curl --request POST \
  --url https://api.iotools.cloud/v1/tool/plant-spacing-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "length": "240",
  "width": "120",
  "spacing": "15",
  "unit": "cm"
}
'

{
  "tool": "plant-spacing-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "resultTable": [
      {
        "metric": "Bed area",
        "value": "28,800 cm²"
      },
      {
        "metric": "Square grid pattern",
        "value": "17 × 9 = 153 plants"
      },
      {
        "metric": "Triangular (staggered) pattern",
        "value": "165 plants across 10 rows"
      },
      {
        "metric": "Difference",
        "value": "+12 plants (+7.8%) with triangular spacing"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}