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AgentMail Send Email via x402
x402
AgentMail Send Email via x402 is a paid API for AI agents from x402.orth.sh, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Sends an email message from a specified AgentMail inbox, returning the message ID and thread ID
Price / call$0.01
Success—
StatusUnknown
How this service works
Send an email message from an inbox. At least one recipient (to, cc, or bcc) is required. Returns the message_id and thread_id. Replace {inbox_id} directly in the path with the full inbox email (e.g., /v0/inboxes/myagent@agentmail.to/messages/send).
Output
Returns a JSON object containing message_id (unique identifier for the sent message) and thread_id (identifier for the email thread the message belongs to), confirming successful delivery from the inbox.
Example use cases
Agent sends onboarding email to new user
“Send a welcome email from onboarding@agentmail.to to newuser@example.com with subject 'Welcome aboard!' and an HTML body that says '<h1>Welcome!</h1><p>We're thrilled to have you. Here's how to get started.</p>'”
Automated notification with CC to team
“Send an email from alerts@agentmail.to to the client at client@corp.com, CC our manager at boss@mycompany.com, with subject 'Your report is ready' and body 'Hi, your weekly analytics report has been generated and is attached.' and attach the PDF file report.pdf in base64.”
Reply-to-different-address follow-up
“Email john.doe@example.com from support@agentmail.to with subject 'Your support ticket #4821' and plain text body 'We've resolved your issue — please let us know if you need anything else.' Set the reply-to address to helpdesk@mycompany.com so replies go there instead.”
Technical details
Endpoint
POSThttps://x402.orth.sh/agentmail/v0/inboxes/:inbox_id/messages/sendWhen to prefer
Choose this endpoint when your AI agent needs to programmatically send outbound email from an AgentMail-managed inbox and you want to pay per-send via x402 micropayments (USDC) without managing SMTP infrastructure. It is ideal for agentic automation workflows where the sending identity is an agent-owned inbox (e.g., myagent@agentmail.to). Prefer this over general SMTP APIs when you need thread tracking (thread_id returned) and per-message cost accountability at $0.01 USDC.
Side effects
- Missing recipient — if none of to, cc, or bcc are provided, the request fails with a validation error
- Invalid inbox_id — if the inbox email does not exist or is not accessible, returns a 404 or authorization error
- Malformed email addresses — invalid email format in recipient fields causes rejection
- Payment failure — x402 micropayment of $0.01 USDC not satisfied results in 402 Payment Required
- Missing body — if neither text nor html body is provided, the message may be rejected
- Invalid attachment format — attachments must include filename, content_type, and either base64 content or a URL; missing fields cause errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cc | array | CC recipient email address(es). String or array of strings. |
| to | array | Recipient email address(es). At least one of to, cc, or bcc is required. Can be a string or array of strings. |
| bcc | array | BCC recipient email address(es). String or array of strings. |
| html | string | HTML body. Provide text, html, or both. |
| text | string | Plain text body. Provide text, html, or both. |
| labels | array | Array of label strings to tag the sent message. |
| headers | object | Custom email headers as key-value pairs (e.g., {"X-Custom": "value"}). |
| subject | string | Email subject line. |
| reply_to | array | Reply-to address(es) if different from the inbox address. |
| attachments | array | Array of attachment objects: {filename: string, content_type: string, content: string (base64)} or {filename: string, content_type: string, url: string}. |
Tags
x402
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