Inspiration

Options traders have had multi-leg strategy builders for decades. Prediction market traders? Nothing. You can't build a bull spread on Polymarket. You can't see a combined payoff curve. You can't analyze portfolio Greeks. We saw a billion-dollar market trading like it's 1990.

What it does

It's the first multi-leg strategy builder for prediction markets. You can combine multiple Polymarket positions into sophisticated strategies—bull spreads, bear spreads, straddles, iron condors—and instantly see your combined payoff curve. Click a template, positions load. Click analyze, see your max profit, max loss, breakevens, and portfolio Greeks. It's OptionsProfit Calculator meets Bloomberg Terminal, built for Polymarket.

How we built it

Next.js 14 for the frontend, TypeScript for portfolio calculations and Greeks engine, Chart.js for interactive payoff visualization, and Polymarket's Gamma API for live market data. We adapted traditional Black-Scholes derivatives math for binary prediction markets—Delta, Gamma, Theta, Vega all work perfectly for 0/1 outcomes.

Challenges we ran into

The biggest challenge was multi-market payoff visualization. With 3 positions across 3 different markets, you have 3-dimensional probability space. You can't show that in a 2D chart. Our solution: let users select which market to vary, hold the others constant at current prices, and clearly explain what we're showing. Honest math beats fake sophistication.

Accomplishments that we're proud of

We built something that genuinely doesn't exist. No other platform lets you combine Polymarket positions and see aggregate analytics. We're proud of the strategy templates—one click loads proven patterns and teaches traders how spreads work. We're proud that the payoff calculation is mathematically sound. And we're proud that it feels professional—this looks like a tool Wall Street would use.

What we learned

Prediction markets ARE binary options. The entire derivatives playbook applies. Bull spreads reduce capital requirements. Straddles profit from volatility. Iron condors collect premium. The math is the same, the strategies are the same, the Greeks are the same. The gap wasn't mathematical—it was just that nobody had built the tools yet.

What's next for Multi-Leg Strategy Builder

Time-based payoff surfaces showing P/L evolution as resolution approaches. Automated correlation detection to flag redundant exposure. Strategy backtesting against historical market data. Optimal exit recommendations based on Greeks. Mobile app for on-the-go portfolio management. And eventually, automated market maker integration for one-click strategy execution.