> For the complete documentation index, see [llms.txt](https://bybt.gitbook.io/bybt/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bybt.gitbook.io/bybt/options/exchange-vol.md).

# Exchange Vol

## Get Exchange Vol 

<mark style="color:blue;">`GET`</mark> `https://open-api.bybt.com/api/pro/v1/option/vol/history/chart`

#### Query Parameters

| Name   | Type   | Description |
| ------ | ------ | ----------- |
| symbol | string | symbol      |

{% tabs %}
{% tab title="200 " %}

```
```

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{% endtabs %}