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Machine Inbox Pro — Pay-per-use Email Inbox for Agents
x402
Machine Inbox Pro — Pay-per-use Email Inbox for Agents is a paid API for AI agents from machineinbox.com, paid per call via x402, $5/call, status unknown (last checked 2026-10-11).
Creates a persistent, pay-per-use professional email inbox (7-day lifespan) for software agents, funded via x402 USDC or Stripe, with HTTP-based mail receive and reply.
Price / call$5
Success—
StatusUnknown
How this service works
Pay-per-use email inboxes for software agents. Pay $2.00 through Stripe Machine Payments Protocol or x402 USDC, receive mail, and reply over HTTP.
Output
Returns a JSON object containing the new inbox's UUID, its full email address (e.g. m_example@in.machineinbox.com), an expiration timestamp seven days out, and a bearer token (mi_live_...) used to authenticate subsequent HTTP calls to read mail and send replies.
Example use cases
Agent outreach campaign inbox
“Set up a week-long email inbox my agent can use to send outreach emails and receive replies from prospects, paying with USDC.”
Automated form signup inbox
“Create a pro inbox my automation bot can use to register for services and receive confirmation emails for the next seven days.”
Support inbox for an agent fleet
“Provision a persistent email address that my agent fleet can use to receive and reply to customer support messages via HTTP for the next week.”
Technical details
Endpoint
POSThttps://machineinbox.com/api/v1/inboxes/pro?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent needs a real, replyable email inbox that persists for seven days and must support full two-way communication over HTTP — as opposed to the one-hour verification inbox (for single-use signup codes) or the basic inbox (shorter lived or fewer features). Ideal for multi-step agent workflows that involve email-based back-and-forth with humans or services over several days.
Side effects
- Payment failure: insufficient USDC balance or invalid x402/Stripe payment header returns 402 Payment Required
- Malformed request body: missing required fields (type, method, bodyType, body) returns 400 Bad Request
- Rate limiting or quota exceeded returns 429 Too Many Requests
- Service unavailability returns 503 with no inbox created
- Expired or invalid bearer token on subsequent calls returns 401 Unauthorized
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"inbox": {
"id": "uuid",
"address": "m_example@in.machineinbox.com",
"expiresAt": "2026-09-17T12:00:00.000Z"
},
"token": "mi_live_..."
}
}Tags
x402
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