Kalshi vs Polymarket: Which Prediction Market Is Better?

Prediction markets have exploded in popularity over the last couple of years, and two names dominate the conversation: Kalshi and Polymarket.

Both platforms allow you to trade on the outcome of real-world events. That could mean an election result, an interest-rate decision, a sporting event, the price of Bitcoin or even something as specific as the weather in a particular city.

But despite looking very similar on the surface, Kalshi and Polymarket are quite different underneath.

In this Kalshi vs Polymarket comparison, we’ll look at how the two platforms work, their fees, regulation, market selection and – importantly for readers of Honest Betting Reviews – whether either is currently available in the UK.

Kalshi vs Polymarket at a Glance

Feature	Kalshi	Polymarket
Type	Prediction market/exchange	Prediction market/exchange
Main currency	US dollars	USDC
Technology	Conventional centralised exchange	Blockchain-based on Polygon
US regulation	CFTC-regulated exchange	US operation now linked to a CFTC-designated exchange
Markets	Politics, sport, economics, crypto, weather and more	Politics, sport, crypto, economics, world events and more
Typical contract	Yes/No contract settling at $1	Yes/No share settling at $1 USDC
UK availability	Currently restricted	Currently restricted
Crypto required?	No	Yes, although onboarding has become easier
Best suited to	Users wanting a more traditional regulated trading experience	Users comfortable with crypto who value broad market choice

What Is Kalshi?

Kalshi is a US prediction market that lets users buy and sell contracts based on whether something will happen.

A typical market might ask:

Will the Federal Reserve cut interest rates at its next meeting?

You can buy either the Yes or No side.

Prices effectively represent probabilities. If a Yes contract trades at 65 cents, the market is roughly pricing the event as having a 65% chance of happening.

Correct contracts generally settle at $1, while losing contracts settle at zero.

The big selling point with Kalshi is regulation.

Kalshi has been designated as a Designated Contract Market by the US Commodity Futures Trading Commission (CFTC) since 2020.

That gives it a much more conventional financial-exchange feel than many crypto prediction platforms.

What Is Polymarket?

Polymarket works on broadly the same principle, but uses blockchain technology.

Rather than depositing normal dollars into a conventional exchange account, Polymarket markets are denominated in USDC, a stablecoin designed to track the US dollar.

The platform operates using the Polygon blockchain.

Again, contracts normally trade between 0 and 1.

Suppose you buy a Yes share at 0.40 USDC.

If the outcome occurs, that share settles at 1 USDC, giving you a gross profit of 0.60 USDC.

If it doesn’t happen, the share becomes worthless.

Polymarket has become particularly well known for political markets, elections and fast-moving world events, although it now covers a huge range of subjects.

Kalshi vs Polymarket: The Main Difference

The biggest difference is probably the infrastructure.

Kalshi feels more like a financial exchange.

You deposit money, trade contracts through an order book and withdraw your balance much as you would on a traditional trading platform.

Polymarket feels more like a crypto exchange.

Trades are denominated in USDC and its blockchain infrastructure makes transactions more transparent and verifiable.

For ordinary bettors, however, the end result is remarkably similar.

You are essentially asking:

What percentage chance do I think this event has of happening?

If your estimate differs significantly from the market price, you can take a position.

That isn’t particularly different conceptually from looking for value betting odds at a bookmaker or betting exchange.

Which Has the Better Markets?

This is one area where the answer constantly changes.

Both now cover an enormous range of subjects including:

• elections and politics
• football and other sports
• cryptocurrency
• economic announcements
• interest rates
• financial markets
• weather
• entertainment and popular culture

Historically, Polymarket developed a reputation for having a particularly broad selection of topical and political markets.

Kalshi was initially more conservative because markets had to fit within its US regulatory framework, although its offering has expanded dramatically.

By September 2026, the CFTC’s own records show Kalshi continuing to submit contracts covering areas ranging from sport to politics and weather.

So the gap between the two platforms is considerably smaller than it once was.

Kalshi vs Polymarket Fees

Neither platform operates in quite the same way as a traditional bookmaker margin.

Kalshi fees

Kalshi charges transaction fees based partly on the potential earnings of a contract.

Fees can vary between markets, and some markets can also have maker fees. The exact cost is displayed when entering a trade.

Polymarket fees

Polymarket’s current system uses taker fees on certain markets, while makers are generally not charged.

Fee levels vary by category.

Politics, sport, crypto, finance and other markets can carry taker fees, while some geopolitical and world-event markets remain fee-free.

Polymarket also says it does not charge its own fee for depositing or withdrawing USDC, although third-party providers may charge you.

For serious traders placing lots of bets, these costs matter.

For occasional users, liquidity and the spread between buying and selling prices can be just as important as the headline fee.

Which Has Better Liquidity?

Liquidity varies massively from one market to another.

The biggest presidential election, sporting and cryptocurrency markets can attract huge amounts of trading, while niche markets may have relatively little money available.

That means you shouldn’t simply compare Kalshi and Polymarket at platform level.

Check the actual market you want to trade.

A market offering a theoretically attractive price isn’t much use if you can’t get a meaningful stake matched without moving the price considerably.

This is exactly the same principle we regularly highlight when reviewing betting tipsters at Honest Betting Reviews: the price you can realistically obtain matters more than the advertised one.

Is Kalshi Available in the UK?

At present, no.

Kalshi has expanded internationally and now accepts users from numerous countries, but its current Member Agreement specifically lists the United Kingdom as a restricted jurisdiction.

Its CFTC regulation applies in the United States and should not be confused with UK regulation.

Is Polymarket Available in the UK?

Again, not currently.

Polymarket’s own geographic restrictions page lists Great Britain/United Kingdom as blocked, and the company expressly prohibits attempts to bypass geographic restrictions using a VPN.

This is an important change from the earlier days of prediction markets, when offshore platforms could sometimes appear accessible to UK users.

The UK Gambling Commission clarified its position in February 2026, saying that commercial prediction-market products meeting the definition of gambling must hold the appropriate Gambling Commission licence before operating in Great Britain.

Therefore, neither Kalshi nor Polymarket should currently be regarded as a normal UK betting option.

For UK punters, traditional regulated betting exchanges remain the more straightforward alternative.

Kalshi vs Polymarket: Which Is Better?

If we ignore geographical restrictions for a moment, there are arguments for both.

Kalshi probably has the edge for users who prefer a conventional financial platform.

It uses a more familiar account structure, doesn’t require you to understand crypto and operates as a CFTC-designated exchange.

Polymarket probably appeals more to traders who value crypto infrastructure and a very broad range of markets.

The use of USDC and blockchain technology also means there is an unusually high level of transparency surrounding activity on the platform.

Neither is automatically “better”, though.

What matters most is:

1. Whether the platform is legal and available where you live.
2. Whether it offers the market you want.
3. How liquid that market is.
4. The price available.
5. The fees and spread involved.

Kalshi vs Polymarket: Our Verdict

Kalshi and Polymarket represent an interesting development in the line between betting and financial trading.

In practical terms, many of their markets aren’t dramatically different from something you might find on a betting exchange. Rather than backing an outcome at decimal odds, you buy a contract based on its implied probability.

Kalshi’s main advantage is its US regulatory structure and more traditional trading setup, while Polymarket’s strengths are its crypto-based infrastructure and extensive selection of event markets.

For UK readers, however, the most important point is simple.

Neither Kalshi nor Polymarket is currently available for normal UK customers.

Both specifically restrict UK users at the time of writing, so anyone looking for similar markets should stick to appropriately licensed British bookmakers and betting exchanges.

Prediction markets are undoubtedly worth watching, though.

They are growing extremely quickly in the United States, and with UK regulators now actively considering how these types of products should be treated, it wouldn’t be surprising to see prediction-market-style betting become a much bigger part of the British betting landscape in the years ahead.