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

# Overview

> Subscribe to realtime market, order, and account updates over Pusher WebSockets.

Futuur uses [Pusher](https://pusher.com/docs/channels/using_channels/client-api-overview/) to deliver realtime data to clients over WebSocket connections. Use the global `event` channel for market-wide feeds, `event-{event_id}` for per-event BBO and order-book updates, and private channels for account-specific order and position updates.

Terminology: **event** = a question; **market** = an outcome.

<Note>
  Examples below use `https://api.futuur.com/v2.0`. Private channel authorization calls `POST https://api.futuur.com/v2.0/pusher/auth/`. See [Authentication](/authentication) for HMAC signing and [Authorization](/api-reference/websocket/authorization) for private channel setup.
</Note>

## Client setup

Include the Pusher JS client:

```html theme={null}
<script src="https://js.pusher.com/8.4.0/pusher.min.js"></script>
```

Initialize Pusher and subscribe to a channel:

```html theme={null}
<script>
    Pusher.logToConsole = true; // omit in production

    var pusher = new Pusher("9011f7eac38e825792d5", {
        cluster: "us2",
    });

    var channel = pusher.subscribe("event");
    channel.bind("best-prices-change", function (data) {
        console.log("Best prices changed:", data);
    });
</script>
```

## Next steps

* [Authorization](/api-reference/websocket/authorization) — authorize private user channels with HMAC
* [Channels and events](/api-reference/websocket/channels-and-events) — full channel and event catalog with payloads

## Related

* [Order book](/api-reference/markets/order-book) — REST endpoint for full depth beyond top-N
* [Reading the order book](/guides/reading-the-order-book) — interpret bid/ask depth
* [Authentication](/authentication) — HMAC signing for private channel auth