Kalshi vs Polymarket Comparison: Which Prediction Market Platform Is Best for You?

§ 01 Executive Snapshot

• What: Comparison of Kalshi and Polymarket, the two leading prediction market platforms in the U.S.
• Who: Kalshi and Polymarket, both CFTC-regulated platforms.
• Why it matters: Understanding the strengths and weaknesses of each platform helps traders make informed decisions on where to engage in prediction markets.

§ 02 Key Developments

• Polymarket controls over 85% of U.S.-accessible prediction market volume and charges the lowest effective fees.
• Kalshi processed approximately $14.8 billion in volume in April 2026, marking its highest month on record.
• Polymarket launched its U.S. platform in December 2025 and opened to general signups in May 2026, available in 48 states plus D.C.

§ 03 Strategic Context

• Both platforms are regulated by the CFTC, allowing them to operate across state lines, distinguishing them from state-licensed sportsbooks.
• The legal landscape is evolving, with multiple states contesting the CFTC's authority, which could impact operational capabilities.

§ 04 Strategic Implications

• Polymarket's lower fees and liquidity on major political and macro contracts position it as a preferred platform for active traders.
• Kalshi's extensive market catalog and funding options make it attractive for traders looking for diverse betting opportunities.

§ 05 Risks & Constraints

• Regulatory changes could impact both platforms' operations and market access for users in certain states.
• Kalshi's higher fees and limited availability in specific states may deter some traders.

§ 06 Watchlist / Forward Signals

• Monitor the legal challenges to the CFTC's authority over prediction markets as they may affect platform operations.
• Watch for updates on liquidity and market offerings from both platforms as they expand and adapt to user needs.