Stablecoin reserves boost US short-term debt demand but leave long-term bonds untouched

Stablecoins, a type of cryptocurrency designed to hold a steady value, are increasingly supporting demand for short-term U.S. government debt under new federal rules. However, these rules do not extend to long-term bonds, leaving a $28 billion gap unaddressed.

The GENIUS Act, enacted in July 2025, requires stablecoin issuers to back each coin with reserves such as cash, bank deposits, or short-term Treasuries maturing in 93 days or less. This directs stablecoin demand toward the front end of the debt market, but not to longer-term bonds.

Short-term focus of stablecoin reserves

Under the GENIUS Act, permitted stablecoin issuers must hold reserves in highly liquid assets, including U.S. currency, Federal Reserve balances, or Treasuries with 93 days or less remaining until maturity. Longer-term bonds, such as 10-year or 30-year Treasuries, do not qualify as direct reserves.

Circle, a major stablecoin issuer, reported that its USDC reserves in July included $52.723 billion in overnight Treasury repo and $7.179 billion in short-term Treasuries, all maturing by September 22. An additional $10.607 billion was held as cash at regulated banks. These reserves demonstrate the focus on short-duration assets.

Treasury expands long-term buybacks

On August 19, the U.S. Treasury announced it would at least double the size of its liquidity-support buybacks for long-term bonds, targeting 10- to 30-year debt starting September 9. These operations aim to improve market liquidity but do not directly involve stablecoin reserves.

Confirmed effects and limits

Research from the Bank for International Settlements (BIS) shows that stablecoin inflows have lowered yields on three-month Treasury bills, confirming their impact on short-term debt. However, there is little evidence that this demand spills over to longer maturities.

Stablecoin growth and U.S. debt financing remain separate trends. Circle’s second-quarter report showed $83 billion in USDC minted and $86.784 billion redeemed, resulting in net redemptions of $3.78 billion. Despite this, circulation remained 19% higher than a year earlier.

Why this matters

The GENIUS Act’s reserve rules create a clear demand channel for short-term U.S. debt, but they do not address the Treasury’s challenges with long-term bonds. The Treasury’s expanded buybacks for long-term debt operate independently of stablecoin reserves, highlighting the distinct roles of these two mechanisms in the debt market.

What happens next

The GENIUS Act’s full implementation is pending, with a general effective date set for January 18, 2027, or 120 days after final rules are issued. The Office of the Comptroller of the Currency (OCC) expects to finalize its rule by November 2026. Meanwhile, the Treasury’s long-term buyback program will begin on September 9.

Sources

• CryptoSlate: US treasury relies on stablecoins to fund short-term debt, but they can’t fix its $28B long-bond problem
• GENIUS Act official statute
• Treasury announcement on buybacks
• Circle July USDC reserve report
• BIS working paper on stablecoin flows