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

# Subscription

Users can subscribe to one or more channels, and the total length of multiple channels cannot exceed 4096 bytes

### Subscribe Message Format

`{"action":"subscribe","args":["<topic>"]}`

#### Parameter Instructions

* `action` = subscribe
* `args` = The content of the args array is the subscribed topic
* `topic` is composed of `<channel>:<filter>`
  * channel is composed of business/name
  * filter can filter data, refer to the description of each channel for details

### Example

1. Send message to WOO X Pro server

   `{"action":"subscribe","args":["futures/klineBin1m:BTCUSDT"]}`

2. The WOO X Pro server returns the subscription result, success=true means the subscription is successful

   `{"action":"subscribe","group":"futures/klineBin1m:BTCUSDT","success":true,"request":{"action":"subscribe","args":["futures/klineBin1m:BTCUSDT"]}}`