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finmath Bond Duration Calculator
x402
finmath Bond Duration Calculator is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Computes the Macaulay or modified duration of a bond given its face value, coupon rate, yield, frequency, and maturity.
Price / call$0.002
Success—
StatusUnknown
How this service works
Deterministic finance and crypto math for AI agents: TradFi (NPV, IRR, XIRR, Black-Scholes + Greeks, bonds, VaR, Sharpe) and DeFi (impermanent loss, perp liquidation, funding, Uniswap v3, health factor, cost basis). Exact, model-free arithmetic that LLMs get wrong — priced per call in USDC.
Output
Returns a result object containing the computed bond duration value (Macaulay or modified duration in years) and a meta object with calculation details. The duration quantifies the weighted average time to receive the bond's cash flows, useful for measuring interest rate sensitivity.
Example use cases
Example prompt
“What's the duration of a $1000 face value bond with a 5% coupon rate, 4% annual yield, paying semi-annually, with 10 years to maturity?”
Technical details
Endpoint
POSThttps://finmath.qzqh5rrbkz.workers.dev/v1/bond_durationWhen to prefer
Use this endpoint when you need exact, deterministic bond duration calculations that LLMs cannot reliably perform via mental arithmetic. Prefer this over general-purpose LLM math when working with fixed income instruments requiring precise Macaulay or modified duration for interest rate risk assessment, portfolio immunization, or duration-matched hedging strategies.
Side effects
- Missing required fields (face, coupon_rate, annual_yield) returns a 4xx validation error
- Non-numeric or negative values for financial inputs may cause errors or nonsensical results
- Zero or near-zero yield may produce division errors depending on implementation
- Insufficient USDC balance or payment failure results in 402 Payment Required
- Invalid frequency values (e.g. non-standard periods) may not be handled gracefully
Input
{
"face": 1000,
"freq": 2,
"years": 10,
"coupon_rate": 0.05,
"annual_yield": 0.04
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| facerequired | number | face |
| freq | number | freq |
| years | number | years |
| coupon_raterequired | number | coupon_rate |
| annual_yieldrequired | number | annual_yield |
Output
{
"meta": {
"tool": "bond_duration",
"disclaimer": "Deterministic calculation utility. Not financial, investment, or trading advice.",
"deterministic": true
},
"result": {
"price": 1081.7571667229854,
"modified": 7.922486267785758,
"macaulay_years": 8.080935993141473
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| metarequired | object | |
| resultrequired | — |
Tags
x402
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