US treasury relies on stablecoins to fund short-term debt, but they can’t fix its $28B long-bond problem

Stablecoin demand is becoming consequential in the U.S. government debt market, but the maturity of that demand matters more than the headline total.

Washington now has two debt-market stories running at once. The federal framework for permitted payment stablecoins channels reserves into cash-like instruments and Treasuries with no more than 93 days remaining. Farther out on the curve, the Treasury Department said on Aug. 19 that it would at least double the maximum size of liquidity-support buybacks in the 10- to 20-year and 20- to 30-year nominal sectors beginning Sept. 9.

Together, those developments test a broad claim about digital dollars funding the United States. Stablecoin growth can reinforce demand for bills and overnight Treasury financing. Direct support for long-duration bonds remains outside the reserve mandate, while any connection to Bitcoin runs through wider financial conditions rather than a reserve trade.

The 93-day wall defines the stablecoin bid

The GENIUS Act requires permitted issuers to maintain identifiable reserves of at least one dollar for every payment stablecoin outstanding. Eligible assets include U.S. currency and Federal Reserve balances, withdrawable bank deposits, Treasuries with an original or remaining maturity of 93 days or less, qualifying overnight repo and reverse repo, government money-market funds invested in those instruments, regulator-approved similarly liquid federal assets, and qualifying tokenized versions.