curl --request POST \
  --url https://finceptbackend.share.zrok.io/quantlib/numerical/differentiation/hessian \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "func_name": "sphere",
  "x": [
    2,
    3
  ],
  "h": 0.00001
}
'

{
  "success": true,
  "data": {
    "function": "sphere",
    "x": [
      2,
      3
    ],
    "hessian": [
      [
        2,
        0
      ],
      [
        0,
        2
      ]
    ]
  }
}