MainStreet-Linked Stablecoin MSUSD Slumps 85% as Liquidity Fears Mount

MSUSD, a stablecoin associated with MainStreet Finance, plunged as concerns grew around liquidity and market plumbing. Blockchain security firm PeckShield said the token—intended to trade at $1—has dropped as much as 85%, while utilization in Morpho's msY/USDC market has climbed to 100%. The stress has drawn attention to AlphaUSDC Delta V2, an AlphaPING-managed strategy. Data indicates the strategy has roughly 30% exposure to the affected market, totaling about $18 million. The selloff followed Accountable's decision to end its validation agreement with MainStreet Finance, prompting questions about MainStreet's proof-of-reserves setup. MainStreet developers said the protocol remains fully collateralized, attributing the disruption to a third-party proof-of-reserves panel being disabled rather than to asset losses or portfolio deterioration. "This is an infrastructure and reporting issue, not a solvency issue," MainStreet said. The protocol added that with the dashboard offline, the oracle supporting the Morpho market is expected to stop operating within the next 24 hours, unsettling traders and pushing borrowing rates higher. MainStreet said it has recently closed some short-term box spread positions and moved more than $8 million in USDC to the mint to support liquidity. It also said it is speaking with alternative proof-of-reserves providers, unwinding positions to restore liquidity, and is prepared to act as a "liquidation provider and liquidator of last resort" if necessary. According to the organization, MainStreet's core portfolio is largely composed of box spread positions designed to converge to fair value at maturity, making NAV more predictable when held to term. MainStreet cautioned that exiting before maturity can be challenging, with potential costs including transaction fees, wider bid-ask spreads, market maker discounts, and other deductions depending on liquidity. MainStreet reiterated that the portfolio is fully backed, while noting that immediate liquidity depends on market depth and market maker appetite. This is not investment advice.