curl --request POST \
  --url https://api.iotools.cloud/v1/tool/zero-coupon-bond-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "calcType": "price",
  "faceValue": "1000",
  "rate": "5",
  "years": "10",
  "compound": "1",
  "currency": "USD"
}
'

{
  "tool": "zero-coupon-bond-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "summary": [
      {
        "metric": "Solved For",
        "value": "Bond Price"
      },
      {
        "metric": "Face Value",
        "value": "$1,000.00"
      },
      {
        "metric": "Bond Price",
        "value": "$613.91"
      },
      {
        "metric": "Yield to Maturity",
        "value": "+5.000%"
      },
      {
        "metric": "Compounding Frequency",
        "value": "Annually"
      },
      {
        "metric": "Years to Maturity",
        "value": "10"
      },
      {
        "metric": "Discount",
        "value": "$386.09"
      },
      {
        "metric": "Discount %",
        "value": "+38.61%"
      },
      {
        "metric": "Total Return Over Term",
        "value": "+62.89%"
      },
      {
        "metric": "Effective Annual Yield",
        "value": "+5.000%"
      },
      {
        "metric": "Duration (Years)",
        "value": "10.00"
      },
      {
        "metric": "Investment Quality",
        "value": "Moderate Yield"
      }
    ],
    "schedule": [
      {
        "year": "0",
        "accreted-value": "$613.91"
      },
      {
        "year": "1",
        "accreted-value": "$644.61"
      },
      {
        "year": "2",
        "accreted-value": "$676.84"
      },
      {
        "year": "3",
        "accreted-value": "$710.68"
      },
      {
        "year": "4",
        "accreted-value": "$746.22"
      },
      {
        "year": "5",
        "accreted-value": "$783.53"
      },
      {
        "year": "6",
        "accreted-value": "$822.70"
      },
      {
        "year": "7",
        "accreted-value": "$863.84"
      },
      {
        "year": "8",
        "accreted-value": "$907.03"
      },
      {
        "year": "9",
        "accreted-value": "$952.38"
      },
      {
        "year": "10",
        "accreted-value": "$1,000.00"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}