The ZCB model uses a compound interest formula to determine the PT price:
P(t)=(1+initialAPY)tF
where initialAPY is the APY fixed at inception, t represents years to maturity, and F is the face value. This model captures the exponential accumulation of yield over time and is widely adopted in traditional finance. It offers a more precise representation of time value compared to linear discounting, making it particularly appropriate for longer-term PTs or contexts requiring alignment with standard bond valuation practices.