Kalshi vs Polymarket: Which Prediction Market Wins in 2026?
The choice between Kalshi and Polymarket comes down to three things: regulation, liquidity, and the specific markets you want to trade. Kalshi is the only CFTC-regulated US prediction exchange — fully legal in all 50 states, IRS-reportable, but with thinner liquidity outside macro and election markets. Polymarket has the deepest liquidity in crypto, sports, and international events, but operates offshore (not legally accessible to US users without VPN). Most serious traders use both via PredictEngine, which routes orders to whichever venue has the better price.
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Frequently Asked Questions
Is Kalshi or Polymarket more legal in the US?
Kalshi is fully legal in all 50 US states (CFTC Designated Contract Market). Polymarket is technically not available to US residents per its Terms of Service since the 2022 CFTC settlement.
Which has lower fees, Kalshi or Polymarket?
Polymarket charges 0% trading fees but ~2% on withdrawals. Kalshi charges a per-contract trading fee that varies by market type (typically $0.01-$0.07 per contract). For high-frequency strategies Polymarket usually wins on fees.
Can I trade the same election market on both?
Often yes — both venues list major US election markets. Prices diverge frequently, creating arbitrage windows. PredictEngine's cross-venue scanner catches these automatically.
Which is better for sports betting, Kalshi or Polymarket?
Polymarket has deeper sports liquidity (NFL, NBA, soccer, UFC, tennis). Kalshi added sports markets in 2024 but liquidity is still concentrated in headline events. For arbitrage versus DraftKings/FanDuel, both are useful.
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