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  1. Home
  2. /Glossary
  3. /Front-Running
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defi

Front-Running

Placing a transaction ahead of someone else's known pending trade to profit from the price impact.

Definition

Placing a transaction ahead of someone else's known pending trade to profit from the price impact. On blockchains, bots watch the mempool for large trades and pay higher gas to get their transaction processed first. It's a form of MEV extraction that costs regular users money on every swap.

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Related Terms

MEV (Maximal Extractable Value)

Profit that block producers can extract by reordering, inserting, or censoring transactions.

Sandwich Attack

An MEV strategy where a bot places a buy order right before your swap and a sell order right after, profiting from the price impact your trade creates.

Mempool

The waiting room for unconfirmed transactions before they're included in a block.

1inch

A DEX aggregator that splits trades across multiple decentralized exchanges to find the best overall price.

Aave

One of the biggest lending and borrowing protocols in DeFi.

Across Protocol

A cross-chain bridge that uses an optimistic verification system and a network of relayers to move tokens between chains quickly.

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