News 
March 13, 2025 
3 min. 
A cryptocurrency trader lost over $200,000 in a single transaction on the Uniswap V3 platform after mistakenly swapping approximately 220,000 USDC for just 5,000 USDT. The operation, carried out on March 11, shocked investors by highlighting the risks associated with improper use of decentralized exchanges (DEXs), particularly when configuring “slippage” incorrectly.
Slippage refers to the maximum price variation a user is willing to tolerate when executing a trade. If this setting is too high, the transaction may be completed at a much worse rate than expected, leading to significant financial losses.
Potential Causes Behind the Trader’s Loss
According to preliminary analyses, three main factors likely contributed to this massive discrepancy in the trade:
- Failure to Use a Price Aggregator Price aggregators, such as CowSwap, automatically scan multiple liquidity sources to find the best exchange rate for a trade. By choosing to execute the transaction directly on Uniswap V3 without consulting other platforms, the trader missed out on potentially better pricing.
- Incorrect Slippage Configuration On decentralized exchanges like Uniswap, users must define the maximum percentage of price variation they are willing to accept. If this parameter is set too high, the trade may go through at an extremely unfavorable rate. Experts believe the trader may have inadvertently allowed an excessively high slippage percentage, leading to this drastic loss.
- Potential Oracle Error An “oracle error” occurs when an external data provider feeds incorrect price information to a blockchain platform. If the trader relied on faulty data, they may have been misled into executing the swap at an unfavorable rate. To prevent such issues, experts recommend using price aggregators like CowSwap, which provide more accurate market rates and better transaction terms.
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This case underscores the importance of continuous education for users of decentralized exchanges, particularly when dealing with large sums of money. Additionally, it highlights the need for meticulous verification before confirming a transaction, as blockchain operations are irreversible.
