A court order in the Overnight Finance lawsuit directed Circle to freeze a batch of USDC assets — and in the process froze roughly $12.6 million sitting in Zama’s confidential-computing cUSDC contract. Zama CEO Rand Hindi described the contract as having been “caught in a crossfire,” with the team still investigating the scope of the freeze. The incident occurred in late May 2026, and the underlying mechanism is straightforward: as the issuer of USDC, Circle technically retains the ability to blacklist any address — a single court order is enough to lock on-chain balances in place, regardless of whether that address is the actual target of the litigation.
Editorial take: what this has to do with the U-card in your pocket
The short answer first: the vast majority of USDT virtual card users are not directly affected by this incident, but it puts its finger precisely on a fact long obscured by marketing language — stablecoins are not cash, and the issuer’s freeze switch can be triggered by legal process at any time.
It helps to separate two layers of risk:
- If you simply hold USDC/USDT in your own on-chain wallet: the odds of being directly targeted by a court-ordered freeze are extremely low, unless your address is directly named in litigation or a sanctions list. What makes Zama’s case unusual is that it’s a contract address — a contract that pools funds from many users, so once the contract itself is blacklisted, everyone’s share gets caught in the same net. This is the systemic risk baked into “contract-custody” products.
- If you use a top-up-style U-card: your money isn’t sitting in an on-chain address you control — it flows through the issuer’s intermediary wallets, acquiring banks, and clearing networks. Any link in that chain can be temporarily halted by compliance review — and that’s the thing U-card users should actually be watching.
This is exactly why we keep emphasizing fund-flow transparency in our MPCard review. MPCard Asia Elite runs on an Asia-Pacific rail with a relatively concentrated clearing path — which segments your deposited USDT passes through, and what triggers KYC review, matter more than “which chains it supports.” By comparison, a product like MetaMask Card, which is bound directly to a self-custody wallet, keeps your on-chain balance in your own hands — but spending still routes through the issuer’s stablecoin settlement, so the freeze risk simply shifts from the “holding side” to the “spending side.”
On the timeline: within 7 days, this looks like an isolated litigation-driven freeze, unlikely to trigger a USDC depeg or a run; within 30 days, watch whether Zama and Circle reach an agreement to unfreeze or partially release funds over the “contract caught in the crossfire” issue; within 90 days, if similar “contract-wide freeze” cases become more common, expect design changes across confidential-computing and privacy-stablecoin products.
Historical comparison: this isn’t 2022 Tornado Cash, and it isn’t 2023’s USDC depeg
Lining up the three events side by side makes the boundaries clear:
| Event | Trigger | Nature | User Impact |
|---|---|---|---|
| 2022 Tornado Cash sanctions | OFAC administrative sanction | Protocol-level sanctions listing | Interacting addresses had USDC frozen |
| 2023 SVB crisis USDC depeg | Reserve bank failure | Reserve redeemability crisis | Briefly depegged to 0.87, later recovered |
| 2026 Zama cUSDC freeze | Court civil litigation order | Single contract address targeted freeze | $12.6M locked, pending ruling |
What’s the same: all three confirm that USDC’s freezability is a designed-in feature, not a bug. Circle has never hidden the issuer’s retained blacklist capability on its transparency page.
What’s different: the 2023 event was a reserve crisis — every USDC holder was affected equally, and it rippled through nearly every U-card at the time. This one is a targeted freeze — it only hits a specific contract, so the systemic contagion risk is far lower. In other words, in 2023 you had reason to worry about whether your entire card would work at all; this time, you generally don’t need to worry — unless your funds happen to sit in that specific Zama contract.
Compliance boundaries: where the legal gray area lies
This incident draws a clear line:
- Clearly legal: the issuer freezing assets under a court order is part of Circle’s obligations as a licensed US issuer — nothing questionable about it.
- Gray area: when a freeze “catches” third-party contract users unrelated to the lawsuit, who is responsible and what remedy is available remains largely untested. Whether Zama’s users can independently petition a court to unfreeze their share depends on the specific jurisdiction.
- A note for Chinese-speaking users: this is closely tied to which jurisdiction you’re using your card in. If you plan to use a U-card with overseas services, we recommend first reading our US compliance guide to understand the obligations of licensed issuers like Circle, then comparing it against our Hong Kong compliance guide for how local stablecoin regulations differ — regulatory attitudes toward “issuer freeze power” are not the same in the two jurisdictions.
Milestones worth watching next
- Zama’s official statements: whether they disclose the frozen contract address and whether they’ve applied for a partial unfreeze — this is the first-hand signal on whether the $12.6M can be released.
- Progress in the Overnight Finance lawsuit: whether the court narrows the freeze scope to addresses directly relevant to the litigation.
- Circle’s quarterly transparency report: watch whether the count of blacklisted addresses and frozen amounts gets updated.
- Reaction from the privacy-stablecoin sector: whether products like cUSDC / confidential USDC adjust their contract-custody structure to avoid “guilt by association” freezes.
Editorial recommendations
- If you hold MetaMask Card or self-custody wallet balances: no action needed. Your on-chain funds are not in the Zama contract, and this freeze doesn’t concern you.
- If you use a top-up-style U-card (e.g., MPCard, Coinbase Card, etc.): also no reason to panic, but treat this as a reminder — when choosing a card, prioritize fund flow and clearing path over the number of chains it supports. See our Top 5 U-Cards of 2026 for a comparison of custody models across cards.
- What not to do: don’t panic-convert all your USDC into USDT over this news — USDT carries the same issuer freeze switch (Tether’s freeze record is, in fact, more frequent than Circle’s). Switching coins doesn’t eliminate the fundamental risk of centralized stablecoins; it just swaps one issuer for another.
Bottom line: this freeze is the stablecoin mechanism working exactly as designed, not a black swan event. What it should change isn’t what you do with your card tonight, but the criteria you use to pick your next one.