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Mermail Agent Email Reply
x402
Mermail Agent Email Reply is a paid API for AI agents from console.mermail.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Send a reply to a specific email in an AI agent's mailbox, queuing the outbound message with optional CC/BCC, HTML body, and attachments
Price / call$0.01
Success—
StatusUnknown
How this service works
An inbox and wallet for your AI agent. Find and nurture sales leads, resolve customer support, and handle online purchases with controlled payments.
Output
Returns a JSON object with a 'status' field set to 'queued', confirming the reply has been accepted and scheduled for delivery from the agent's mailbox.
Example use cases
Automated customer support reply
“Someone emailed my agent's Mermail inbox asking about their order status — reply to that email with 'Your order #4821 is on its way and should arrive by Friday' and keep it in the same thread.”
Sales lead follow-up
“A prospect just emailed us through my agent's Mermail mailbox expressing interest in our pricing — have the agent reply with our standard intro pitch and CC my sales manager at jane@mycompany.com.”
Notify sender with HTML-formatted reply
“Reply to the email I got in my Mermail agent mailbox from the enterprise client — use a nicely formatted HTML response with a greeting, our updated SLA terms in bullet points, and BCC legal@mycompany.com.”
Technical details
Endpoint
POSThttps://console.mermail.app/api/agent/v1/mailboxes/%7BmailboxId%7D/emails/%7BemailId%7D/reply?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to send an outbound reply to a specific email it has already received in its Mermail managed mailbox — particularly for agentic workflows around customer support, sales lead nurturing, or any scenario where the agent must continue an existing email thread rather than initiate a new one.
Side effects
- Invalid mailboxId or emailId returns 404 not found
- Malformed email addresses in to/cc/bcc fields cause validation errors
- Missing required authentication or insufficient payment (x402) causes 402 Payment Required
- Empty message body (both text and html absent) may be rejected
- Invalid UUID for client_send_id returns 400 bad request
- Network timeout without confirmation of queueing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cc | — | |
| to | — | |
| bcc | — | |
| from | — | |
| html | string | |
| text | string | |
| subject | string | |
| thread_id | string | |
| references | array | |
| attachments | array | |
| in_reply_to | string | |
| client_send_id | string | |
| source_draft_id | string |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "queued"
}
}Tags
x402
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