Circle Freeze Hits Zama-linked cUSDC, Trapping $12.5M

Published: 2026-05-30 18:20:29 |

Circle froze a Zama-linked confidential USDC wrapper contract after an address tied to the Overnight Finance hack deposited about $12.5M in USDC. Circle’s compliance system flagged the external depositor once the funds were already inside the cUSDC wrapper. Because more than 99% of the cUSDC contract balance originated from the flagged wallet, the freeze paused the entire contract and trapped user funds, not just the suspect address. Zama said the action was not a sanction against Zama or its privacy/confidential finance tools. It described the freeze as collateral damage from a standard DeFi restraining order process. The company noted the cUSDC wrapper had limited prior use, so the large hack-related deposit became the contract’s dominant balance and the target of the request. To contain risk and regain access, Zama paused its cUSDC, cUSDT, and cWETH contracts during its review of related addresses. Zama said it is working with the relevant parties and its legal team to isolate the flagged wallet and restore service for unaffected participants. It also said public transaction paths remain reviewable via blockchain explorers and rejected claims that the system functions like a mixer. Keyword note: this is a Circle freeze impacting a Zama-linked cUSDC contract, and the trapped user funds stem from the cUSDC contract being swept into the holding freeze after compliance flagged the depositor.

Neutral

This is primarily a compliance/legal “holding freeze” affecting a specific Zama-linked cUSDC wrapper. While it trapped about $12.5M and paused cUSDC/cUSDT/cWETH for affected users, the headline does not indicate a broader, market-wide stablecoin depeg risk or systemic Circle failure. Similar past DeFi events show that compliance freezes can cause localized liquidity outages and volatility in the affected wrapper/token, but often do not spill over to the whole stablecoin market once teams isolate the flagged address and restore access. Short term, traders may see negative sentiment around cUSDC wrapper usability, wider bid/ask spreads, and potential temporary risk-off positioning for related DeFi infrastructure. Zama’s pause across cUSDC/cUSDT/cWETH may also reduce activity and volume. Long term, this could slightly increase attention to counterparty and deposit-source risk in DeFi (e.g., how large balances tied to flagged depositors can trigger collateral freezes). If Zama publishes a post-mortem and mitigates future legal-request handling, confidence can stabilize. Overall, the impact looks contained to the affected contract rather than the broader market.