Stablecoins are becoming an increasingly important source of demand for short-term US government debt, but their rules and investment patterns mean they are unlikely to provide direct support for the Treasury market’s longer-dated bonds.
The US is dealing with two separate debt-market developments. Under the federal framework for permitted payment stablecoins, issuers must hold reserves in cash-like assets and US Treasuries with no more than 93 days remaining until maturity.
At the longer end of the market, the Treasury Department said on 19 August 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 from 9 September.
The two measures test the wider argument that digital dollars could help finance the United States. Stablecoin growth may strengthen demand for Treasury bills and overnight financing, but the reserve rules do not allow direct support for long-duration debt. Any effect on Bitcoin would instead come through broader financial conditions rather than a direct stablecoin reserve allocation.
The GENIUS Act requires permitted issuers to maintain identifiable reserves worth at least one dollar for every payment stablecoin in circulation. Eligible assets include US currency, Federal Reserve balances, withdrawable bank deposits, Treasury securities with an original or remaining maturity of 93 days or less, qualifying overnight repo and reverse repo, and government money-market funds invested in those assets.
The rules also allow other similarly liquid federal assets approved by regulators, along with qualifying tokenised versions of those instruments. But the framework remains focused on liquidity and short maturities. Newly issued 10-year notes and 30-year bonds are outside the direct Treasury reserve category.
Implementation of the legislation is still under way. The law was enacted in July 2025 and will generally take effect on the earlier of 18 January 2027 or 120 days after final implementing rules are published. The Office of the Comptroller of the Currency issued its framework as a proposal in February, while the Comptroller said on 19 August that the final OCC rule was expected by November.
Existing issuer portfolios illustrate how short-duration reserves operate in practice, although they do not show that every issuer is already governed by a completed federal regime.
Circle offers a current example. Its second-quarter filing put USDC circulation at $73.269bn on 30 June. A more detailed assurance report published in July recorded $71.826bn in circulation and $71.904bn in reserve assets on 31 July.
Of those reserves, $60.717bn was held in the Circle Reserve Fund. That included $52.723bn in overnight Treasury repo and $7.179bn in Treasury securities. A further $11.187bn was held outside the fund, mostly as $10.607bn in cash at regulated financial institutions.
Every direct Treasury security listed in the report matured by 22 September. The repo holdings involved lending cash against Treasury collateral. Both categories kept Circle’s exposure concentrated at the short end of the market.
That shows both the potential scale and the limits of the stablecoin bid. More USDC in circulation could direct additional cash towards Treasury bills, repo or bank deposits, depending on how each issuer allocates its reserves. Long-term coupon-bearing bonds remain outside the direct channel.
Stablecoin growth and new federal financing should also not be treated as the same thing. During the second quarter, Circle customers minted $83.004bn of USDC and redeemed $86.784bn, producing net redemptions of $3.780bn. Even so, circulation at the end of the quarter was 19% higher than a year earlier, although it was about $2bn below December’s level.
Gross issuance measures the amount of activity, while even net growth does not reveal where the underlying dollars came from.
The Treasury Borrowing Advisory Committee, a private-sector group that advises the department on debt management, has made a similar distinction. Stablecoin issuance could create additional demand for short-maturity Treasury securities, but some of that demand could simply replace deposits, money-market funds or other cash-like assets that already help finance bills.
Demand from new offshore dollar users would be more additive, although official evidence does not quantify how large that share is. In practice, stablecoins could change which balance sheet owns a Treasury bill without creating an entirely new lender for every dollar added to the token market.
Treasury buybacks target the long end
The Treasury’s planned operations focus on older, less frequently traded nominal securities in the 10-to-20-year and 20-to-30-year sectors. The department has described the programme as a liquidity measure intended to give dealers and investors a predictable outlet for bonds that may be harder to trade than the latest issue.
The tentative schedule includes seven long-end operations on 10 September, 24 September, 1 October, 8 October, 15 October, 27 October and 4 November. Raising the maximum size of each operation from $2bn to at least $4bn increases the combined potential capacity from $14bn to at least $28bn.
That $28bn is only a ceiling. Treasury’s buyback guidance sets the minimum size of an operation at zero and allows the department to accept less than the maximum if submitted offers are judged unattractive.
The programme is also different from quantitative easing. Treasury retires the securities it buys back and finances those purchases as part of its normal outlays. With other factors unchanged, every dollar spent on buybacks requires another dollar of Treasury issuance.
The department can choose whether that new issuance is concentrated in bills or longer-dated coupons. If more of the financing is conducted at the front end, stablecoin demand could absorb part of the bill supply. However, the government’s overall borrowing requirement would remain, and stablecoin reserves would not become direct buyers in the long-bond buyback operations.
Research by the Bank for International Settlements supports the distinction between maturities. A working paper using data through March 2026 found that a $3.5bn stablecoin inflow reduced three-month bill yields by 0.71 basis points immediately, by about four basis points within 10 days and by roughly five basis points at the estimated trough.
The effect was stronger in some periods of market stress and when Treasury bills were scarce. The same research found limited or no spillover to longer maturities. That result is consistent with the assets stablecoin issuers are permitted to buy: money is placed in securities maturing within weeks, while investors in 10-, 20- and 30-year debt continue to bear duration risk.
Treasury data published on 28 August provide current market context, but not proof of cause and effect. The 10-year yield stood at 4.73%, the 20-year yield at 5.21% and the 30-year yield at 5.22%. All three maturities are well beyond the GENIUS Act’s 93-day limit for direct Treasury reserve assets.
Those yields reflect a range of forces. They do, however, identify the area of the curve where a direct stablecoin reserve bid is absent.
No automatic Bitcoin signal
The most credible connection with Bitcoin runs through wider financial conditions. Long-term Treasury yields can affect borrowing costs, the discount rates applied to risky assets and investors’ willingness to hold volatile positions.
Improved trading conditions in older Treasury bonds could help market functioning, while a larger pool of buyers for bills could support the government’s short-term financing. But those links form a possible macroeconomic channel, not a mechanical price signal.
Stablecoin inflows could push bill yields lower without reducing long-term yields. Treasury buybacks could improve liquidity without lowering the government’s net borrowing. Bitcoin may react to movements in interest rates, dollar liquidity and risk appetite, while also being influenced by many unrelated factors.
The evidence does not establish a causal link between stablecoin flows, long-end Treasury buybacks, long-term yields and the price of Bitcoin. It therefore offers no fixed prediction for BTC based either on stablecoin growth or the expanded buyback schedule.
The narrower conclusion is that stablecoins could become a larger source of demand for US Treasury bills, particularly when growth reflects new demand for dollars. The market for long-term government bonds still depends on investors willing to hold duration, leaving Treasury’s liquidity operations and Bitcoin’s broader financial-conditions channel separate from the regulated stablecoin reserve system.
Liam Wright, also known as “Akiba”, is a reporter, podcast producer and Editor-in-Chief at CryptoSlate. He believes decentralised technology has the potential to make significant changes.
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