Stablecoin adoption could start to matter for the real economy in a very “boring” way: by draining bank deposits, reshaping credit supply, and making monetary policy less predictable. That’s the core argument in a new ECB Working Paper on stablecoins and monetary policy transmission.
The authors use a mix of stablecoin market data, public attention measures, and confidential euro area bank data to map how stablecoins can affect bank intermediation—and why foreign-currency stablecoins could raise monetary sovereignty risks.
Deposit substitution is the first domino
The paper’s first finding is a “deposit-substitution” channel: as stablecoins grow, funds can move out of retail bank deposits and into digital assets. In their framework, that shift pushes banks to rely more on wholesale funding, which is typically less stable and more expensive than deposits—ultimately constraining intermediation capacity.
Using a Bayesian VAR approach and a proxy for stablecoin adoption based on public attention (Google Trends), the authors find that a stablecoin “attention” shock associated with higher stablecoin market cap coincides with a decline in the retail-to-total deposit ratio and a contraction in bank lending to firms.
Stablecoins can change how rate hikes flow through banks
The second finding is about transmission mechanics. The ECB paper argues that stablecoin adoption can alter the pass-through from policy rates to bank funding costs and lending conditions—potentially weakening the predictability of policy actions.
Importantly, the authors say these effects are nonlinear: at low levels of adoption, the aggregate impact is limited, but it can rise sharply as stablecoins scale and become closer substitutes for retail deposits. They also stress that outcomes depend on stablecoin design and regulatory treatment.
Foreign-currency stablecoins raise the sovereignty risk
The third finding is a warning about stablecoins denominated in currencies other than the euro. If foreign-currency stablecoins (for example, USD-pegged coins) became an important medium of payment in the euro area, the paper argues this could “import” foreign monetary conditions into domestic liquidity and spending conditions—weakening domestic policy control and reducing the informational value of euro monetary indicators.
In practical terms, the paper suggests that stablecoin growth isn’t just a payments story; it can become a macro story if it reshapes what people hold as “money” and how banks fund themselves.
The market is growing fast, and expectations are wide
The paper notes the stablecoin market’s rapid expansion (around $300B market cap in the period discussed) and highlights how analyst expectations for future growth vary widely. It also emphasizes how concentrated the market is—USD-pegged stablecoins dominate global issuance, with euro-denominated stablecoins still a small segment.
That concentration matters for regulators because the “design features” and governance of a small number of issuers can heavily influence system-wide outcomes.
Why it matters for crypto
- Stablecoins aren’t just trading collateral; at scale, they can compete with bank deposits and affect credit supply.
- If deposits migrate, banks may lean more on wholesale funding—changing risk, cost of capital, and lending behavior.
- Monetary policy transmission could become less predictable as bank liability structures shift.
- Foreign-currency stablecoins could amplify “currency substitution” dynamics and weaken monetary sovereignty in the euro area.
- Regulation and design choices (reserves, redemption, treatment) shape whether stablecoins behave like “safe money” or a fragile substitute.
What to watch next
- Signals of stablecoins being used beyond crypto trading—especially in payments, treasury, and settlement at meaningful scale.
- EU policy and supervisory moves that target deposit-substitution and bank funding risks as stablecoins grow.
- Growth in euro-denominated stablecoins versus continued USD dominance inside Europe.
- Bank disclosures showing rising reliance on wholesale/foreign-currency funding tied to crypto or stablecoin activity.
- Further ECB research quantifying thresholds where stablecoin adoption shifts from “negligible” to macro-relevant.