How MEV bots make multimillion-dollar profits from attacks

MEV bots, or Miner Extractable Value bots, are automated trading algorithms that exploit price differences between various decentralized finance (defi) protocols to generate profit. These bots operate by executing trades ahead of larger transactions, known as “sandwiching” or “frontrunning,” and manipulating transaction fees to gain a higher position in the block.


MEV (Minimum Economic Value) bots employ sophisticated trading techniques like front-running and sandwich attacks to yield financial gains from cryptocurrency trades on exchanges. These automated systems function by closely monitoring market data in real-time, identifying profitable opportunities for arbitrage or liquidity provision, and executing trades swiftly to maximize their profit margins.

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As a blockchain analyst, I’ve observed that the growing adoption of smart contract applications presents new opportunities for income generation. These opportunities can stem from exploiting market inefficiencies and distinct architectural features of Ethereum and other blockchain networks. For instance, one could identify and capitalize on price discrepancies between markets or take advantage of specific smart contract design vulnerabilities to earn profits. However, it’s essential to remember that such activities may raise ethical concerns, as they can potentially manipulate market prices or exploit security weaknesses in the system. Always ensure you are operating within the bounds of legal and ethical guidelines when exploring these opportunities.

As a crypto investor, I’ve come across an intriguing concept known as Miner Extractable Value (MEV). In simpler terms, this is a way for miners to generate additional profits beyond just the block rewards and transaction fees. They can do so by strategically including, excluding, or reordering transactions in the blocks they mine. Essentially, they can take advantage of price differences between various transactions in the same block, creating arbitrage opportunities that result in extra gains for themselves.

As a researcher studying cybersecurity threats, I’ve observed an alarming trend. Over the years, adversaries have been exploiting sophisticated technology to launch attacks against different cryptocurrency protocols with the ultimate goal of stealing digital assets. The question is, how exactly do they manage to bypass security measures and achieve their nefarious objectives?

What are MEV bots, and how do they work?

On the Ethereum blockchain, MEV (Minimum Value Extracted) refers to a tactic used by validators to maximize their earnings. By manipulating the sequence of transactions within a block, they can personally benefit at the expense of other users, resulting in unintended losses for those affected.

As a researcher in the field of blockchain technology, I’ve discovered that transaction priority and gas fees play significant roles in determining the network’s efficiency. In particular, on Ethereum and Solana, two prominent blockchain platforms, validator pools are utilized to validate transactions. Should users wish to expedite their own transactions, they can do so by paying higher fees.

Yet, this method has given birth to MEV bots, entities that capitalize on users’ transactions for maximal gains. Their influence is palpable in the ongoing gas fee controversy, most notably on Ethereum and Solana.

In both the Ethereum and Solana communities, there is ongoing discussion about the continuous risk posed by MEV bots and the challenges in effectively combating them. Ethereum programmers are actively exploring potential remedies at the protocol level; however, a definitive solution has yet to be achieved.

How MEV bots make a profit

As a blockchain analyst, I can explain that MEVs, or Miner Extractable Value, function as sophisticated bots that scan the blockchain for profitable opportunities. They engage in various strategies such as arbitrage, where they identify price differences between markets and exploit them; frontrunning, where they execute trades ahead of others to capture profits; and transaction fee manipulation, where they strategically place transactions with high fees to maximize their revenue.

As a crypto investor, I frequently come across opportunities to profit from price discrepancies between various exchanges through arbitrage. Utilizing MEV bots, I can efficiently capitalize on these differences by executing simultaneous buy and sell transactions on different platforms. This strategy, known as arbitrage, is a popular method for extracting maximum extraneous value (MEV) in the decentralized finance landscape.

During the process of frontrunning, MEV bots keep an eye on the mempool to identify transactions that are about to be added to the next block. Subsequently, they execute their own transactions, strategically placing them before or after these identified ones. This tactic allows MEV bots to gain an edge over other traders in terms of transaction execution. At times, multiple transactions are bundled together, resulting in what’s known as a sandwich attack.

As an analyst, I’d describe it this way: When I observe a forthcoming transaction intending to buy a large quantity of tokens, I seize the opportunity and execute a sell order for those same tokens beforehand. This strategic maneuver enables me to capitalize on the expected price hike following the initial purchase.

As a market analyst specializing in decentralized finance (DeFi), I closely observe the activities of automated market-making (AMM) bots, specifically those focused on liquidations within DeFi borrowing and lending platforms such as Aave. By keeping a vigilant eye out for loans that may become underfunded before they are officially liquidated, these bots act proactively. They submit strategic bids in anticipation of price fluctuations, aiming to profit from subsequent market movements.

Bots can adjust transaction fees to improve their placement in trades, which might disadvantage other market participants. They amassed approximately $313.7 million in profits during the 2021-2023 period, based on Dune Analytics’ findings.

MEV bots and blockchain protocols ravage

In September 2022, an unauthorized intrusion into an arbitrage bot identified as 0xbad led to the theft of approximately 1,100 Ether. Sadly, numerous users of this bot had their funds compromised during this cyberattack.

As a researcher examining the case of our highly profitable MEV bot, I’ve uncovered an incident where it incurred significant losses totaling 1,101 ETH, equivalent to approximately $1.45 million, in the transaction with the hash: [TX-HASH]. The cause of these losses remains under investigation.— PeckShield Inc. (@peckshield) September 27, 2022

In October 2023, a MEV (Minimum Evitable Value) bot on the Binance Smart Chain (BNB Chain) generated a revenue of approximately $1.575 million by executing a Flash Lending assault on the BH/USDT trading pair on PancakeSwap. Notably, this profitable operation incurred minimal expenses, amounting to just $4.16 for arbitration fees. This marked the most substantial gain from such activities ever recorded in the history of the BNB Chain.

As a crypto investor following the latest developments on the BNB Chain, I’ve come across an interesting finding from EigenPhi. On October 11, an entity known as MEV Bot: 0x21…480C executed a flash loan attack on the PancakeSwap BH/USDT trading pair, raking in a massive profit of approximately US$1.575 million with just a $4.16 investment. This marks the largest single arbitrage profit ever recorded on the BNB Chain.— Wu Blockchain (@WuBlockchain) October 12, 2023

In November 2023, an arbitration bot operating on the Curve Finance platform was breached, resulting in a monetary loss of approximately $2 million.

As an analyst, I’d interpret Beosin’s findings this way: The attacker exploited the unauthorized access to the 0xf6ebebb function, which allowed for pool swaps, to execute an instant loan of approximately 27,255 WETH, equivalent to over $51 million at the time. By manipulating the price balance within the WETH/WBTC pool, they carried out a profitable arbitrage transaction using a bot.

An unidentified MEV (Minimal Exchange Value) bot incurred approximately $2 million in losses due to a security breach. The issue stemmed from the fact that the arbitrage function 0xf6ebebbb was not secured with authentication measures, enabling an attacker to manipulate it and trigger swaps between various pools, leading to substantial financial discrepancies.

— Beosin Alert (@BeosinAlert) November 8, 2023

In April, the MEV bot collective suffered a significant loss of over $25.38 million due to a cyberattack on the Ethereum blockchain. The attacker managed to infiltrate multiple bots within the group and substituted their intended transactions with malicious ones instead.

As a researcher investigating the recent #CertiKSkynetAlert, I’ve discovered that several MEV (Minimum Excellent Value) bots were exploited in an Ethereum block transaction. These bots were carrying out sandwich trades, a strategy where they initially swap large amounts of tokens for a smaller amount. However, the reverse transactions, which should follow these trades, were maliciously replaced by a validator, resulting in profit for the attacker.

— CertiK Alert (@CertiKAlert) April 3, 2023

A hacker devised a scheme using phony transactions to attract the attention of Automated Market Making (AMM) bots. Subsequently, he swapped the initial transactions with harmful ones, enabling him to pilfer funds in the process. The attacker prepared for the assault by depositing 32 ETH into the account.

How to deal with MEV bots

As a researcher studying the effects of MEV bots on transactions in decentralized finance (DeFi) platforms, I’ve discovered that proactively taking measures can help minimize their impact on your transactions. One effective strategy is to examine the fees before initiating a request and opt for DeFi platforms equipped with built-in MEV protection or dedicated tools designed specifically to shield users from these bots.

UniswapX, 1inch, and PancakeSwap are trading platforms that employ techniques to minimize bot manipulation. Users can adjust slippage tolerance on these sites by setting a minimum acceptable amount of tokens they’re willing to accept during price fluctuations.

Why it’s still worth considering MEV bots 

In contrast to conventional finance, making profits through MEV trading mainly takes place in an unregulated setting. Practices like frontrunning and other MEV strategies, while questionable from an ethical standpoint, are not strictly illegal as they are in traditional stock markets due to the openness of information regarding pending orders on the blockchain.

Operators of MEV (Minimum Value Extracted) bots stand to make significant profits. However, these bots carry the risk of being utilized for market manipulation activities. Such practices cast doubts on the integrity and equitability of the decentralized finance (DeFi) landscape.

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2024-06-14 18:18