Polymarket vs Kalshi (2026): Fees, Markets, Access Compared

Kalshi and Polymarket are the two platforms that define prediction markets in 2026, and the honest headline is that the old "regulated versus crypto" split no longer decides it. Both now operate under CFTC oversight, and Kalshi has expanded into many of the same countries as Polymarket. The choice is less about geography and more about what you actually value - how you fund, what you trade, and what a trade costs. Here is the breakdown without the marketing.

Regulation and access

Kalshi was built from the ground up as a regulated US exchange, holding a Designated Contract Market licence since 2021. Polymarket took the other road: it began as a decentralized, crypto-native platform on Polygon, grew into the global leader, and only entered the regulated US market in December 2025 after buying a CFTC-licensed exchange. The practical consequence today: Polymarket’s original international platform stays off-limits to US users, who get the separate Polymarket US product, while Kalshi has served US traders legally the whole time. Some state-level restrictions on event contracts are still moving, so availability can vary by where you live. If you don’t yet know how any of this works under the hood, start with what Polymarket is.

Funding: dollars versus crypto

This is the sharpest fork. Kalshi takes ordinary money - bank transfer, wire, debit card, and wallets like PayPal and Venmo - and custodies it for you, exactly like a brokerage. Polymarket’s international platform is on-chain: you fund with USDC on Polygon, hold your own funds in your own wallet, and settle every trade transparently. Neither charges deposit or withdrawal fees on its own side, though your bank, card provider, or an on-ramp may. If self-custody and crypto rails appeal to you, Polymarket fits; if you want money to move the way it does at a bank, Kalshi is simpler.

Markets: mainstream depth versus range

Kalshi leans mainstream, and its centre of gravity is sports - which carry its deepest liquidity - alongside economics, politics and finance. Polymarket offers the widest market selection anywhere: the same big events plus the niche and viral markets nobody else lists, and the short-window crypto Up/Down markets that are this site’s whole focus. For breadth and crypto-native coverage, Polymarket wins; for the deepest mainstream-sports books, Kalshi does.

Fees: where it gets specific

Both use a maker-taker model, and both price shares between 1¢ and 99¢. Kalshi’s taker fee follows a probability-based curve that peaks around 1.75¢ per contract on 50/50 markets and falls toward the extremes. Polymarket generally undercuts it: makers pay nothing and earn a small rebate, and categories like geopolitics trade fee-free. The catch that matters for crypto traders is category-specific - Polymarket’s short-window crypto direction markets can carry a much higher taker fee, so the all-in cost of a 5-minute trade is not the same as a headline market. We break the real numbers down in Polymarket fees, deposits and withdrawals, and why fees quietly move your breakeven is covered in how to read the odds.

Trading crypto direction: two different instruments

Both let you bet on where crypto goes, but not with the same tool. Polymarket runs fixed-window binary Up/Down - will BTC be higher in 5 or 15 minutes, resolving yes or no at a set time. In mid-2026 Kalshi launched crypto perpetual futures: no-expiry contracts that track a token’s price with no fixed settlement. If you want a clean, time-boxed yes/no on direction - and public on-chain history to study - Polymarket’s windows are the native fit, and the probabilities and streaks page exists precisely to read them.

Which one fits you

Choose Kalshi if you are a US resident who wants familiar banking, regulated comfort, and the deepest mainstream sports markets. Choose Polymarket if you want the widest market range, crypto-native funding and self-custody, maker rebates, and short-window crypto Up/Down with readable on-chain data. Many serious traders keep both. Want to see who is actually winning on Polymarket before you decide? The leaderboard and the live windows show it in real time.