Europe has begun regulating stablecoins as financial products. The harder question is what happens if people start treating them as money—and, increasingly, as an alternative to keeping savings in a bank.

The European Union’s Markets in Crypto-Assets Regulation, known as MiCA, introduced rules for stablecoin issuers from 30 June 2024. Those rules address authorisation, reserves and redemption. But regulating a token’s safety does not settle its wider economic effects.

For the European Central Bank, the stakes extend beyond crypto markets. If households and businesses shift substantial balances from euro bank deposits into privately issued tokens, especially dollar-pegged ones, they could change how banks fund lending and how ECB interest-rate decisions reach the economy.

That outcome is not inevitable. A stablecoin purchase does not automatically remove money from Europe’s banking system. The decisive questions are where the money goes, who controls it afterwards and whether the token becomes a payment tool or a lasting substitute for a euro balance.

Why deposits matter to the ECB

Bank deposits sit inside the machinery of monetary policy. When the ECB changes its policy rates, banks adjust the prices they pay for funding and charge borrowers. Those adjustments help influence consumption, investment and inflation.

The relationship is not mechanical. Banks differ in their funding sources, liquidity positions and competition for customers. But a sufficiently large migration out of retail deposits could change that relationship.

A bank losing deposits to stablecoins might attract customers back with higher rates, seek wholesale funding, sell assets or adjust its lending. Each response has a different cost. Stablecoin adoption could therefore intensify competition for deposits, alter banks’ margins or affect credit conditions.

The relevant issue is not simply whether the ECB’s influence becomes weaker. Monetary transmission could become faster in some channels, less predictable in others, or more sensitive to market funding conditions. The ECB would still set euro-area policy rates; what could change is the financial structure through which those rates take effect.

Follow the reserves, not just the token

Consider a customer who uses a euro bank balance to buy a stablecoin. The customer’s bank may lose funding, but that does not establish that the banking system as a whole has lost the same amount.

If the issuer holds the proceeds in another euro-area bank, deposits have moved between institutions. If it buys securities, the seller may receive money in a bank account. If the transaction involves conversion into dollars and reserves held abroad, the chain becomes more complex still.

The disappearance of a household deposit is not necessarily the disappearance of a deposit from the system.

Yet redistribution can matter even when aggregate deposits remain broadly unchanged. Thousands of relatively stable retail balances might be replaced by a concentrated deposit controlled by one issuer. Funding could move from banks that lend to local businesses towards a smaller group of reserve banks or custodians.

An issuer’s operational cash is also not necessarily as stable a funding source as household savings. Large redemptions could prompt rapid withdrawals.

This is why stablecoin market capitalisation alone is an inadequate measure of the threat to bank funding. Policymakers need to trace reserve assets, banking relationships and flows between currencies—not merely count tokens.

Dollar tokens raise a separate sovereignty question

A euro-pegged token and a dollar-pegged token may use similar technology, but they have different monetary implications.

For a euro-area user, a dollar stablecoin introduces exchange-rate exposure. Its reserve economics are generally tied to dollar assets and US interest rates. If it becomes a common savings vehicle, users may increasingly make financial decisions around conditions set outside the euro area.

Payment use is different. A business holding dollar tokens briefly to settle an international invoice is not necessarily abandoning the euro as its main unit of account. A household keeping a substantial share of its savings in dollar tokens is making a more consequential substitution.

The sovereignty concern becomes sharper if prices, contracts and recurring payments also migrate towards a foreign currency. At that point, Europe would face more than competition between payment technologies: it would face a shift in which currency anchors economic activity.

That is a possible trajectory, not an established consequence of stablecoin growth. Cross-border settlement volumes should not be mistaken for evidence that European households are replacing euro savings.

MiCA draws boundaries—but does not make every token equivalent

MiCA distinguishes between two principal stablecoin categories. An e-money token, or EMT, references a single official currency. An asset-referenced token, or ART, references another value or right, or a combination of them.

EMT issuance is restricted to credit institutions and electronic-money institutions. Holders have a claim against the issuer and a right to redemption at par. ARTs have their own authorisation, reserve and redemption requirements.

These protections are important, but a stablecoin is not automatically equivalent to an insured bank deposit. Its legal safeguards, custody arrangements and redemption process must be assessed on their own terms.

MiCA also prohibits issuers and crypto-asset service providers from granting interest in relation to ARTs and EMTs. The prohibition extends beyond a payment explicitly labelled “interest”: benefits linked to how long a token is held can also fall within its scope.

That makes “yield-bearing stablecoin” an imprecise description. A return might come from a separate lending arrangement, an investment product or another structure with a different legal classification. The token, the service and the source of the return must be examined separately.

For users, the distinction is fundamental. A product offering yield may introduce credit risk, withdrawal restrictions or exposure to an intermediary that is absent from simply holding a redeemable token. A familiar digital interface does not make those risks disappear.

Redemption is where the structure gets tested

Stablecoins promise stability, but confidence depends on holders believing they can recover the underlying value when they need it.

During heavy redemptions, an issuer may have to draw down bank balances or sell reserve assets. The consequences depend on the assets’ liquidity, the speed of withdrawals and the size of the issuer relative to the markets involved.

A token can also trade below its reference value even when redemption rights exist. Access may depend on intermediaries, operational capacity or eligibility requirements. Users buying through a platform need to understand both their rights against that platform and any rights against the issuer.

Cross-border arrangements complicate the picture further. Issuance, custody, trading and reserve management may involve different entities in different jurisdictions. Regulation must therefore be matched by supervision that can identify who owes the money, who holds the assets and who bears losses under stress.

Europe needs evidence—and competitive euro payments

The ECB’s most useful dashboard would connect stablecoin activity to the conventional financial system: holders’ residence, payment versus savings use, reserve locations, redemption patterns, bank deposit flows and funding costs.

Without those links, two opposite mistakes are possible. Policymakers could dismiss an emerging funding shift because stablecoins remain small globally, or overstate disintermediation because token issuance is growing quickly.

Europe’s response also cannot rest on restrictions alone. Demand for stablecoins can reflect shortcomings in existing payments: limited availability, slow cross-border transfers or difficulty integrating money into digital services. Addressing those shortcomings is part of preserving the euro’s relevance.

The ECB’s digital euro project belongs to that wider debate, although a digital euro would itself require safeguards against disruptive shifts out of bank deposits. Public digital money is not a substitute for analysing private tokens’ funding effects.

The central question is therefore not whether Europe should accept digital money. It is whether useful innovation can develop without making euro-area finance more dependent on opaque intermediaries or foreign-currency infrastructure.

Stablecoins would become a monetary-policy concern not merely by growing, but by changing where Europeans keep their money, which currency they trust and how banks finance the economy. Following those connections is the difference between monitoring a new technology and understanding a change in Europe’s financial plumbing.