curl --request POST \
  --url https://api.iotools.cloud/v1/tool/acreage-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "shape": "rectangle",
  "unit": "feet",
  "length": "200",
  "width": "100"
}
'

{
  "tool": "acreage-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "results": [
      {
        "metric": "Acres",
        "value": "0.459137"
      },
      {
        "metric": "Hectares",
        "value": "0.185806"
      },
      {
        "metric": "Square feet",
        "value": "20000.00"
      },
      {
        "metric": "Square meters",
        "value": "1858.06"
      }
    ],
    "summary": "0.459137 acres (1858.06 m²)"
  },
  "credits_used": 5,
  "credits_remaining": null
}