EU Stablecoin Reserves Under MiCA: ART vs EMT Issuer Rules

Why ART and EMT have different reserve regimes

The reserve regimes look similar at headline level — both require backing assets to cover the issuer’s liability to holders. They diverge in the specifics in ways that materially affect issuer operations.

The split is by what the token references:

• Asset-referenced token (ART) — references any other value or right or a combination thereof — baskets of currencies, commodities, real-world assets, multi-asset stablecoins. The reserve must reflect the basket and hedge market and exchange-rate risk arising from it.

• Electronic money token (EMT) — references a single official currency. The reserve is more prescribed because the reference is simpler — the issuer’s job is to maintain redemption-at-par against that one currency.

The regime fits the reference. Single-currency tokens get a partially prescriptive composition rule; multi-asset tokens get a principle-based rule with a published reserve-management policy.

ART reserve mechanics

The ART reserve rule requires the ART issuer to maintain a reserve of assets sufficient to cover the issuer’s liability to holders. The reserve must:

• Be composed and managed to hedge market and exchange-rate risks arising from the reference basket
• Maintain a value at least equal to the corresponding value of tokens in circulation
• Be managed prudently to avoid adverse effects on reserve-asset markets

The ART reserve rule adds the disclosure layer: the issuer must adopt and publish a clear and detailed policy describing the stabilisation mechanism, listing the reference assets and their composition, and providing a detailed risk assessment.

The custody rule (the ART reserve custody rule) requires reserve assets to be segregated from the issuer’s own assets and held with a qualifying third-party custodian — typically a CASP authorised under MiCA, a credit institution, or an investment firm. Self-custody by the issuer is not permitted.

EMT reserve mechanics

The EMT reserve rule takes a partially prescribed approach. The funds the issuer receives in exchange for issuing EMTs must comply with two conditions:

Component	Required allocation
Segregated credit-institution deposits	At least 30% of received funds
Other low-risk highly-liquid instruments	The remainder

The “highly liquid financial instruments with minimal market risk, credit risk, and concentration risk” referenced under the ART reserve investment rule is a specific category — government securities, money-market instruments, investment-grade corporate paper meeting strict liquidity criteria. Crucially, the non-deposit portion must be denominated in the same official currency as the EMT references.

A simplified EMT reserve worksheet:

EMT issued: 100M USDC-EUR
Total reserve required:        €100M

Minimum deposit requirement:    ≥30%  → ≥€30M in EUR-denominated
                                       segregated credit-institution
                                       deposit accounts
Remaining allocation:           ≤70%  → up to €70M in highly liquid
                                       low-risk EUR-denominated
                                       financial instruments

Currency-mismatch positions:    ZERO  — all reserves in reference currency

The 30% floor is a structural prudence requirement; the issuer cannot run a pure investment portfolio against EMT obligations. The currency-matching rule is what prevents EMT issuers from importing FX risk into an otherwise low-risk reserve.

Cited expert

In the EU, MiCA introduces stringent requirements for stablecoin issuers, including prudential and governance rules, as well as obligations regarding the composition and management of stablecoins reserves.

How does this map to issuer authorisation?

The two regimes use different authorisation pathways:

ART issuer (Title III):

• Direct authorisation from the home NCA under the ART authorisation rule onwards
• Subject to the ART own-funds rule own-funds rules, the ART reserve rule reserve rules, the ART redemption rule redemption rights
• A separate authorisation pathway from CASP authorisation; many ART issuers also need CASP authorisation for parts of their service stack
• Ongoing supervisory engagement with the home NCA

EMT issuer (Title IV):

• Issuer must be an authorised credit institution or EMI before issuing
• The MiCA white paper for the EMT is notified to the home NCA — there is no separate MiCA-specific authorisation gate
• Subject to the EMT marketing rule (interest prohibition), the EMT reserve rule (reserves), the EMT recovery rule (redemption)
• Supervisory engagement combines existing credit-institution / EMI supervision with MiCA-specific oversight

The EMT path is closed to firms that are not credit institutions or EMIs. A pure-tech stablecoin issuer cannot file under Title IV — it must either acquire/license-up to EMI status, or structure as an ART under Title III.

What’s the “significant” regime?

Both regimes have a “significant” tier with stricter rules:

Significant ART (the significant-ART threshold): Triggered by exceeding thresholds on customer base, market capitalisation, transaction count and value. Once classified as significant, the ART issuer moves to direct EBA supervision with enhanced prudential requirements — higher own-funds ratio, more stringent reserve composition, additional disclosure obligations.

Significant EMT (the significant-EMT threshold): Same trajectory — exceeding size and activity thresholds triggers direct EBA supervision and tighter rules.

The thresholds matter at the business-plan stage. An issuer projecting growth above the significant threshold needs to plan for EBA-grade governance, capital, and reporting capability from day one. Building to non-significant standards and uplifting at threshold-crossing is materially more painful than building to significant from launch.

The interest prohibition that catches issuers off guard

The ART conflicts-of-interest rule (for ARTs) and the EMT marketing rule (for EMTs) prohibit issuers from granting interest on tokens held by holders. The prohibition is structural — it blocks not just direct interest payments but also affiliated arrangements that economically equivalent interest:

• “Earn programmes” run by an affiliated CASP that pay holders for holding the issuer’s stablecoin
• Yield-bearing pools that pay distributions correlated with holding period
• Reward-token mechanics designed to track the underlying

The supervisory practice in 2025-2026 has been increasingly intolerant of these structures. Marketing copy that promises “yield on USDC”, “earn on EUR-stablecoin balances”, or “staking rewards on stablecoin holdings” is incompatible with MiCA’s structural design — even where the technical mechanics avoid the literal interest-payment form.

Working with counsel on a stablecoin reserve file

The diagnostic for counsel: ask how the firm’s typical reserve file is structured for an EMT vs an ART, and how the published the ART reserve rule policy is drafted. Counsel that has filed multiple stablecoin issuer applications will have calibrated views on supervisor expectations for reserve composition, custody arrangements, and the redemption-rights mechanics in the ART redemption rule (ART) and the EMT recovery rule (EMT).

The firms in our index with relevant stablecoin issuer experience are listed below.