Kalshi vs Polymarket Comparison 2026: Which Prediction Market is Better?

Kalshi vs Polymarket comparison

Kalshi and Polymarket are the two biggest prediction markets in the United States, with the two behemoths constantly fighting it out for the number one spot. But how can you decide which one of these platforms to join?

While there’s not much to separate them in terms of user base, liquidity, and market diversity, each site has its own individual strengths and weaknesses. For instance, Kalshi is better for fiat deposit methods and trading event contracts in USD, while Polymarket is more crypto-friendly.

Before we take a more forensic look at what each site has to offer, here’s a comparison table covering the key metrics:

Polymarket vs Kalshi – The pros and cons

Here are the main advantages and disadvantages of each site that we’ll focus on in more detail below:

Kalshi vs Polymarket: differences in platforms, regulation, and availability

Kalshi operates as a Designated Contract Market (DCM) that offers prediction market trading through event contracts. Meanwhile, Polymarket offers access to prediction markets via its Polymarket US app.

Both platforms are overseen federally in the United States by the Commodity Futures Trading Commission (CFTC). As a result, they are technically available to verified US citizens and residents aged 18+ in most US states.

However, some sites have outright or partial unavailability in certain states. The landscape is moving quickly in this respect, so we recommend that you consult the platforms’ Terms of Service for current updates.

Kalshi vs Polymarket: volume and market diversity

Since their inception, Kalshi and Polymarket have consistently overtaken each other in terms of trading volume. Both sites have reported monthly trading volume figures of between $3 billion and $ 4.4 billion. As explained in our Kalshi vs Robinhood, these figures put Kalshi and Polymarket way ahead of the pack and in a league of their own.

For you as a trader, this means that market liquidity is unlikely to ever be an issue, especially for popular prediction markets like NFL sports games and US elections. However, even for niche markets such as overseas GDP, you’ll regularly find trading volume reaches six-figure sums.

Both sites have a large and diverse selection of prediction markets, covering categories like sports, culture, politics, economics, and more. While Kalshi is probably a bit better with the traditionalists, mainly related to high-profile sports events and US elections, Polymarket stands out for crypto prediction markets.

For example, Polymarket is the only platform that offers 5-minute cryptocurrency prediction markets for BTC and other blockchains, stablecoins, and altcoins.

Kalshi and Polymarket account funds; deposits, withdrawals, and trading currency

This is one area where the two platforms are distinctly different.

Buying event contracts on Kalshi and Polymarket

On both platforms, event contracts cost between $0.01 and $0.99 in the lead-up to the future event. Once the event has passed and the prediction market is resolved, the contracts tied to the correct outcome close at $1.00, with all incorrect event contracts closing at $0.00.

Both platforms offer you the option to buy in contracts and dollars, and place limit orders with a maximum price limit to prevent slippage. On Kalshi, the limit order option has a few more options, including time limits. If the executed price doesn’t meet your limits within the time frame, the trade is automatically cancelled.

Kalshi vs Polymarket: trading fees

On balance, Polymarket is the more favorable option when it comes to taker trading fees, as there are fixed taker fees by category, ranging from 0.04 to 0.07 per contract for most markets. Meanwhile, there are certain geopolitical markets with no taker fees at all.

If you place trades that don’t have a counterpart, you can get a maker rebate of up to 20% if someone takes the trade. This acts as a reward for adding liquidity to the market.

On the other hand, Kalshi has a complex tier fee structure where you can pay anything up to $1.75 per 100 event contracts. Rather than rebating market makers, the fees are usually 50% lower than the taker fees, and occasionally waived completely.

Kalshi vs Polymarket arbitrage

There is nothing in the rules on Kalshi or Polymarket to stop you from placing cross-platform arbitrage trades. This involves buying opposing outcomes on either platform. In other words, if you bought “Yes” contracts on Kalshi, you’d buy “No” on Polymarket so that you get a payout no matter what happens.

However, this is extremely risky, especially because the event contract prices move very quickly on many prediction markets. This means that by the time you’ve placed your trade on one site, the price on the other outcome could have moved, or the order won’t execute quickly enough, giving you two uneven trades.

As well as slippage, you also have to consider that the two platforms have different fee structures that need to be factored in when calculating your potential profits from a trade. At the end of the day, it’s a strategy that we’d advise against unless you’re a very experienced event contract trader.

Polymarket or Kalshi – The final decision

To summarize, Kalshi and Polymarket are the two biggest prediction market platforms in the US by quite a distance. Both are CFTC-regulated and are available to users aged 18+ in most of the US. However, there may be outright or partial restrictions in some states, so check to see if the platforms are available where you are first and foremost.

For many people, it will be a toss-up or a matter of personal taste which is best, as both sites have high liquidity, a massive user base, and a user-friendly platform. Polymarket is slightly better for fees and offers maker rebates, which will appeal to some traders. However, if you’re not a crypto user, Kalshi could still be the best option.

Whatever you decide, take the time to understand the risks of prediction market trading before you get started. Once you’ve decided which one to pick, you can sign up by clicking the relevant promo banner on this page.

Compare the offers and features at Kalshi and Polymarket

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