$ marketsync --version

MarketSync

Prediction Market Arbitrage Tools

Spot Positive EV Plays Across Prediction Markets.
Find arbitrage opportunities between Kalshi and Polymarket in real-time.

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How It Works

STEP 01

Monitor Markets

Track odds from Kalshi and Polymarket across NFL, NHL, and NBA games. Real-time updates every 15 seconds with auto-refresh capabilities.

STEP 02

Detect Arbitrage

Automated calculation of combined probabilities across platforms. Identify opportunities where combined odds are less than 100%, indicating guaranteed profit.

STEP 03

Calculate & Execute

Use the built-in calculator to determine optimal bet distribution. Direct trading links to execute positions on both platforms instantly.

What is Arbitrage?

Arbitrage in prediction markets occurs when you can bet on all possible outcomes of an event across different platforms and guarantee a profit, regardless of the result.

NFLDemo Arbitrage Card
Updated 2 mins ago

San Francisco 49ers @ Kansas City Chiefs

Kickoff 7:25 PM ET — Jan 12

KalshiVolume $45K
49ers / Chiefs
48.5%/51.2%
PolymarketVolume $38K
49ers / Chiefs
49.0%/50.1%
Profit Margin+2.8%
Combined Probability97.2%

By betting $100 on Away at Kalshi and $100 on Home at Polymarket, you guarantee a payout of ~$105 regardless of the outcome. The key is finding these price discrepancies and executing quickly before markets adjust.

Supported Platforms

Kalshi

PREDICTION MARKET

CFTC-regulated prediction market platform. Trade on sports, politics, and more.

Fee (Maker):1.75%
Tip: Use maker orders to reduce fees by 4x

Polymarket

PREDICTION MARKET

Decentralized prediction market built on Polygon. Global markets with USDC settlement.

Fee:~2.5%
Settlement:USDC
Crypto-native platform with high liquidity
FAQ

Frequently Asked Questions

Get answers to common questions about prediction market arbitrage and our platform.

Arbitrage occurs when you can place opposing bets on the same event across different platforms at prices that guarantee a profit. When the combined probabilities of all outcomes are less than 100%, you can bet on each outcome and ensure a positive return regardless of the result.

Prediction markets operate differently from traditional sportsbooks. They use probability-based pricing where contracts trade between $0 and $1, representing the implied probability of an outcome. This creates unique arbitrage opportunities as odds can diverge significantly between platforms like Kalshi and Polymarket, especially during high-volatility periods.

Typical arbitrage opportunities range from 1-5% profit margins after accounting for platform fees. Higher margins are possible during volatile market conditions or when markets first open. Keep in mind that opportunities are time-sensitive and can disappear quickly as markets adjust, so fast execution is crucial.

Yes, arbitrage trading is legal and permitted on both Kalshi and Polymarket. These platforms allow users to take any position they choose, including hedging strategies across different markets. As long as you comply with each platform's terms of service and account requirements, arbitrage trading is a legitimate strategy.

Still have questions? We're here to help.