Two platforms.
One market.
PredictRoyale surfaces prediction markets that exist on both Kalshi and Polymarket, then shows you where the two platforms disagree — updated hourly.
Browse Markets →By the numbers
What PredictRoyale does
Cross-platform matching
Our matching engine scans Kalshi and Polymarket for events covering the same question. Events are paired by title similarity, outcome labels, category tags, and close time — then ranked by confidence.
Divergence tracking
For every matched pair we compute the probability gap across all outcomes — not just the top one. A wide gap signals either a genuine information difference or a temporary mispricing worth watching.
Category & tag browsing
Markets are organised into 7 categories — Politics, Sports, Crypto, Finance, Technology, Culture, Climate — each broken down further by tag so you can quickly pivot to the slice of the market you care about.
How to use it
- 1
Pick a category
Use the category bar at the top to jump into a topic — Politics, Sports, Crypto, and more. Tags on the left let you narrow further within a category.
- 2
Check the gap
A gap badge on each card shows how far apart the two platforms are on the top outcome. Wider gaps are more interesting.
- 3
Dig into outcomes
Click any market to see a full side-by-side breakdown of every outcome across both platforms.
- 4
Act on what you find
Follow links directly to Kalshi or Polymarket to place a position. PredictRoyale does not execute trades.
Platforms
A CFTC-regulated exchange for event contracts. Kalshi markets are legally structured as binary contracts settled in USD.
A decentralised prediction market built on Polygon. Polymarket uses USDC and is known for high liquidity on major political and macro events.
Legal & Disclaimers
Non-commercial, no affiliation
PredictRoyale is a personal, non-commercial project. It generates no revenue and has no financial relationship with Kalshi or Polymarket. We are not affiliated with, endorsed by, or sponsored by either platform.
Data sources & trademarks
Market data is fetched from the public APIs of Kalshi and Polymarket and is displayed solely for informational purposes. All data remains the property of its respective platform. Kalshi, Polymarket, and their logos are trademarks of their respective owners. Use of their names and marks here is purely descriptive and does not imply any endorsement.
No financial advice
Nothing on this site constitutes financial, investment, or trading advice. Probability figures shown are sourced directly from each platform's order book and are updated hourly — they may be delayed, inaccurate, or incomplete. Always verify prices on the official platforms before making any trading decision. Prediction markets involve risk — only trade with capital you can afford to lose.
No warranties
This service is provided as-is, with no guarantees of uptime, data accuracy, or fitness for any particular purpose. We reserve the right to modify or discontinue the service at any time.