curl --request GET \
  --url https://api.mainnet.aptoslabs.com/decibel/api/v1/user_fee_rates \
  --header 'Authorization: Bearer <token>'

{
  "account": "<string>",
  "active_referral_discount": 123,
  "daily_user_volume": [
    {
      "date": "<string>",
      "maker_volume": "<string>",
      "taker_volume": "<string>",
      "volume": "<string>"
    }
  ],
  "fee_schedule": {
    "maker": 123,
    "referral_discount": 123,
    "taker": 123,
    "tiers": {
      "market_maker": [
        {
          "maker": 123,
          "maker_fraction_threshold": "<string>"
        }
      ],
      "vip": [
        {
          "maker": 123,
          "taker": 123,
          "volume_threshold": "<string>"
        }
      ]
    }
  },
  "fee_tier": 1,
  "user_maker_rate": 123,
  "user_taker_rate": 123
}