Approximately $49 million stolen from Mercado Bitcoin’s hot wallet; about $11 million frozen.

Mercado Bitcoin, Brazil's largest crypto exchange by Chainalysis' reckoning, confirmed on Nov. 2 that a security breach drained roughly $49 million from its hot wallets across 17 blockchains, with the largest portions in Bitcoin and Ethereum and additional flows on Base, Tron, Polygon, Solana and Stellar. The exchange has frozen about $11 million so far—roughly 22% of the stolen total, including over $9 million in USDT frozen by Tether, which first froze more than 4.5 million USDT after Hypernative flagged the outflows—leaving about $38 million unfrozen, with Tether, Circle, BRL1, Paxos and Chainalysis assisting. Deposits and withdrawals have been suspended since the incident, with no restoration date announced, and the exchange's initial claim that "customers suffered no losses" has been questioned by on-chain experts. The hack came just three days after Binance disclosed a hot wallet theft of about $6.3 billion, intensifying scrutiny of exchange custody practices. Watch for whether stablecoin issuers can freeze more of the remaining funds, updates on the five attacker addresses disclosed by the exchange (including EVM address 0xe485e7A70b1131216Cb47CA4555c4Bbb2C742478), and the timeline for restoring withdrawals.