curl --request POST \
  --url https://api.iotools.cloud/v1/tool/asphalt-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "shape": "rectangle",
  "unitSystem": "imperial",
  "length": "30",
  "width": "12",
  "diameter": "",
  "thickness": "3",
  "densityPreset": "hma",
  "customDensity": "",
  "wastePct": "5",
  "pricePerTon": "120",
  "truckCapacity": "10"
}
'

{
  "tool": "asphalt-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "results": [
      {
        "metric": "Shape",
        "value": "Rectangle"
      },
      {
        "metric": "Area",
        "value": "360.0 sq ft (33.4 m²)"
      },
      {
        "metric": "Thickness",
        "value": "3.00 in (7.6 cm)"
      },
      {
        "metric": "Volume",
        "value": "3.33 yd³ (2.55 m³)"
      },
      {
        "metric": "Density",
        "value": "145 lb/ft³ (2323 kg/m³) — Hot mix asphalt, dense-graded"
      },
      {
        "metric": "Tonnage (no waste)",
        "value": "6.53 tons (5.92 tonnes)"
      },
      {
        "metric": "Waste buffer (+5%)",
        "value": "0.33 tons (0.30 tonnes)"
      },
      {
        "metric": "Total tonnage to order",
        "value": "6.85 tons (6.22 tonnes)"
      },
      {
        "metric": "Truckloads",
        "value": "1 trip(s) (~0.69 loads at 10.00 tons ≈ 9.07 tonnes per load)"
      },
      {
        "metric": "Material cost (no waste)",
        "value": "$783.00"
      },
      {
        "metric": "Waste buffer cost",
        "value": "$39.15"
      },
      {
        "metric": "Total cost to order",
        "value": "$822.15"
      }
    ],
    "summary": "360.0 sq ft (33.4 m²) at 3.0 in (7.6 cm) · 6.85 tons (6.22 tonnes) to order · 1 truckload(s) · $822.15 total"
  },
  "credits_used": 5,
  "credits_remaining": null
}