curl --request POST \
  --url https://api.easierprop.com/api/accounts/{id}/margin-check \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "symbol": "EURUSD",
  "side": "buy",
  "volume": 0.01
}
'

{
  "ok": true,
  "data": {
    "symbol": "EURUSD",
    "side": "buy",
    "volume": 0.01,
    "required_margin": 500,
    "free_margin": 9642.5,
    "can_trade": true,
    "margin_usage_pct": 4.93,
    "remaining_after": 9142.5
  }
}