Volo Protocol Freezes $1.5M in WBTC After Sui Hack

Volo Protocol reported it has frozen part of the $3.5 million stolen in an April 21 exploit on the Sui network and seized 19.6 Wrapped Bitcoin (WBTC), roughly $1.5 million at current prices, while coordinating with ecosystem partners on recovery options.

The breach affected three Volo Vaults and involved losses of WBTC, XAUm and USDG. Volo intercepted and blocked attempts to swap 19.6 WBTC into assets it described as unrecoverable. The project previously froze about $500,000 while working with partners to secure additional funds.

Volo attributed the incident to an administrative key compromise that targeted a subset of its vaults. The protocol said its other vaults, which hold about $28 million in total value locked, are not vulnerable to the same attack vector. As a precaution, Volo has temporarily frozen all vaults until it can present a full account of the incident and a plan to compensate affected users.

Volo is working with custodians, on-chain investigators and other ecosystem partners to plan recovery of the frozen tokens and potential compensation. On-chain teams are focused on preventing rapid swaps of stolen protocol-native tokens into major cryptocurrencies such as Bitcoin and Ether, which attackers often use to place assets beyond reach of freezes and clawbacks.

SuiLend, a lending platform on Sui, posted that none of its markets were affected and that deposits, borrowing and withdrawals continued to function normally. Platform operators and users on Sui have been monitoring on-chain activity for signs of broader contagion; current statements from Volo and other Sui-based platforms indicate the incident was limited to the compromised vaults.

April has seen several high-dollar DeFi breaches. Volo’s $3.5 million loss is part of a string of exploits this month that amount to nearly four times the combined losses recorded in the first three months of 2026. Some earlier incidents involved cross-protocol contagion and the use of cross-chain services to move stolen funds into Bitcoin or other major cryptocurrencies.

SUI traded around $0.97 at the time of the report, up about 2.7% in the past 24 hours. Total value locked on the Sui network fell roughly 3.4% over the same period, a decline of about $20 million.

Investigations into the exploit are ongoing. Volo has limited withdrawals on affected vaults while it completes a forensic review and continues discussions with partners about potential recovery routes and user compensation.