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Most financial regulation applies more scrutiny as an institution grows. MiCA does that, and it also does something unusual: for stablecoins denominated in currencies other than the euro, it sets a point beyond which the issuer must stop issuing.
Two separate mechanisms are at work, and they are frequently confused. One escalates supervision when a token crosses size thresholds. The other caps how widely a non-euro token may be used for payments inside the EU. The first makes a stablecoin more regulated. The second makes it stop growing in a specific direction. This guide explains both, what triggers each, and where the published figures disagree.
Significance is an escalation. The payment cap is a ceiling. Confusing the two produces the impression that Europe merely supervises large stablecoins more closely, which is only half of what the regulation does.
Key Takeaways
- Two mechanisms exist. Significance escalates supervision; the payment cap limits usage.
- Three criteria must be met. Significance requires crossing at least three thresholds, not one.
- EMT supervision becomes joint. The EBA shares oversight rather than replacing the national regulator.
- Non-euro tokens face a usage ceiling. Exceeding it obliges the issuer to stop issuing.
- Published thresholds conflict. Secondary sources report different figures for the same rules.
The First Mechanism: Significance
MiCA classifies stablecoins into two categories, and both can be designated significant.
E-money tokens reference a single official currency, so a euro or dollar stablecoin sits here. Asset-referenced tokens reference a basket of currencies, commodities, or crypto assets, and carry heavier obligations. Almost nobody has issued a true ART, since the category was drafted with Facebook's abandoned Libra project in mind.
Designation is not triggered by a single number. According to the European Banking Authority, a token is deemed significant when at least three criteria are met, spanning quantitative thresholds specified in MiCA and qualitative indicators set out in Commission Delegated Regulation 2024/1506.
What the Criteria Measure
The quantitative criteria track size and activity across four dimensions.
| Dimension | What it captures |
|---|---|
| Holder count | Number of users holding the token |
| Issuance value | Market capitalisation or reserve assets |
| Transaction count | Average daily transactions |
| Transaction value | Average daily transaction volume |
Two qualitative criteria sit alongside these, covering interconnection with the financial system and the significance of the issuer's cross-border activities. A separate trigger applies where the issuer is a designated gatekeeper under the Digital Markets Act.
A word of caution about the numbers. Secondary sources report materially different figures for these thresholds, in part because ART and EMT thresholds differ and are frequently conflated. The EBA's own materials and the delegated regulation are the authoritative reference, and anyone relying on a specific figure should take it from there rather than from summaries.
What Changes on Designation
The consequences differ by token type, and the distinction is more precise than most coverage suggests.
For significant asset-referenced tokens, the EBA takes over direct supervision at EU level from the home competent authority. For significant e-money tokens issued by electronic money institutions, the EBA and the national authority supervise jointly, with the EBA overseeing compliance with the additional requirements applying to significant EMTs, mainly on liquidity and own funds.
Capital requirements also rise. Article 35 sets own funds of at least €350,000 or 2% of the average reserve of assets, whichever is higher, with an enhanced requirement for significant tokens.
The reserve floor moves as well. A significant e-money token must hold a higher minimum share of reserves as deposits in EU credit institutions than a non-significant one, which means growth mechanically increases a euro stablecoin's exposure to European banks.
The Second Mechanism: A Ceiling on Payments
This is the provision that makes MiCA structurally different from other stablecoin frameworks, and it applies only to tokens referencing currencies other than the euro.
Where such a token is used as a means of exchange within the EU and its usage exceeds defined thresholds, reported as around 1 million transactions and €200 million per day measured as quarterly averages, the issuer is obliged to stop issuing and to submit a plan to its national authority to bring usage back below the limit.
The scope is narrow and deliberate. The cap applies to use in payment for goods and services rather than to trading, custody, or on-chain settlement, so a dollar stablecoin can be held and traded in Europe at any scale. What it cannot do is become a widely used payment instrument inside the euro area.
That is a monetary policy instrument written into a market regulation, and it is the same concern our guide to stablecoins and monetary sovereignty examines in a global context.
Why Europe Wrote a Ceiling
The reasoning follows from the shape of the market rather than from hostility to the instrument.
Roughly 98% of global stablecoin value is dollar-denominated, and the euro segment is a fraction of a percent of the total. Without a limit, the plausible outcome of stablecoin adoption in Europe is not a euro payment layer but a dollar one operating inside the euro area.
The cap addresses that directly. It permits dollar stablecoins to exist, trade, and settle in Europe while preventing them from becoming the medium of exchange, which preserves the euro's role in payments without banning the competing instrument.
Whether that succeeds is a separate question. A ceiling on dollar payment usage does not by itself create demand for euro alternatives, and the euro stablecoin market has stayed small throughout the period the rule has been in force.
Who Has Actually Been Designated
Here the public record is genuinely unclear, and it is worth being direct about that.
Reporting in 2026 indicated the EBA had applied significant status to a small number of stablecoins by March, with USDC, EURT and EURC named. Separate analysis published around the same period stated that no token had been formally designated significant as of the first quarter, in the specific context of asset-referenced tokens.
Part of the discrepancy is definitional, since ART and EMT designations follow different articles and different processes. Part of it is that designation decisions are not always announced with the prominence of a licensing approval.
The practical takeaway is that this regime is early. The thresholds shape issuer behaviour well before any designation occurs, because issuers structure around them in advance, as our guide to how stablecoins are regulated describes across jurisdictions.
How This Compares to the US
The contrast clarifies what is distinctive about the European approach.
The GENIUS Act scales obligations with size, most visibly at the $10 billion threshold that moves an issuer from state to federal oversight, and it restricts which stablecoins US platforms may offer from July 2028, as our guide to the 2028 deadline sets out.
What the US framework does not contain is a usage ceiling. A compliant dollar stablecoin can become as widely used for payments in the United States as the market allows, because there is no domestic currency the instrument competes against.
Europe faces the opposite situation, and wrote a rule for it. That is the cleanest explanation for why the two frameworks diverge on this specific point despite converging on reserves, disclosure, and redemption.
What This Means in Practice
Three implications follow for anyone tracking the European market.
Growth in a euro stablecoin increases both its supervisory burden and its bank deposit exposure, so scale is not purely an advantage for an issuer operating under MiCA.
Dollar stablecoins face a structural limit on one use case in Europe that they face nowhere else, which affects where issuers direct payment partnerships rather than where they list tokens.
And the regime remains largely untested. The euro market is small, designations are few, and no issuer has publicly hit the payment ceiling, so how these provisions behave under real pressure is not yet known.
Conclusion
What happens when a stablecoin gets too big in Europe? Two different things, depending on which threshold it crosses.
Crossing at least three significance criteria brings additional obligations, higher own funds, and either EBA supervision or joint supervision with the national authority, depending on whether the token is an asset-referenced token or an e-money token.
Crossing the payment usage threshold, which applies only to tokens referencing non-euro currencies, requires the issuer to stop issuing and submit a remediation plan. That second mechanism has no equivalent in the US framework, and it is the clearest statement in MiCA of what the regulation was actually written to protect.
Read Next:
- How Are Stablecoins Regulated?
- Do Stablecoins Undermine Monetary Sovereignty?
- What Happens to USDT in the US After July 2028?
FAQs:
1. What makes a stablecoin significant under MiCA?
Meeting at least three criteria rather than any single one. The quantitative criteria cover holder count, issuance value, average daily transaction count, and average daily transaction value, alongside qualitative indicators on financial system interconnection and cross-border activity specified in Commission Delegated Regulation 2024/1506.
2. What changes when a stablecoin is designated significant?
Supervision and capital requirements. For significant asset-referenced tokens the EBA takes over direct supervision from the home authority, while for significant e-money tokens the EBA and national authority supervise jointly with the EBA covering the additional liquidity and own funds requirements. Own funds under Article 35 are at least €350,000 or 2% of average reserves, rising for significant tokens.
3. Does MiCA limit how much a dollar stablecoin can be used in Europe?
For payments, yes. Where a token referencing a non-euro currency is used as a means of exchange within the EU beyond defined thresholds, reported as around 1 million transactions and €200 million per day on a quarterly average basis, the issuer must stop issuing and submit a plan to bring usage below the limit. The cap applies to payment for goods and services rather than to trading, custody, or settlement.
4. Which stablecoins have been designated significant?
The public record is unclear. Reporting in 2026 indicated the EBA had applied significant status to a small number of tokens by March, naming USDC, EURT and EURC, while separate analysis stated no token had been formally designated in the context of asset-referenced tokens. The two designations follow different articles and processes, which explains part of the discrepancy.
5. Does the US have an equivalent usage cap?
No. The GENIUS Act scales obligations with size and restricts which stablecoins US platforms may offer from July 2028, but it contains no ceiling on how widely a compliant stablecoin may be used for payments, since there is no domestic currency the instrument competes against.
Disclaimer:
This content is provided for informational and educational purposes only and does not constitute financial, investment, legal, or tax advice; no material herein should be interpreted as a recommendation, endorsement, or solicitation to buy or sell any financial instrument, and readers should conduct their own independent research or consult a qualified professional. Regulatory thresholds cited here are reported inconsistently across secondary sources and should be verified against EBA materials and the underlying regulation.
