Stablecoins Boost Short‑Term Treasury Funding but Remain Outside Long‑Bond Market

Stablecoin demand is becoming a noticeable source of financing for the U.S. government’s short‑term debt, yet the regulatory framework limits that demand to assets that mature in 93 days or less. At the same time, the Treasury announced a significant increase in its buyback program for 10‑ to 30‑year nominal bonds, a market segment that stablecoins cannot directly support.

Short‑Duration Reserve Requirements

The GENIUS Act mandates that permitted stablecoin issuers hold reserves equal to one dollar for each stablecoin in circulation. Eligible reserve assets include cash, Federal Reserve balances, bank deposits, Treasury securities with an original or remaining maturity of 93 days or less, overnight repo and reverse‑repo transactions, and approved tokenized equivalents. The rule, enacted in July 2025, will take effect on the earlier of January 18 2027 or 120 days after final implementing rules are issued.

Circle’s Reserve Composition

Circle’s latest filing shows a reserve fund of $71.9 billion, of which $60.7 billion is in short‑duration Treasury repo and $7.2 billion in Treasury securities, all maturing by September 22. An additional $11.2 billion is held as cash at regulated financial institutions. This composition keeps Circle’s exposure firmly in the front‑end of the Treasury market.

Impact on Short‑Term Treasury Yields

A BIS working paper found that a $3.5 billion inflow into stablecoins lowered three‑month Treasury bill yields by roughly 0.7 basis points on impact, with the effect growing to about 5 basis points at its peak. The study observed little to no spillover to longer‑term yields.

Long‑Bond Liquidity Support

On August 19, the Treasury announced it would at least double the maximum size of its liquidity‑support buybacks for 10‑ to 20‑year and 20‑ to 30‑year nominal coupons, raising the ceiling from $2 billion to $4 billion per operation. The schedule includes seven operations between September 10 and November 4, potentially increasing total capacity from $14 billion to $28 billion.

Why Stablecoins Can’t Fill the Long‑Bond Gap

Stablecoin reserves are restricted to short‑duration assets and therefore cannot be used to purchase the older, off‑the‑run securities targeted by the Treasury’s buyback program. While stablecoin inflows may increase demand for Treasury bills, the Treasury’s overall borrowing requirement remains unchanged, and each dollar bought back must be financed by new issuance.

Implications for Bitcoin and Broader Markets

The link between stablecoin activity and Bitcoin prices is indirect. Stablecoin‑driven compression of bill yields does not automatically translate into lower long‑term yields, which are more influential on risk‑on assets like Bitcoin. Consequently, the evidence does not support a direct causal relationship between stablecoin growth, the Treasury’s long‑bond buybacks, and Bitcoin price movements.