curl --request POST \
  --url https://api.iotools.cloud/v1/tool/bond-duration-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "faceValue": "1000",
  "couponRate": "5",
  "yieldToMaturity": "6",
  "years": "5",
  "frequency": "2",
  "yieldShockBps": "100",
  "currency": "USD"
}
'

{
  "tool": "bond-duration-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "summary": [
      {
        "metric": "Face Value",
        "value": "$1,000.00"
      },
      {
        "metric": "Annual Coupon Rate",
        "value": "5.00%"
      },
      {
        "metric": "Yield to Maturity",
        "value": "6.00%"
      },
      {
        "metric": "Years to Maturity",
        "value": "5"
      },
      {
        "metric": "Payment Frequency",
        "value": "Semi-Annually"
      },
      {
        "metric": "Bond Price",
        "value": "$957.35"
      },
      {
        "metric": "Macaulay Duration",
        "value": "4.4717 years"
      },
      {
        "metric": "Modified Duration",
        "value": "4.3414 years"
      },
      {
        "metric": "DV01 (Price per 1bp)",
        "value": "$0.42"
      },
      {
        "metric": "Yield Shock",
        "value": "+100 bps (+1.00%)"
      },
      {
        "metric": "Shocked Yield to Maturity",
        "value": "7.00%"
      },
      {
        "metric": "Duration-Estimated Price Change",
        "value": "-4.3414%"
      },
      {
        "metric": "Duration-Estimated Price",
        "value": "$915.79"
      },
      {
        "metric": "Exact Repriced Value",
        "value": "$916.83"
      },
      {
        "metric": "Exact Price Change",
        "value": "-4.2320%"
      },
      {
        "metric": "Duration Estimation Error",
        "value": "+0.1094%"
      }
    ],
    "schedule": [
      {
        "period": "1",
        "time-years": "0.5",
        "cash-flow": "$25.00",
        "present-value": "$24.27",
        "weight-of-price": "2.535%"
      },
      {
        "period": "2",
        "time-years": "1.0",
        "cash-flow": "$25.00",
        "present-value": "$23.56",
        "weight-of-price": "2.461%"
      },
      {
        "period": "3",
        "time-years": "1.5",
        "cash-flow": "$25.00",
        "present-value": "$22.88",
        "weight-of-price": "2.390%"
      },
      {
        "period": "4",
        "time-years": "2.0",
        "cash-flow": "$25.00",
        "present-value": "$22.21",
        "weight-of-price": "2.320%"
      },
      {
        "period": "5",
        "time-years": "2.5",
        "cash-flow": "$25.00",
        "present-value": "$21.57",
        "weight-of-price": "2.253%"
      },
      {
        "period": "6",
        "time-years": "3.0",
        "cash-flow": "$25.00",
        "present-value": "$20.94",
        "weight-of-price": "2.187%"
      },
      {
        "period": "7",
        "time-years": "3.5",
        "cash-flow": "$25.00",
        "present-value": "$20.33",
        "weight-of-price": "2.123%"
      },
      {
        "period": "8",
        "time-years": "4.0",
        "cash-flow": "$25.00",
        "present-value": "$19.74",
        "weight-of-price": "2.061%"
      },
      {
        "period": "9",
        "time-years": "4.5",
        "cash-flow": "$25.00",
        "present-value": "$19.16",
        "weight-of-price": "2.001%"
      },
      {
        "period": "10",
        "time-years": "5.0",
        "cash-flow": "$1,025.00",
        "present-value": "$762.70",
        "weight-of-price": "79.668%"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}