BitMart reported that attackers drained $391,000 from wallets across Base, Arbitrum and Optimism in a breach dated November 2, 2026, and confirmed by founder Sheldon Xia on November 3. The exchange described the incident as small-scale, said it launched an investigation and strengthened security measures, while Xia acknowledged that restructuring had left its security team seriously understaffed amid continued attacks and threats. BitMart was winding down under court supervision after announcing the process on July 26 and halting trading on August 26, with users seeking repayment. On-chain analysis placed the breach about 53 minutes before a separate Mercado Bitcoin attack that caused roughly $48.6 million in losses, but the connection remains unconfirmed.