# Machine Inbox Verification Inbox

> Machine Inbox Verification Inbox is a paid API for AI agents from machineinbox.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11).

Creates a disposable one-hour email inbox for receiving a single signup verification code (up to 10 messages, no reply capability)

## Facts

- Endpoint: POST https://machineinbox.com/api/v1/inboxes/verification?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/machine-inbox-verification-inbox-6500af72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fhcdHvNYssfLU21dl-FME

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-verification-inbox-6500af72 -d '<json body>'
```

Example prompt: I need a one-hour throwaway email inbox to catch a signup verification code — can you spin one up via Machine Inbox so my agent can receive that email and extract the code?

## When to prefer this

Choose this endpoint when an AI agent needs a machine-readable, pay-per-use disposable email address specifically for receiving a single verification code during an automated signup or registration flow, and when a one-hour lifetime is sufficient. It is purpose-built for agents (x402 micropayment native, structured JSON response) and is preferable to general-purpose temporary email services when you need programmatic inbox creation with access tokens and predictable expiry.

## Known failure modes

- Payment failure (insufficient USDC balance or x402 payment rejected) — inbox not created
- Malformed request body — 400 error if required fields missing
- Rate limiting or quota exceeded — service may reject rapid successive calls
- Inbox creation service unavailable — transient 5xx error
- Token returned but inbox address undeliverable — messages may not arrive if DNS/MX propagation delayed

## 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 inbox UUID, the assigned email address (e.g. m_example@in.machineinbox.com), the expiry timestamp (one hour from creation), and a bearer-style access token (mi_live_...) used to poll or read incoming messages.

## 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": "2026-08-18T13:00:00.000Z"
  },
  "token": "mi_live_..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machine-inbox-verification-inbox-6500af72/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)