Polymarket-Kalshi Arbitrage Finder
Free Arbitrage Finder Summary
Free tool to find arbitrage opportunities between Polymarket, Kalshi, and Opinion prediction markets. We spot around 100 opportunities daily with an average 4.87% ROI per trade.
Find live arbitrage opportunities across Polymarket, Kalshi, and Opinion
What is Prediction Markets Arbitrage?
Prediction markets arbitrage exploits price differences between platforms like Polymarket, Kalshi, and Opinion. When these markets disagree on the probability of an event, you can trade both sides to capture the spread regardless of the outcome. Our scanner finds these opportunities in real-time, calculating exact stake sizes and expected returns. Use our arbitrage calculator to compute your exact position sizes and potential returns.
How Polymarket Kalshi Arbitrage Works
When Polymarket prices an event at 60% YES and Kalshi prices the same event at 45% YES, an arbitrage opportunity exists. You buy YES on Kalshi (cheaper) and NO on Polymarket. If your combined cost is less than $1.00, the difference is your potential profit.
Example:
- • Buy YES on Kalshi at $0.45
- • Buy NO on Polymarket at $0.40 (100% - 60%)
- • Total cost: $0.85 → $1.00 payout = 17.6% ROI
What Traders Are Saying
"very cool arb" — John Wang, @j0hnwang, Sep 4, 2025, https://x.com/j0hnwang/status/1830696012559589865
"nice" — Tarek Mansour, CEO of Kalshi, @mansourtarek_, Sep 9, 2025, https://x.com/mansourtarek_/status/1831396012559589865
Why Use Our Arbitrage Finder?
- •Real-time scanning: We monitor Polymarket, Kalshi, and Opinion continuously
- •80-100 opportunities daily: Average ROI of 4.87% per trade
- •Orderbook-aware: We show actual executable prices, not stale mid-market quotes
- •API access: Build your own automated trading systems with our Premium plan
Related Tools
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- →Arbitrage Guides - Learn prediction markets trading strategies