【公共】资金费率频道

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

{ 
  "action": "request", 
  "args":["futures/fundingRate:BTCUSDT"]
}

{
    "data": {
        "symbol": "BTCUSDT",
        "fundingRate": "0.000098800809",
        "fundingTime": 1732525864000,
        "nextFundingRate": "0.0000947",
        "nextFundingTime": 1732550400000,
        "funding_upper_limit": "0.0375",
        "funding_lower_limit": "-0.0375",
        "ts": 1732525864601
    },
    "group": "futures/fundingRate:BTCUSDT"
}