European Central Bank President Christine Lagarde has warned that large stablecoins such as Tether and USDC could destabilize financial markets, urging regulators to pay close attention to a sector now worth $310 billion. Her remarks, delivered during a recent ECB forum, singled out the two biggest dollar-pegged tokens as potential conduits for stress transmission during market turmoil.
A $310 billion market in the crosshairs
Stablecoins have grown to dominate the crypto economy, with Tether and USDC alone accounting for the bulk of the market. These tokens are designed to maintain a one-to-one peg with fiat currency, typically the U.S. dollar, by holding reserves in traditional assets like Treasuries, commercial paper, or cash equivalents. But Lagarde argued that size alone makes them a systemic concern. “When a stablecoin reaches the scale of Tether or USDC, its stability becomes a matter of financial stability,” she said.
The $310 billion figure covers all stablecoins globally. That’s larger than the market capitalization of many national stock exchanges. The two largest, Tether (USDT) and USD Coin (USDC), together represent roughly 80% of that total, according to industry data cited in her presentation.
How stablecoins could transmit stress
Lagarde’s warning centered on a specific vulnerability: the risk that a sudden rush to redeem stablecoins could force fire sales of the underlying assets. During periods of panic — such as a credit crunch or a crypto crash — holders might dump tokens all at once. To meet redemptions, issuers would have to liquidate large chunks of their reserve portfolios, potentially hammering prices in the Treasury or commercial paper markets.
“The stress doesn’t stay inside crypto,” Lagarde said. “It transmits to the real economy through the very assets meant to back these coins.” She pointed to the May 2022 collapse of TerraUSD’s algorithmic stablecoin as a cautionary tale, though she noted that Tether and USDC are different because they claim to hold actual reserves. Still, she questioned whether those reserves would be sufficient in a coordinated sell-off. “We don’t know how deep the liquidity is until we test it,” she added.
Regulatory gaps remain
Despite years of debate, no global framework fully governs stablecoins. The European Union’s Markets in Crypto-Assets (MiCA) regulation, set to take full effect in 2025, imposes reserve and transparency requirements. But Lagarde admitted that enforcement remains uneven. “We have the tools in Europe, but the market is global,” she said. “A stablecoin issued in one jurisdiction can stress a Treasury market in another.”
The ECB president stopped short of calling for an outright ban. Instead, she urged regulators to treat large stablecoins like systemically important financial institutions — subjecting them to capital buffers, stress tests, and disclosure rules similar to those applied to banks. “The size alone justifies the scrutiny,” she said.
Tether and USDC have both faced questions about the composition and quality of their reserves in the past. Tether settled with the New York Attorney General’s office in 2021 over claims it misrepresented its backing. USDC’s issuer, Circle, has pursued a banking charter and publishes monthly attestations, but those reports are not full audits.
Next steps for regulators
The European Commission is expected to release a review of MiCA’s stablecoin provisions later this year. Lagarde indicated that the ECB will push for tighter rules on reserve disclosure and redemption rights. Meanwhile, the Financial Stability Board is working on international guidelines for stablecoin oversight, due for finalization by the end of 2024.
Whether those measures will satisfy Lagarde’s concerns — or whether the market will continue to grow faster than the rules — remains an open question.
