BlockRiver Blog | ECB Warns Stablecoins May Disrupt Monetary Transmission: EMIs Face a Closing Window on Cross-Border Infrastructure

The European Central Bank doesn't publish working papers about theoretical risks. When ECB staff release a document titled "Stablecoins and Monetary Policy Transmission," drawing on macroeconomic and bank-level data across the euro area, they're signalling that stablecoins have graduated from regulatory curiosity to systemic concern.

The paper's findings are direct: rising interest in stablecoins correlates with declining retail bank deposits and reduced lending to firms. The mechanism is straightforward, as households and firms move funds from bank accounts into stablecoins, banks lose access to their cheapest, most stable funding source. When deposits shrink, banks shift toward wholesale funding, which is more expensive and more volatile. Credit supply contracts. The ECB's transmission mechanism, the way interest rate changes ripple through to households and businesses, becomes less predictable.

But the paper's more pointed concern involves currency composition. Roughly 97% of global stablecoin market capitalisation is denominated in U.S. dollars. If dollar-backed stablecoins gain traction in the eurozone, the ECB warns, "foreign monetary conditions could be 'imported' into the euro area through stablecoins." U.S. interest rate decisions and global risk sentiment would begin to influence European liquidity conditions, a scenario that erodes monetary sovereignty precisely when central banks need control most.

This isn't speculative. The stablecoin market has crossed $312 billion in capitalisation, up from roughly $140 billion two years ago. Transaction volumes reached $33 trillion in 2025, more than 20 times PayPal's annual throughput. Visa's stablecoin settlement programme hit a $3.5 billion annualised run rate by late 2025, with active pilots across Europe, Latin America, and Asia-Pacific. Mastercard has enabled USDC and EURC settlement for acquirers across Eastern Europe, the Middle East, and Africa, and recently partnered with SoFi to explore stablecoin settlement for card transactions across its global network. The card networks aren't experimenting anymore, they're building production infrastructure.

The European response is taking shape. In September 2025, nine major banks. ING, UniCredit, Banca Sella, KBC, Danske Bank, DekaBank, SEB, CaixaBank, and Raiffeisen Bank International, announced a consortium to develop a MiCA-compliant euro-denominated stablecoin. The consortium has formed a company in the Netherlands seeking e-money institution licensing from the Dutch Central Bank, with a targeted launch in the second half of 2026. The explicit goal: provide a European alternative to the dollar-dominated stablecoin market and preserve Europe's "strategic autonomy in payments."

Meanwhile, the U.S. has moved from regulatory uncertainty to active encouragement. The GENIUS Act, signed into law in July 2025, established the first comprehensive federal framework for payment stablecoins. The legislation permits insured depository institutions and licensed nonbanks to issue stablecoins under Federal Reserve and OCC oversight, with 1:1 reserve requirements backed by U.S. Treasuries or equivalent low-risk assets. The regulatory clarity has prompted major banks, including those in Europe, to accelerate their stablecoin strategies.

For EMIs, the competitive landscape has shifted materially. Under MiCA, e-money tokens are subject to Title IV provisions that have applied since June 2024. Only credit institutions or electronic money institutions are permitted to issue EMTs in the EU. This means EMIs already hold the regulatory architecture to participate in euro stablecoin infrastructure, but the architecture alone doesn't create capability. Settlement rails, custody arrangements, and cross-border payment corridors require execution and integration that many fiat-focused EMIs haven't built.

The problem isn't regulatory permission. The problem is timing. Corporate treasury clients managing multi-currency exposures increasingly expect 24/7 settlement finality, programmable payments, and the ability to move value across jurisdictions without the latency of correspondent banking. Neobanks and crypto-enabled payment service providers have been building these capabilities under existing MiCA and e-money frameworks. Traditional EMIs that remain fiat-only are watching cross-border flow migrate to competitors who can settle in both currencies and stablecoins.

The ECB paper frames the policy challenge in terms of monetary sovereignty and financial stability. But for EMIs, the more immediate translation is commercial: if central bankers now acknowledge stablecoins as systemic enough to alter monetary transmission, then the "wait and see" posture many boards have adopted isn't risk mitigation, it's strategic delay.

The institutional clients who most need hybrid settlement capability, corporates with cross-border supply chains, treasury operations spanning multiple time zones, or settlement requirements that don't fit banking hours, are precisely the clients driving the stablecoin volume growth the ECB is tracking. They're not waiting for their EMI to develop a stablecoin strategy. They're finding providers who already have one.

The nine-bank consortium developing a euro stablecoin won't launch until late 2026. Visa and Mastercard are actively onboarding acquirers for stablecoin settlement now. The GENIUS Act implementation timeline puts full U.S. regulatory clarity in place by early 2027 at the latest. Circle already holds EMI authorisation in France under MiCA. The infrastructure is being built. The question for EMIs is whether they'll participate in building it, or become dependent on others who did.

The ECB's recommendations for mitigating stablecoin risk include stronger transparency requirements, robust redemption guarantees, and adequate capital buffers. These are the compliance requirements EMIs already navigate. What the paper doesn't say, but implies, is that regulated European institutions have an opportunity to shape how stablecoins integrate into the euro area financial system, if they move before that opportunity closes.

The regulatory window is open. The competitive window is narrowing. EMIs that build cross-border stablecoin infrastructure now position themselves as the institutions through which corporate treasury clients access both fiat and digital settlement. Those that don't will watch that flow move to institutions that already made the decision.