The European Central Bank (ECB) has issued a stark warning that the rising adoption of stablecoins poses a significant risk to the traditional banking system and monetary policy effectiveness within the eurozone. In a new working paper titled “Stablecoins and Monetary Policy Transmission,” ECB staff detailed how growing stablecoin use is linked to measurable declines in retail bank deposits, which in turn can reduce lending to firms and weaken the transmission of monetary policy.
The core mechanism identified is a deposit substitution effect, where households and companies move funds from traditional bank deposits into digital currency tokens pegged to major fiat currencies. “Banks rely heavily on deposits as a stable and low-cost source of funding,” the authors noted. As this cheap funding base erodes, banks may be forced to turn to wholesale funding markets, which are typically more expensive and carry higher volatility. This shift can tighten bank liquidity buffers, increase funding costs, and ultimately restrict the supply of credit to the real economy, making the pass-through of central bank policy rates less predictable.
The ECB emphasized that the impact is nonlinear and varies based on the scale of adoption, stablecoin design, and regulatory treatment. The paper states, “We find that stablecoin adoption interferes with multiple monetary policy transmission channels,” potentially weakening the predictability of policy actions.
Adding another layer of concern is the dominance of US dollar-pegged stablecoins in the market. Citing CoinGecko data, the report notes that dollar-backed tokens account for approximately $301 billion, or about 97% of the total stablecoin market capitalization. The ECB warned that widespread use of foreign-currency stablecoins could weaken the link between domestic monetary policy and bank lending conditions, challenging monetary sovereignty in the euro area, especially during periods of financial stress.
The warning comes amid rapid market growth, with the stablecoin sector's capitalization having more than doubled over the past three years to over $300 billion. Projections suggest the market could reach a staggering $2 trillion by 2028, a trajectory the ECB is closely monitoring for systemic risks to the eurozone banking system.
