Europe Named Its First 'Significant' Stablecoin. Brussels Still Hasn't Ruled on How It's Built.

On Wednesday, October 14, the European Banking Authority classified Circle's USDC as a "significant" e-money token under MiCA, the EU's crypto rulebook. Of the 45 e-money tokens notified in the bloc, USDC is the first to get the label. From November 12, the EBA itself, not France's ACPR, will directly supervise USDC's own funds, its reserve of assets, its liquidity, and its recovery and redemption plans. The same day, the EBA signed a memorandum of understanding with the New York State Department of Financial Services so the two regulators can share information about a token that is issued on both sides of the Atlantic.

The headlines treated it as a coronation. Europe's top banking supervisor had blessed a dollar stablecoin, and Circle had cleared the hardest bar in the world's strictest regime.

Read the fine print, though, and the order of events is strange. The EU has just assigned its most senior supervisor to a token whose basic architecture Brussels has spent a year refusing to rule on.

Europe gave USDC its toughest supervision before deciding whether USDC's structure is allowed.

USDC is not one token in the legal sense. It is two. Circle Internet Financial Europe SAS issues it in the EU under a French e-money license, and Circle Internet Financial, LLC issues it in the United States, as the EBA's own release notes. The coins are fully interchangeable: a USDC minted in Paris and one minted in New York look identical on-chain and trade as the same asset. The reserves, however, are split by jurisdiction. The industry calls this multi-issuance, and it is the entire reason a dollar stablecoin with global liquidity can exist inside MiCA at all.

The question of whether MiCA permits that setup has been open since before the rulebook fully took effect. Last year, the European Systemic Risk Board, chaired by ECB President Christine Lagarde, approved a recommendation to ban multi-issuance stablecoins. The fear is specific: MiCA gives holders a direct right to redeem at par, so in a crisis, holders outside the EU could redeem through the EU entity and drain the European reserve pool, leaving EU holders with claims against a foreign issuer. When Reuters asked the EBA about it, the authority said it was waiting for the European Commission to clarify whether multi-issuance is allowed under MiCA. In July of this year, the European Parliament voted 390 to 86 for a report that would put multi-issuance on a "sound legal footing", but that report is non-binding, and a legislative fix is widely expected only in 2027.

So the regulator now taking direct control of USDC's reserves is the same regulator that said it needed Brussels to tell it whether the token's design is permitted. As of this week, Brussels hasn't.

The "significant" label is a bill, not a medal.

Significance under MiCA is triggered by size and reach. A token qualifies when it meets at least three of seven criteria, including more than 10 million holders, more than 5 billion euros in issued value or reserves, and more than 2.5 million transactions worth over 500 million euros a day. The EBA didn't say which ones USDC hit. Given that Circle reported $73.3 billion in global circulation at the end of June, it was never going to be close.

What the label brings is cost. The EBA's reading of MiCA sets the minimum share of reserves held as commercial bank deposits at 30% for ordinary e-money token issuers and 60% for significant ones. Own-funds requirements rise too. Circle has been arguing against exactly these rules: in its October 1 submission to the Commission's MiCA review, it said the 60% deposit floor increases the EU banking sector's credit and counterparty exposure, sided with the ECB that the mandatory deposit minimum should be replaced with a more flexible liquid-asset requirement, and asked for the removal of a 35% cap on exposure to a single sovereign and a 1.5% cap per bank counterparty, which it says would force large issuers to keep reserve relationships with dozens of banks.

Think about what that means for a dollar token. A stablecoin backed by US dollars is being pushed to park the majority of its EU reserve in commercial bank deposits, spread thinly across many banks, rather than in short-dated Treasuries. The safety logic that underpins most dollar stablecoins, holding the most liquid sovereign debt on earth, runs straight into a European rulebook written to keep money inside the banking system.

The biggest stablecoin in the world faces none of this, because it left.

Tether's USDT is about two and a half times the size of USDC, at $184 billion against $73 billion. By every one of MiCA's significance tests, it would qualify. It never will, because it never applied. Tether chose not to seek MiCA authorization, and by the time the transition period ended on July 1, Coinbase, Crypto.com, Binance's EU arm and Kraken had already delisted or restricted USDT for European users. Tether still reaches the region indirectly, through partners issuing MiCA-compliant tokens built on its Hadron platform.

That is the pattern worth noticing. The EU's heaviest supervisory tier lands on the one large dollar issuer that chose to play inside the system. The issuer that walked away faces no EBA supervision, no 60% deposit floor and no redemption-plan review. Circle itself points out that of the top 25 stablecoins by market value, only three, USDC, USDG and EURC, are MiCA-regulated. Compliance, so far, has been rewarded with more compliance.

Concede the regulators' point, and the gap still stands.

The case for the EBA's approach is real and should be stated fairly. A token at USDC's scale is no longer a fintech product; it is a payments instrument with a $73 billion balance sheet, and putting it under a European-level supervisor rather than one national authority is exactly what MiCA promised. The NYDFS memorandum is a sensible piece of plumbing. If a run ever starts in New York, the EBA will at least hear about it from the regulator next door instead of from Crypto Twitter. And the ESRB's run scenario isn't paranoid: tokens that are fungible across borders but backed by ring-fenced reserves do create a mismatch that someone has to manage.

But that is precisely the problem. A memorandum about sharing information is not a rule about who pays out when holders in two jurisdictions show up at once. The EBA is taking over supervision of USDC's reserves and redemption plans on November 12, and the legal answer to the question those plans exist to address, whether an EU entity can stand behind tokens that circulate freely outside the EU, is still pending at a Commission that France's ACPR first asked about it in 2024. The supervisor is being handed the fire extinguisher before anyone has agreed what the building code says.

The rest of the market is watching how this resolves, because USDC is the template. Any dollar issuer that wants European distribution, and any euro issuer that wants global liquidity, will need some version of the same two-entity structure. If the Commission eventually sides with the ESRB, the first significant stablecoin in the EU will have been supervised for months under a structure the EU then declares unworkable. If it sides with Parliament, Europe will have spent a year treating its most compliant issuer as its biggest open question.

The EBA reassesses significance every year. The more useful date to circle is whenever Brussels finally answers the question it was asked in 2024, because until then, Europe's first significant stablecoin is being supervised on credit.