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

# slotsUpdatesSubscribe | Solana

> Subscribe to detailed Solana slot updates with slotsUpdatesSubscribe. Get real-time WebSocket notifications with timing data for each slot lifecycle stage.

## Parameters

None. This method does not accept any parameters.

## Response

* `result` - An integer subscription id (needed to unsubscribe)

* `subscription` - An object containing detailed slot information:

  * `slot` - The current slot height

  * `timestamp` - The current estimated production time (as Unix timestamp) of the slot

  * `type` - The type of slot update:

    * `"firstShredReceived"` - The first shred of the slot was received
    * `"completed"` - The slot was completed
    * `"createdBank"` - The bank for the slot was created
    * `"frozen"` - The bank for the slot was frozen
    * `"dead"` - The bank for the slot was marked as dead
    * `"optimisticConfirmation"` - The slot was optimistically confirmed
    * `"root"` - The slot was rooted

## `slotsUpdatesSubscribe` code examples

This example subscribes to detailed slot updates.

<Info>
  Note that subscriptions require a WebSocket connection and [WebSocket cat](https://www.npmjs.com/package/wscat) for you to use this method in the console.

  Install WebSocket cat with:

  `npm install -g wscat`
</Info>

<CodeGroup>
  ```shell wscat theme={"system"}
  $ wscat -c YOUR_CHAINSTACK_WEBSOCKET_ENDPOINT
  # Wait for the connection to be established

  Connected (press CTRL+C to quit)

  > {"jsonrpc":"2.0","id":1,"method":"slotsUpdatesSubscribe"}
  ```
</CodeGroup>

## Use case

The `slotsUpdatesSubscribe` method is valuable for applications that need detailed monitoring of the Solana blockchain's slot processing. Common use cases include:

* Performance monitoring: Track detailed slot processing times and states
* Debugging: Monitor slot processing stages for troubleshooting
* Chain health monitoring: Track slot completion and confirmation rates
* Analytics: Gather detailed metrics about blockchain performance
* Advanced timing: Coordinate operations based on specific slot states

By subscribing to detailed slot updates, applications can gain deeper insights into the blockchain's operation and implement more sophisticated timing and monitoring systems.