curl --request GET \
  --url https://api.perpo.trade/v1/broker/fee_rate/default \
  --header 'perpo-account-id: <perpo-account-id>' \
  --header 'perpo-key: <perpo-key>' \
  --header 'perpo-signature: <perpo-signature>' \
  --header 'perpo-timestamp: <perpo-timestamp>'

{
  "success": true,
  "timestamp": 1702989203989,
  "data": {
    "maker_fee_rate": 0.0005,
    "taker_fee_rate": 0.001,
    "rwa_taker_fee_rate": 0.0001,
    "rwa_maker_fee_rate": 0.0001
  }
}