Security agency: Arbitrum's on-chain FutureSwapX contract was hacked, resulting in a loss of nearly $400,000.

According to Mars Finance, BlockSec monitoring revealed a suspicious transaction in the Arbitrum on-chain FutureSwapX contract, with an estimated loss of approximately $395,000. BlockSec stated that they have attempted to contact the team but have not yet received a response. The attacker appears to have stolen funds through multiple changePosition operations, ultimately withdrawing USDC. Since the contract is not open source, the exact root cause still requires further investigation. Based on on-chain behavior, it is suspected that the incident may be related to unexpected changes in the stable balance during early position updates, which resulted in the release of USDC during position reductions or liquidations.