合约 V3 websock API公有频道K线数据本页总览K线数据 描述 订阅K线数据 推送频率 Real Time 订阅频道 candles_minute_1 candles_minute_5 candles_minute_10 candles_minute_15 candles_minute_30 candles_hour_1 candles_hour_2 candles_hour_4 candles_hour_6 candles_hour_12 candles_day_1 candles_day_3 candles_week_1 candles_month_1 请求参数