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Mercado Bitcoin, Brazil’s largest cryptocurrency exchange, said it contained a security incident involving approximately $46.3 million in assets. The exchange temporarily suspended deposits and withdrawals as it investigates, tracks the funds and coordinates with authorities.
Why it matters
Mercado Bitcoin said the incident did not affect customers or result in a data breach. It published destination wallet addresses to help security firms and others monitor the transactions. Arkham analyst Emmett Gallic said the attacker was sweeping funds from older deposit addresses and selling memecoins and other altcoins.
Tether CEO Paolo Ardoino confirmed that the stablecoin issuer froze more than 4.5 million USDT linked to the incident. That response may constrain some of the funds’ movement, while the exchange and investigators continue tracing the assets.
Market impact
The temporary suspension puts deposits and withdrawals at the center of the immediate response for Mercado Bitcoin users. The exchange has not said when those services will resume.
The incident follows a series of security events across crypto: a reported $6 billion Binance hack, a $2.65 million Polymarket exploit, unauthorized access to Chainalysis customer data, and a malware attack on DeFi websites that stole about $138,000. Chainalysis said its incident was unrelated to the Binance theft. The cases put exchange controls, third-party exposure and wallet security under renewed scrutiny.
Frequently asked questions
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How much was involved in the Mercado Bitcoin security incident?
The exchange said the incident involved approximately $46.3 million in assets.
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What services did Mercado Bitcoin suspend?
The exchange temporarily suspended deposits and withdrawals as a precaution while it investigates and tracks the assets.
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Did Mercado Bitcoin say customer accounts or data were affected?
No. The exchange said the incident did not affect customers or result in a data breach.
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What action did Tether take in response to the incident?
Tether CEO Paolo Ardoino confirmed that the issuer froze more than 4.5 million USDT linked to the incident.
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How did the attacker move funds, according to an Arkham analyst?
Arkham analyst Emmett Gallic said the attacker was sweeping funds from older deposit addresses and selling memecoins and other altcoins.
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