Stablecoin reserve rules under the GENIUS Act push issuer cash into Treasuries maturing within 93 days, leaving the government's longer bonds outside that bid. Treasury is separately doubling its long-end buyback capacity from Sept. 9, a liquidity move unrelated to stablecoin reserves. Research cited in the report ties stablecoin inflows to lower short-term bill yields, with little effect further out the curve.
Stablecoin reserve cash can only reach Treasuries that mature within 93 days, plus cash, bank deposits and qualifying repo — a ceiling the GENIUS Act sets for permitted issuers. A newly issued 10-year note or 30-year bond falls outside that reserve category entirely.
Reserve rules keep the bid short
Implementation is still unfolding. The law was enacted in July 2025, but its general effective date is the earlier of Jan. 18, 2027, or 120 days after final implementing rules, and the Office of the Comptroller of the Currency said on Aug. 19 that its final rule was expected by November. Current issuer portfolios show how short-duration reserves work today; they don't establish that every issuer already operates under a completed federal regime.
Circle's reserves illustrate the pattern. Its July assurance report put USDC circulation at $71.826 billion and reserve assets at $71.904 billion on July 31, with $60.717 billion in the Circle Reserve Fund, including $52.723 billion of overnight Treasury repo and $7.179 billion of Treasuries maturing by Sept. 22. Circle customers also minted $83.004 billion of USDC and redeemed $86.784 billion in the second quarter, a net redemption of $3.780 billion despite circulation running 19% above a year earlier.
Long bonds get a separate liquidity push
Treasury's plan targets a different part of the curve. The department said it would raise the maximum size of each long-end buyback operation from $2 billion to at least $4 billion beginning Sept. 9, lifting aggregate capacity across seven scheduled operations from $14 billion to at least $28 billion. Treasury retires the securities it buys back and finances the purchases like other outlays, so the operation supports market liquidity rather than acting as new demand from stablecoin reserves.
A Bank for International Settlements working paper found that a $3.5 billion stablecoin inflow lowered three-month bill yields by 0.71 basis points on impact and roughly 5 basis points at the estimated trough, with longer maturities showing limited or no spillover. On Aug. 28, Treasury data put the 10-year yield at 4.73%, the 20-year at 5.21% and the 30-year at 5.22%, each maturity sitting beyond the GENIUS ceiling for direct reserve assets.
Bitcoin's link runs through rates, not reserves
Bitcoin's connection to this story stays indirect. Long-term yields can shape credit costs and investor appetite for risk, and a larger base of bill buyers can support Treasury's front-end financing, but the report finds no causal estimate linking stablecoin flows or the buyback schedule to Bitcoin's price. Stablecoins can still become a larger source of demand for Washington's bills, especially where growth reflects new dollar demand rather than money shifted out of existing bank deposits or money-market funds.
Source: CryptoSlate
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