Price a digital (binary) put option that pays a fixed amount (typically $1) if the spot price is below the strike at expiration, otherwise pays nothing. Also known as a cash-or-nothing put.
Payoff: 1 if S_T < K, else 0
Use Cases:
Tier: Standard (2 credits/request)
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Current price of the underlying asset
100
Strike price of the digital option
105
Risk-free interest rate (annualized, decimal format)
0.05
Annualized volatility (decimal format)
0.25
Time to expiration in years
1
Continuous dividend yield (annualized, decimal format)
0.02