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CryptoMedium•2 November 2026•
1 min read

Mercado Bitcoin Raises Security Breach Loss Estimate to $46 Million

Key Facts

1Mercado Bitcoin, Brazil's largest exchange, paused deposits and withdrawals following a security breach.
2Tether froze more than 4.5 million USDT linked to the security attack.

Mercado Bitcoin, Brazil's largest cryptocurrency exchange, raised its estimated losses from a recent security breach to $46 million. The exchange confirmed that the Bitcoin and Ethereum networks were among the 10 different blockchains targeted in the attack, necessitating a continued suspension of deposits and withdrawals to safeguard remaining assets.

Decrypt reported that suspicious transfers were detected draining the exchange's digital wallets before operations were halted. Tether has frozen more than 4.5 million USDT linked to the incident to mitigate the impact on the regional digital asset sector.

These developments precede the Central Bank of Brazil's interest rate decision scheduled for November 4, 2026, which local markets are monitoring amid heightened caution.