For decades, the biggest holders of U.S. government debt were predictable: China, Japan, and major European economies. That changed in 2025, when a new and unlikely group of buyers muscled their way into the top ranks: private crypto firms.
Stablecoin issuers such as Tether and Circle now hold more U.S. Treasuries than many foreign governments, including Germany and South Korea. In aggregate, the stablecoin industry is the 18th largest external holder of Treasuries, with Tether alone reporting more than $100 billion in short-term U.S. debt. Circle, which went public in June and whose USDC stablecoin has surged 90 percent in market capitalization over the past year, has joined Tether as one of the largest new financiers of American borrowing.
The numbers are still small compared to the $7 trillion U.S. money market fund sector, but they are growing quickly. Apollo, an asset manager, projects the stablecoin industry could reach $2 trillion by 2028. That growth raises an urgent question: what does it mean when private companies issuing digital tokens suddenly become major players in U.S. fiscal stability?
Stablecoins were once dismissed as speculative playthings of the crypto market, used mainly for trading Bitcoin and Ethereum. Their design is straightforward: each token is pegged to a fiat currency, usually the U.S. dollar, and backed by reserves that typically include cash and U.S. Treasuries. This peg gives traders the convenience of moving in and out of crypto markets without exposure to volatility.
But the appeal of stablecoins is spreading. Transaction volumes surpassed Visa in early 2024, according to industry data. Advocates point to their low fees, instant settlement times, and borderless functionality as superior to legacy systems like SWIFT, especially for international transfers. That argument has left the crypto echo chamber and entered the corporate boardroom. Stripe, the fintech giant, spent $1.1 billion last year acquiring a stablecoin startup, a signal that Fortune 500 companies see the tokens as part of the future of payments.
The result is that stablecoin reserves now include massive amounts of U.S. Treasuries. In effect, stablecoins have become a new kind of financial plumbing: digital tokens on one end, short-term government debt on the other.
The U.S. government depends on steady demand for its Treasuries to fund operations and service debt. Traditional buyers such as China and Japan have recently signaled that they may reduce their holdings. Into that gap have stepped crypto firms, which some policymakers welcome as a convenient new source of demand.
“Having stablecoin issuers always be there is a massive boost in terms of giving confidence to the Treasury about where to place debt,” said Yesha Yadav, a professor at Vanderbilt Law School. Others argue the demand could even help lower long-term interest rates.
Yet critics see risks. Stablecoins could siphon deposits away from banks, which rely on those deposits to make loans. They could also concentrate short-term Treasuries in the hands of firms with little track record of managing systemic risk. If a major stablecoin issuer faltered, the ripple effects could extend far beyond crypto markets.
“There’s a lot of hype, and the numbers are still tiny compared to what we see in normal traditional finance,” said Kim Hochfeld, global head of cash and digital asset at State Street. “While I don’t deny this is the start of a big trend, the numbers are still not enough to make us either super excited or super nervous.”
For Igor Volovich, Executive Director of Strategy at America First Technology Infrastructure & Innovation Institute (America First Tech), the problem is not only about financial risk. It is about who gets to write the rules for the next era of economic infrastructure.
“When private companies like Circle and Tether hold more U.S. debt than most foreign governments, we cannot keep pretending stablecoins are still a fringe issue,” Volovich said. “Stablecoins are no longer speculative tech, they are becoming critical components of American and global financial infrastructure. That disconnect has real consequences.”
If stablecoin issuers are major players in U.S. debt markets, Volovich argues, then policymakers cannot afford to leave oversight vague. “If these firms are now major players in U.S. debt markets, then the real question is: Who gets to write the rules? Without U.S.-anchored frameworks, we risk outsourcing financial sovereignty to whoever moves fastest.”
Supporters say the growth of stablecoins could consolidate dollar dominance, extending U.S. influence abroad in ways reminiscent of the eurodollar system of the mid-20th century. Critics warn that the unintended consequences could include financial instability, credit disruptions, or new vulnerabilities in the Treasury market.
Either way, stablecoins are no longer an abstract experiment. They are now significant holders of U.S. government debt, with the potential to shape both domestic financial stability and America’s global economic leverage.
The United States faces a strategic decision. It can craft clear, U.S.-anchored rules that align stablecoins with national priorities and safeguard systemic stability. Or it can continue to treat them as a fringe asset class until the market grows too large to ignore.
As Volovich frames it, the stakes are less about crypto hype and more about sovereignty. The choice is whether the next chapter of financial infrastructure is designed in Washington, or simply inherited from whoever gets there first.
