According to arbitration filings disclosed by The Block, Circle suspended business related to arbitrage fund Heka Funds over suspected market manipulation, after learning that Tether had invested roughly $800M in the fund. This is a rare, legally documented direct clash between the two stablecoin giants — USDC issuer Circle and USDT issuer Tether. The core of the event is not a stablecoin depegging, but a conflict of interest between the two issuers over a shared capital operation that has now landed in arbitration. Neither party has yet issued a public statement aimed at retail users regarding the fund-level dispute; all information currently comes from the arbitration filing disclosure.
What This Means for USDT Card Users
Here’s the bottom line first: this is a capital-operations dispute between issuers — it is not a reserve issue, and it is not a settlement risk. The Asia Elite variant you’ll find in our MPCard review, along with Bybit Card and RedotPay — cards that rely mainly on USDT top-ups — follow a top-up path of “user USDT → issuer custody → fiat settlement,” which has no direct financial link to arbitrage funds like Heka Funds.
- Within 7 days: No predictable impact whatsoever. USDT on-chain transfers, card top-ups, and spending settlement continue as normal.
- Within 30 days: Watch for any abnormal widening in the USDT/USDC exchange spread — with the arbitrage fund frozen, market-making depth between the two coins could theoretically be affected short-term, but this operates at the exchange level and only indirectly touches card top-up exchange rates.
- Within 90 days: What’s actually worth watching is whether this arbitration escalates into regulatory intervention. Only if it implicates Tether’s reserve disclosure practices could it indirectly affect issuers’ choices around USDT as a primary settlement currency.
For the vast majority of readers who use USDT to top up for subscriptions or cross-border spending, the practical impact of this news is close to zero.
Historical Comparison: This Is Not the Same as the 2023 USDC Depeg
Many readers, upon seeing “Circle” and “Tether” mentioned together, will think of USDC’s brief depeg to $0.87 in March 2023 due to Silicon Valley Bank exposure. The two events are fundamentally different in nature.
- The 2023 USDC depeg: A reserve-asset problem (bank deposits) that directly hit the coin’s price. Holders suffered real losses, and card top-up exchange rates swung dramatically at the time.
- This Heka Funds incident: An investment dispute between two issuers over a third-party arbitrage fund. The coin’s price itself has not moved abnormally — this falls under “corporate governance / business rivalry,” not “stablecoin peg risk.”
A more apt comparison is actually the business rivalry between issuers in 2024 — the market briefly worried then too about ecosystem fragmentation between USDC and USDT, but it never transmitted through to card top-ups. When judging whether a stablecoin news story affects your card, there’s really only one question that matters: does it touch reserves/the peg, or the issuer’s corporate books? This time, it’s the latter.
Compliance View: The Gray Area Remains a Gray Area, but the Boundaries Haven’t Changed
This incident itself is occurring between an issuer and a fund, and has not triggered regulatory penalties in any jurisdiction. For USDT card users, what actually determines whether and how you can use these cards remains your local jurisdiction’s existing stance on stablecoin payments:
- For the compliant path under Hongkong’s virtual asset licensing framework, see the Hongkong Compliance Guide;
- The EU’s MiCAR has clear requirements on reserve disclosure for stablecoin issuers — if this dispute turns out to implicate reserve transparency, EU users should keep an eye on the EU Compliance Guide;
- The existing boundaries for mainland China users have not changed as a result of this event; see the Mainland China Compliance Guide.
At this stage, the matter remains an “issuer private-law dispute” — it is neither explicitly prohibited nor does it involve any individual user violation. It’s a textbook case of a commercial gray area that regulators have not yet entered.
Milestones Worth Watching Next
- Whether Circle / Tether issue a formal public statement — all information currently comes from arbitration filings, and either side speaking up would change the narrative.
- When the arbitration moves to substantive hearings or a ruling — this will determine whether the matter settles commercially or escalates into a regulatory issue.
- The USDT/USDC on-exchange spread — if the spread continues to widen over the coming month, it would indicate genuine disruption at the market-making level.
- Whether major card issuers adjust their USDT support policies — currently, all major USDT card issuers’ support for USDT remains unaffected, but this is the most direct user-facing signal to watch.
Editorial Recommendation
Users holding MPCard, Bybit Card, RedotPay, or other USDT cards need to take no action. This is a capital dispute between issuers, not a depegging event — your top-ups, spending, and settlements are unaffected, and there’s no need for panic withdrawals or card switching.
Users planning to apply for a new USDT card this month can proceed as usual — if you’re still comparing options, check out our 2026 Top 5 USDT Cards and Lowest-Fee USDT Card Comparison, and choose based on fees and regional fit rather than letting this news drive your decision.
The one scenario that warrants heightened caution: if you engage in large, frequent USDT/USDC arbitrage trades, keep a close eye on any abnormal on-exchange spreads over the coming month. For ordinary users simply topping up USDT for subscriptions or daily spending, this news falls under “worth knowing, no action needed.”