Circle's authority to freeze USDC transactions is facing mounting scrutiny after blockchain investigator ZachXBT revealed inconsistent application of its powers. The stablecoin issuer allegedly delayed freezing $420 million in illicit funds across 15 cases since 2022, while abruptly blocking 16 operational wallets tied to exchanges, casinos, and forex services in a sealed civil matter.

The freeze decisions carry significant weight for crypto markets, as USDC serves as a core settlement asset across exchanges, DeFi protocols, and payment flows. Circle's actions effectively define the operational risk threshold for dollar-denominated blockchain transactions. The company later unfroze at least one wallet belonging to Goated.com, raising questions about its address review process.

This controversy emerges as USDC maintains its position as the second-largest stablecoin, with $77.2 billion in circulation representing 24.5% of the nearly $316.8 billion stablecoin market. The Drift exploit case cited by ZachXBT saw over $280 million in USDC move through more than 100 transactions within six hours, highlighting the stakes of timely intervention.