# Machine Inbox — Extend Inbox by Seven Days

> Machine Inbox — Extend Inbox by Seven Days is a paid API for AI agents from machineinbox.com, paid per call via x402, $1/call, status unknown (last checked 2026-09-16).

Extends the expiration of an existing Machine Inbox email inbox by seven additional days

## Facts

- Endpoint: POST https://machineinbox.com/api/v1/inboxes/160072df-a508-4355-9b17-c1edfa18bb7d/extend
- Price: $1/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-extend-inbox-by-seven-days-d32739c0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_enQuqVFwVm35knG8KhcvW

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-extend-inbox-by-seven-days-d32739c0 -d '<json body>'
```

Example prompt: My Machine Inbox with ID 160072df-a508-4355-9b17-c1edfa18bb7d is about to expire — can you extend it for another seven days?

## When to prefer this

Use this endpoint when you already have an active Machine Inbox (created via the separate create endpoint) and need to keep it alive beyond its original seven-day window. Prefer this over creating a new inbox when you need to preserve the same email address and any messages already in the inbox. Best used in automated workflows that monitor inbox expiration and trigger renewal before the deadline.

## Known failure modes

- Inbox ID not found or invalid UUID — returns 404
- Inbox already expired and cannot be extended — returns error indicating the inbox must be recreated
- Payment of $1 USDC not completed — returns 402 Payment Required
- Duplicate extension request within very short window may fail if state has not settled

## How this service works

Extend an active inbox by seven days

## Output

Returns confirmation that the inbox has been extended by seven days, typically including the new expiration timestamp and updated inbox status.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "inboxId"
     ],
     "properties": {
      "inboxId": {
       "type": "string",
       "format": "uuid"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/machine-inbox-extend-inbox-by-seven-days-d32739c0/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)