> ## Documentation Index
> Fetch the complete documentation index at: https://docs.leadlex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# List Email Threads

> Paginate over synchronized email threads in the workspace

## Request

### Query Parameters

<ParamField query="page" type="integer" default="1">
  Page number for pagination.
</ParamField>

<ParamField query="per_page" type="integer" default="25">
  Results per page. Maximum 100.
</ParamField>

<ParamField query="contact_id" type="string">
  Return only threads that include the given contact.
</ParamField>

<ParamField query="deal_id" type="string">
  Return only threads linked to the given deal.
</ParamField>

<ParamField query="unread" type="boolean">
  Filter to threads with at least one unread message.
</ParamField>

<ParamField query="after" type="string">
  ISO 8601 lower-bound filter on the thread's most recent message.
</ParamField>

### Headers

```
Authorization: Bearer wbk_your_api_key_here
```

## Response

<ResponseField name="data" type="object">
  <Expandable title="properties">
    <ResponseField name="threads" type="array">
      Array of thread summaries

      <Expandable title="Thread object">
        <ResponseField name="id" type="string">Thread identifier</ResponseField>
        <ResponseField name="subject" type="string">Latest subject line</ResponseField>
        <ResponseField name="snippet" type="string">Short preview of the most recent message</ResponseField>
        <ResponseField name="message_count" type="integer">Number of messages in the thread</ResponseField>
        <ResponseField name="unread_count" type="integer">Number of unread messages</ResponseField>
        <ResponseField name="participants" type="array">Array of participant email addresses</ResponseField>
        <ResponseField name="contact_ids" type="array">Linked contact UUIDs</ResponseField>
        <ResponseField name="deal_id" type="string">Linked deal UUID, if any</ResponseField>
        <ResponseField name="last_message_at" type="string">ISO 8601 timestamp</ResponseField>
      </Expandable>
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="meta" type="object">
  Pagination metadata: `page`, `per_page`, and `total`.
</ResponseField>

Responses include `X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Reset`, and `X-Request-ID`.

<CodeGroup>
  ```bash cURL theme={null}
  curl "https://data.leadlex.com/functions/v1/api-gateway/v1/email/threads?per_page=50&unread=true" \
    -H "Authorization: Bearer wbk_your_api_key_here"
  ```

  ```python Python theme={null}
  import requests

  API_KEY = "wbk_your_api_key_here"
  BASE_URL = "https://data.leadlex.com/functions/v1/api-gateway"

  params = {"per_page": 50, "unread": "true"}
  r = requests.get(
      f"{BASE_URL}/v1/email/threads",
      headers={"Authorization": f"Bearer {API_KEY}"},
      params=params,
  )
  for thread in r.json()["data"]["threads"]:
      print(thread["subject"], thread["last_message_at"])
  ```

  ```javascript JavaScript theme={null}
  const url = new URL('https://data.leadlex.com/functions/v1/api-gateway/v1/email/threads');
  url.searchParams.set('per_page', '50');
  url.searchParams.set('unread', 'true');

  const res = await fetch(url, {
    headers: { Authorization: 'Bearer wbk_your_api_key_here' },
  });
  const { data } = await res.json();
  console.log(data.threads.length);
  ```
</CodeGroup>

### Example Response

```json theme={null}
{
  "data": {
    "threads": [
      {
        "id": "18c9a4b2e7ff21aa",
        "subject": "Proposal for Series B counsel",
        "snippet": "Thanks for the introduction, we'd love to schedule a call...",
        "message_count": 4,
        "unread_count": 1,
        "participants": ["jane@example.com", "team@emasex.de"],
        "contact_ids": ["123e4567-e89b-12d3-a456-426614174000"],
        "deal_id": null,
        "last_message_at": "2026-04-17T09:14:00Z"
      }
    ]
  },
  "meta": { "page": 1, "per_page": 50, "total": 137 }
}
```

## Errors

| Status | Code                       | Description                                               |
| ------ | -------------------------- | --------------------------------------------------------- |
| 401    | `invalid_key`              | Invalid or expired API key                                |
| 403    | `insufficient_permissions` | Missing `read:email` permission, or no connected provider |
| 429    | `rate_limited`             | Rate limit exceeded                                       |