# StableEmail Cancel Inbox

> StableEmail Cancel Inbox is a free API for AI agents from StableEmail at stableemail.dev, callable via MPP, Free, status unknown (last checked 2026-10-12).

Cancels an active StableEmail inbox and issues a pro-rata refund to the specified address

## Facts

- Endpoint: POST https://stableemail.dev/api/inbox/cancel?utm_source=zero.xyz
- Price: Free
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Provider: StableEmail
- Docs: https://stableemail.dev
- Website: https://stableemail.dev
- Tags: email, send, inbox, forwarding, subdomain, social
- Canonical page: https://www.zero.xyz/c/stableemail-cancel-ee37d699
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QWTOxU6aihM29mrLFSeuF

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 stableemail-cancel-ee37d699 -d '<json body>'
```

Example prompt: Cancel my StableEmail inbox with username 'myapp-relay' and send the pro-rata refund to my wallet at 0xAbC1234567890abcdef1234567890abcdef123456.

## When to prefer this

Use this endpoint when you want to permanently close a StableEmail inbox before its 30-day period expires and recover unused value. It is the correct endpoint for deactivating inboxes rather than just updating settings or deleting individual messages.

## Known failure modes

- Username not found — inbox does not exist
- Invalid username format — must match pattern ^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$ with no consecutive hyphens
- Invalid refundAddress — must be a valid 0x-prefixed 40-character hex Ethereum address
- Inbox already expired or previously cancelled — no refund available
- Network or payment settlement failure during refund processing

## How this service works

Cancel inbox and get pro-rata refund (free)

## Output

Confirmation that the inbox has been cancelled and a pro-rata refund has been initiated, along with details about the refund amount or transaction to the provided Ethereum wallet address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "username"
 ],
 "properties": {
  "username": {
   "type": "string",
   "allOf": [
    {
     "pattern": "^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$"
    },
    {
     "pattern": "^(?!.*--)"
    }
   ]
  },
  "refundAddress": {
   "type": "string",
   "pattern": "^0x[a-fA-F0-9]{40}$"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stableemail-cancel-ee37d699/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stableemail.dev](https://www.zero.xyz/host/stableemail.dev/llms.txt)