July 7, 2026
by Emma Harrison
Slippage is not something you usually hear as you work on prediction markets. This concept may catch you off guard, but it is a rare concept that actually means the difference between the contract price and what you eventually paid.
This difference can happen to anyone, and it tends to occur when you least expect it. On this page, we’ll explain what slippage really means, why it happens at a prediction market, and steps to take to reduce it so it doesn’t affect your potential returns. If you’re interested in knowing more, please read this page to the very end.
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What does slippage mean in prediction market trading?
It’s the gap between your expected execution price and the actual execution price. This often occurs, in a small or large way, when you purchase an event contract on any prediction market. For instance, let’s say you decided to trade a World Cup event contract at one of our recommended CFTC prediction markets.
You found a YES contract at $0.60, and you decided to buy $5,000 worth of it. But due to certain reasons (which we’ll discuss soon), by the time your order fully executes, the final average price of the event contracts you purchased is $0.65 per share. That $0.05 difference is your slippage. So, instead of getting about 8,333 YES shares ($5,000/0.60), slippage has reduced the amount to ~7,692 YES shares purchased ($5,000/0.65).
So, does slippage affect your probability? Rightly so. Let’s say the contract event’s outcome you purchased went in your favor, each YES share will resolve to $1. Without slippage, you should get around $8,333 worth, taking home a profit of $3,333. That’s a huge difference that changes what you expect to get and what you actually receive.
But with slippage, you get $7,692, and your profit margin reduces to $2,692 ($7,692 – $5,000). It may seem small if you’re a low-volume trader, but if this happens on several consecutive trades, you’re not getting your full profit margin.
3 reasons why slippage happens in prediction markets
Slippage in prediction markets is no random occurrence. Three key factors drive it. Let’s take a look at them.
1. Liquidity
When a market is liquid, that means there are active traders on both sides (buyers and sellers). So, you’ll get your order matched quickly, even at your preferred price. But in a less-liquid market, your order will have to move through multiple price tiers, where other traders’ orders are, before it’s filled. And the average of these fill prices becomes slippage.
2. Order size
Like in any traditional financial market, small orders rarely move an event contract. A large purchase, however, can exhaust available orders at the current price, and continues to the next price level until it’s filled. The difference between the event contract prices at which your large purchase order starts to fill and at which it ends is slippage.
Some prediction market platforms use Automated Market Makers (AMM). These models use mathematical formulas to set the price of an event contract based on the size of your order relative to the available liquidity. So, the larger your order relative to the pool’s liquidity, the more the price moves against you and, thus, the more slippage you experience.
That’s why our recommended platforms use order books. For example, during our review of how does Kalshi work, we noticed that this operator uses a Central Limit Order Book (CLOB). This means you’re buying and selling event contracts directly against other traders, not an algorithmic liquidity pool.
While both CLOB and AMM models can have slippage, the latter does so more often, which can erode your profitability over time.
Can you reduce slippage?
Yes, you can. All you have to do is apply any of these approaches to your preferred prediction market platform.
💰 Split large positions into smaller chunks
Breaking up a large position into smaller orders can help reduce the price impact on individual trades. And when there’s less impact per trade, you experience less slippage. So, rather than buy $10,000 worth of YES shares at once, break it into five $2,000 or ten $1,000 orders. When taking this approach, you should consider your platform’s per-contract trading costs. For example, in our review of Kalshi fees, we found a maximum charge of $0.02 per contract. And this decreases with the more orders you place. So, splitting your large order isn’t a bad idea if your platform doesn’t charge you more for every purchase.
📈 Trade high-quality markets
Prediction markets focused on country elections, interest rates, award shows, and even international sports events often draw a large number of traders. And more participants mean more liquidity, which in turn leads to tighter spreads and cleaner order matching at every price level. Interestingly, top prediction market platforms let you filter markets by liquidity depth, which makes it easier to find event contracts that your trade won’t significantly affect their pricing.
🔒 Use limit orders and set slippage tolerance
These are some underrated features, especially if your prediction market platform offers them. Limit orders let you specify the price you’re willing to pay, which significantly caps your slippage. You can also set a maximum acceptable slippage percentage. If the trade exceeds your predefined thresholds, your order won’t be matched. No trade means you will get no slippage as well.
⏰ Time your entries
Markets see more activity and better liquidity when a major event is imminent or when relevant news is about to break. As such, trading during these peak periods can help reduce slippage. On the other hand, entering during quieter periods can lead to wider spreads, worse price fills, and greater slippage.
🛠️ Understand how your platform works
Understanding how your preferred platform works helps you know what prices are available before committing. For instance, during our review of how does Polymarket work, we noticed the platform uses a transparent peer-to-peer order book. Therefore, you trade directly with other users, not against the house, and you don’t need to wait for a complex mathematical formula to fetch the price for you. So, whenever you buy shares at your desired price, it reduces the chance of a surprise at execution.
Causes of slippage and solutions at a glance
Here’s an overview of the main causes of Slippage and how best to reduce it.
| Causes of slippage | What happens | How to reduce it |
| Thin liquidity | Limited contracts available at your target price | Stick to high-volume markets |
| Large order size | Order fills across multiple price tiers | Split trades into smaller sizes |
| Execution timing | Lag between initiating and completing a trade | Trade during peak activity windows |
How do these 3 recommended prediction market platforms handle slippage
Slippage exposure and management vary by platform. Here’s how Kalshi, Crypto.com, and Polymarket approach it.
Kalshi: Pros & Cons - Broad range of markets
- 24/7 live chat support
- Huge reputation
- Native mobile app
Kalshi is the first regulated prediction market in the US, operating under direct oversight of the Commodity Futures Trading Commission (CFTC). What makes this operator stand out is its order-book model while trading. You’ll see the bid and ask prices before you make any trade. This ensures price transparency at every step.
On Kalshi’s most active markets, such as sports, elections, interest rate decisions, and economic data releases, you’ll find liquidity to be deep. As such, the price you pay for getting the event contract is close to the value displayed in your preferred market. For US traders, it’s one of the most transparent starting points available.
Pros and Cons - Welcome bonus
- Broad range of markets
- High-performance mobile app
Crypto.com’s prediction market product sits inside a platform that millions of traders already know well. It covers crypto outcomes, global financial events, and sports markets, which is a natural extension for anyone already using the site.
Since the operator runs on crypto-native infrastructure, slippage can be a real concern for thinly traded or newly launched event contracts, where liquidity is lower. High-volume markets generally keep execution tight enough that slippage stays manageable for standard trade sizes.
Sponsored by Crypto.com – Not investment advice. Trading prediction markets and crypto involves risk, including potential loss of your stake. Consider your risk tolerance before participating. Crypto.com connects U.S. users to CDNA (regulated by CFTC) for derivatives trading. CDNA membership required. Trading may not be suitable for all—you could lose your entire investment plus fees. Past performance doesn’t guarantee future results. This is not a solicitation or recommendation to trade.
Polymarket: Pros and Cons - Numerous markets on sports, crypto, the economy, and politics
- Regulated by the CFTC
- Multiple rewards for existing traders
Polymarket is arguably the most recognized decentralized prediction market platform in the US. When it began operations, it ran on an AMM model, in which slippage was a built-in feature of every trade. Now, it has migrated to an off-chain order book, which significantly improves execution quality for active traders.
Polymarket’s largest markets, such as US elections, major sports outcomes, and global macro events, usually see substantial volume, keeping slippage tight for most standard-sized trades. It remains one of the most liquid prediction market platforms globally.
Here are some perks and notable drawbacks to note if you’re considering any of these operators.
Pros and Cons - Broad event coverage across politics, sports, economics, and entertainment
- Operate under CFTC regulation
- Prediction markets have enough liquidity to reduce slippage
- Newly launched event contracts can have high slippage
Sign up on these platforms and enjoy minimal slippage on highly liquid event contracts
Slippage may not be a common concept that not everyone knows about, but it can really pack a punch with a huge impact on your actual pay. It’s driven by many factors, such as thin liquidity, large order sizes, and your platform’s execution models. There are a few ways to reduce it as well, and sites such as Kalshi, Crypto.com, and Polymarket each handle price execution differently, giving you a chance to experience less slippage when making your first trade.
So, if you’re interested in exploring the prediction markets, tap the banners on this page to check each platform directly and see how well they perform.
Slippage in prediction markets FAQs
- 📈 What does slippage mean in trading?
Slippage is the gap between the price shown when you initiate a trade and the price at which your order actually executes. It’s caused by price movement during execution, your large orders filling across multiple price tiers, or a platform’s execution model.
- ⚠️ Does setting a slippage tolerance mean my trade might not go through?
Yes, if market movement exceeds your chosen tolerance before the trade completes, the order is canceled rather than filled at a worse price. Setting it too tight results in missed trades in fast-moving markets. Setting it too loose risks accepting larger gaps than necessary.
- 📉 Why does slippage get worse on some markets than others?
Low liquidity is the direct cause. A high-volume market has contracts available at tight price intervals, so large orders fill close to the target price. A thinly traded market has fewer contracts at any given price point. This forces orders to span wider price tiers and results in more slippage.
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