ECB Official Warns Stablecoins Could Import Market Vulnerabilities

Stablecoins could shift household funds out of commercial bank accounts and into privately issued digital tokens, weakening a stable, low-cost source of funding for lenders. European Central Bank Executive Board member Piero Cipollone sees the risk as broader than bank profitability: widespread use of foreign-currency stablecoins could also increase the euro area’s reliance on non-European payment providers and erode monetary sovereignty.

Cipollone recently warned that continued stablecoin growth would eat into banks’ retail deposit base, echoing concerns raised by US banking groups about deposit flight. He said a digital euro would help preserve banks’ central role in Europe’s payments ecosystem. The ECB plans to begin a pilot in the second half of 2027, though it has not disclosed a monetary amount for the program or set a date for a full public launch.

Stablecoins maintain their value using fiat currency and short-term assets. If funds move from retail deposits to nonbank issuers, banks would become more reliant on costlier and more volatile wholesale funding. European Central Bank Working Paper No. 3199, published in 2026, said euro-area companies depend heavily on bank credit. Deposit substitution would therefore constrain lending and disrupt the transmission of policy rates to households and businesses.

On May 22, 2026, ECB President Christine Lagarde opposed a Bruegel proposal to ease euro stablecoin rules and give issuers access to ECB funding during an informal meeting of EU finance ministers in Nicosia, Cyprus. Stablecoins already have a market capitalization exceeding $300 billion. Under current MiCAR rules, at least 30% of reserve assets must be deposited with banks, rising to 60% for significant issuers. The ECB warned that easing the rules could raise banks’ funding costs and reduce lending.

Stablecoins maintain their value through reserves such as U.S. dollars and short-term Treasury securities, but are issued and redeemed by private companies including Tether and Circle. They fall outside the Federal Reserve’s management of the money supply and lack both bank-deposit insurance and central-bank lender-of-last-resort support. Wall Street Journal columnist Greg Ip therefore described them as “private money,” warning that panic-driven redemptions could force issuers to sell Treasury bills, disrupting short-term interest rates and the transmission of monetary policy.

A May 26, 2026, report said the global stablecoin market had surpassed $200 billion, while the issuers of USDT and USDC held more than $150 billion in U.S. Treasury securities and reverse-repurchase agreements. Tether had about $113 billion in assets, with more than 80% allocated to instruments including Treasury securities. The U.S. GENIUS Act became law on July 18, 2025, while the EU’s MiCA rules have applied since December 30, 2024, establishing contrasting market-led and prudential-regulation approaches.

The stablecoin market has grown from less than $10 billion to more than $300 billion over the past six years, with about 98% denominated in U.S. dollars. Although the European Union brought stablecoins under its Markets in Crypto-Assets Regulation, or MiCAR, in 2024, the European Central Bank is concerned that private money could displace bank deposits and weaken monetary-policy transmission. Stablecoins may therefore do little to enhance the euro’s international standing.

On May 8, 2026, ECB President Christine Lagarde told a Bank of Spain forum that tokenized settlement should be backed by central bank money. The Eurosystem will launch Pontes in September 2026. The initiative tested 50 transactions across nine jurisdictions in 2024, settling about €1.6 billion. Appia, meanwhile, aims to achieve interoperability by 2028.