約定情報（全体）

{
    "current_page":1,
    "total_pages":2,
    "models":[
        {
            "id":258705118,
            "quantity":0.00216954,
            "price":1007884.0,
            "taker_side":"sell",
            "created_at":1580805340
        },
        ...
    ]
}