On November 2, 2026, attackers compromised a system at Mercado Bitcoin and transferred more than $40 million in crypto from exchange-associated wallets across various blockchains. The exchange contained the incident and temporarily suspended deposits and withdrawals while investigating the transfers. Tether froze more than $4.5 million USDT associated with the theft. Mercado Bitcoin stated that customers would not incur losses and that no customer data was exposed

Brazil’s largest crypto exchange Mercado Bitcoin suffered a security incident in the early hours of November 2, 2026. Attackers drained approximately $38 million from its multi-chain hot wallets and some deposit addresses. The platform quickly suspended deposits and withdrawals, stated that no customers were affected and no data was leaked, and will absorb the loss itself. About $11 million has been frozen.