# getFirstAvailableBlock

Returns the slot of the lowest confirmed block that has not been purged from the ledger.

This method will use `30` [Compute Units](/v1/about/billing.md).

***

## **Parameters**

None.

## Returns

`result` An integer slot of the lowest confirmed block as u64 (64-bit unsigned integer) integer.

```bash
// Result
{
	"jsonrpc": "2.0",
	"result": 319916978,
	"id": 1
}
```

{% tabs %}
{% tab title="mainnet" %}

<pre class="language-bash"><code class="lang-bash"><strong>curl https://mainnet.solana.validationcloud.io/v1/&#x3C;YOUR_API_KEY_HERE> \
</strong>    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","id":1, "method":"getFirstAvailableBlock"}'
    
</code></pre>

{% endtab %}

{% tab title="devnet" %}

```bash
curl https://devnet.solana.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","id":1, "method":"getFirstAvailableBlock"}'
    
```

{% endtab %}
{% endtabs %}


---

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