What is MEV or Maximal Extractable Value?


The blockchain landscape constantly evolves, with new concepts and strategies emerging regularly. One such concept that has gained prominence is - MEV or Maximal Extractable Value. This concept has become crucial to the blockchain ecosystem, influencing transaction order, miner profitability, and network stability. But what exactly is MEV, and why is it important in the blockchain ecosystem? This blog will delve into the intricacies of MEV, providing a detailed understanding of its workings, implications, and significance in the blockchain world.

What Is MEV?

Maximal Extractable Value (MEV) is a term used to describe a strategy employed by miners, validators, and searchers in the blockchain ecosystem to optimize their profitability. This is achieved by manipulating the order, inclusion, and exclusion of transactions in a block. While this can be profitable for these actors, it can also negatively affect users and networks.

The term MEV was initially known as "miner extractable value" in the context of Proof of Work (PoW) networks. However, with the transition of many networks, including Ethereum, from PoW to Proof of Stake (PoS), the term has evolved to mean "maximal extractable value."

The Evolution of MEV

The concept of MEV has been around for a while, but it gained prominence in 2021. Initially, MEV referred to the extra value that miners could extract from transaction fees and block rewards in a PoW network. This added value comes from ordering, including, and excluding transactions in a block.

However, with the shift from PoW to PoS in many networks, the tasks previously completed by miners are now performed by validators. As a result, the term MEV has evolved to mean "maximal extractable value," reflecting the broader range of actors who can extract value from transactions.

How Does MEV Work?

MEV allows block producers (miners or validators) to have full discretion over transactions' ordering, inclusion, and exclusion. They can manipulate the placement of transactions to optimize their return through various MEV strategies.

MEV Strategies

Block producers can use several strategies to maximize their profits. For instance, they can identify a large transaction that may impact the value of a specific cryptocurrency. They can profit from the expected price increase by placing orders directly in front of and behind that large transaction.

While these strategies can be profitable for block producers, they can also negatively affect other users and the network. These consequences include inflated gas fees, network congestion, and potential destabilization of the blockchain network.

What Are MEV Searchers?

MEV searchers are a crucial part of the MEV ecosystem. They are actors who look for extractable value on the blockchain, often paying high gas fees to extract maximum value from transactions.

MEV searchers review transactions and strategically group them in bundles. These bundles may also include other transactions in the mempool, and the bundled transactions can then be executed in a specific sequence for maximum profit.

MEV searchers often use complex algorithms and bots to identify profitable transactions and execute their strategies.

Examples of MEV

MEV searchers use a variety of strategies to extract value from the blockchain. These strategies are complex and require a deep understanding of the blockchain ecosystem. Here are some of the most common MEV strategies:

DEX Arbitrage

Decentralized exchange (DEX) arbitrage is one of the most common MEV strategies. In this strategy, bots monitor the prices of tokens on different exchanges. When they spot a price differential between exchanges, they buy the token at a lower price on one exchange and sell it at a higher price on another. This strategy requires high-speed bots and a deep understanding of the market.


Back-running is a strategy where a bot identifies a profitable transaction that is about to be executed. The bot then creates a similar transaction with a higher gas fee, ensuring it is executed first. This strategy is particularly effective when there is a limited token supply and high demand.


Front-running is a strategy where a bot identifies a large transaction that is about to be executed. The bot then creates a similar transaction with a higher gas fee, ensuring it is executed before the large transaction. This can allow the bot to profit from price movements caused by the large transaction.


In the liquidation strategy, MEV searchers and block producers identify high-risk leveraged positions on decentralized finance (DeFi) platforms. They then strategically liquidate these positions, paying off the lenders and taking a portion of the collateral as a fee. This strategy requires a deep understanding of DeFi platforms and the ability to identify and liquidate high-risk positions quickly.

Sandwich Trading

Sandwich trading is a complex strategy that involves two bots. The first bot identifies a large transaction and places a similar transaction with a higher gas fee, ensuring that its transaction is executed first. The second bot then places a similar transaction with an even higher gas fee, ensuring it is executed after the large transaction. This allows the bots to profit from the price movements caused by the large transaction.

Each of these strategies requires a deep understanding of the blockchain ecosystem and the ability to identify and execute profitable transactions quickly. However, they can also contribute to network congestion, high gas fees, and other issues, highlighting the need for solutions to the MEV problem.

Positives and Negatives of MEV

MEV, like many aspects of the blockchain ecosystem, has both positive and negative implications. Some of the key implications are —

Positives of MEV

Rewards for Miners and Validators: MEV provides additional rewards for miners and validators on top of the regular block rewards and transaction fees. This can incentivize them to maintain the network and secure its transactions.

Efficiency in the Market: MEV can lead to more efficient markets. For example, arbitrage opportunities, a common MEV source, help keep prices consistent across different platforms.

Innovation and Development: The potential profits from MEV have led to the developing of innovative strategies and technologies. For instance, the rise of MEVs has led to the creation of advanced bots and algorithms to identify and exploit MEV opportunities or mitigate MEV risk entirely.

Negatives of MEV

Network Instability: MEV can contribute to network instability. For example, miners might reorganize blocks to extract MEV, which can lead to chain reorganizations and double-spending attacks.

Increased Gas Fees: MEV can lead to increased gas fees. Bots competing for MEV opportunities often pay high gas fees to get their transactions included in the blockchain first, which can drive up gas fees for all users.

Inequality: MEV can contribute to inequality in the blockchain ecosystem. Large miners and validators with more resources can better exploit MEV opportunities, leading to a concentration of wealth and power.

Negative User Experience: High gas fees and network instability caused by MEV can lead to a negative user experience. Transactions might take longer to be confirmed or dropped entirely if higher gas fees outbid them.

Centralization: MEV can lead to centralization, as larger miners and validators with more resources can better exploit MEV opportunities. This goes against the decentralized ethos of blockchain.

Closing Thoughts

MEV is a complex and multifaceted concept that plays a crucial role in the blockchain ecosystem. While it can provide significant benefits to certain actors, it also presents challenges that need to be addressed to ensure the fairness and stability of the blockchain. As the blockchain space evolves, it will be interesting to see how the MEV concept develops and its challenges are addressed.

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