> ## 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.

# Create Activity

> Log a new activity (call, email, meeting, note, AI action) against a contact or deal

Use this endpoint to record any user or agent action — a call, a sent email, a meeting, a handwritten note — so it appears on the contact and deal timeline.

## Request

### Headers

```
Authorization: Bearer wbk_your_api_key_here
Content-Type: application/json
```

<Note>
  Requires an API key with the `activities:write` permission. Fires the `activity.created` webhook event.
</Note>

### Body Parameters

<ParamField body="type" type="string" required>
  Activity type (e.g., `call`, `email`, `email_sent`, `email_replied`, `meeting`, `note`, `task_completed`, `ai_action`). Free-form — custom types are allowed.
</ParamField>

<ParamField body="title" type="string">
  Short human-readable title (max 500 chars)
</ParamField>

<ParamField body="description" type="string">
  Full description or body (markdown supported)
</ParamField>

<ParamField body="contact_id" type="string">
  UUID of the related contact
</ParamField>

<ParamField body="deal_id" type="string">
  UUID of the related deal
</ParamField>

<ParamField body="entity_type" type="string">
  Polymorphic entity type (e.g., `campaign`, `task`, `list`) when the activity relates to something other than a contact or deal
</ParamField>

<ParamField body="entity_id" type="string">
  UUID of the polymorphic entity
</ParamField>

<ParamField body="entity_name" type="string">
  Human-readable name of the entity (for timeline display)
</ParamField>

<ParamField body="metadata" type="object">
  Arbitrary structured JSON for type-specific data (call duration, email subject, attendees, etc.). Max 8 KB serialized.
</ParamField>

## Response

<ResponseField name="data" type="object">
  <Expandable title="properties">
    <ResponseField name="activity" type="object">
      <Expandable title="Activity object">
        <ResponseField name="id" type="string">Newly created activity UUID</ResponseField>
        <ResponseField name="type" type="string">Activity type</ResponseField>
        <ResponseField name="title" type="string">Title</ResponseField>
        <ResponseField name="description" type="string">Description</ResponseField>
        <ResponseField name="contact_id" type="string">Contact UUID (nullable)</ResponseField>
        <ResponseField name="deal_id" type="string">Deal UUID (nullable)</ResponseField>
        <ResponseField name="entity_type" type="string">Polymorphic entity type</ResponseField>
        <ResponseField name="entity_id" type="string">Polymorphic entity UUID</ResponseField>
        <ResponseField name="entity_name" type="string">Entity display name</ResponseField>
        <ResponseField name="metadata" type="object">Structured data</ResponseField>
        <ResponseField name="created_by_user_id" type="string">UUID of the creating user</ResponseField>
        <ResponseField name="created_date" type="string">ISO 8601 timestamp</ResponseField>
      </Expandable>
    </ResponseField>
  </Expandable>
</ResponseField>

<CodeGroup>
  ```bash cURL theme={null}
  curl -X POST https://data.leadlex.com/functions/v1/api-gateway/v1/activities \
    -H "Authorization: Bearer wbk_your_api_key_here" \
    -H "Content-Type: application/json" \
    -d '{
      "type": "call",
      "title": "Discovery call with Jane",
      "description": "Discussed Q2 outsourcing plans; next step is proposal.",
      "contact_id": "123e4567-e89b-12d3-a456-426614174000",
      "deal_id": "3f8e1d2c-4b5a-6d7e-8f9a-0b1c2d3e4f5a",
      "metadata": {"duration_minutes": 32, "direction": "outbound"}
    }'
  ```

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

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

  response = requests.post(
      f"{BASE_URL}/v1/activities",
      headers={
          "Authorization": f"Bearer {API_KEY}",
          "Content-Type": "application/json",
      },
      json={
          "type": "call",
          "title": "Discovery call with Jane",
          "description": "Discussed Q2 outsourcing plans; next step is proposal.",
          "contact_id": "123e4567-e89b-12d3-a456-426614174000",
          "deal_id": "3f8e1d2c-4b5a-6d7e-8f9a-0b1c2d3e4f5a",
          "metadata": {"duration_minutes": 32, "direction": "outbound"},
      },
  )
  ```

  ```javascript JavaScript theme={null}
  await fetch('https://data.leadlex.com/functions/v1/api-gateway/v1/activities', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer wbk_your_api_key_here',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      type: 'call',
      title: 'Discovery call with Jane',
      description: 'Discussed Q2 outsourcing plans; next step is proposal.',
      contact_id: '123e4567-e89b-12d3-a456-426614174000',
      deal_id: '3f8e1d2c-4b5a-6d7e-8f9a-0b1c2d3e4f5a',
      metadata: { duration_minutes: 32, direction: 'outbound' },
    }),
  });
  ```
</CodeGroup>

### Example Response

```json theme={null}
{
  "data": {
    "activity": {
      "id": "act_7f3c4d2a-1b8e-4a9c-9d6f-2e5b8c7a1f3d",
      "type": "call",
      "title": "Discovery call with Jane",
      "description": "Discussed Q2 outsourcing plans; next step is proposal.",
      "contact_id": "123e4567-e89b-12d3-a456-426614174000",
      "deal_id": "3f8e1d2c-4b5a-6d7e-8f9a-0b1c2d3e4f5a",
      "entity_type": null,
      "entity_id": null,
      "entity_name": null,
      "metadata": { "duration_minutes": 32, "direction": "outbound" },
      "created_by_user_id": "9a8b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d",
      "created_date": "2026-04-17T14:23:05Z"
    }
  }
}
```

## Errors

| Status | Code                       | Description                            |
| ------ | -------------------------- | -------------------------------------- |
| 400    | `missing_required_field`   | `type` is missing                      |
| 400    | `metadata_too_large`       | Serialized `metadata` exceeds 8 KB     |
| 401    | `invalid_key`              | Invalid or expired API key             |
| 403    | `insufficient_permissions` | Missing `activities:write` permission  |
| 404    | `contact_not_found`        | Referenced `contact_id` does not exist |
| 404    | `deal_not_found`           | Referenced `deal_id` does not exist    |
| 429    | `rate_limited`             | Rate limit exceeded                    |