Kalshi vs Polymarket: What’s the Difference?
Last updated: July 8, 2026
In prediction markets, traders speculate on real-world events by buying and selling contracts tied to future outcomes.
Kalshi and Polymarket are the two biggest names in the space — and they could hardly be built more differently. Kalshi is a centralized, dollar-based exchange that clears every trade in-house. Polymarket is a decentralized platform where trades settle in stablecoins on the Polygon blockchain.
That makes this a comparison of two fundamentally different architectures. How trades settle, how markets resolve, what happens to your money while you wait — each question gets a different answer depending on which platform you ask.
This comparison breaks down the key differences, which platform might best suit your trading needs — and what neither of them offers.
Kalshi vs Polymarket at a Glance
| Kalshi | Polymarket | |
|---|---|---|
| Architecture | Centralized exchange with in-house clearing | Decentralized, settled on-chain (Polygon) |
| Trading currency | US dollars | USDC stablecoin |
| Custody | Kalshi holds your funds | Self-custody Web3 wallet |
| Yield on open positions | None | None |
| Trading fees | Taker fees up to ~1.75¢ per contract; maker fees ~25% of that | Category-based taker fees since March 2026; maker orders free |
| Market resolution | Determined by Kalshi per contract rulebook | UMA’s Optimistic Oracle with open dispute window |
| Market types | Binary YES/NO contracts, plus multi-leg Combos | Binary and multi-outcome; curated long tail |
| Onboarding | Brokerage-style account and bank funding | Email/Google login or Web3 wallet |
One row is worth pausing on: neither platform pays you anything on the capital locked in your open positions. It’s the one column where the industry’s two giants give the same answer — and where a third option gives a different one.
What Is Kalshi?
Kalshi is a centralized prediction market and the largest in the industry by volume. It runs like a traditional exchange: dollar-denominated accounts, a central limit order book, and brokerage-style onboarding with bank funding. There’s no blockchain anywhere in the stack.
Trades clear through Kalshi’s own clearinghouse, and outcomes are determined by Kalshi itself according to each contract’s rulebook and its named data source. For anyone who has used a stock trading app, the whole experience feels familiar from the first screen.
Key Features
- Centralized exchange with US dollar trading
- Brokerage-style accounts with no crypto knowledge needed
- In-house clearing and settlement
- Deposits via ACH, debit card, PayPal, Venmo, wire, and crypto
- Deep liquidity on sports markets, with additional coverage of economic events
- Familiar brokerage-style order types and interface
Fees
- Trading: formula-based taker fees of roughly 0.07 × contracts × price × (1 − price), peaking around 1.75¢ per contract near 50¢; maker fees about a quarter of that
- Deposits: free via ACH and wire; up to 2% on card deposits
- Withdrawals: free via ACH
The platform crossed roughly $40 billion in trailing-year volume by early 2026, with sports accounting for around 87% of all trading.
What Is Polymarket?
Polymarket is a decentralized prediction market built on the Polygon blockchain. Launched in 2020, it lets users trade YES/NO outcomes using the USDC stablecoin, with every trade settled on-chain by smart contracts. Since acquiring the exchange QCEX, it serves US users as well.
Outcomes are verified by UMA’s Optimistic Oracle rather than by the platform itself: results are proposed on-chain, anyone can dispute them during a challenge window, and contested cases are decided by UMA token holders. Winning shares convert to $1; losing shares become worthless.
Key Features
- Blockchain-based (Polygon network)
- USDC stablecoin trading
- Decentralized settlement via smart contracts
- Global access, including the US via QCEX
- Fast-turnaround markets on breaking news, politics, and culture
- Sign up with email or Google — a Web3 wallet is optional
Fees
- Trading: category-based taker fees since March 2026 (roughly 0.75–1.8% at even odds); maker orders free
- Deposits: no platform fees (third-party on-ramp providers may charge)
- Withdrawals: no platform fees (blockchain gas fees apply)
Polymarket crossed $9 billion in cumulative trading volume in 2024, making it the largest decentralized prediction market by volume.
Key Differences
Technology and Infrastructure
Kalshi is a traditional exchange: a central limit order book, dollar-denominated accounts, and in-house clearing. Kalshi holds your funds, matches your orders, and settles your contracts, much like a stock brokerage. It’s a proven model, and it’s what lets the platform feel familiar to anyone who’s traded equities.
Polymarket is the opposite: every trade executes as an on-chain transaction on Polygon, with smart contracts handling matching and settlement. You keep custody of your funds in your own wallet, and no central operator ever holds your balance. The trade-off is that your money lives in USDC, and moving between dollars and stablecoins is on you.
Fees
Kalshi charges trading fees on matched taker orders, calculated from the contract price: the closer to 50¢, the higher the fee, peaking around 1.75¢ per contract. Maker orders cost about a quarter of the taker fee. ACH deposits and withdrawals are free, though card deposits can cost up to 2%.
Polymarket traded fee-free for years, but introduced category-based taker fees in March 2026 — roughly 0.75–1.8% at even odds depending on the market category, with maker orders still free. Deposits and withdrawals carry no platform fees, though gas and on-ramp costs apply. In practice the two platforms now cost broadly similar amounts to trade on; which is cheaper depends on whether you make or take liquidity.
User Experience
Kalshi feels like a brokerage: sign up, connect a bank account, and trade in dollars. For anyone used to traditional trading apps, it’s the path of least resistance, with no crypto knowledge required. The trade-off is a longer account setup before you can place your first trade.
Polymarket is distinctly crypto-native. Signing up now supports email or Google login, which creates a Polygon wallet behind the scenes, but depositing still means acquiring USDC and a degree of comfort with on-chain mechanics. For crypto-native traders that’s no obstacle; for newcomers it’s a steeper first step than Kalshi’s bank transfer.
Resolutions
Kalshi resolves markets itself. Each contract has a rulebook naming a data source (an official statistic, a league result, a published report), and Kalshi settles according to those rules. It’s fast and predictable, but it’s a single entity making the call.
Polymarket uses UMA’s Optimistic Oracle: outcomes are proposed on-chain, a challenge window opens for disputes, and contested resolutions escalate to UMA token holders for a final ruling. No centralized team determines results — the trade-off is that disputed markets can take longer to settle than a rulebook decision.
Market Coverage
Kalshi’s volume is dominated by sports, alongside its signature economic markets (inflation prints, Fed rate decisions, jobs numbers) that benefit from official, unambiguous data sources. Because Kalshi lists every market itself, coverage is curated: deep where it chooses to focus, thinner in the long tail.
Polymarket’s catalog leans toward politics, culture, crypto, and breaking news, with its markets team spinning up fast-turnaround coverage of whatever the world is arguing about that week. Its volume advantage among decentralized platforms means deeper liquidity on major markets, and multi-outcome markets let it price crowded fields like elections properly.
Yield on Open Positions
Here the two platforms agree, and not in your favor: on both, capital committed to an open position does nothing until the market resolves. Whether it’s dollars in Kalshi’s clearinghouse or USDC locked in Polymarket’s smart contracts, your collateral sits idle — for days, weeks, or months on longer-dated markets.
If capital efficiency matters to you, this is where Predict enters the picture. On Predict, the collateral backing open positions is routed through Venus Protocol on BNB Chain and earns yield until resolution — on top of support for multi-outcome markets and low-risk Bond Markets. It’s the one structural feature neither of the two giants currently offers.
Which Platform Is Better?
The answer depends on your priorities.
Choose Kalshi if:
- You prefer trading in dollars through a familiar brokerage-style experience
- You need the deepest liquidity on sports and economic markets
- You want to fund your account with a bank transfer, card, PayPal, or Venmo
- You’d rather avoid crypto entirely
Choose Polymarket if:
- You want the widest variety of markets, including a long tail of breaking-news and culture events
- You prefer self-custody and on-chain settlement over trusting a central operator
- You value decentralized resolution through UMA’s oracle over a single entity’s rulebook
- You’re comfortable holding and moving stablecoins
Conclusion
Kalshi and Polymarket sit at opposite ends of the prediction market spectrum: Kalshi optimizes for mainstream familiarity and dollar-based trading, while Polymarket optimizes for decentralization and breadth of coverage.
Kalshi delivers the largest volume in the industry and a trading experience that feels like a brokerage. For traders who want dollars in, dollars out — and deep sports liquidity — it’s the default choice.
Polymarket delivers self-custody, oracle-based resolution, and the liveliest long tail of markets in the space. For crypto-native traders who want to hold their own funds and trade whatever the news cycle serves up, it remains the benchmark.
And if neither answer satisfies — because both leave your capital idle while positions are open — there’s a third option. Predict combines Polymarket’s on-chain architecture with something neither platform offers: yield on open positions via Venus Protocol. See how it compares to Kalshi and Polymarket directly.
Frequently Asked Questions
What is the main difference between Kalshi and Polymarket?
Architecture. Kalshi is a centralized exchange: you trade event contracts in US dollars, and Kalshi clears, settles, and resolves every trade itself. Polymarket is decentralized: trades settle in USDC on the Polygon blockchain via smart contracts, you keep custody of your funds, and outcomes are resolved by UMA’s Optimistic Oracle rather than by the platform.
Which is bigger, Kalshi or Polymarket?
Kalshi is the largest prediction market overall, crossing roughly $40 billion in trailing-year volume by early 2026, driven mostly by sports. Polymarket is the largest decentralized prediction market, having crossed $9 billion in cumulative volume in 2024, with its strength in politics, culture, and breaking news.
How do Kalshi and Polymarket resolve markets?
Kalshi determines outcomes itself, following each contract’s rulebook and its named data source — fast and predictable, but a single entity makes the call. Polymarket uses UMA’s Optimistic Oracle: results are proposed on-chain, anyone can dispute during a challenge window, and contested cases are settled by UMA token holders.
Which has lower fees, Kalshi or Polymarket?
They’re broadly comparable now. Kalshi charges taker fees that peak around 1.75¢ per contract near 50¢, with maker fees about a quarter of that and free ACH transfers. Polymarket introduced category-based taker fees in March 2026 — roughly 0.75–1.8% at even odds — with maker orders free. Which works out cheaper depends on whether you make or take liquidity.
Is there an alternative to Kalshi and Polymarket?
Predict.fun is the leading alternative for capital efficiency. Like Polymarket, it’s decentralized — trades settle on-chain (on BNB Chain) and resolve through UMA’s Optimistic Oracle. Unlike either platform, the collateral backing your open positions earns yield through Venus Protocol until resolution, and onboarding takes an email, Google, or X login with no Web3 wallet setup.
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