{
"id": "1545910660739",
"action": "SUBSCRIBE", // or UNSUBSCRIBE
"channel":"funding-fee",
"symbol": "XBTUSDTM"
}
{
"T": "funding-fee",
"P": 1731899129000,
"d": {
"s": "XBTUSDTM",
"fr": "-0.002966",
"ft": 1551770410000,
"nt": 1551770412000,
"gl": 28800000,
"fc": "0.00375",
"ff": "-0.00375"
}
}