The decentralized stablecoin msUSD, issued by Main Street protocol, collapsed from its $1 peg on June 20, 2026, following a cascade of liquidations and deep liquidity imbalances. On-chain data and smart contract logs reveal a severe loss of value, with the token trading down by as much as 85–90%.
The depeg was triggered by sudden market volatility that hit the regional collateral pools backing msUSD. This created a rapid spiral of liquidations and a critical imbalance in the protocol’s liquidity pools. Blockchain security firm PeckShield noted that borrowing rates spiked dramatically, with the utilization rate in the msY/USDC market on Morpho reaching 100%. As a result, the AlphaUSDC Delta V2 strategy managed by AlphaPING—which had roughly 30% exposure (approximately $18 million) to that market—came under intense scrutiny.
Adding to the turmoil, Accountable terminated its validation agreement with Main Street Finance, casting doubt on the protocol’s proof-of-reserves infrastructure. Main Street developers pushed back, insisting the protocol is fully collateralized and that the issue is “an infrastructure and reporting issue, not a solvency issue.” The shutdown of the dashboard caused the oracle supporting the Morpho market to cease operations, fueling market panic.
In response, Main Street closed some short-term box spread positions and moved over $8 million in USDC to the mint to support liquidity. The team is in talks with alternative proof-of-reserves providers and is prepared to act as a “liquidation provider and liquidator of last resort.” However, they acknowledged that early liquidation of box spreads could incur significant fees and widen bid-ask spreads, depending on market depth and maker appetite. At the time of the incident, the protocol’s total value was reported at around 1.1 trillion units, with 318 billion directly affected by the crisis. The event underscores the inherent risks in decentralized stablecoins when market stress outpaces risk management design.
