---
title: Create a guardrail assignment
url: https://runapi.ai/docs/api/management/guardrail-assignments/create.md
canonical: https://runapi.ai/docs/api/management/guardrail-assignments/create
locale: en
---

# Create a guardrail assignment

Attach one guardrail to a Standard API key or an account member.

## Endpoint

POST /api/v1/guardrail_assignments

Base URL: https://runapi.ai

API version: v1

Authentication: Authorization: Bearer YOUR_MANAGEMENT_API_KEY


Authorization: Account admins can assign any eligible target. Non-admin users can assign only their own Standard API keys.

## Request

Send values only in the listed request location.

### JSON body

```json
{
  "account_user_id": {
    "description": "Account-member prefix ID. This target requires an account admin.",
    "required": false,
    "type": "string"
  },
  "api_token_id": {
    "description": "Standard API key prefix ID. Provide exactly one target ID.",
    "required": false,
    "type": "string"
  },
  "guardrail_id": {
    "description": "Guardrail prefix ID.",
    "required": true,
    "type": "string"
  }
}
```

## Success response

HTTP 201 - POST /api/v1/guardrail_assignments

```json
{
  "account_user_id": null,
  "api_token_id": "token_123",
  "created_at": "2026-07-27T10:00:00.000Z",
  "guardrail_id": "guardrail_123",
  "id": "guardrail_assignment_123"
}
```

## Error response (401)

HTTP 401

```json
{
  "error": "Authentication required"
}
```

## Error response (403)

HTTP 403

```json
{
  "error": "Management API key required"
}
```

## Error response (400)

HTTP 400

```json
{
  "error": "page must be an integer"
}
```

## Error response (403)

HTTP 403

```json
{
  "error": "Forbidden"
}
```

## Error response (404)

HTTP 404

```json
{
  "error": "Resource not found"
}
```

## Error response (422)

HTTP 422

```json
{
  "errors": {
    "base": [
      "Validation failed"
    ]
  }
}
```

## cURL example



### curl

```curl
curl -X POST https://runapi.ai/api/v1/guardrail_assignments \
  -H 'Authorization: Bearer YOUR_MANAGEMENT_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"guardrail_id":"guardrail_123","api_token_id":"token_123"}'
```

## Related reference

- [Guardrail Assignments](/docs/api/management/guardrail-assignments)
- [Guardrail Assignment object](/docs/api/management/guardrail-assignments/object)