curl --request POST \
  --url https://finceptbackend.share.zrok.io/quantlib/numerical/linalg/outer \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "a": [
    1,
    2,
    3
  ],
  "b": [
    4,
    5
  ]
}
'

{
  "success": true,
  "data": {
    "result": [
      [
        4,
        5
      ],
      [
        8,
        10
      ],
      [
        12,
        15
      ]
    ]
  }
}