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Cross-Platform Prediction Market Arbitrage: A Beginner's Guide

Mar 30, 2026, 06:31 AM
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Arbitrage exploits price differences across platforms. Learn how to find and profit from these discrepancies in prediction markets like Kalshi and Polymarket.

Prediction Market Arbitrage: Easy Money? (Maybe!)

Arbitrage is profiting from price differences. Think buying low on Kalshi, selling high on Polymarket. Sounds simple, right? It can be, but there's a catch. Let's dive in.

Finding the Discrepancies

Tools like Oddspool.com help spot these price differences. Imagine "Will a human land on Mars before California starts high-speed rail?" is 40% on Kalshi (NO) and 60% on Polymarket (YES). This could be an arbitrage opportunity! Check https://predmarkets.online/#/markets for live prices.

Calculating Real Profit (Fees Matter!)

Don't forget fees! Each platform charges them. Let's say Kalshi charges 1%, Polymarket 2%. You need to factor these into your potential profit. A 2% difference might vanish after fees. Ouch!

Execution Risks: Slippage and Speed

Prices change fast. By the time you execute both trades, the opportunity might be gone. This is slippage. Plus, some platforms are slower than others. Also, consider market depth. Can you actually buy/sell the amount you want at the displayed price?

Example: Elon on Mars?

Let's say "Will Elon Musk visit Mars in his lifetime?" is 45% on Kalshi (YES) and 55% on Polymarket (NO). After fees, and considering execution speed, is the profit worth the risk? Maybe! Always do your math.

Conclusion: Proceed with Caution (and a Calculator)

Arbitrage can be profitable, but it's not a free lunch. Use tools, understand fees, and be aware of execution risks. Happy trading!

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