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

# Line Changes

> Subscribe to real-time line changes

<Warning>
  This WebSocket API will be deprecated on July 1, 2026. See the [Migration Guide](/api-reference/centrifugo-migration) to move to the Centrifuge-based API.
</Warning>

Subscribe to all line changes. Messages are sent for particular combinations of event IDs and market types. Note that only market types with lines will have updates sent. See [the active markets section](/api-reference/get-markets-active) for details on which types have lines.

**CHANNEL NAME FORMAT**

`main_line`

**MESSAGE PAYLOAD FORMAT**

| Name          | Type   | Description                                             |
| ------------- | ------ | ------------------------------------------------------- |
| marketHash    | string | The market which is now the main line for this event ID |
| marketType    | number | The type of market this update refers to.               |
| sportXEventId | string | The event ID for this update                            |

To get the actual line, you'll have to fetch the market using the `marketHash`

***

```javascript theme={null}
const channel = realtime.channels.get('main_line');
channel.subscribe((message) => {
  console.log(message.data);
});
```

The above command returns JSON structured like this:

```json theme={null}
{
  "marketHash": "0x38cceead7bda65c18574a34994ebd8af154725d08aa735dcbf26247a7dcc67bd",
  "marketType": 3,
  "sportXEventId": "L7178624"
}
```