> For the complete documentation index, see [llms.txt](https://dev.guardian.hedera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.guardian.hedera.com/developer-tools-and-resources/api-reference/schema-creation-using-the-guardian-apis/returns-all-schemas-related-to-the-topic.md).

# Returns All Schemas Related to the Topic

**`GET /api/v1/schemas/{topicId}`**

Returns a paginated list of all schemas associated with the specified Hedera topic ID.

**Authentication:** Bearer token required (`Authorization: Bearer <token>`)

**Permission:** `Permissions.SCHEMAS_SCHEMA_READ`

***

## Request

### Path Parameters

| Parameter | Type   | Required | Description                                                   |
| --------- | ------ | -------- | ------------------------------------------------------------- |
| `topicId` | string | Yes      | The Hedera topic ID to filter schemas by (e.g. `0.0.1234567`) |

### Query Parameters

| Parameter   | Type   | Required | Default | Description                                     |
| ----------- | ------ | -------- | ------- | ----------------------------------------------- |
| `pageIndex` | number | No       | 0       | Zero-based page index (number of pages to skip) |
| `pageSize`  | number | No       | 20      | Number of items to return per page              |
| `category`  | string | No       | —       | Schema category filter (e.g. `POLICY`)          |

***

## Response

### Success Response

**Status:** `200 OK`

The response includes an `X-Total-Count` header with the total number of matching schemas.

```json
[
  {
    "id": "63e3e5e8a01b3c001234abcd",
    "uuid": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "name": "Carbon Offset Schema",
    "description": "Schema for carbon offset reporting",
    "entity": "VC",
    "status": "PUBLISHED",
    "version": "1.0.0",
    "topicId": "0.0.1234567",
    "owner": "example_user"
  }
]
```

### Error Responses

| Status                      | Description               |
| --------------------------- | ------------------------- |
| `401 Unauthorized`          | Missing or invalid token  |
| `403 Forbidden`             | Insufficient permissions  |
| `500 Internal Server Error` | Unexpected server failure |