Stablecoin Rules Boost Demand for Bills, Not Long Bonds

A federal regulatory framework requires permitted payment stablecoin issuers to hold one dollar of identifiable reserves for each token outstanding and limits eligible reserve assets to highly liquid, short-duration instruments. Allowed holdings include U.S. currency and Federal Reserve balances, withdrawable bank deposits, qualifying overnight repurchase agreements, government money-market funds invested in those instruments, and Treasuries with an original or remaining maturity of 93 days or less. The rule set channels reserves toward cash-like assets and front-end Treasuries rather than long-dated coupons.

The GENIUS Act was enacted in July 2025 and sets the reserve standard. The law’s general effective date is the earlier of Jan. 18, 2027, or 120 days after final implementing rules. The Office of the Comptroller of the Currency issued a proposal in February and indicated a final rule was expected by November.

Issuer reports show reserve allocations concentrated at the front end of the curve. Circle’s July assurance report put USDC circulation at about $71.8 billion with roughly $71.9 billion in reserve assets. Of those reserves, $60.7 billion were in the Circle Reserve Fund, including $52.7 billion in overnight Treasury repo and $7.2 billion in short-dated Treasuries; about $10.6 billion was held as cash at regulated banks. The Treasuries listed in Circle’s report had maturities within the 93-day limit.

Stablecoin issuance and redemption activity does not directly translate into fresh Treasury financing. Circle’s filings show $83.0 billion of USDC minted and $86.8 billion redeemed in the second quarter, producing $3.78 billion of net redemptions. Gross minting and redemption volumes measure activity but do not identify whether the dollars backing tokens are new offshore demand or funds moved from other cash-like instruments that already finance bills. The Treasury Borrowing Advisory Committee has noted that stablecoin issuance could add demand for short-maturity Treasuries while some demand may simply shift which balance sheet holds a bill.

Separately, the Treasury Department announced on Aug. 19 that it would raise the maximum size of liquidity-support buybacks for off-the-run nominal coupons in the 10- to 20-year and 20- to 30-year sectors from $2 billion to at least $4 billion per operation, lifting aggregate capacity for scheduled operations from $14 billion to at least $28 billion. The tentative calendar lists purchases on Sept. 10, Sept. 24, Oct. 1, Oct. 8, Oct. 15, Oct. 27 and Nov. 4. The Treasury described the program as providing dealers and investors a predictable outlet for older securities that may trade less readily than the newest issue.

Treasury buybacks retire accepted securities and are financed like other federal outlays; accepted offers increase retirements but do not reduce the government’s overall borrowing requirement unless the Treasury changes its issuance mix. The buybacks target liquidity and trading functioning in the long-end market; they do not draw on stablecoin reserves as direct purchasers because those reserves are limited to short maturities.

Empirical research on stablecoin flows finds effects concentrated at the front end of the curve. A Bank for International Settlements working paper using data through March 2026 estimated that a $3.5 billion stablecoin inflow lowered three-month bill yields by about 0.71 basis points on impact, roughly 4 basis points within 10 days and about 5 basis points at the trough, with larger effects under some stress conditions. The same analysis found limited or no spillover into longer maturities.

Links between stablecoin reserves, Treasury buybacks and risk assets operate through changes in short-term funding and market liquidity rather than direct reserve purchases of long-term bonds. Researchers have not produced a causal estimate tying stablecoin flows or the expanded buyback schedule to the price of Bitcoin. Long-term Treasury markets continue to depend on investors willing to hold duration; the 93-day reserve limit places stablecoin reserves outside the direct channel for 10-, 20- and 30-year debt.