Arbitrum On-Chain FutureSwapX Hack Triggers Nearly $395k Loss

BlockSec flags a suspicious on-chain transaction in Arbitrum’s FutureSwapX contract, with an estimated loss around $395,000 as investigations continue.

Rich by Coin

2026-01-10

BlockSec monitoring flagged a suspicious on-chain transaction in the Arbitrum on-chain FutureSwapX contract, with an estimated loss of approximately $395,000. The attacker appears to have stolen funds through multiple changePosition operations, ultimately withdrawing USDC. BlockSec stated that it has attempted to contact the team but has not yet received a response.

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.