Last November I watched the election results come in with two browser tabs open. One showed my Kalshi positions on KXPRESPARTY printing nicely. The other showed my old Polymarket account, frozen and inaccessible from my Chicago apartment since January 2025. I'd made money on both platforms during the 2024 cycle, but only one of them let me withdraw to my US bank account without a VPN and a prayer. That distinction matters more than most comparison articles will tell you.
Let me be direct about this because I see people in Telegram channels still getting it wrong. Polymarket is not legal for US persons. Full stop. In January 2025, they implemented geofencing that blocks US IP addresses and requires non-US identity verification. Some American traders still use VPNs and foreign documents to access it. I'm not going to tell you what to do with your life, but I will tell you that's a violation of their terms of service and potentially US law.
Kalshi, on the other hand, is a CFTC-regulated exchange. That means:
The tradeoff is real. Kalshi requires KYC, which means uploading your ID and waiting for verification. You can only fund with USD from US bank accounts or debit cards. No crypto deposits. For some people that's a dealbreaker. For me, it means I can actually report my gains without worrying about explaining USDC flows to the IRS.
Here's where I have to be honest about Kalshi's weakness. Polymarket has deeper liquidity on major political events. During the 2024 election, their presidential markets had millions in open interest while Kalshi's were in the hundreds of thousands. That gap has narrowed somewhat in 2026, but it still exists.
However, liquidity only matters if you can access it. And for US traders, Polymarket's liquidity is theoretical. You can look at it. You can't trade it legally.
Kalshi's market selection has expanded significantly. You can trade:
I spend most of my time on the economic data markets. Old habits from the CME desk, I guess. The Fed decision markets have gotten liquid enough that I can move a few thousand dollars without massive slippage. That wasn't true two years ago.
Polymarket charges no direct trading fees, which sounds great until you factor in the spread and the gas costs on withdrawals. They make money on the spread between yes and no prices.
Kalshi charges exchange fees that vary by market, typically a few cents per contract. They're transparent about it. You see the fee before you confirm the trade. For active traders, these fees add up, but they're predictable.
What actually costs me more money isn't the fees. It's the spreads during low-liquidity periods. If you're trading Kalshi markets at 3 AM Chicago time, expect to pay for that convenience. The tightest spreads show up during US market hours, especially around economic data releases.
Polymarket's interface is cleaner. I'll give them that. It feels more like a modern crypto app. Kalshi's web interface has improved but still feels a bit like it was designed by compliance lawyers (because it probably was).
That said, Kalshi's mobile app is solid. I've placed trades from the Blue Line when CPI numbers dropped while I was commuting. The order entry is simple enough that you won't fat-finger a position size, which is more than I can say for some crypto exchanges.
For analysis and trade ideas, I run a Telegram channel where we discuss Kalshi setups in real time. The community has gotten better at finding edges, especially in the economic data markets where my background actually helps.
This isn't really a fair fight in 2026. If you're a US trader, Kalshi wins by default because it's the only legal option. But that framing undersells what Kalshi has become.
Two years ago, I would have told you Kalshi was a worse product you had to use because of regulations. Today, I'd say it's a legitimate trading venue that happens to also be the only legal choice. The liquidity has improved. The market selection covers most of what I want to trade. The Kalshi platform handles my deposits and withdrawals without drama.
Polymarket still has advantages in global liquidity and crypto-native features. If you're not a US person, it's worth considering. But for Americans, the calculus is simple. You can trade legally and sleep well, or you can use a VPN and hope nobody notices. I know which one I'm choosing.
No. Polymarket implemented geofencing in January 2025 and requires non-US identity verification. US persons are prohibited from trading on the platform. Some Americans use VPNs to circumvent this, but that violates the platform's terms of service and potentially US regulations. Kalshi remains the only CFTC-regulated prediction market available to US traders.
Polymarket generally has deeper global liquidity on major political events, with more total money in their election markets. However, US traders cannot legally access this liquidity. Kalshi's political market liquidity has improved substantially since 2024, and for Americans, it represents the only legal option for trading these outcomes.
No. Kalshi is a USD-only platform that accepts deposits via US bank transfers (ACH), wire transfers, and debit cards. This is part of their regulatory compliance as a CFTC-regulated exchange. If you need to deposit crypto, you'll need to convert to USD first through a separate exchange before funding your Kalshi account.
No. Kalshi requires full identity verification for all users, including government ID and personal information. This is required by CFTC regulations. The verification process typically takes a few hours to a couple days. While this adds friction compared to crypto-native platforms, it's what allows Kalshi to operate legally for US customers.
Not financial advice. I trade my own money and you can lose yours. Do your own research.