1. Reinforcement of USD Dominance

The Bank for International Settlements (BIS) research indicates that stablecoin capital flight dynamics reinforce rather than threaten USD dominance in DeFi and the global economy. While these assets pose a severe threat to the monetary sovereignty of emerging market and developing economies (EMDEs), they have effectively "digitally dollarized" the DeFi ecosystem, cementing the US dollar as its primary settlement asset.

1. Reinforcement of USD Dominance

Contrary to concerns that stablecoins might erode the dollar's role, the BIS finds they have become the primary vehicle for "synthetic dollarization."

• Market Concentration: As of mid-2026, 99.4% of stablecoins by market value are USD-denominated [Source: https://www.bis.org/publ/arpdf/ar2026e.htm].
• DeFi Reserve Asset: USD stablecoins function as the "reserve currency" of DeFi, serving as the dominant trading pairs and the most common collateral for lending protocols.
• Treasury Demand: Major issuers (such as Tether and Circle) have become significant holders of US Treasury bills. The US GENIUS Act of 2025 has further codified this by encouraging dollar-pegged stablecoins as a strategic tool to extend USD dominance [Source: https://www.whitehouse.gov/fact-sheets/2025/07/fact-sheet-president-donald-j-trump-signs-genius-act-into-law/].

2. Capital Flight and Monetary Sovereignty

The BIS identifies stablecoins as a "digital bank run" mechanism that specifically threatens non-US currencies.

• Evasion of Capital Controls: Stablecoins are "largely unaffected" by traditional capital controls. Residents in volatile economies can instantly swap local currency for dollar tokens, bypassing FX restrictions more effectively than traditional bank deposits [Source: https://www.bis.org/publ/work1363.htm].
• Loss of Policy Traction: The BIS warns that once "digital dollarization" occurs, it is historically difficult for central banks to reverse, leading to a permanent loss of control over domestic monetary policy [Source: https://www.bis.org/publ/bppdf/bispap170.htm].
• Yield-Bearing Risks: The growth of yield-bearing stablecoins—from under $1 billion in 2023 to over $19 billion by September 2025—has accelerated capital flight by offering attractive dollar-denominated returns that local banks cannot match [Source: https://www.bis.org/publ/bisbull108.htm].

3. Comparative Data: Stablecoin Impact Metrics

4. Regulatory and Macro Countermeasures

To mitigate the risks of capital flight while maintaining financial stability, the BIS advocates for a "Unified Ledger" approach. This would integrate tokenized central bank reserves and commercial bank money into a single regulated framework, providing a "safe" alternative to unregulated stablecoins.

While the BIS remains concerned about the macroeconomic impact—noting that stablecoins could slightly decrease bank lending by increasing funding costs—the primary "threat" is to the stability of EMDE currencies rather than the dominance of the USD in DeFi [Source: https://www.bis.org/publ/work1363.htm].

Conclusion: BIS concerns regarding capital flight do not threaten USD dominance in DeFi; instead, they highlight how stablecoins have exported USD hegemony into digital markets at the expense of smaller sovereign currencies. The primary unresolved risk remains whether a $1-3 trillion stablecoin market cap would eventually destabilize US bank funding channels.