What is Front Running

Front running in cryptocurrency refers to a practice where a party with advance knowledge of a pending transaction exploits that information by executing their own transaction first profiting from the price movement the original transaction will cause. In decentralised finance, front running is primarily executed by automated bots monitoring the public mempool and has become one of the most technically complex and economically significant phenomena in blockchain.

HOW FRONT RUNNING WORKS IN DEFI

Every blockchain transaction spends time in the mempool a publicly visible waiting room where pending transactions sit before being included in a block. Miners and validators can see all pending transactions and select which ones to include. On Ethereum and other EVM chains, MEV (Maximal Extractable Value) bots continuously monitor the mempool for profitable opportunities.

THE SANDWICH ATTACK: THE MOST COMMON FORM

When your large swap transaction hits the mempool, a bot detects it will move the price on a DEX. The bot executes a front-run transaction (buying before yours, with a higher gas fee to get included first), waits for your transaction to execute and push the price up, then executes a back-run transaction (selling immediately after, profiting from the price you created). The bot extracts value directly from your transaction you receive worse execution than expected. This is the most prevalent form of retail trader harm from

MEV.THE SCALE OF MEV

MEV extraction has generated billions of dollars in profit since DeFi's emergence. MEV-Explore and Flashbots data shows hundreds of millions extracted annually from Ethereum users through various forms of sandwich attacks, liquidation competitions, and arbitrage.

PROTECTING YOUR TRANSACTIONS

Use DEX aggregators with MEV protection: CowSwap (batch auctions prevent sandwich attacks), 1inch Fusion (private order flow), and Flashbots Protect RPC (routes transactions through private mempool channels). Set conservative slippage tolerance very high slippage settings invite sandwich attacks. Use private RPCs for sensitive large trades. Split large trades into smaller amounts over time.

Terms in addition to the Front Running

Blockchain

A blockchain is a subset of a distributed database. The Bitcoin inventors originally prototyped the system in 2008. This modern database is made up of separate blocks that are connected together in a chronological chain. Blockchains may be used to store a wide range of data types. It has mostly been utilized as a public ledger for bitcoin transactions to date. A peer-to-peer network comprised of independent nodes uses a consensus process to ensure the blockchain's security and legitimacy. Each node in the network keeps a public and immutable copy of the data.

2 Factor Authentication (2FA)

2 Factor Authentication is a security measure with two layers. It is used by the majority of cryptocurrency exchanges. To log in, you must provide not only a password, but also a code obtained, for example, from the Google authenticator.

Airdrop

An airdrop is a method of distributing coins. End users can typically obtain coins for free or in exchange for doing a small task, such as subscribing to a newsletter, sending a tweet, or inviting others via a personal affiliate link. Cryptocurrency airdrops — the act of depositing cryptocurrency into public crypto wallets — are utilized as a marketing, liquidity creation, and network bootstrapping technique for many different types of blockchain initiatives.

Altcoin

Altcoin - "alternative coin" - is any kind of digital currency other than Bitcoin. Since the launch of Bitcoin, the world's first digital currency, many altcoins (as well as supporting blockchains) have been created. Altcoin digital currencies share many similarities to Bitcoin, but consistently and have significant differences. There are about 20,000 altcoins, and this number is expected to grow significantly in the coming years. Altcoins often develop Bitcoin features. Ethereum, currently the most widely used blockchain, supports digital contracts and separate applications where Bitcoin does not. Altcoins are also often created to cater to the needs of different users. The Litecoin blockchain, for example, can process payments quarterly for the duration of Bitcoin.

Cold Storage

Cold storage is the way to store cryptocurrency offline. The word refers to the use of offline wallets that are not connected to the internet. Cold storage is the most secure way to keep cryptocurrencies since an offline currency becomes less likely to be hacked and stolen. Paper wallets, printed renditions of private keys, and offline hardware and software wallets are all examples of cold storage.