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How Prediction-Market Traders Find Pricing Splits Without Predicting the Winner
Nine short lessons on how cross-platform pricing gaps form, how the math works, and where the real risks live.
Prediction Markets Explained
Prediction markets are exchanges where people trade contracts that pay $1 if a real-world event happens and $0 if it does not. The price acts as a live probability estimate shaped by thousands of participants.
Why Pricing Differences Happen
Each platform is a separate marketplace with its own liquidity, traders, access rules and position limits. Capital can't instantly move between them, so the same event can be priced differently on each.
Basic Arbitrage Mathematics
Buy YES on one platform and NO on the other. If the combined cost is below $1.00, one side must pay $1.00 — the difference is the gross spread, before fees, slippage and settlement risk.
Real Example
Kalshi YES at $0.56 + Polymarket NO at $0.39 = $0.95 combined. Gross split: 5.26%. After modeled fees: roughly 4.1% net. Size is capped by whichever book is thinner.
Liquidity
Quoted prices only apply to small sizes. Thin books mean you walk up the order book, paying worse prices. Maximum deployable capital is bounded by the thinner leg.
Fees
Trading fees, withdrawal fees and crypto rails all subtract from the spread. A 2% gross opportunity on platforms charging 1% blended fees nets roughly 1%.
Contract Matching
The two legs must resolve the same event the same way. Wording, resolution criteria, sources and cancellation policies differ across platforms — and mismatches are the biggest risk in this strategy.
Execution Risk
You execute two legs sequentially. The first fills and the second's price moves, and your "arbitrage" becomes a directional position. Speed, limits and slippage all matter.
How MarketSplits Works
MarketSplits scans supported markets, matches equivalent contracts, and shows the full economics: combined cost, fees, net spread, liquidity caps, settlement dates and a 0–100 confidence score. You decide what to do using your own accounts.
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