curl --request POST \
  --url https://api.iotools.cloud/v1/tool/rental-property-roi-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "purchasePrice": "200000",
  "downPayment": "25",
  "downPaymentType": "percent",
  "annualRate": "6",
  "loanTermYears": "30",
  "closingCosts": "4000",
  "monthlyRent": "2000",
  "vacancyRate": "5",
  "propertyTaxAnnual": "2200",
  "insuranceAnnual": "900",
  "hoaAnnual": "0",
  "managementRate": "8",
  "maintenanceRate": "5"
}
'

{
  "tool": "rental-property-roi-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "results": [
      {
        "metric": "Loan Amount",
        "value": "$150,000"
      },
      {
        "metric": "Down Payment",
        "value": "$50,000"
      },
      {
        "metric": "Monthly Mortgage Payment (P&I)",
        "value": "$899"
      },
      {
        "metric": "Effective Gross Income (annual)",
        "value": "$22,800"
      },
      {
        "metric": "Operating Expenses (annual)",
        "value": "$6,064"
      },
      {
        "metric": "Net Operating Income — NOI (annual)",
        "value": "$16,736"
      },
      {
        "metric": "Cap Rate",
        "value": "8.37%"
      },
      {
        "metric": "Monthly Cash Flow",
        "value": "$495"
      },
      {
        "metric": "Annual Cash Flow",
        "value": "$5,944"
      },
      {
        "metric": "Cash-on-Cash Return",
        "value": "11.01%"
      },
      {
        "metric": "Gross Rent Multiplier",
        "value": "8.33"
      },
      {
        "metric": "Total Cash Invested",
        "value": "$54,000"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}