K-line Stream

Subscribe to K-line pushes for a specified futures trading pair and interval. Futures-specific: supports the 1s interval.

• Channel Format: kline@{symbol},{interval}
• Supported Intervals: 1s 1m 3m 5m 15m 30m 1h 2h 4h 6h 8h 12h 1d 3d 1w 1M
• Push Frequency: Real-time when data changes; for 1s, one closed K-line per second
• Access: Public

Subscribe Request

{
  "op": "subscribe",
  "args": [
    "kline@BTC_USDT,1s",
    "kline@BTC_USDT,1m"
  ]
}

Unsubscribe

{
  "op": "unsubscribe",
  "args": ["kline@BTC_USDT,1s"]
}

Push Example

{
  "ch": "kline@BTC_USDT,1s",
  "d": {
    "s": "BTC_USDT",
    "i": "1s",
    "ot": 1768205280000,
    "ct": 1768205280999,
    "o": "49000",
    "h": "49100",
    "l": "48900",
    "c": "49050",
    "v": "12.345",
    "qv": "605000.50",
    "tc": 156,
    "bv": "6.123",
    "bqv": "300000.25",
    "x": true
  }
}

Push Fields

Field	Type	Description
s	string	Trading pair
i	string	Interval (1s, 1m, ...)
ot	number	Open time (milliseconds)
ct	number	Close time (milliseconds)
o	string	Open price
h	string	High price
l	string	Low price
c	string	Close price / latest price
v	string	Volume (base asset)
qv	string	Turnover (quote asset)
tc	number	Number of trades
bv	string	Taker buy volume
bqv	string	Taker buy turnover
x	boolean	Whether the K-line is closed