# Machine Inbox — Create 7-Day Private Email Inbox

> Machine Inbox — Create 7-Day Private Email Inbox is a paid API for AI agents from machineinbox.com, paid per call via x402, $2/call, status unknown (last checked 2026-09-16).

Creates a private, temporary email inbox that expires after seven days, returning a unique email address and access token for agent use

## Facts

- Endpoint: POST https://machineinbox.com/api/v1/inboxes
- Price: $2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/machine-inbox-create-7-day-private-email-inbox-835a2e30
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__Ap60vOC8hAv9zlpjmLgb

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability machine-inbox-create-7-day-private-email-inbox-835a2e30 -d '<json body>'
```

Example prompt: Spin up a fresh private Machine Inbox email address for me — I need it to last seven days so my agent can receive messages during the workflow.

## When to prefer this

Choose this endpoint when an AI agent needs a real, persistent email address that can receive multiple messages over an extended period (up to 7 days) rather than a one-time verification code. Prefer this over the 1-hour verification inbox when your workflow spans more than an hour or requires ongoing email communication. Ideal for agents managing multi-day workflows, onboarding sequences, or any automated process where a stable inbox identity is needed for a week.

## Known failure modes

- Payment failure — insufficient USDC balance or x402 payment not accepted, resulting in 402 Payment Required
- Invalid request body — missing required fields returns 400 Bad Request
- Service unavailability — upstream email infrastructure down, returns 503
- Rate limiting — too many inbox creation requests in a short window, returns 429
- Authentication failure — invalid or missing payment credentials

## 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), the ISO 8601 expiration timestamp (7 days from creation), and a bearer token (mi_live_...) for authenticating subsequent requests to read or manage the inbox.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "inbox": {
   "id": "uuid",
   "address": "m_example@in.machineinbox.com",
   "expiresAt": "2026-08-25T12:00:00.000Z"
  },
  "token": "mi_live_..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machine-inbox-create-7-day-private-email-inbox-835a2e30/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from machineinbox.com](https://www.zero.xyz/host/machineinbox.com/llms.txt)