Circle had several hours or days to freeze illicit USDC funds in many of the 15 cases presented, but failed to act, according to ZachXBT.
Onchain detective ZachXBT claims that Circle, the issuer of the USDC (USDC) stablecoin, has failed to freeze or blacklist about $420 million in illicit fund flows since 2022.
Circle can freeze illicit funds and blacklist wallet addresses, but either took “minimal” action to freeze illicit flows or failed to act in 15 separate hack-and-fraud cases, including those linked to North Korean (DPRK) state-affiliated hackers, ZachXBT said.
The stablecoin issuer allegedly failed to freeze $9 million in USDC from the GMX decentralized exchange (DEX) hack in July 2025, and blacklisted wallets linked to the $200 million Cetus DEX hack in May 2025 after USDC was converted into Ether (ETH), according to ZackXBT.
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