curl --request POST \
  --url https://api.iotools.cloud/v1/tool/paver-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "unitSystem": "metric",
  "projectLength": "6",
  "projectWidth": "4",
  "paverLength": "400",
  "paverWidth": "200",
  "jointGap": "5",
  "wastagePct": "10",
  "pricePerPaver": "2.50"
}
'

{
  "tool": "paver-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "results": [
      {
        "metric": "Project area",
        "value": "24.00 m²"
      },
      {
        "metric": "Effective paver footprint (with joint gap)",
        "value": "0.08 m²"
      },
      {
        "metric": "Pavers needed (no wastage)",
        "value": "290 pavers"
      },
      {
        "metric": "Pavers needed (with wastage)",
        "value": "318 pavers (+10%)"
      },
      {
        "metric": "Extra pavers for waste",
        "value": "28 pavers"
      },
      {
        "metric": "Estimated coverage from purchase",
        "value": "26.40 m²"
      },
      {
        "metric": "Estimated cost",
        "value": "$795.00"
      }
    ],
    "summary": "24.00 m² project · 318 pavers +10%"
  },
  "credits_used": 5,
  "credits_remaining": null
}