If you've placed a trade on a decentralized exchange (DEX) and noticed receiving less than expected upon finalization, you may have encountered front running. This guide explains what front running is and how to avoid it effectively.
What Is Front Running?
Front running occurs when a trader exploits transaction ordering within a block to profit from others. Here’s how it works:
- Exploiting Transaction Order: A front runner places buy/sell orders around the target’s transaction.
- Priority Gas Auctions (PGA): Bots bid higher gas fees to prioritize their transactions.
- Profit Extraction: The front runner buys low before the target’s order and sells high afterward.
👉 Learn how to protect your trades from front runners
Why It Matters: Front running bots operate at millisecond speeds, making manual competition impossible. Ethereum-based DEXs like Uniswap and Balancer are frequent targets.
4 Strategies to Avoid Front Runners
1. Avoid Low-Liquidity Pools
- Risk: Low liquidity amplifies price impact, attracting front runners.
- Solution: Trade in high-liquidity pools to reduce vulnerability.
2. Set Low Slippage Tolerance
- Recommended Slippage: 0.5%–2%.
- Why: High slippage allows front runners to exploit price gaps.
👉 Discover secure trading practices
3. Overpay on Gas Fees
- Action: Use "fast" gas options or manually increase gas prices.
- Result: Faster transaction processing reduces front-runner reaction time.
4. Place Smaller Orders
- Threshold: Orders under $1,000 are less profitable for front runners.
- Reason: Gas fees ($50+ for two transactions) outweigh gains on small trades.
FAQ
Q1: Will Ethereum 2.0 eliminate front running?
A: No. Proof-of-stake (PoS) still allows validators to prioritize transactions, though technical barriers may increase.
Q2: How do front runners identify targets?
A: They scan the mempool for large, high-slippage orders in low-liquidity pools.
Q3: Are cross-chain AMMs safe?
A: Front running is emerging on cross-chain platforms—apply the same precautions.