Stablecoins’ money is quietly changing the U.S. Treasury market—but not as dramatically as you might think

The GENIUS Act locks stablecoin reserves into short-term Treasuries and cash within a 93-day window. In other words, when issuers hold your money, they can only buy three-month Treasury bills. Long-term U.S. Treasuries are off-limits.

On the other side, the U.S. Treasury Department announced that starting in September, it will at least double the buyback (repo) size limits for long-term bonds with maturities of 10 to 30 years.

One line is stablecoins getting squeezed into the short end; the other is the government doubling down in the long end. The two tracks simply don’t line up.

Research also shows that stablecoin inflows do indeed suppress the three-month Treasury bill yield—but they have almost no impact on long-term bonds.

So don’t believe the hype: “digital dollars” are not saving the Treasury market. They’re only propping up the short end. The long-end hole still has to be filled by someone else.

The logic behind this is worth thinking about.

Stablecoin reserve requirements are fundamentally “safety first,” not “yield first.” And that explains why big issuers like USDC hold almost all their positions in short-term Treasuries and cash—not because they don’t want long-term bonds, but because the rules don’t allow it.

For the crypto industry, this is actually good news.

By locking stablecoins into safe assets, this market is becoming more like a legitimate financial sector rather than a ticking time bomb that could blow up at any moment. It may be slower—but it’s steadier. And steadiness is itself the biggest narrative.

Going forward, when you see stablecoin news, ask one question first: what maturity of assets is the money actually buying? The answer matters far more than total size. That’s the right way to understand the relationship between U.S. Treasuries and crypto.

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