Prediction Market Arbitrage Guide [2026]

What Is Prediction Market Arbitrage?

Arbitrage means buying low on one platform and selling high on another — locking in a guaranteed profit regardless of the outcome. Because prediction markets operate on separate exchanges with different user bases, the same event often trades at different prices.

Example:

• Kalshi: “Will the Fed cut rates in June?” — YES at $0.62
• Polymarket: Same event — YES at $0.58

You could buy YES on Polymarket at $0.58 and sell YES on Kalshi at $0.62, locking in $0.04 profit per contract regardless of the outcome.

How Arbitrage Works

Step 1: Find Price Discrepancies

Monitor the same event across multiple platforms. Look for price gaps larger than your transaction costs.

Step 2: Execute Both Sides

Buy the cheaper contract on Platform A and sell (or buy the opposite) on Platform B. Both trades should happen as close to simultaneously as possible.

Step 3: Wait for Resolution

When the event resolves, one contract pays $1 and the other pays $0. Your net profit is the price difference minus fees.

Types of Arbitrage

Cross-Platform Arbitrage

The most common type — same event, different prices on different platforms.

Platform A	Platform B	Your Action	Profit
YES @ $0.55	YES @ $0.60	Buy A, Sell B	$0.05/contract
NO @ $0.35	YES @ $0.58	Buy NO on A ($0.35) + Buy YES on B ($0.58) = $0.93 total, pays $1	$0.07/contract

Time Arbitrage

Prices move at different speeds on different platforms. When news breaks, one platform may update faster than another, creating temporary price gaps.

Market-Making

Advanced strategy: place limit orders on both sides of a market, earning the spread. This requires more capital and sophistication.

Finding Opportunities

Manual Monitoring

Keep both Kalshi and Polymarket open side by side. Focus on:

• Major events (elections, Fed decisions, sports finals)
• Markets with high volume on both platforms
• Times of high news flow (when prices move quickly)

Key Pairings to Watch

• Kalshi vs Polymarket — Largest overlap of markets
• DraftKings vs Kalshi — Sports events specifically
• Polymarket vs Crypto.com OG — Crypto-related events

Realistic Returns

Let’s be honest about expectations:

• Typical spread: $0.01-0.05 per contract
• After fees: $0.005-0.04 net profit per contract
• Capital required: Need positions on multiple platforms simultaneously
• Frequency: 2-5 actionable opportunities per week on major markets
• Monthly return: 1-5% on deployed capital (realistic, not guaranteed)

Arbitrage is low-risk, low-return compared to directional trading. It’s a volume game — small profits on many trades.

Risks and Challenges

Execution Risk

Prices move fast. By the time you execute on Platform B, the price on Platform A may have changed. This is called “slippage.”

Settlement Risk

Different platforms may resolve the same event differently due to different oracle systems or resolution criteria. Always check resolution rules on both platforms.

Capital Lock-up

Your money is locked until the event resolves. If the event is months away, your capital is tied up earning a small return.

Regulatory Risk

Using Polymarket from the US (via VPN) for arbitrage adds legal risk on top of trading risk. Kalshi + DraftKings arbitrage avoids this issue.

Fee Drag

Transaction fees, deposit/withdrawal fees, and spread costs eat into thin margins. Only pursue arbitrage if the net profit (after all fees) is positive.

Getting Started

1. Fund accounts on 2+ platforms — Start with Kalshi and one other
2. Identify overlapping markets — Find the same event on both platforms
3. Compare prices carefully — Account for fees and spreads
4. Start small — Test with small positions to understand execution
5. Track everything — Log every trade, fee, and outcome in a spreadsheet

Is Arbitrage Worth It?

For most people: no. The time investment and capital requirements make directional trading (betting on what you think will happen) more profitable per hour spent.

For quantitative traders: potentially yes. If you can automate price monitoring and execution, arbitrage becomes a systematic strategy that compounds over time.

For beginners, we recommend starting with straightforward trading on a single platform. See our beginner’s guide first.