options-payoff

This skill generates an interactive options payoff curve chart with dynamic parameter controls, helping users visualize how an options trade makes or loses money. It solves the problem of understanding the risk and reward profile of multi-leg options structures by turning a strategy description, a pasted set of strikes and premiums, or a broker screenshot into a live HTML widget that plots both the expiry payoff and the theoretical Black-Scholes value, with real-time stats for max profit, max loss, breakevens, and current P&L at spot.

The workflow extracts the strategy parameters (strategy type, underlying, strikes, premium, quantity, multiplier, expiry, spot, implied volatility, risk-free rate) with documented defaults, identifies the structure among supported types (butterfly, vertical and calendar spreads, iron condor, straddle, strangle, covered call, naked put, ratio spread, or a decomposed custom mode), and computes payoffs using provided Black-Scholes formulas and per-strategy expiry payoff functions. It then renders a widget with sliders for structure and pricing variables and a full-width spot slider, plotting a theoretical-value curve and a dashed expiry curve with strike and spot markers. Reference files cover detailed per-strategy payoff edge cases and a copy-paste Black-Scholes JavaScript implementation. It can optionally fetch a current index reference price via a read-only market-data lookup.

It targets options traders, finance learners, and anyone analyzing an options position who wants an intuitive P&L visualization from partial information. Because the skill only computes and charts hypothetical payoffs and, at most, reads a public price quote, its behavior is analytical and read-only, not executing any trades or handling brokerage credentials.