What is slippage in Kalshi: definition for traders
Slippage is the difference between the price you expect and the price you actually get when an order fills. On Kalshi, slippage most often appears when order size, market liquidity, or fast price moves force fills at worse prices. Traders in prediction markets watch slippage because it turns theoretical profit into realized loss. PolyArb helps arbitrage traders by using low latency and guaranteed edge mechanics to reduce the impact of slippage on short-lived spreads.
What slippage means in prediction markets
Slippage is simply execution slippage: market impact plus the mismatch between order routing and current quotes. In thin markets, a market or large limit order consumes multiple price levels so your average fill is worse than the visible best ask or bid. Slippage also happens during rapid news or when many participants hit the same side at once.
How Kalshi’s structure affects slippage
Kalshi is an exchange for event contracts; like any order book, its liquidity depth determines slippage. Contracts with low open interest or wide spreads show higher slippage for aggressive orders. Limit orders reduce slippage risk but may not fill; market orders (or FAK equivalents) guarantee immediate execution at the cost of moving through the book.
Comparing Kalshi slippage to Polymarket
Polymarket runs a Central Limit Order Book on Polygon with tick-size rules and gasless relayer execution. Slippage mechanics are the same conceptually: shallow books and larger sizes worsen fills. Where PolyArb differs is operational: we target intra-market arbitrage on Polymarket, using 40ms latency, Telegram and Discord alerts, and a $7.62 minimum guaranteed edge to offset execution costs and typical slippage.
Practical ways traders manage slippage
Reduce order size or split it into smaller child orders to minimize market impact. Prefer limit orders at the midpoint or just inside the book when time allows. Use low-latency tools when speed matters; for arbitrage, faster execution lowers the chance the spread vanishes before your order fills. Remember settlement, resolution, and smart-contract risks can still affect realized outcomes.
Start reducing slippage with PolyArb today
Join PolyArb for $99/month to get 40ms latency, Telegram and Discord alerts, and a $7.62 minimum guaranteed edge on eligible arbitrage signals.
FAQ
- Is slippage the same as fees on Kalshi?
- No. Slippage is the execution price difference caused by market impact and book depth. Fees are explicit charges the venue applies. Both reduce net returns, but they are separate effects.
- Can I avoid slippage with limit orders?
- Limit orders can avoid adverse fills by specifying price, but they may not execute if the market moves away. That trade-off between execution certainty and price certainty is key in thin markets.
- Does PolyArb eliminate slippage?
- PolyArb does not eliminate slippage, but its low 40ms latency, non-custodial execution, and $7.62 minimum guaranteed edge are designed to reduce the net impact of slippage on arbitrage trades compared with slower, free bots.