# AgentMail List Inbox Threads

> AgentMail List Inbox Threads is a free API for AI agents from x402.api.agentmail.to, Free, status unknown (last checked 2026-09-10).

Lists email threads in a specific AgentMail inbox by inbox ID

## Facts

- Endpoint: GET https://x402.api.agentmail.to/v0/inboxes/%7Binbox_id%7D/threads
- Price: Free
- Status: unknown
- Last checked: 2026-09-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentmail-list-inbox-threads-bb3c1f29
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XJ2gJOEIbE9ZHkVbZy1Rt

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 agentmail-list-inbox-threads-bb3c1f29
```

Example prompt: Show me all the email threads in my AgentMail inbox with ID 'inbox_abc123' so I can see what conversations have come in.

## When to prefer this

Use this endpoint when you need to enumerate all email threads within a specific AgentMail inbox by its ID. Ideal for AI agents that need to monitor, triage, or process incoming email conversations programmatically. Prefer this over message-level endpoints when you want a thread-grouped view of conversations rather than individual messages.

## Known failure modes

- Invalid or non-existent inbox_id returns 404 not found
- Unauthorized access returns 401 or 403 if credentials are missing or invalid
- Empty result set if the inbox has no threads
- Rate limiting or quota exceeded returns 429
- Malformed inbox_id format may return 400 bad request

## How this service works

Service: AgentMail API (/v0/inboxes/{inbox_id}/threads)

## Output

A JSON list of email threads belonging to the specified inbox, including thread metadata such as thread IDs, subjects, participants, and message counts.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentmail-list-inbox-threads-bb3c1f29/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.api.agentmail.to](https://www.zero.xyz/host/x402.api.agentmail.to/llms.txt)