curl --request POST \
  --url https://api.iotools.cloud/v1/tool/volume-surface-area-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "shape": "cube",
  "unit": "cm",
  "side": "4"
}
'

{
  "tool": "volume-surface-area-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "results": [
      {
        "property": "Volume",
        "value": "64 cm³"
      },
      {
        "property": "Surface area",
        "value": "96 cm²"
      },
      {
        "property": "Space diagonal",
        "value": "6.93 cm"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}