curl --request POST \
  --url https://api.iotools.cloud/v1/tool/curl-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "p": "-y",
  "q": "x",
  "r": "0",
  "x": "1",
  "y": "2",
  "z": "3"
}
'

{
  "tool": "curl-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "curlVector": "(0, 0, 2)",
    "curlX": "0",
    "curlY": "0",
    "curlZ": "2",
    "steps": "F(x, y, z) = (-y, x, 0)\n∂R/∂y = 0\n∂Q/∂z = 0\n∂P/∂z = 0\n∂R/∂x = 0\n∂Q/∂x = 1\n∂P/∂y = -1\ncurl F = (∂R/∂y − ∂Q/∂z, ∂P/∂z − ∂R/∂x, ∂Q/∂x − ∂P/∂y)\n       = (0, 0, 2)\nAt (x, y, z) = (1, 2, 3):\ncurl F = (0, 0, 2)"
  },
  "credits_used": 5,
  "credits_remaining": null
}