curl --request POST \
  --url https://api.iotools.cloud/v1/tool/roi-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "initialInvestment": "10000",
  "finalValue": "15000",
  "additionalCosts": "0",
  "incomeReceived": "0",
  "years": ""
}
'

{
  "tool": "roi-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "results": [
      {
        "metric": "Total Invested",
        "value": "$10,000.00"
      },
      {
        "metric": "Total Return",
        "value": "$15,000.00"
      },
      {
        "metric": "Net Profit",
        "value": "$5,000.00"
      },
      {
        "metric": "ROI",
        "value": "50.00%"
      },
      {
        "metric": "Investment Multiple",
        "value": "1.50×"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}