{
    "BU99-1-TA99-1-BJ":
    {
      "name": "沥青/TA指数比",
      "exchange": "SPD",
      "leg1_symbol": "BU99",
      "leg1_ratio": 1,
      "leg2_symbol": "TA99",
      "leg2_ratio": 1,
      "is_ratio": true,
      "size": 100,
      "margin_rate": 0.2,
      "price_tick": 0.01
    },
    "JM99-1-I99-1-BJ":
    {
       "name": "焦煤/铁矿指数比",
      "exchange": "SPD",
      "leg1_symbol": "JM99",
      "leg1_ratio": 1,
      "leg2_symbol": "I99",
      "leg2_ratio": 1,
      "price_tick": 0.01,
      "is_ratio": true,
      "size": 100,
      "margin_rate": 0.2
    },
    "jm2005-1-i2005-1-BJ":
    {
       "name": "焦煤/铁矿主力比",
        "exchange": "SPD",
      "leg1_symbol": "jm2005",
      "leg1_ratio": 1,
      "leg2_symbol": "i2005",
      "leg2_ratio": 1,
      "price_tick": 0.01,
      "is_ratio": true,
      "size": 100,
      "margin_rate": 0.2
    }
  }