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

# EndUser

## Fields

| Field | Type | Required | Description | Example |
| - | - | - | - | - |
| `created_at` | [date](https://docs.python.org/3/library/datetime.html#date-objects) | ✅ | Registration creation time. | 2026-09-16T12:00:00Z |
| `is_active` | *bool* | ✅ | Whether this registration is active. Not an inference authorization decision. | true |
| `updated_at` | [date](https://docs.python.org/3/library/datetime.html#date-objects) | ✅ | Last registration lifecycle update time. | 2026-09-16T12:00:00Z |
| `user` | *str* | ✅ | Immutable case-sensitive tracking string supplied as user on inference requests or as external.user on API keys: 1 to 512 characters, well-formed Unicode, no NUL, no surrounding whitespace. URL-encode it in resource paths; an ID of `.` or `..` cannot be addressed by path, so look it up with the list filter. | employee\_123 |