Prediction markets like Polymarket, Kalshi, and PredictIt let you trade on the probability of real-world events — elections, Fed rate decisions, sports results, and more. Each platform lists thousands of markets. And here's the key insight most traders miss: the same event often trades at different prices on different platforms.
That gap is called a mispricing — and it's an opportunity. When Polymarket says Bitcoin hits $100K with 44% probability and PredictIt says 50%, that's a 6 cent edge you can act on. This is prediction market arbitrage.
In this example, PredictIt prices the event 9 cents higher than Kalshi. A trader who buys YES on Kalshi at 41¢ and sells YES on PredictIt at 50¢ locks in a theoretical profit regardless of outcome — classic arbitrage.
Several factors create persistent mispricings across prediction market platforms:
Each platform has its own set of traders. Polymarket attracts crypto-native users, Kalshi skews toward institutional and regulated traders, PredictIt draws political enthusiasts. Different crowds = different consensus prices.
PredictIt charges 10% on profits + 5% on withdrawals, the highest in the industry. Polymarket currently charges zero trading fees. These differences affect where sophisticated traders concentrate, leaving less efficient pricing on higher-fee platforms.
News travels at different speeds across platforms. A breaking development might be priced in on Polymarket within minutes while Kalshi takes longer to adjust. That window is where the edge lives.
Most traders only check one platform. Manually comparing three platforms for every market is time-consuming and error-prone. That friction keeps prices inefficient longer than they should be. Tools like ArbiTrack eliminate this friction.
ArbiTrack scans Polymarket, Kalshi, and PredictIt every 3 minutes and highlights gaps automatically.
Edges below 5¢ are often absorbed by fees and spread. Focus on 5–20¢ gaps for meaningful opportunities.
A 10¢ edge on a $10K daily volume market is much better than a 10¢ edge on a $500 market. Volume matters.
PredictIt's 10% profit fee and 5% withdrawal fee mean you need a larger edge to profit. Factor this in.
Once a mispricing is spotted by enough traders it corrects. ArbiTrack auto-refreshes so you're always current.
Based on live data from ArbiTrack, the average edge between platforms on any given day is around 4–6 cents. But during high-activity events — major elections, Fed meetings, crypto price milestones — edges of 10–20 cents appear regularly and persist for minutes to hours before closing.
The largest edges tend to appear on:
Prediction market arbitrage is not risk-free in the traditional sense — both positions need to resolve the same way, and you're carrying capital in multiple places simultaneously. But compared to most trading strategies, it has a compelling profile:
As always, this is not financial advice. Prediction markets carry real risk including platform risk, liquidity risk, and resolution disputes. Trade responsibly.
ArbiTrack monitors Polymarket, Kalshi, and PredictIt every 3 minutes.
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