Pendle's oracle worked; the market design didn't

The Defiant first reported that trades in a thinly traded Pendle yield market triggered $36.1 million of liquidations on Morpho early Tuesday, closing out leveraged positions in about 14 minutes while leaving lenders whole. Pendle and Steakhouse Financial, the vault curator that configured the price feed, both say the oracle behaved as intended. The episode exposes the same structural weakness that keeps appearing in looped yield strategies: a lending market whose collateral is priced by a pool a fraction of its size.

The affected market lends against principal tokens from Pendle's reUSD pool, which matures Dec. 10 and holds $8.97 million of liquidity, per Pendle's API. On Morpho, that market held $67.5 million of collateral against $52.2 million of borrows at a 91.5% liquidation threshold, leaving borrowers who had looped up to health factors of 1.03 with less than a 3% buffer against any price move.

Morpho's API records 33 liquidation events between 04:37 and 04:51 UTC across the two affected markets, repaying $36.14 million of debt and seizing 38.6 million principal tokens — $35.19 million in the USDC market and $956,000 in USDT, with realized bad debt in both at zero. A single liquidator contract handled 96% of the repayments, and the three largest borrowers lost positions of $13.01 million, $11.01 million and $6.83 million. Outside those two markets, Morpho had effectively no liquidation activity on Tuesday: every other market on Ethereum and Base combined totaled $731, and the Pendle Ecosystem Vault on Morpho was unaffected.

The oracle mechanics matter. Steakhouse configured the feed to take the lower of two prices: the principal token's own market price on Pendle as a 15-minute average, or a fixed curve rising to $1 at maturity along a 6% annual discount. When the market price fell, the 15-minute average became the reference and cut collateral values on looped positions. Pendle said 'the oracle for this market was set up correctly and functioned as intended,' and that 'this was not a misconfiguration, despite the unfortunate outcome.' Steakhouse put the move at 2.8% on high volume and said its systems withdrew liquidity from all affected markets as a precaution before restoring it. Onchain data show supply in the USDC market fell 25% from $82.9 million at midnight to $62 million by mid-afternoon, with borrows down 27%.

PENDLE fell 4.3% to $1.74 and MORPHO fell 5% to $2.52 as of 16:01 UTC, per CoinGecko, against a 3.2% decline in total crypto market cap; both remained up on the week, PENDLE by about 29%. Pendle's fees ran to $91,863 on Tuesday, after $54,640 on Monday and $15,306 on Sunday, per DefiLlama, while its total value locked sits at $1.18 billion, down 88.5% from $10.3 billion a year earlier.

The price feed did what it was built to do, and lenders came out whole, helped by a fast engine and a single liquidator contract that handled 96% of the repayments. That leaves the structure as the risk: a $67.5 million collateral book priced off an $8.97 million pool. For institutional participants, the question is whether the pricing pool can absorb the book built on it.