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

# Get Task Output Preimage

> Retrieve the output tree root preimage for a specific HDP task

# Get Task Output Preimage

Retrieves the output tree root preimage for a specific HDP task. This endpoint does not require authentication.

## Endpoint

```
GET /tasks/{task_uuid}/output_preimage
```

## Path Parameters

| Parameter  | Type   | Description                              |
| ---------- | ------ | ---------------------------------------- |
| task\_uuid | string | The unique identifier (UUID) of the task |

## Example Request

```bash theme={null}
curl -X GET https://staging.hdp.api.herodotus.cloud/tasks/01JPJ03YJT1A93D6NF56G4GVEQ/output_preimage \
  -H "Content-Type: application/json"
```

## Response

### Success Response (200 OK)

```json theme={null}
{
  "taskId": "01JPJ03YJT1A93D6NF56G4GVEQ",
  "outputPreimage": ["0x1", "0x2", "0x3", "0x4"]
}
```

### Not Found Response (404)

```json theme={null}
{
  "error": "Task not found",
  "taskId": "01JPJ03YJT1A93D6NF56G4GVEQ"
}
```

### Response Fields

| Field          | Type          | Description                                                     |
| -------------- | ------------- | --------------------------------------------------------------- |
| taskId         | string        | The unique identifier of the task                               |
| outputPreimage | array \| null | Array of preimage values (hex strings) or null if not available |

## Notes

* No authentication is required for this endpoint
* The output preimage is only available for completed tasks
* Returns null if the task doesn't have an output preimage stored
* The preimage values are hex-encoded strings representing the output tree root preimage