We scan 43,000+ Polymarket markets and match them against 4,500+ Kalshi events to find price gaps you can profit from. Live prices, real-time ROI calculations, and resolution dates - unlike sports-only tools, we cover every market.
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Arbitrage is the practice of profiting from price differences across markets. When two platforms price the same event differently, you can lock in a return with zero directional risk.
Polymarket says “Event X” has YES at 60c. Kalshi says the same event has NO at 35c. Combined cost: 95c.
Buy YES on Polymarket (60c) and NO on Kalshi (35c). Total investment: 95c. One side always wins.
No matter the outcome, one contract pays $1. You paid 95c, you receive $1. That is a 5.3% ROI with zero directional risk.
Sorted by ROI - the best opportunities appear first. Positive ROI means guaranteed profit when you buy both sides.
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Our engine does the heavy lifting - you just act on the opportunities.
Our engine monitors every active prediction market on Polymarket - crypto, politics, sports, world events, and more. No market is too small or niche.
Our fuzzy matching AI compares each market against 4,500+ Kalshi events. Only high-confidence matches with verified data are shown.
We pull live prices from both platforms and calculate ROI after fees. Positive net ROI means guaranteed profit. Best opportunities first.
OddsJam and other arb tools only cover sportsbooks. We cover every prediction market - where the biggest inefficiencies live.
| Feature | Whale Predictions | OddsJam / Others |
|---|---|---|
| Politics & Elections | ✓ | ✗ |
| Crypto Markets | ✓ | ✗ |
| World Events | ✓ | ✗ |
| Economics & Finance | ✓ | ✗ |
| Sports Betting | ✓ | ✓ |
| Free Tier | ✓ Free forever | 7-day trial then $199/mo |
| Fee-Adjusted ROI | ✓ Net after 9% fees | ✗ |
Prices change in real time. The spread you see may narrow or disappear by the time you execute both legs of the trade. Speed matters — act quickly on opportunities.
Polymarket and Kalshi may resolve the same event differently due to different contract wording or resolution criteria. Always verify both contracts match before trading.
Combined platform fees (approximately 2% Polymarket + 7% Kalshi) significantly reduce gross spreads. We show net ROI after fees so you see realistic returns.
Our AI matching has high confidence but is not perfect. Always verify that the Polymarket and Kalshi contracts refer to the exact same outcome before placing trades.
This tool provides informational data only. It is not financial advice. Always do your own research and trade at your own risk.
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