Kalshi vs Polymarket in 2026: the split is the passport, not the UI.

People keep asking which prediction market is “better.” In 2026 that question is mostly illegal in one direction and inconvenient in the other.

If you are in the United States, Kalshi is the legal default. Polymarket is blocked. Kalshi takes ACH, pays roughly 4% on idle cash, and sits under the same DCM category as CME.

If you are outside the US and already hold USDC, Polymarket is often faster: no KYC, crypto in, crypto out. Kalshi still wins if you want a bank transfer instead of a stablecoin hop.

Fees are different shapes, not just different numbers. Kalshi’s formula peaks at 50¢ and caps at $1.75 per 100 contracts. Polymarket takes a percent of notional. Run both calculators on a real clip before you pick a home.

You do not need both unless you actually trade both geographies. One clean account beats two half-funded ones.