Kalshi vs Polymarket: Fees, Markets, Volume, and Which Is Better

Kalshi vs Polymarket comes down to clear differences in fees, markets, volume, and overall fit: Kalshi leads as the CFTC-regulated, USD-based exchange with stronger 2026 volume (especially sports), while Polymarket offers broader crypto-native global markets and a newer regulated US option, here’s exactly how they compare so you can choose which is better for you.

Key Takeaways

• Kalshi is a CFTC-regulated exchange built around USD deposits and has pulled ahead of Polymarket in overall trading volume through 2026, driven heavily by sports contracts.

• Polymarket remains the more crypto-native option, with broader category coverage internationally and a newer, separately regulated Polymarket US product for domestic traders.

• Fees on both platforms are not flat; they scale with how close a contract's price sits to 50 cents, and both have moved away from fee-free trading as volume has grown.

What Kalshi and Polymarket Actually Are

Kalshi: The Regulated Prediction Market

Kalshi is a federally regulated prediction market exchange that lets US residents trade event contracts on outcomes like economic data, elections, and sports, settled directly in US dollars.

Polymarket: The Blockchain-Based Platform

Polymarket is a blockchain-based prediction market platform that uses USDC settlement and, on its global exchange, has historically operated outside direct CFTC oversight while serving traders around the world.

Shared Growth and Valuation

Both companies were founded around the same time (Kalshi in 2018, Polymarket in 2020) and both have grown at a pace that has genuinely surprised the wider finance industry.

By early 2026, the two platforms combined were clearing tens of billions of dollars in monthly volume, up from well under $5 billion a month less than a year earlier, and each has reportedly been in talks with investors about funding rounds that could value them at roughly $20 billion apiece.

Kalshi vs Polymarket in Plain English

How Kalshi Works

Think of Kalshi as a regulated stock exchange for questions instead of companies. You deposit dollars, buy a "yes" or "no" contract on something like "Will the Fed hike rates this month?", and the contract settles at $1 or $0 depending on the outcome. Everything happens inside a system that answers to the Commodity Futures Trading Commission.

How Polymarket Works

Polymarket works on a similar "yes or no, settles at $1 or $0" logic, but the plumbing is different. Trades are recorded and settled through smart contracts on the Polygon blockchain, funded with USDC rather than a bank transfer.

That crypto-native structure is part of why Polymarket has attracted a global, wallet-first user base, while also being the reason it was, for years, unavailable to people trading from inside the United States.

The People and Companies Behind the Rivalry

Kalshi’s Founders and Backers

Kalshi was co-founded by Tarek Mansour and Luana Lopes Lara, and it holds approval from the CFTC to operate as a Designated Contract Market, the same regulatory category used by traditional futures exchanges. Its backers include Sequoia Capital and Paradigm, among others.

Polymarket’s Founder and Major Investment

Polymarket was founded by Shayne Coplan and built its early reputation on politics and culture markets before expanding into sports and crypto. Intercontinental Exchange, the parent company of the New York Stock Exchange, agreed to invest up to $2 billion in Polymarket in 2025, and the company has since moved to launch a separately regulated Polymarket US exchange aimed at domestic traders.

Beyond Product Competition

The two companies' rivalry has also spilled well beyond product competition, with both sides lobbying regulators in Washington and, according to reporting, accusing each other of copying product launches.

Kalshi vs Polymarket Fees: What You Actually Pay

Neither platform charges a simple flat percentage, and it's worth checking the current fee schedule on each site before trading, since both have adjusted pricing more than once in 2026.

Kalshi’s Fee Structure

Kalshi charges a formula-based taker fee that rises the closer a contract's price sits to 50 cents and shrinks toward zero at extreme prices (very likely or very unlikely outcomes).

In practice this usually works out to a fraction of a cent per contract at the edges and roughly a penny and a half to two cents per contract at the 50-cent midpoint, with a reduced rate for resting limit orders that add liquidity (maker orders).

Polymarket’s Fee Structure

Polymarket's global exchange introduced category-based taker fees in 2026 after years of largely fee-free trading. Rates vary by market type, with geopolitics markets typically remaining fee-free, sports and politics-style categories sitting in the lower-to-middle range, and crypto markets carrying the highest taker fee.

Maker orders on Polymarket's global exchange are free and can earn a share of collected taker fees as a rebate. Polymarket US, the newer regulated product, instead uses a flatter, uniform taker fee with its own maker rebate.

Bottom Line on Fees

The short version: for large, high-conviction taker trades near 50/50 odds, both platforms' fees land in a broadly similar ballpark once you account for category differences, while resting limit orders are the cheaper way to trade on either platform.

Kalshi vs Polymarket Markets: What You Can Trade

Polymarket’s Broader Catalog

Polymarket has generally offered a wider spread of categories, including politics, sports, crypto, finance, culture, weather, and technology, and has historically listed a larger raw number of simultaneous markets than Kalshi.

Kalshi’s Focus Areas

Kalshi's catalog has traditionally centered on economics, weather, elections, and entertainment-style events, but sports contracts have become the platform's dominant category by volume through 2026, alongside continued growth in financial and macroeconomic markets like Federal Reserve decisions.

Where the Platforms Overlap and Differ

In practice, the two platforms overlap heavily on major US sports leagues, elections, and macroeconomic releases, while Polymarket tends to move faster on niche, trending, or international topics, and Kalshi tends to offer a more tightly defined resolution process on the markets it does list.

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Kalshi vs Polymarket Volume in 2026

Trading volume is where the picture has shifted the most this year. Combined monthly volume across both platforms climbed from under $5 billion in September 2025 to roughly $24 billion by April 2026, according to a Pew Research Center analysis of data from digital-assets research firm The Block.

Kalshi’s Lead in Volume Share

Kalshi pulled ahead of Polymarket in overall monthly volume starting around September 2025, a lead driven largely by the surging popularity of its sports markets, and industry data trackers have since put Kalshi's weekly share of combined volume at roughly 84 to 86 percent against Polymarket's 14 to 16 percent through early September 2026.

Other Metrics and Recent Trends

That said, volume isn't the only lens worth using. Depending on the period and data source measured, the two platforms have traded places on raw dollar volume more than once in 2026, and Polymarket's open interest and market count have at times run close to or ahead of Kalshi's.

Combined monthly volume across both platforms did see its first month-over-month decline in over a year in August 2026, easing off after a World Cup-driven surge earlier in the summer.

Quick-Reference Cheat Sheet

• Regulation: Kalshi is CFTC-regulated and built for US residents; Polymarket's global exchange has operated largely outside CFTC oversight, while its newer Polymarket US product targets the domestic, regulated market.

• Funding currency: Kalshi settles in US dollars via bank transfer; Polymarket's global exchange settles in USDC through a crypto wallet.

• Fee style: Both use formulas that peak near 50-cent contracts, but Kalshi applies one general formula while Polymarket varies fees by market category.

• Market breadth: Polymarket generally lists more total markets and covers more niche categories; Kalshi has concentrated growth in sports and macro events.

• Volume trend: Kalshi has led on combined dollar volume for most of 2026, with sports contracts as the main driver.

• Access: Kalshi is restricted in roughly 50-plus countries outside the US; Polymarket's global exchange is officially unavailable to US residents, though its new domestic product is aimed at closing that gap.

Read Also: Will Kalshi Beat Polymarket Soon? Analyzing Valuations

Summary

Kalshi and Polymarket have grown from experimental startups into major financial platforms, each backed by big institutional investors (including a stake from the NYSE’s parent company in Polymarket).

The key difference:

• Kalshi: Fully regulated, dollar-based, built for US traders.

• Polymarket: Broader global markets + crypto-native setup (with a regulated US version now launching).

Fees are no longer near-zero on either platform, so always check the current fee schedule. Neither is clearly better, the right choice depends on your location, the markets you want to trade, and whether you prefer regulatory safety or wider market access.

Disclaimer: The views expressed belong exclusively to the author and do not reflect the views of this platform. This platform and its affiliates disclaim any responsibility for the accuracy or suitability of the information provided. It is for informational purposes only and not intended as financial or investment advice.

FAQ

Is Kalshi or Polymarket better for beginners?

Kalshi tends to be simpler for US-based beginners since it accepts direct USD deposits and doesn't require a crypto wallet. Polymarket's global exchange requires USDC funding and a basic understanding of wallets, which adds a learning curve for traders new to crypto.

Which platform has lower fees, Kalshi or Polymarket?

Neither platform charges a flat fee. Both scale fees based on how close a contract's price is to 50 cents, and Polymarket's fees also vary by market category. For similar trade sizes near 50/50 odds, effective costs on the two platforms are often comparable, so it's worth checking each platform's current fee schedule for the specific market you're trading.

Can I use Polymarket if I live in the United States?

Polymarket's global exchange has officially blocked US residents since a 2022 settlement with US regulators, though the company has been rolling out a separately regulated Polymarket US product intended for domestic traders. Kalshi, by contrast, is built specifically for US residents under CFTC approval.

Does Kalshi or Polymarket have more trading volume?

Kalshi has generally led in combined monthly trading volume through most of 2026, aided heavily by sports contracts, with industry trackers putting its share of combined weekly volume in the 80-plus percent range by early September 2026. Volume leadership between the two platforms has shifted at various points earlier in their history, so it's worth checking current data rather than assuming the gap is fixed.

Is Kalshi or Polymarket safer to use?

Kalshi operates as a CFTC-regulated Designated Contract Market, which brings oversight similar to traditional futures exchanges. Polymarket's global exchange operates with less direct US regulatory oversight, though it has expanded compliance efforts, including its Polymarket US product. Neither structure eliminates trading risk, and prediction market contracts can result in a total loss of the amount traded.

Disclaimer: The views expressed belong exclusively to the author and do not reflect the views of this platform. This platform and its affiliates disclaim any responsibility for the accuracy or suitability of the information provided. It is for informational purposes only and not intended as financial or investment advice.