curl --request POST \
  --url https://api.iotools.cloud/v1/tool/scale-model-conversion-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "mode": "toModel",
  "value": "40",
  "valueUnit": "in",
  "scale": "24",
  "outputUnit": "in"
}
'

{
  "tool": "scale-model-conversion-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "result": [
      {
        "metric": "Model size",
        "value": "1.667 in"
      },
      {
        "metric": "Real-world size",
        "value": "40 in"
      },
      {
        "metric": "Scale",
        "value": "1 : 24"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}