# StableEmail Subdomain Signers Manager

> StableEmail Subdomain Signers Manager is a free API for AI agents from StableEmail at stableemail.dev, callable via MPP, Free, status unknown (last checked 2026-10-09).

Add or remove authorized wallet addresses as signers for a StableEmail custom subdomain

## Facts

- Endpoint: POST https://stableemail.dev/api/subdomain/signers?utm_source=zero.xyz
- Price: Free
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-09
- 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-signers-2022181d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qqZ-zjcka_LfxUNN3hwEo

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-signers-2022181d -d '<json body>'
```

Example prompt: Add wallet address 0xAbCd1234...5678 as an authorized signer for my StableEmail subdomain 'mycompany' so they can send emails from it.

## When to prefer this

Use this endpoint when you need to grant or revoke send-from permissions for additional wallet addresses on a StableEmail custom subdomain. This is ideal for multi-user or team setups where multiple wallets need to be authorized to send email from the same custom subdomain without transferring full ownership.

## Known failure modes

- Invalid subdomain format (must match pattern ^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$ with no consecutive hyphens)
- Invalid wallet address format (must be 0x followed by 40 hex characters)
- Subdomain not found or not owned by caller
- Wallet address already exists as signer (on add)
- Wallet address not found in signers list (on remove)
- Action enum value not 'add' or 'remove'

## How this service works

Manage authorized signers for a subdomain (free)

## Output

Confirmation that the specified wallet address has been added to or removed from the authorized signers list for the given subdomain on StableEmail.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stableemail-signers-2022181d/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)