Request orderbook

{
    "id": "clientID1",
    "event": "request",
    "params": {
        "type": "orderbook",
        "symbol": "PERP_NEAR_USDC"
    }
}

{
    "id":"123r",
    "event":"request",
    "success":true,
    "ts":1618880432419,
    "data":{
        "symbol":"PERP_NEAR_USDC",
        "ts":1618880432380,
        "asks":[
            [
                15,
                0.443951
            ],
            [
                15.02,
                0.002566
            ],
            ...
        ],
        "bids":[
            [
                14.99,
                2.887466
            ],
            [
                14.76,
                2.034711
            ],
           ...
        ]
    }
}