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Push interval: 15s 
{
    "id": "clientID11",
    "topic": "PERP_ETH_USDC@estfundingrate",
    "event": "subscribe"
}
Parameters
NameTypeRequiredDescription
idstringYid generate by client
eventstringYsubscribe/unsubscribe
topicstringN{symbol}@estfundingrate
{
   "id":"clientID11",
   "event":"subscribe",
   "success":true,
   "ts":1682242408023
}

{
   "topic":"PERP_ETH_USDC@estfundingrate",
   "ts":1682242440000,
   "data":{
      "symbol":"PERP_ETH_USDC",
      "fundingRate":0.00046875,
      "fundingTs":1682242440000
   }
}