curl --request POST \
  --url https://api.iotools.cloud/v1/tool/square-footage-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "shape": "rectangle",
  "unit": "feet",
  "length": "20",
  "width": "15"
}
'

{
  "tool": "square-footage-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "results": [
      {
        "metric": "Square feet",
        "value": "300.00 sq ft"
      },
      {
        "metric": "Square meters",
        "value": "27.87 m²"
      },
      {
        "metric": "Square yards",
        "value": "33.33 sq yd"
      },
      {
        "metric": "Square inches",
        "value": "43200.00 sq in"
      },
      {
        "metric": "Estimated cost",
        "value": "-"
      }
    ],
    "summary": "300.00 sq ft"
  },
  "credits_used": 5,
  "credits_remaining": null
}