> ## 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 Used MMRs

> Retrieve the list of MMRs (Merkle Mountain Ranges) used by a specific task

# Get Used MMRs

Retrieves the list of MMRs (Merkle Mountain Ranges) used by a specific task. This endpoint does not require authentication.

## Endpoint

```
GET /tasks/{task_uuid}/mmrs
```

## 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/mmrs \
  -H "Content-Type: application/json"
```

## Response

### Success Response (200 OK)

```json theme={null}
{
  "taskId": "01JPJ03YJT1A93D6NF56G4GVEQ",
  "mmrs": [
    {
      "id": "0x30314b345136303433515133424b4d42324e31394d4443595757",
      "root": "0x6e7be7495a7126588df5ce10e090b27ea87357b966cc5b4143d0845ee15af0e",
      "size": "0x2644",
      "chain_id": "0xaa37dc",
      "hashing_function": "poseidon"
    },
    {
      "id": "0x30314a4d484d31413242354d38455336505a57524a505354374d",
      "root": "0x8c03a541b8eb37ccfb5d11f2055556668df74acdc8c1fc184081e4a2ec4ccca7",
      "size": "0x0a813",
      "chain_id": "0xaa36a7",
      "hashing_function": "keccak"
    }
  ]
}
```

### Not Found Response (404)

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

### Server Error Response (500)

```json theme={null}
{
  "error": "Server error",
  "message": "Failed to decode MMR metadata"
}
```

## Response Fields

| Field  | Type   | Description                                     |
| ------ | ------ | ----------------------------------------------- |
| taskId | string | The unique identifier of the task               |
| mmrs   | array  | Array of MMR information objects                |
| error  | string | Error message (only present in error responses) |

### MMR Object Fields

| Field             | Type   | Description                                                                               |
| ----------------- | ------ | ----------------------------------------------------------------------------------------- |
| id                | string | The MMR identifier (hex string)                                                           |
| root              | string | The MMR root hash (hex string). For Keccak, this is the combined root\_low and root\_high |
| size              | string | The size of the MMR (hex string)                                                          |
| chain\_id         | string | The chain ID where this MMR is located (hex string)                                       |
| hashing\_function | string | The hashing function used: `"poseidon"` or `"keccak"`                                     |

## Notes

* No authentication is required for this endpoint
* The response includes all MMRs used by the task, regardless of their hashing function
* For Poseidon MMRs, the `root` field contains the single root value
* For Keccak MMRs, the `root` field contains the combined `root_high` and `root_low` values
* The `hashing_function` field explicitly indicates which hashing algorithm was used for each MMR
* This endpoint is useful for verifying which MMRs were used in the task execution