When trading on decentralized exchanges (DEXs), slippage tolerance is a critical parameter you must understand. Incorrect settings can cause transactions to fail or leave you vulnerable to MEV bot attacks. This article explains what slippage is, how to set it, and best practices for different scenarios. If you are not yet familiar with DEX operations, it is recommended to practice first on a centralized exchange like Binance.
What Is Slippage?
Slippage refers to the difference between the expected price of a trade and the actual execution price. On a DEX, from the moment you initiate a trade to when it is confirmed on the blockchain, the price may change, resulting in a different amount of tokens than expected.
Causes of slippage:
- Price volatility: Market prices can shift during the seconds to minutes it takes for a transaction to be confirmed
- Insufficient liquidity depth: If the pool lacks sufficient liquidity, large trades will have a greater price impact
- Front-running: Other users or bots may have their transactions confirmed before yours, changing the pool price
What Does Slippage Tolerance Mean?
Slippage tolerance is the maximum percentage of price deviation you are willing to accept. If actual slippage exceeds your set tolerance, the transaction will automatically fail and revert, protecting you from executing at an unfavorable price.
For example, if you set slippage tolerance to 1%:
- You expect to receive 100 tokens
- The trade will only succeed if you receive at least 99 tokens
- If you would only receive 98 tokens (2% slippage), the trade automatically fails
Recommended Slippage Settings for Different Scenarios
Major Token Trades
Trading ETH, BNB, USDT, and other major tokens with deep liquidity:
- Recommended slippage: 0.1% - 0.5%
- Explanation: Major tokens have deep liquidity, so slippage is normally very low
Stablecoin Swaps
Swapping between USDT and USDC, where prices barely change:
- Recommended slippage: 0.05% - 0.1%
- Explanation: Stablecoin prices are stable and do not require high slippage
Mid-Cap Tokens
Tokens with moderate liquidity:
- Recommended slippage: 1% - 3%
- Explanation: More room is needed for price fluctuations
Small-Cap and New Tokens
Tokens with low liquidity and high volatility:
- Recommended slippage: 3% - 5%
- Explanation: Low-liquidity tokens experience greater price impact and require higher slippage
Tokens with Transaction Taxes
Many meme coins and DeFi tokens have built-in transaction taxes:
- Recommended slippage: Tax rate + 1-2%
- Explanation: If a token has a 5% transaction tax, you need to set at least 6-7% slippage
How to Set Slippage on Uniswap
- Open the Uniswap Swap page
- Click the gear icon (Settings) in the upper right corner
- Under "Slippage tolerance," choose:
- Auto: System-recommended (typically 0.5%)
- Manual: Enter your desired percentage
- Once set, proceed with your trade
How to Set Slippage on PancakeSwap
- Open the PancakeSwap Swap page
- Click the gear icon on the trading interface
- Enter your desired percentage under "Slippage Tolerance"
- You can also select preset options of 0.1%, 0.5%, or 1%
- Click outside the settings panel to close it
What Happens If Slippage Is Set Too High or Too Low?
Problems with Slippage Set Too Low
- Transactions frequently fail, wasting gas fees
- Especially during network congestion, low slippage trades are nearly impossible to execute
- For tokens with transaction taxes, slippage lower than the tax rate will always fail
Risks of Slippage Set Too High
- Sandwich attacks: MEV bots monitor on-chain transactions with high slippage, buy ahead of you to push the price up, then sell after your purchase for a profit
- Poor execution price: You may end up trading at a price far worse than expected
- Unnecessary losses: If a trade could execute at 0.5% slippage, setting it to 10% means you are voluntarily accepting the worst possible price
How to Protect Against Slippage Attacks
MEV (Maximal Extractable Value) attacks are a serious threat to DEX users. Here are some protective measures:
- Do not set excessively high slippage: Only set the minimum necessary slippage
- Use MEV protection: DEXs like Uniswap have built-in MEV protection features; make sure they are enabled
- Use private transactions: Submit private transactions through services like Flashbots Protect to avoid detection by MEV bots
- Split large trades: Break large trades into multiple smaller ones to reduce price impact
- Trade during off-peak hours: Network congestion is lower, gas fees are cheaper, and the probability of attacks is reduced
Safety Reminders
Proper slippage settings are directly tied to the security of your funds when trading on DEXs:
- Check slippage before every trade: Different tokens require different slippage settings; do not use a fixed value for everything
- Watch the Price Impact: If the price impact exceeds 5%, consider reducing your trade size or switching to a deeper pool
- Be wary of high-slippage tokens: Tokens that require more than 10% slippage to trade are likely problematic (honeypots or excessively high transaction taxes)
- Verify the token contract: Before setting high slippage, confirm the token contract address is correct and not a scam
- Use limit orders: Some DEX aggregators like 1inch support limit order functionality, which avoids slippage entirely
- Research before trading: Avoid impulsive trades. You can first download the official Binance app (iPhone users can refer to the iOS installation guide) to check whether the token is listed on centralized exchanges
What Is the Difference Between Slippage and Price Impact?
Slippage is the deviation caused by price changes during the time your transaction waits for confirmation; it is uncontrollable. Price impact is the effect your trade itself has on the pool price, which depends on your trade size and liquidity depth and is predictable.
What Should I Do If I See "Price Impact Too High"?
This means your trade size is too large relative to the liquidity pool. You can reduce your trade amount, split it into multiple trades, or find a pool with deeper liquidity (for example, using 1inch to aggregate liquidity across multiple DEXs).
Why Does My Transaction Keep Failing?
The most common reason is that slippage is set too low. Other causes include insufficient gas fees, transfer restrictions in the token contract, or the token being a honeypot (you can buy but cannot sell).
Will I Still Pay Gas Fees If a DEX Trade Fails?
Yes. A failed transaction still consumes gas because the miners have already processed your transaction request. This is a cost to keep in mind when trading on DEXs.
Is There a Way to Trade Without Setting Slippage?
Some DEX aggregators offer limit order functionality, where you set a desired execution price and the trade only executes when that price is reached. Protocols like CoW Swap also reduce slippage through batch auction mechanisms.