Full Sail DEX Shuts Down After $91K Vault Exploit on Sui

Full Sail DEX announced its permanent shutdown on August 30, 2026, one day after an attacker drained roughly $91,000 from three of its vault contracts on the Sui network. The closure makes the decentralized exchange the latest 2026 DeFi protocol to cease operations following a security breach rather than weak user adoption. The exploit was detected on August 29 when on-chain monitors flagged unusual outflows from Full Sail's vault addresses. The attacker exploited a vulnerability in the vault contracts that manage user deposits, extracting funds across three separate transactions. The protocol's team confirmed the breach hours later and initiated an emergency pause on all contract interactions. By August 30, the team published a formal wind-down notice stating that the protocol would not resume operations. Full Sail operated as an automated market maker on Sui, a layer-1 blockchain that launched its mainnet in May 2023. The DEX offered concentrated liquidity vaults where users deposited token pairs to earn trading fees. The compromised vaults held a mix of SUI and stablecoin deposits. Market data shows the $91,000 loss represents a fraction of the protocol's peak total value locked, which surpassed $2 million in early 2026 before declining amid broader market contraction. The vulnerability class appears to be a reentrancy vector in the vault withdrawal logic, though the team has not published a full post-mortem. Reentrancy attacks exploit a contract's failure to update its internal state before making an external call, allowing an attacker to recursively withdraw funds. Per market reports, this pattern has accounted for several major DeFi exploits since 2020, including the $73 million Curve Finance incident in July 2023. No user funds beyond the vault deposits were affected. The protocol's front-end interface remains accessible for withdrawal of any unaffected positions. The team has not announced a compensation plan for vault depositors, and no law enforcement involvement has been disclosed. SUI traded at $0.766 at 14:00 UTC on September 3, up 5.32% in the prior 24 hours and 3.20% over the past seven days, per CoinGecko. The token's seven-day close prices were $0.78, $0.75, $0.74, $0.76, $0.73, $0.73, and $0.72. Figures from the desk show total crypto market cap stood at $2.63 trillion with 24-hour volume of $74.7 billion at the same timestamp.

The shutdown adds to a growing list of 2026 DeFi closures tied to security incidents. Market data shows in March, the lending protocol Cascade folded after a $2.1 million oracle manipulation attack. In June, the yield aggregator Merit ceased operations following a $440,000 flash loan exploit. Both protocols cited the inability to recover user trust and the cost of audits as factors in their decisions to wind down rather than rebuild. Sui's DeFi ecosystem has contracted from 18 active protocols in January 2026 to 11 as of August, per DefiLlama data. Total value locked across the network fell from $420 million to $185 million over the same period. Full Sail's exit removes one of the network's few native DEX options, concentrating volume on the remaining automated market makers. The team has advised users to revoke any token approvals granted to Full Sail contracts using a revocation tool. They have also urged users to monitor the protocol's official channels for any updates on fund recovery efforts, though none have been announced.