{"id":"c533447d-b153-4ed0-9052-c3322f3b1b56","shortId":"qxTCaD","kind":"mpp","title":"Send an email from an AI agent's inbox via the AgentMail API, paid per-call over MPP.","tagline":"Send an email from an AI agent's inbox via the AgentMail API, paid per-call over MPP.","description":"This endpoint sends an email message from a specific AgentMail inbox. It is part of the AgentMail MPP gateway — a full email infrastructure API designed for AI agents. You POST a JSON body containing recipients (to, cc, bcc), subject, text/html body, optional attachments, headers, and reply-to addresses. On success it returns the new message_id and thread_id.\n\nThe endpoint lives at `POST /v0/inboxes/{inbox_id}/messages/send` and requires Bearer authentication. According to the OpenAPI spec's `x-payment-info`, the fixed price per call is 0.01 (the currency/unit is not explicitly stated in the spec but the broader AgentMail MPP gateway uses dollar-denominated pricing for other operations like $2.00 to create an inbox and $10.00 to create a domain). The endpoint supports to/cc/bcc as either a single string or an array of strings, HTML and plain-text bodies, custom headers, and file attachments (base64-encoded or by URL).\n\nAgentMail is a YC-backed company that raised $6M in seed funding. The broader API also exposes inbox management, threads, drafts, webhooks, custom domains, allow/block lists, and metrics — all accessible through the same MPP gateway at mpp.api.agentmail.to.","tags":["email","inboxes","domains","drafts","threads","webhooks","messaging"],"capabilities":["send-email","email-attachments","html-email","plain-text-email","custom-headers","cc-bcc","reply-to","bearer-auth","mpp-payment","per-call-pricing"],"categories":["email","communication"],"synonyms":["agent email send","programmatic email","email API","send mail API","AI agent email","agentmail send message","outbound email API","transactional email"],"warnings":["Probe did not capture a 402 MPP challenge on this POST-only endpoint (HEAD returned 404, GET returned 403); the endpoint is likely live but liveness is not fully confirmed.","Price is listed as 0.01 in x-payment-info but the currency/token and decimals are not explicitly specified in the OpenAPI spec; inferred as ~$0.01 USD based on sibling endpoint pricing patterns."],"endpointUrl":"https://mpp.api.agentmail.to/v0/inboxes/:inbox_id/messages/send","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"mpp.api.agentmail.to","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.720","qualityRationale":"Full OpenAPI 3.1 schema is available with detailed request/response types and x-payment-info pricing. However, the probe did not capture a live 402 MPP challenge on this specific endpoint (returned 404 on HEAD, 403 on GET — expected since it's a POST-only route). The price unit/currency is not explicitly labeled in the spec, requiring inference from 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'/v0/inboxes':104 '0.01':128 '10.00':159 '2.00':153 '6m':204 'AI agent email' 'access':225 'accord':112 'address':87 'agent':7,26,66 'agent email send' 'agentmail':12,31,48,55,141,195 'agentmail send message' 'ai':6,25,65 'allow/block':220 'also':211 'api':13,32,62,210 'array':175 'attach':81,188 'authent':111 'back':200 'base64':190 'base64-encoded':189 'bcc':76 'bearer':110 'bearer-auth' 'bodi':71,79,183 'broader':140,209 'call':17,36,126 'cc':75 'cc-bcc' 'compani':201 'contain':72 'creat':155,161 'currency/unit':130 'custom':184,218 'custom-headers' 'denomin':147 'design':63 'dollar':146 'dollar-denomin':145 'domain':163,219 'draft':216 'either':169 'email':3,22,43,60 'email API' 'email-attachments' 'encod':191 'endpoint':40,100,165 'explicit':133 'expos':212 'file':187 'fix':123 'full':59 'fund':207 'gateway':57,143,230 'header':82,185 'html':178 'html-email' 'id':95,98,106 'inbox':9,28,49,105,157,213 'info':121 'infrastructur':61 'json':70 'like':152 'list':221 'live':101 'manag':214 'messag':44,94 'metric':223 'mpp':19,38,56,142,229 'mpp-payment' 'mpp.api.agentmail.to':232 'new':93 'openapi':115 'oper':151 'option':80 'outbound email API' 'paid':14,33 'part':52 'payment':120 'per':16,35,125 'per-cal':15,34 'per-call-pricing' 'plain':181 'plain-text':180 'plain-text-email' 'post':68,103 'price':124,148 'programmatic email' 'rais':203 'recipi':73 'repli':85 'reply-to':84 'requir':109 'return':91 'seed':206 'send':1,20,41 'send mail API' 'send-email' 'singl':171 'spec':116,137 'specif':47 'state':134 'string':172,177 'subject':77 'success':89 'support':166 'text':182 'text/html':78 'thread':97,215 'to/cc/bcc':167 'transactional email' 'url':194 'use':144 'via':10,29 'webhook':217 'x':119 'x-payment-info':118 'yc':199 'yc-back':198","prices":[{"id":"4d5c1564-3e05-4426-9ec1-af94425b5695","listingId":"c533447d-b153-4ed0-9052-c3322f3b1b56","amountUsd":"0.01","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"10000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"mpp.api.agentmail.to","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"10000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Send message"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:47:31.393Z"}],"sources":[{"listingId":"c533447d-b153-4ed0-9052-c3322f3b1b56","source":"mpp_dev","sourceId":"agentmail:POST:/v0/inboxes/:inbox_id/messages/send","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:47:31.393Z","lastSeenAt":"2026-04-22T04:15:05.838Z"}],"details":{"listingId":"c533447d-b153-4ed0-9052-c3322f3b1b56","quickStartSnippet":"curl -X POST 'https://mpp.api.agentmail.to/v0/inboxes/{inbox_id}/messages/send' \\\n  -H 'Authorization: Bearer <TOKEN>' \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n    \"to\": \"recipient@example.com\",\n    \"subject\": \"Hello from my agent\",\n    \"text\": \"This email was sent by an AI agent.\"\n  }'","exampleRequest":{"cc":["bob@example.com"],"to":["alice@example.com"],"html":"<h1>Report</h1><p>Here is your weekly summary.</p>","text":"Report\nHere is your weekly summary.","subject":"Weekly Report","attachments":[{"content":"<base64-encoded-content>","filename":"report.pdf","content_type":"application/pdf","content_disposition":"attachment"}]},"exampleResponse":{"thread_id":"thr_xyz789","message_id":"msg_abc123"},"schema":{"path":"/v0/inboxes/:inbox_id/messages/send","method":"POST","payment":{"amount":"10000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Send message"},"description":"Send message"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The send message endpoint is POST /v0/inboxes/{inbox_id}/messages/send with fixed price 0.01 per call","source_url":"https://mpp.api.agentmail.to"},{"claim":"Request body accepts to, cc, bcc, html, text, subject, headers, reply_to, and attachments fields per the SendMessageRequest schema","source_url":"https://mpp.api.agentmail.to"},{"claim":"Response returns message_id and thread_id per the SendMessageResponse schema","source_url":"https://mpp.api.agentmail.to"},{"claim":"Creating an inbox costs 2.000000 and creating a domain costs 10.000000 in the same pricing system","source_url":"https://mpp.api.agentmail.to"},{"claim":"AgentMail raised $6M in seed funding and is YC-backed","source_url":"https://mpp.api.agentmail.to"}],"useCases":["AI agent sends outbound emails on behalf of a user or organization","Automated customer support agent replies to inbound emails","Workflow automation that composes and sends email notifications","Agent-to-agent communication via dedicated email inboxes","Sending transactional emails with attachments from an AI pipeline"],"bestFor":["AI agents that need their own email addresses and outbound sending","Developers building agent workflows that include email communication","Pay-per-call email sending without monthly subscriptions"],"notFor":["Bulk marketing email campaigns (no mention of bulk-send support)","Reading or receiving email (use the messages/list or webhooks endpoints instead)","Human-facing email clients or webmail UIs"],"kindDetails":{"docs":{"homepage":"https://docs.agentmail.to"},"tags":["email","inboxes","domains","drafts","threads","webhooks","messaging"],"realm":"mpp.api.agentmail.to","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://agentmail.to","name":"AgentMail"},"categories":["ai","social"],"service_id":"agentmail","integration":"first-party","service_name":"AgentMail","service_description":"Email inboxes for AI agents."},"updatedAt":"2026-04-22T04:15:05.838Z"}}