# StableEmail Read Subdomain Inbox Message

> StableEmail Read Subdomain Inbox Message 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).

Retrieves the full content of a single subdomain inbox message, including text, HTML body, and time-limited attachment download URLs.

## Facts

- Endpoint: POST https://stableemail.dev/api/subdomain/inbox/messages/read?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-read-21ef6fd7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dwM2VsrQZrzJ6AnuAi6oZ

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-read-21ef6fd7 -d '<json body>'
```

Example prompt: Fetch the full content of the StableEmail inbox message with ID msg_abc123 — I need the text body, HTML, and any attachment links.

## When to prefer this

Use this endpoint when you have a specific messageId from a StableEmail subdomain inbox and need to retrieve the full message content including HTML, plain text, and attachment links. Ideal for programmatic email reading workflows where messages arrive at a stableemail.dev subdomain address and you need to process or relay their content.

## Known failure modes

- messageId not found or does not exist — returns 404 or error response
- messageId is older than 90 days — content no longer available
- attachment download URLs have expired after 1 hour — need to re-fetch
- malformed or empty messageId — returns validation error
- payment failure or insufficient USDC balance — returns 402 Payment Required

## How this service works

Read a single subdomain inbox message ($0.001). Returns text, HTML, and attachment download URLs (1hr expiry). Message content available for 90 days from receipt.

## Output

Returns the full text and HTML body of the specified email message, along with download URLs for any attachments (URLs expire after 1 hour). Message content is accessible for up to 90 days from when it was received.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "messageId"
 ],
 "properties": {
  "messageId": {
   "type": "string",
   "minLength": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stableemail-read-21ef6fd7/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)