In a pivotal move set to redefine the regulatory landscape for digital assets, the European Central Bank (ECB) and national central banks across the European Union are championing a significant amendment to the Markets in Crypto-Assets Regulation (MiCA). Their proposal aims to abolish the current rigid requirement for stablecoin issuers to hold a fixed percentage (30% to 60%) of their reserves in traditional banks. Instead, they advocate for a more flexible, liquidity-centric approach, prioritizing asset maturity and ease of conversion to cash.

It’s crucial to note that these proposed changes are not yet in effect. This initiative is currently a formal consultation response submitted by the European System of Central Banks (ESCB), which includes the ECB and the 27 EU national central banks, to the European Commission. The journey from proposal to implementation will necessitate a comprehensive formal legislative process.

From “Where It’s Stored” to “How Quickly It Can Be Redeemed”

Under the existing MiCA framework, stablecoin issuers are mandated to deposit a minimum of 30% of their reserve assets with credit institutions. For stablecoins designated as “significant” due to their scale and potential impact, this threshold rises to 60%. The remaining reserves must be strategically invested in assets characterized by low credit risk, minimal market risk, and high liquidity.

The ESCB’s recommendation seeks to dismantle these fixed deposit ratios, introducing a dynamic system based on daily and weekly liquidity thresholds:

• Non-Significant Stablecoins: At least 20% of their assets must mature or be convertible to cash within one business day, with an additional 30% within five business days.
• Significant Stablecoins: The proposed daily and weekly thresholds are substantially higher, set at 40% and 60% respectively.

Eligible assets for these new liquidity requirements could encompass highly liquid instruments such as overnight reverse repurchase agreements and short-term sovereign bonds. This reform, therefore, isn’t about loosening reserve requirements but fundamentally shifts the regulatory focus. The emphasis moves from mandating where reserves must be held (i.e., in banks) to ensuring that stablecoin issuers possess the agility to swiftly meet redemption demands, regardless of the specific custodian.

Why Stablecoin Deposits Could Pose a Risk to Banks

The ESCB’s rationale extends beyond mere operational efficiency. They highlight a critical concern: when retail bank deposits are converted into stablecoins, and these funds are subsequently concentrated by issuers into a select few banks, the underlying structure of the banking system’s total deposits undergoes a significant transformation. What was once a relatively stable base of retail deposits morphs into more volatile institutional deposits, which are inherently more sensitive to market fluctuations and potential “bank runs.”

From a prudential perspective, current liquidity coverage ratio (LCR) calculations treat stablecoin issuer deposits held by banks with a 100% outflow rate. This regulatory stance compels banks to assume that these funds could be entirely withdrawn during periods of financial stress. Consequently, if a stablecoin experiences a sudden surge in redemption requests, its issuer might rapidly withdraw substantial deposits from banks. Such an event could trigger severe liquidity shortfalls for individual banks, potentially escalating into systemic risk across the broader financial system.

The 2023 Silicon Valley Bank (SVB) crisis serves as a stark, albeit inverse, illustration of this interconnected risk. When it was revealed that a portion of Circle’s USDC reserves was held at SVB, USDC temporarily de-pegged from the dollar and faced a significant redemption run. This incident vividly demonstrated the bidirectional nature of risk transmission between the traditional banking sector and the burgeoning stablecoin ecosystem.

Boosting the Competitiveness of Euro Stablecoins

Beyond mitigating banking sector risks, the proposed elimination of fixed deposit thresholds also aims to foster a more robust and competitive environment for Euro-denominated stablecoins. The ECB’s analysis points out a significant economic disincentive: in April 2026, the average yield on corporate deposits in the Eurozone was a mere 0.53%. Forcing stablecoin issuers to park substantial portions of their reserves in such low-yield bank accounts severely compresses their potential interest income, thereby undermining their business models and hindering the competitiveness of Euro stablecoins against their dominant USD counterparts.

The current market disparity is indeed striking. Latest data from DeFiLlama reveals a global stablecoin market capitalization of approximately $306.74 billion, with a 1.24% growth over the past 30 days. USDT alone commands a market cap of around $183.52 billion, representing 59.83% of the total, while USDC accounts for approximately $75.74 billion. Combined, these two US dollar-denominated stablecoins dominate roughly 84.5% of the entire market.

In stark contrast, Circle’s Euro stablecoin, EURC, holds a modest market capitalization of about $463 million. Furthermore, estimates from the Bank for International Settlements (BIS) suggest that nearly 98% of stablecoin value globally remains denominated in US dollars. This data underscores that despite MiCA establishing a pioneering and comprehensive regulatory framework, it has yet to significantly alter the entrenched market advantage enjoyed by US dollar stablecoins.

A Strategic Rebalancing: Benefits for Issuers, Nuances for Banks

The removal of fixed bank deposit ratios offers clear advantages for stablecoin issuers. It not only mitigates the risk of a stablecoin run directly impacting a single banking institution but also grants issuers greater flexibility. They can now strategically allocate more of their reserves into higher-yielding, highly liquid assets such as short-term government bonds or overnight reverse repurchase agreements. This approach enhances their potential returns and diversifies counterparty risk, fostering a more resilient reserve management strategy.

However, for the banking sector, the implications are more nuanced. While the proposal reduces the immediate risk of concentrated stablecoin deposit withdrawals, it could also lead to a gradual outflow of funds from the traditional deposit system into government bond markets. This shift might ultimately reduce the pool of low-cost funds available for banks to lend, potentially increasing their overall funding costs and impacting their lending capacity. Therefore, the ESCB’s proposal is not merely about “de-risking” banks but represents a strategic rebalancing act. It navigates the dual risks of sudden, concentrated stablecoin deposit withdrawals versus the long-term erosion of deposit bases, increased funding expenses, and diminished lending capabilities within the financial system.