How a Minor 3% Price Shift Triggered a Massive $36 Million DeFi Liquidation Cascade

When a 3% Move Triggered $36M in Ethereum DeFi Liquidations

Let's walk through what actually happened and why this matters for anyone running leveraged positions on-chain.

The Mechanism Behind the Cascade

The collateral at the center of this event was PT-reUSD, a principal token issued on Pendle and tied to reUSD, a dollar-denominated interest-bearing asset. Pendle's design splits these positions into two pieces: the PT (principal token), redeemable at maturity, and the YT (yield token), which collects the interest earned before that date. In this case, PT-reUSD was set to mature on December 10, 2026.

Here's where things got interesting. According to blockchain security firm PeckShield, one wallet made a heavy purchase of YT-reUSD, pushing the implied annual yield up to around 20% before selling out shortly after. Because PT and YT are carved from the same underlying asset, when demand floods into the yield side, the principal side has to get cheaper to compensate. PT-reUSD fell roughly 3%.

That alone wouldn't normally matter. But borrowers on Morpho had deposited PT-reUSD as collateral and borrowed USDC against it — some running leveraged loops where they borrowed USDC, bought more PT-reUSD, and repeated the process. These positions were sitting on less than 3% of headroom before their loans would be automatically closed out.

What Actually Got Liquidated

When the price drop crossed the threshold, Morpho's liquidators moved fast. Between 04:37:47 and 04:51:23 UTC, 33 liquidation events fired, repaying $36.14 million of debt. The USDC market accounted for $35.19 million of that, while the USDT market saw $956,000. Liquidators seized 38.6 million principal tokens across all events.

At the time, the affected Morpho market held $67.5 million in collateral against $52.2 million in borrows. The Pendle reUSD pool, by comparison, had $8.97 million of liquidity — a reminder that these numbers measure different things (lending market depth vs. pool liquidity), so they're not directly comparable.

The Oracle Question

Morpho's liquidation calls relied on an oracle that took whichever value was lower: PT-reUSD's 15-minute average trading price, or a fixed schedule gradually climbing toward $1 at maturity. The fixed schedule acted as a cap, preventing the token from being valued above what its maturity path implied. When market price dipped below that curve, the 15-minute average became the lower number and took over.

The liquidation threshold sat at 91.5%, per Morpho market documentation. This construction meant a relatively small market move could push leveraged positions past the line. Pendle confirmed the oracle functioned as intended and was configured correctly.

What This Means for Your Positions

The good news: Steakhouse Financial reported that liquidation proceeds were enough to repay outstanding loans, and the market didn't suffer bad debt. So this wasn't a protocol insolvency — it was a leverage unwind.

The takeaway for us is straightforward. A 3% move in a yield instrument with thin headroom can trigger far more damage than a much larger move in a deeply liquid asset. The relevant question for leveraged borrowers isn't just "how far might this token fall?" but "how close am I already to forced liquidation?"

If you're running collateralized loops on Morpho or similar lending markets, check your loan-to-value ratio now. Positions running close to the threshold don't need a crash — they just need a nudge.