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

# Heartbeat

> Automatic heartbeat messages to verify the connection is alive

UWS
uws.kraken.com/v2/public
heartbeat

The `heartbeat` channel provides a mechanism to verify that the connection is alive.

Heartbeat messages are sent approximately once every second **in the absence of any other channel updates**.

There is no option to directly request a `heartbeat` subscription, the heartbeats will be automatically generated on subscription to any channel.

## Update

The channel name is the indicator of a heartbeat, there is no other data in the heartbeat payload.

**channel** `string`

Value: `heartbeat`

```json Example: Heartbeat theme={null}
{
    "channel": "heartbeat"
}
```