# slotsUpdatesSubscribe

Subscribe to receive a notification from the validator on a variety of updates on every slot

{% hint style="danger" %}
This subscription is unstable. The format of this subscription may change in the future, and may not always be supported.
{% endhint %}

#### Parameters required for this RPC call

* No parameters required.

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "slotsUpdatesSubscribe"
}
```

{% endtab %}

{% tab title="Response" %}

```json
{
  "jsonrpc": "2.0",
  "result": 0,
  "id": 1
}
```

{% endtab %}
{% endtabs %}

**Notification Format:**

The notification will be an object with the following fields:

* `err: <string|undefined>` - The error message. Only present if the update is of type "dead".
* `parent: <u64|undefined>` - The parent slot. Only present if the update is of type "createdBank".
* `slot: <u64>` - The newly updated slot
* `stats: <object|undefined>` - The error message. Only present if the update is of type "frozen". An object with the following fields:
  * `maxTransactionsPerEntry: <u64>`,
  * `numFailedTransactions: <u64>`,
  * `numSuccessfulTransactions: <u64>`,
  * `numTransactionEntries: <u64>`,
* `timestamp: <i64>` - The Unix timestamp of the update in milliseconds
* `type: <string>` - The update type, one of:
  * "firstShredReceived"
  * "completed"
  * "createdBank"
  * "frozen"
  * "dead"
  * "optimisticConfirmation"
  * "root"

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

```json
{
  "jsonrpc": "2.0",
  "method": "slotsUpdatesNotification",
  "params": {
    "result": {
      "parent": 75,
      "slot": 76,
      "timestamp": 1625081266243,
      "type": "optimisticConfirmation"
    },
    "subscription": 0
  }
}
```

{% endtab %}
{% endtabs %}