What is MEV? Maximal Extractable Value on Ethereum

Although the normal process of MEV participants is to select transactions with higher fees, some users can change transaction settings for their own profit. On blockchains that support smart contracts (like Ethereum), more complex transactions—such as lending, borrowing, liquidations, or trading—provide extra opportunities for block producers to extract value beyond standard fees. When a user submits a transaction, the transaction goes to the mempool of every node in the network. The block producers can decide to include, exclude, or reorder the transactions within the next block.

Due to MEV extraction strategies, users may experience higher gas fees and potentially unfavorable trades. At the heart of blockchain networks lies the fundamental concept of block production. In Proof of Work (PoW) systems like Bitcoin, miners essentially act as gatekeepers that secure the network and earn rewards by validating transactions and bundling them into blocks.

An introduction to maximal extractable value on Ethereum

For example, if there’s a popular NFT drop and a searcher wants a certain NFT or set of NFTs, they can program a transaction such that they are the first in line to buy the NFT, or they can buy the entire set of NFTs in a single transaction. Or if an NFT is mistakenly listed at a low priceopens in a new tab, a searcher can frontrun other purchasers and snap it up for cheap. You can verify the transaction was confirmed on a block explorer (like Etherscan or beaconch.in) by looking up the address the transaction was sent from. We bring the world together to solve the mysteries of how to buy and sell bitcoins matter, energy, space and time.

Suppose Trader A sees a waiting order and knows that Trader B is willing to tolerate a slippage of 1%. In that case, Trader A can purchase the asset up to the maximum price that Trader B is willing to tolerate. Subsequently, Trader A can sell the asset immediately after Trader B buys it for a 1% higher price, resulting in a profit. Slippage is a measure of how much the price of an asset in a liquidity pool can fluctuate due to a trade.

Here, a validator connected to a relay asks for available execution payloads and uses MEV Boost’s ordering algorithm to select the payload header with the highest bid + MEV tips.
However, from the perspective of traditional finance (TradFi), it would be considered insider trading and, therefore, illegal.
It’s also a big source of frustration, as many DEXs will end up with huge divergence between the price they quote and the price you get.
Investopedia describes front-running as “trading stock or any other financial asset by a broker who has inside knowledge of a future transaction that is about to affect its price substantially”.
Additionally, if there is any MEV generated from the transaction, you get up to 90% of it back through MEV-Share.

Effects of MEV on DeFi Users

“Miner Extracted Value” was the original term used to describe this concept, but was deprecated partly because of Ethereum’s switch to Proof-of-Stake, where validators staking coins–not miners solving proof-of-work problems–produce blocks. To mitigate these risks, Ethereum researchers are exploring solutions like Proposer-Builder Separation (PBS), which would separate block-building responsibilities from validators, reducing their direct influence over MEV extraction. The MEV bot detects that a user intends to buy a token and inserts a transaction before to purchase at a lower price than the user. It then queues a sell transaction after the user’s transaction, earning a profit of 0.02 ETH. Sandwiching is a form of web3 market manipulation prevalent within DeFi ecosystems. The searcher will jump ahead of the target’s large purchase order, which raises the price.

Scallop: The Future of DeFi on Sui

In this attack, bots are used to instantly purchase low on an exchange and sell high on another, thereby allowing the trader to make a profit from the price difference. By reordering or selectively including transactions, a block producer could trigger profitable arbitrage trades or gain from on-chain liquidations. This process of optimizing transaction ordering for extra financial gain is the essence of MEV. Originally it stood for “miner extractable value”, but the term was later expanded to include other blockchain actors like validators that can influence transaction order. MEV capitalizes on inherent latencies in blockchains and the competition among transactions for inclusion in new blocks. When a user sends a transaction, it is broadcast to the blockchain network and waits in the “mempool” for confirmation.

However, it’s important to note that private relays don’t offer complete protection against MEV, as other factors can still influence transaction outcomes. This profit is essentially an arbitrage opportunity realized by capitalizing on the knowledge of your pending transaction. They leveraged the time difference between transaction initiation and confirmation to their advantage, often at the expense of regular users like you, who face bad trade exeuction in their trades. Transactions in blockchain networks are broadcast to a mempool before they are added to a block, and a validator chooses a transaction to be included in the next block.

Liquidity in DeFi

MEV is also not unique to Ethereum, and as opportunities become more competitive on Ethereum, searchers are moving to alternate blockchains like Binance Smart Chain, where similar MEV opportunities as those on Ethereum exist with less competition. Rather than programming complex algorithms to detect profitable MEV opportunities, some searchers run generalized frontrunners. Generalized frontrunners are bots that watch the mempool to detect profitable transactions. The frontrunner will copy the potentially trade bitcoin cash in uk profitable transaction’s code, replace addresses with the frontrunner’s address, and run the transaction locally to double-check that the modified transaction results in a profit to the frontrunner’s address.

This dramatically increases the cost of censoring users and discourages the practice. However, since NFT transactions happen on the same blockchain shared by all other Ethereum transactions, searchers can use similar techniques as those used in traditional MEV opportunities in the NFT market too. It raises concerns about fairness, transparency, and security in transaction processing. Traders aim to quickly submit their transactions to front-run other traders when transactions can be ordered. MEV sparks several ethical debates, mainly centered around fairness and accessibility.

What is MEV?

When a user initiates a blockchain transaction, such as transferring tokens or executing a function on a smart contract, they specify details like the recipient’s address, transaction fee, and some arbitrary data. This transaction is then broadcasted to the blockchain network via a node (like QuickNode), where the network node validates its basic parameters. Upon validation, the transaction enters the node’s mempool, a holding area for all unconfirmed transactions, and the node begins broadcasting that transaction to a subset of its peers. Arbitrage is simply leveraging the different prices of an asset across several exchanges.

Liquidity pools and LP tokens

This is thanks to the rise of MEV-resistant protocols like UniswapX and MEV-enhanced liquid staking protocols like Jito that share MEV yield opportunities. When two validators produce a block at the same blockheight, the first gets added to the main chain and becomes a canonical block, while the other is left behind as an “uncle”. Uncle blocks are not completely discarded; instead, they receive a smaller portion of the block reward, and a reference to the uncled block is included in the main chain. The distinction between maximal and miner first arose when Ethereum merged to Proof-of-Stake. Before, miners would be the ones who order trades into a block, but now that’s done by staking validators. The old acronym no longer makes sense as miners aren’t involved in validation anymore.

This seemingly minor ability has led to an entire industry of automated bots and searchers who aggressively hunt for MEV opportunities. MEV smoothing could force the community to have more conversations around what types of MEV are acceptable. In a PBS world, the proposer will be incentivized to accept the maximum bid from a builder.

This affects node runners since they must invest in higher bandwidth to keep up with the message overhead.
That’s because MEV usually happens behind the scenes in the form of arbitrage, liquidations and other ways which we’ll cover below, but it is only when a user experiences extreme slippage on a larger trade that they begin to learn that MEV exists.
The core benefit of the Builder API is its potential to democratize access to MEV opportunities.
In decentralized finance (DeFi), this ordering can lead to slippage, where the actual trade price differs from the expected price.
For instance, ordering transactions in a certain way can result in on-chain liquidation or arbitrage opportunities, resulting in extra profit besides transaction fees and block rewards.

How high the MEV victim will end up paying depends on the “slippage” they’ve entered – the percentage price difference they’re willing to accept between the time of trade order and execution. The activity was first predicted in 2014 by an algorithmic trader under the pseudonym Pmcgoohan, who warned that miners could quietly rearrange transactions in a mempool for how to buy pepe crypto personal gain. The core benefit of the Builder API is its potential to democratize access to MEV opportunities. Using commit-reveal schemes eliminates trust assumptions and reduces entry barriers for validators seeking to benefit from MEV. This should reduce the pressure on solo stakers to integrate with large staking pools in order to boost MEV profits.