curl --request POST \
  --url https://finceptbackend.share.zrok.io/quantlib/risk/var/marginal \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "portfolio_returns": [
    0.01,
    -0.018,
    0.012,
    -0.006,
    0.014
  ],
  "new_position_returns": [
    0.015,
    -0.028,
    0.02,
    -0.01,
    0.018
  ],
  "position_weight": 0.2,
  "confidence": 0.95
}
'

{
  "success": true,
  "data": {
    "marginal_var": 102350.5
  }
}