The Complete Polymarket Arbitrage Guide 2026
Discover how to find and profit from arbitrage opportunities between Polymarket and traditional sportsbooks. Real strategies used by top traders.
Arbitrage trading on Polymarket has become one of the most profitable strategies in prediction markets. In this comprehensive guide, we'll break down exactly how it works and how you can start finding opportunities today.
What is Polymarket Arbitrage?
Arbitrage is the practice of profiting from price differences between markets. On Polymarket, there are two main types of arbitrage:
Automate Arbitrage Trading
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Start Arbitrage BotInternal Arbitrage
When YES + NO prices on Polymarket don't add up to $1.00, you can profit by buying both sides.
Cross-Platform Arbitrage
When Polymarket prices differ from sportsbook odds, you can value bet the underpriced side.
Internal Arbitrage: The Basics
In a binary market, YES + NO should equal $1.00. When they don't, there's an arbitrage opportunity. For example:
Important: Polymarket Fees
Polymarket charges a 2% fee on winnings. You need at least 2.5-3% edge to be profitable after fees.
Cross-Platform Arbitrage: The Real Edge
The biggest opportunities come from comparing Polymarket prices to traditional sportsbooks. Here's the key insight:
The Sportsbook Advantage
Sportsbooks like DraftKings and FanDuel employ professional oddsmakers. Their prices represent the "true" probability. Polymarket often lags behind.
This means: If DraftKings says Lakers have 70% chance to win, but Polymarket has them at 65¢, that's a 5% edge.
The Swisstony Strategy
The most successful sports trader on Polymarket, "swisstony", has made over $3.7 million in profit using this exact strategy. Here's how it works:
Monitor Sportsbook Odds
Track odds movements on DraftKings, FanDuel, and other major books.
Compare to Polymarket
Calculate the implied probability from sportsbook odds and compare to Polymarket prices.
Buy Underpriced Positions
When Polymarket price is 3%+ below sportsbook implied probability, buy that side.
Wait for Convergence or Resolution
Either Polymarket catches up (sell for profit) or the event resolves (collect winnings if correct).
Real Example: NFL Game
Chiefs vs Ravens - January 2026
Action: Buy Chiefs YES on Polymarket at 58¢. If Chiefs win, receive $1. Expected value: 64.3% × $1 = 64.3¢ (vs 58¢ cost).
How to Find Opportunities
Manually checking every market is time-consuming. Here are the best ways to find arbitrage opportunities:
PredictEngine Scanner
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Focus on High-Volume Sports
NFL, NBA, and major soccer leagues have the most liquidity and opportunities. Avoid low-volume markets where slippage eats profits.
Key Metrics to Track
| Metric | Target |
|---|---|
| Minimum Edge | 3%+ |
| After Fees | 1%+ profit |
| Market Liquidity | $10K+ depth |
| Time to Event | <24 hours |
Risks and Considerations
Slippage
Large orders can move the market. Always check orderbook depth before trading.
Odds Movement
Sportsbook odds can shift quickly. The edge might disappear before you execute.
Event Risk
Games can be postponed, cancelled, or have rule changes that affect outcomes.
Start Finding Arbitrage Today
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