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

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