> For the complete documentation index, see [llms.txt](https://docs.getblock.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getblock.io/api-reference/solana-sol/minimumledgerslot-solana.md).

# minimumLedgerSlot - Solana

Example code for the minimumLedgerSlot JSON-RPC method. Complete guide on how to use the minimumLedgerSlot JSON-RPC method in the GetBlock Web3 documentation.

This method returns the lowest slot still present in the node's local ledger. The value increases over time as the node purges older slots.

## Parameters

This method does not accept any parameters.

## Request

{% tabs %}
{% tab title="cURL" %}
{% code overflow="wrap" %}

```bash
curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "minimumLedgerSlot",
    "params": [],
    "id": "getblock.io"
}'
```

{% endcode %}
{% endtab %}

{% tab title="@solana/web3.js" %}
{% code title="example.js" %}

```javascript
const { Connection } = require('@solana/web3.js');

const connection = new Connection('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/', 'confirmed');

const minSlot = await connection.getFirstAvailableBlock();

console.log(minSlot);
```

{% endcode %}
{% endtab %}

{% tab title="Request" %}
{% code title="example.py" %}

```python
import requests

response = requests.post(
    'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'minimumLedgerSlot',
        'params': [],
        'id': 'getblock.io'
    }
)

print(response.json()['result'])
```

{% endcode %}
{% endtab %}

{% tab title="Rust" %}
{% code title="example.rs" %}

```rust
use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "minimumLedgerSlot",
            "params": [],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}
```

{% endcode %}
{% endtab %}
{% endtabs %}

## Response

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": 386201344
}
```

## Response Parameters

| Parameter | Type   | Description                                     |
| --------- | ------ | ----------------------------------------------- |
| jsonrpc   | string | JSON-RPC protocol version ("2.0")               |
| id        | string | Request identifier matching the request         |
| result    | number | Lowest slot retained in the node's local ledger |

## Use Cases

* **Retention Checks**: Confirm a node still holds the slot range an application depends on
* **Purge Monitoring**: Track how quickly ledger cleanup advances on a dedicated node
* **Query Routing**: Send requests below this slot to an archival endpoint
* **Disk Planning**: Correlate retained slot depth with node storage capacity

## Error Handling

| Error Code | Message           | Description                                 |
| ---------- | ----------------- | ------------------------------------------- |
| -32603     | Internal error    | Node failed to read the ledger cleanup slot |
| -32005     | Node is unhealthy | The node has fallen behind the cluster tip  |