A Uniswap user lost $700,000 to an MEV bot — but it only made $260

Quick Take

  • A Uniswap v3 user tried to create a liquidity pool but seemingly entered the wrong value when doing so, losing $700,000 to trading bots in the process. 
  • The bot that was most heavily involved in the arbitrage paid $527,000 to the validator to fulfil the transaction and only made $260 from the trade.

A Uniswap V3 user who appears to have mistaken one token for another in creating a liquidity pool lost over $700,000 in 12 seconds to an MEV-related transaction this morning. 

It seems the user mistook the value of the Curve DAO token (CRV) for USD when they added $1.56 million worth of wrapped BTC to the liquidity pool. The user received 1.56 million CRV in return, however, which was only worth around $850,000 at the time.

MEV bots quickly rushed in to exploit the arbitrage, though the most successful only netted a total profit of around $260 after paying a $527,000 bribe to validators in order to 'frontrun' other bots and get its transaction through first, according to blockchain analytics firm Arkham. "Tough luck," Arkham's post added. 


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Mistakes in transactions, often referred to as "fat finger" errors, are not uncommon in crypto. Last month, a user swapped what had been over $130,000 in one stablecoin, USDR, for $0 worth of another stablecoin, USDC. 

© 2023 The Block. All Rights Reserved. This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.

About Author

Zack Abrams is a writer and editor based in Brooklyn, New York. Before coming to The Block, he was the Head Writer at Coinage, a Web3 media outlet covering the biggest stories in Web3. The story he co-reported on Do Kwon won a 2022 Best in Business Journalism award from SABEW. Other projects included a deep dive into SBF's defense based on exclusive documents and unveiling the identity of the hacker behind one of 2023's biggest crypto hacks — so far. He can be reached via X @zackdabrams or email, [email protected].


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