Kalshi's Primary Revenue Stream: The Trading Fee
Kalshi operates as a neutral exchange platform and does not possess any financial stake in whether event outcomes swing in one direction or another. Its revenue model revolves around transaction fees rather than positions on specific outcomes.
The fee is charged when you buy or sell a contract. It is not charged at settlement. once your contract resolves to $1 or $0, no fee is added. The formula Kalshi uses to calculate the taker fee is:
Fee = round up to nearest cent (0.07 × C × P × (1 − P))
Where C is the number of contracts and P is the contract price in dollars (so a 45-cent contract has P = 0.45). This formula creates an inverted U fee curve. Fees peak at P = $0.50 (50/50 odds) and decline toward $0.01 or $0.99.
A maker fee also applies on some markets, using a lower multiplier of 0.0175 instead of 0.07. Kalshi occasionally runs zero-fee promotions on specific markets to bootstrap liquidity.
The Fee Formula in Practice: Worked Examples
The inverted U curve means that trading contracts close to even money (around $0.50) costs more in fees than trading contracts at extreme probabilities (near $0.01 or $0.99). This is intentional: it prevents fees from eroding the small potential upside on low-probability contracts.
| Contract price | Contracts purchased | Fee (taker rate) | Fee as % of stake |
|---|---|---|---|
| $0.50 (50/50) | 100 | $1.75 | 3.5% |
| $0.50 (50/50) | 1,000 | $17.50 | 3.5% |
| $0.75 (75% probability) | 100 | $1.32 | 1.75% |
| $0.25 (25% probability) | 100 | $1.32 | 5.25% |
| $0.10 (10% probability) | 100 | $0.63 | 6.3% |
| $0.90 (90% probability) | 100 | $0.63 | 0.7% |
A few things stand out from the table. First, the fee at $0.50 is the highest in absolute terms. Second, as a percentage of your stake, low-probability contracts (say $0.10) look expensive because your stake is small relative to the fee. Third, high-probability contracts ($0.90) have a very low fee as a percentage of stake, which matters for traders using prediction markets as hedging instruments. Always verify the exact fee amount shown in the order confirmation screen before submitting, since Kalshi may update the multiplier over time. For a full fee comparison against Polymarket, see our Kalshi versus Polymarket guide.
Other Ways Kalshi Makes Money
Trading fees are the dominant revenue source, but Kalshi earns money in three main ways: per-trade fees on most markets, interest earned on customer cash balances, and a growing stream of data, API, and partnership revenue.
Interest on customer cash balances
Kalshi holds all customer funds in segregated accounts as required by the CFTC. Rather than leaving those funds idle, Kalshi invests them in short-term instruments and earns interest on the float. It passes part of this back to users in the form of the 3.95% APY on idle cash balances, and retains the spread between what it earns and what it pays out. With tens of millions of dollars sitting in customer accounts at any given time, this is a meaningful secondary revenue source.
Data and API licensing
Kalshi's prediction market prices are genuine real-time probability estimates generated by active trading. These prices have attracted interest from hedge funds, asset managers, and institutional traders who use them as forward-looking indicators for other markets. Kalshi licenses access to its market data and APIs to institutional users, generating revenue from the informational value of its order flow rather than just from retail trading fees.
Partnership and media revenue
Kalshi has signed official partnerships with Major League Baseball, the NHL, and other sports organisations. These partnerships include data and content licensing arrangements that generate fees alongside the trading activity they help drive. The Robinhood integration, which routes approximately 25 to 35% of daily trading volumes through the platform, also has a commercial structure around it.
Withdrawal and deposit fees
Kalshi charges a small processing fee on debit card withdrawals, a $5 fee on wire transfers, and network fees on crypto transactions. Debit card deposits may also carry a processing fee depending on the card type. ACH deposits and withdrawals are free. These are not primary revenue sources but are part of the complete fee picture for users.
Perpetual futures fees (pending)
Kalshi launched its perpetual futures product with zero trading fees to build liquidity. The crypto perps product generated substantial volume from the start but contributed minimal fee revenue during its initial launch phase. When Kalshi eventually turns on fees for perpetuals, this could become a significant additional revenue stream, particularly given the scale of perpetual futures trading globally on offshore venues.
How Fast Has Kalshi's Revenue Grown?
Kalshi's fee revenue has grown sharply as prediction market adoption accelerated. The figures below come from industry research and financial reporting rather than official Kalshi disclosures, since the company is privately held and does not publish audited accounts.
| Period | Estimated fee revenue | Key driver |
|---|---|---|
| 2023 | ~$1.8 million | Early growth phase, limited market breadth |
| 2024 | ~$24 million | Election cycle volume, sports category expansion |
| 2025 | ~$260 to $263 million | Sports category growth, Robinhood integration, user base expansion |
| Annualised run-rate (late 2025) | ~$600 to $700 million | Sustained sports volume growth |
Monthly volume rose from $226 million in December 2024 to $6.6 billion in December 2025 and $29.2 billion by June 2026. The revenue concentration in sports is notable: over 89% of estimated 2025 fee revenue came from sports contracts. This has shaped the ongoing state-level legal disputes over whether sports event contracts should be regulated as gambling rather than financial derivatives. For more on this, see our guide on prediction market legality.
How Kalshi's Revenue Model Differs From a Sportsbook
The difference between how Kalshi makes money and how a traditional sportsbook makes money is significant, and worth understanding as a trader.
| Feature | Kalshi (exchange model) | Traditional sportsbook (bookmaker model) |
|---|---|---|
| Who takes the other side of your trade? | Another trader on the platform | The sportsbook itself |
| How does revenue come from losers? | It does not. Kalshi earns the same fee win or lose | Sportsbook profits when you lose; losses fund payouts and margin |
| Fee structure | Formula-based trading fee on each transaction | Built-in margin ("vig" or "juice") on offered odds |
| Price setting | Prices set by traders on a live order book | Odds set by the bookmaker's trading team |
| Interest in outcome | None. Kalshi earns regardless of the result | Direct financial interest in specific outcomes |
| Regulatory framework | CFTC Designated Contract Market | State gambling licence |
The exchange model means Kalshi is structurally aligned with providing a fair, liquid market, and its revenue grows with volume, not from user losses. For a deeper comparison of prediction markets versus traditional sportsbooks, see our guide on prediction markets vs sportsbooks.
What This Means for Traders
Understanding how Kalshi makes money helps you calculate your actual expected returns more precisely.
- Fees are charged on both sides of a round trip. If you buy a contract and later sell it before resolution, you pay a fee on both the buy and the sell. Factor this into your break-even calculation, particularly for trades where you plan to exit early rather than hold to resolution.
- The fee is highest around $0.50. Contracts near even-money carry the highest absolute fee. If you frequently trade contracts near the midpoint, your total fee drag is higher than it would be trading at more extreme probabilities.
- No fee at settlement. If you hold to resolution and win, you receive the full $1.00 per contract with no additional settlement fee deducted. The fee was already taken when you bought or sold.
- Maker fees are lower. If you place a limit order that rests in the order book and is matched by another trader, you may pay the maker fee (0.0175 multiplier rather than 0.07). This is roughly a quarter of the taker fee and is a meaningful cost advantage for high-volume traders who use limit orders consistently.
- Special markets may have different rates. Some markets have fees different from other markets, often due to special events such as elections, awards ceremonies, or large sporting championships. Always confirm the fee shown in the order screen before trading major event markets.
The Bottom Line on How Kalshi Makes Money
Kalshi makes money from a formula-based trading fee that peaks at even-money contracts and tapers toward the probability extremes, supplemented by interest on customer cash, data licensing, and partnership revenue. It does not make money from your losses, does not set prices, and takes no position on any outcome. There is no spread markup beyond the public order book, no platform fee, and no charge to hold a position all the way to settlement. Revenue scales with trading volume, which is why Kalshi's growth focus is on increasing the number and size of trades rather than on widening the margin on any individual position. For the full picture of how Kalshi works as a trading platform, see our how Kalshi works guide and our Kalshi review.
How Does Kalshi Make Money? FAQ
How does Kalshi make money?
Kalshi makes money primarily through a small transaction fee charged on every contract bought or sold. The fee follows the formula: 0.07 × number of contracts × price × (1 minus price), rounded up to the nearest cent. Secondary revenue comes from interest on customer cash balances, data and API licensing, partnerships, and withdrawal fees on some payment methods.
Does Kalshi take a cut of winnings?
No. Fees are charged at the time you buy or sell a contract, not when it settles. If you hold a contract to resolution and it pays $1.00, you receive the full dollar with no additional fee deducted at settlement.
What is Kalshi's fee formula?
The taker fee is calculated as: round up to nearest cent (0.07 × C × P × (1 − P)), where C is the number of contracts and P is the price in dollars. A maker fee applies on some markets using a 0.0175 multiplier instead of 0.07. Fees are highest when the contract price is near $0.50 and taper toward $0.01 or $0.99.
Does Kalshi take the other side of my trade?
No. Kalshi is a pure exchange. When you buy a Yes contract, another trader on the platform is selling it. Kalshi facilitates the match and charges both parties a fee, but holds no position in the outcome itself. This is fundamentally different from a sportsbook, which takes the other side of your wager.
How much revenue does Kalshi generate?
Kalshi is privately held and does not publish audited financials. Industry estimates place 2025 fee revenue at approximately $260 million, up from around $24 million in 2024 and around $1.8 million in 2023. Annualised revenue was estimated at $600 to $700 million by late 2025.
What percentage of Kalshi's revenue comes from sports?
Sports contracts accounted for approximately 89% of Kalshi's estimated 2025 fee revenue. This concentration is why many state attorneys general argue that Kalshi is substantively a sports betting platform operating under a federal financial licence, even though Kalshi operates as a CFTC-regulated exchange.
Does Kalshi charge fees on perpetual futures?
Kalshi launched its perpetual futures product with zero trading fees to build initial liquidity. The zero-fee phase means perps volume generates minimal fee revenue for now. When Kalshi turns on fees for perpetuals, it represents an additional monetisation stream.
