Stablecoin Issuers Bought $200B in Treasuries, Covering 40% of China's Exit

Since 2023, two crypto companies have added more short-term US government debt than Japan. That's not a typo, and it's not a rounding error.

Tether and Circle, the issuers behind USDT and USDC, have grown their Treasury securities and repurchase-agreement holdings by roughly $200 billion over the past five years, according to new research out of the Federal Reserve Bank of San Francisco. That single figure covers more than 40% of the decline in China's Treasury holdings over the same stretch. Beijing's pile peaked in late 2013 and has fallen by more than half since, landing near $600 billion by mid-2026.

Meanwhile, stablecoin issuers' Treasury holdings have climbed more than tenfold in five years. Read that again. Ten times.

What the Fed actually found

The composition of America's creditor base has been shifting for years, and the numbers are blunt. Foreign investors held more than half of outstanding Treasury securities around 2008. By early 2026 that share had dropped to roughly 30%. Within that shrinking group, foreign governments matter even less than they used to, accounting for just above 40% of foreign Treasury demand in early 2026 compared with nearly all of it at their peak in the 1970s.

Private buyers filled the gap. That's not automatically good news for Washington, because private investors aren't central banks. They can walk, or demand higher yields, when fiscal risk looks worse or competing returns look better.

Stablecoin issuers behave differently. Their business model requires large pools of liquid dollar assets backing tokens that customers redeem at par, any day, without warning. So they buy bills. They hold cash, bank deposits, and repos. Tether and Circle together accounted for more than 80% of stablecoin market capitalization as of mid-August, which means the reserve decisions of two private companies now register in the world's deepest bond market.

Since 2023, stablecoin issuers have added more short-term Treasury holdings than Japan, the single largest foreign holder of US government debt. The San Francisco Fed also points to Bank for International Settlements research suggesting that demand is now large enough to measurably move short-term government bond yields. So who's actually financing the US deficit at the margin right now? Increasingly, it's a token issuer in El Salvador and a payments company in Boston.

Regulation is about to make that structural. The GENIUS Act, adopted in 2025, created a federal framework requiring approved US payment stablecoin issuers to fully back outstanding tokens with eligible liquid reserves. Proposed implementing rules list Treasury bills, notes and bonds with remaining maturities of 93 days or less, plus cash, bank deposits and certain Treasury-backed repurchase agreements.

That's a legislative floor under bill demand. And the economics work beautifully for issuers. Customers hold tokens that pay them nothing, while the issuer collects the interest on the Treasuries sitting behind those tokens. As circulation grows, reserve portfolios grow and so does the income. It's one of the cleanest spreads in modern finance, and it's now blessed by federal statute.

The maturity gap nobody's pricing

Here's where the China comparison falls apart. Beijing sold mostly longer-dated debt. Stablecoin issuers buy almost exclusively at the very short end. Growing reserves can deepen demand for bills without creating a single equivalent buyer for ten-year notes.

That distinction matters more than the headline $200 billion suggests. Federal debt held by the public has climbed from about 35% of GDP in 2006 to roughly 100% today. The Treasury needs buyers across the whole curve, not just the part the Fed targets with its policy rate. Stablecoin reserves are a genuine source of demand, but they're a bill-market story dressed up as a sovereign financing story, and conflating the two lets policymakers off the hook on duration.

My first take: this is a geopolitics story wearing a fintech costume. Stablecoin issuers are quietly becoming a quasi-sovereign buyer of US debt, and that buys them something no lobbying budget can. It buys them protection. Brussels, Washington, and Hong Kong are drawing different lines, but the direction in Washington is one-way now. More licensing, more harmonization, fewer exits. The 93-day maturity cap is America's line, and it's designed to keep reserves parked exactly where the Treasury wants them.

My second take, and the more uncomfortable one: the short end is where monetary policy actually transmits. If stablecoin growth stalls, whether from competing bank settlement rails, tougher rules abroad, or just a shift in user behavior, Treasury loses a marginal buyer precisely where the Fed operates. That's a real channel from crypto markets into rate dynamics, and it runs in both directions.

Who wins? Tether and Circle, obviously, but also the US Treasury at the short end, and the money market funds now competing with issuers for the same bills. Who loses? Banks. Every dollar that migrates from a deposit account into a stablecoin is a dollar of cheap funding that walks out the door, and banks building their own cross-border settlement tools are now competing against issuers who hold a regulatory moat nobody handed them by accident.

The growth path is the open question. The Fed researchers note heavy stablecoin usage relative to economic output across Africa, the Middle East and Latin America, much of it crossing national borders, which is how a user in Lagos or Buenos Aires indirectly finances US government borrowing. Extend the recent growth rate and those holdings approach $400 billion by 2030. The researchers are upfront that the estimate carries serious uncertainty, and they should be. Jurisdictional arbitrage is accelerating. MiCA compliance is forcing hard choices for European issuers on reserve composition, and those choices will decide which entities hold which assets.

The takeaway

Capital follows clarity, and right now the clearest rulebook on earth says a dollar stablecoin must be backed by something maturing in 93 days or less. That's not a compliance footnote. That's a standing bid for Treasury bills, written into law, funded by retail users in emerging markets who never once thought of themselves as buyers of US government debt.

The stablecoin industry spent a decade arguing it deserved a seat at the table. It got one. The strange part is that the table turned out to be the Treasury auction.