K-Line Subscription

Subscribe to real-time K-line data push for futures.

Subscription Format

{symbol}@kline_{interval} (e.g.: BTCUSD@kline_1m)

Supported Time Intervals

1m, 5m, 15m, 30m, 1h, 2h, 4h, 1d, 1w, 1mo

Subscribe Request

Can subscribe to multiple pairs and intervals simultaneously

{
  "action": "subscribe",
  "streams": [
    "BTCUSD@kline_1m",
    "ETHUSD@kline_5m"
  ]
}

Push Data Fields

Field	Type	Description
event	string	Event type: data
channel	string	Channel: kline
data.symbol	string	Contract symbol
data.interval	string	K-line interval
data.t	int64	K-line opening time (milliseconds)
data.o	string	Open price
data.h	string	High price
data.l	string	Low price
data.c	string	Close price (latest price of current K-line)
data.v	string	Volume
data.isClosed	bool	Is K-line closed (true=closed, false=in progress)
time	int64	Push timestamp (milliseconds)

Push Example

{
  "event": "data",
  "channel": "kline",
  "data": {
    "symbol": "BTCUSD",
    "interval": "1m",
    "t": 1736163000000,
    "o": "50000.00",
    "h": "50150.00",
    "l": "49980.00",
    "c": "50120.00",
    "v": "1000000",
    "isClosed": false
  },
  "time": 1736163000000
}

Unsubscribe

{
  "action": "unsubscribe",
  "streams": ["BTCUSD@kline_1m"]
}