# StableEmail Subdomain Inbox Message List

> StableEmail Subdomain Inbox Message List is a paid API for AI agents from StableEmail at stableemail.dev, paid per call via MPP or x402, $0.001/call, status unknown (last checked 2026-10-10).

Lists messages in a StableEmail custom subdomain inbox with pagination support

## Facts

- Endpoint: POST https://stableemail.dev/api/subdomain/inbox/messages?utm_source=zero.xyz
- Price: $0.001/call
- Payment: MPP, x402
- Status: unknown
- Last checked: 2026-10-10
- 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-messages-a0af4d20
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W9g-kFdZ-pGIuj90pVSWU

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-messages-a0af4d20 -d '<json body>'
```

Example prompt: Show me the last 20 messages in the 'hello' inbox on my 'mycompany' subdomain at StableEmail.

## When to prefer this

Use this endpoint when you need to list or browse messages in a custom StableEmail subdomain inbox (as opposed to a standard forwarding inbox). Choose this over the standard inbox messages endpoint when the email address belongs to a purchased custom subdomain. Ideal for polling or monitoring a subdomain inbox for new arrivals.

## Known failure modes

- Invalid subdomain format (must match pattern ^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$ with no double hyphens) returns validation error
- Invalid localPart format returns schema validation error
- Subdomain not found or not owned returns 404
- Insufficient USDC balance returns 402 payment required
- Invalid or expired cursor returns pagination error
- Limit out of range (must be 1-100) returns validation error

## How this service works

List messages in a subdomain inbox ($0.001)

## Output

Returns a paginated list of email messages in the specified subdomain inbox, including message metadata and a cursor for fetching the next page. Up to 100 messages per request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "subdomain",
  "localPart"
 ],
 "properties": {
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1
  },
  "cursor": {
   "type": "string",
   "minLength": 1
  },
  "localPart": {
   "type": "string",
   "pattern": "^[a-z0-9][a-z0-9._+-]{0,62}[a-z0-9]$",
   "maxLength": 64,
   "minLength": 1
  },
  "subdomain": {
   "type": "string",
   "allOf": [
    {
     "pattern": "^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$"
    },
    {
     "pattern": "^(?!.*--)"
    }
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stableemail-messages-a0af4d20/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)