271Z"}],"details":{"listingId":"d442f821-d9d9-4848-99d6-ae8f64532e21","quickStartSnippet":"# List messages in your StableEmail inbox\n# First request returns 402; pay via MPP/x402, then resend with payment header\ncurl -X POST https://stableemail.dev/api/inbox/messages \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"username\": \"alice\", \"limit\": 20}'","exampleRequest":{"limit":20,"cursor":null,"username":"alice"},"exampleResponse":{"success":true,"messages":[{"id":"msg_abc123","read":false,"subject":"Meeting tomorrow","fromEmail":"bob@example.com","receivedAt":"2025-01-15T10:30:00Z"},{"id":"msg_def456","read":true,"subject":"Your verification code","fromEmail":"noreply@service.com","receivedAt":"2025-01-15T09:15:00Z"}],"nextCursor":"msg_def456"},"schema":{"path":"/api/inbox/messages","method":"POST","payment":{"amount":"1000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"List messages in inbox"},"description":"List messages in inbox"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"POST /api/inbox/messages costs $0.001 USDC per call","source_url":"https://stableemail.dev"},{"claim":"Accepts username, cursor, and limit parameters; returns paginated message list with id, fromEmail, subject, receivedAt, read fields","source_url":"https://stableemail.dev/.well-known/x402"},{"claim":"Payment accepted on Base, Solana, or Tempo via x402/MPP protocol","source_url":"https://stableemail.dev"},{"claim":"Payer wallet must be the inbox owner","source_url":"https://stableemail.dev"},{"claim":"Requires retainMessages enabled on the inbox; message content retained for 90 days","source_url":"https://stableemail.dev"},{"claim":"Recommended agent integration via agentcash-skills MCP server","source_url":"https://stableemail.dev"}],"useCases":["AI agent checking a disposable inbox for verification codes or replies","Programmatically polling a forwarding inbox for new inbound emails","Building an email monitoring workflow that lists and triages messages","Automated customer support reading inbound messages from a shared inbox"],"bestFor":["AI agents needing programmatic email inbox access without API keys","Developers wanting pay-per-use email reading with no account setup","Workflows that need to poll a forwarding inbox for new messages"],"notFor":["High-volume email retrieval requiring IMAP/POP3 protocols","Users who need free email inbox access without micropayments","Reading emails from external mailboxes (Gmail, Outlook, etc.)"],"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":"2026-04-22T02:45:06.271Z"}}