$50 million instantly evaporated into $36,000: DeFi risks lurk in the minutiae
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$50 million instantly evaporated into $36,000: DeFi risks lurk in the minutiae
How Should DeFi Strike a Balance Between Permissionless Access and User Protection?
Navigating Web3 tides with focused insightsBy: 1inch
Translated by: AididiaoJP, Foresight News
Receiving a quote is merely the first step in verifying a transaction.
This was the sobering lesson delivered by the Aave and CoW Swap incident on March 12—when a user sent $50,432,688 for a swap and ultimately received only $36,000.
Yet this incident also raises another point worthy of deeper reflection.
Security in DeFi does not contradict self-custody. Beneficial friction—that which preserves user control while prompting careful consideration—is one of the key enablers for scaling permissionless finance.
Price Impact Is Not Slippage
These two concepts are often conflated—and such confusion can have serious consequences.
Slippage refers to the difference between the quoted price you receive and the actual execution price. It arises from market volatility: conditions may shift between the time you request a quote and when the trade executes. Slippage can catch you off guard.
Price impact, however, is different—it stems from the size of your own order. When you buy a large amount of an asset against thin liquidity, you sequentially exhaust available supply across price levels, pushing the price against you during execution. The quoted price already reflects this impact.
According to information from CoW Swap and Aave, in the March 12 incident, the user’s quote displayed a 99.9% price impact before confirmation. The interface showed a warning, and the swap button remained grayed out and disabled until the user checked a confirmation box acknowledging potential 100% value loss.
The market did not act against the user. Rather, the order size was simply too large for existing liquidity to absorb at or near fair market value—and the quote explicitly reflected this reality.
Essential Checks Before Executing Large Swaps
When a swap interface returns a quote, it only indicates that a viable trading path has been found—not that the trade is economically sound.
Before confirming any large swap, always:
- Compare the expected amount of the output asset against its current market price.
- Take price impact warnings seriously. 99.9% is not a rounding error.
- For large trades, consider splitting the order or executing over-the-counter (OTC), which may yield significantly better execution.
How 1inch Handles Routing
On the 1inch platform, swaps are routed via the Pathfinder algorithm, which scans over 300 liquidity sources to identify the best feasible path. Pathfinder can split orders, route across multiple pools and chains, and optimize execution quality.
But it cannot conjure liquidity that does not exist.
If you query a swap on 1inch and receive no quote, it means Pathfinder could not find a viable trading path. This “no-quote” result itself is valuable information—it signals that current market conditions do not support a trade of that specific size.
If price impact exists, we issue a clear warning. When you see it, take it seriously.
Implications for the DeFi User Experience
Permissionlessness is foundational to DeFi—and must remain so. No one should need permission to manage their own assets.
Yet we must balance this principle through thoughtful, user-centric design.
People enter DeFi for many reasons. Early adopters were primarily motivated by decentralization ideals. But as the space matures, the range of user needs it must serve broadens considerably. If we truly believe in DeFi’s future, we should welcome users who join not for ideological alignment—but for tangible advantages.
The challenge lies in striking the right balance: how to deliver safer user experiences without compromising DeFi’s core principles.
In response to this incident, Aave launched Aave Shield (note: distinct from 1inch Shield, part of 1inch’s long-standing security framework). By default, Aave Shield blocks swaps with price impact exceeding 25%, though advanced users may override this limit in settings.
This is a fitting example: introducing meaningful “friction” before high-risk actions—while preserving every user’s right to proceed.
The goal of the DeFi user experience is not to prevent users from making choices—but to ensure those choices are made with full information and genuine opportunity to reconsider. Self-custody means users are in control. And that control delivers maximum value only when users clearly understand what they are confirming.
Mass adoption of DeFi will not be achieved by adding more restrictions—but by making it easier for users to understand the implications of their actions before they act. This is a UX problem—and a shared industry priority.
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