The SF Fed says stablecoin issuers could be sitting on about $400B of short-term Treasuries by end-2030, and my first reaction was that the number looks light.

Here's the setup. The paper is FRBSF Economic Letter 2026-26, out September 28. It says that if the recent trend continues, issuer demand for short-term Treasuries nearly doubles. "Nearly double" means today's holdings are already north of $200B. That's a big bid sitting in the front end, and most desks I talk to still treat it as a crypto footnote.

What the Fed Researchers Actually Found

Tether and USDC together are more than 80% of the market, and their Treasury holdings grew more than tenfold in five years. Over that stretch, issuers added roughly $200B, which covers more than 40% of what China shed.

Since 2023, issuers have also added more short-term paper than Japan, the biggest foreign holder. That one surprised me.

Foreigners held over 50% of Treasuries around 2008. Early 2026 sits near 30%. China's holdings have more than halved since the 2013 peak.

So the marginal buyer is changing. The issuers aren't buying long duration like the official sector did. They're buying bills because they have to meet redemptions at par.

Why I Think $400B Is the Low End

Look at how the number was built. Holdings grew tenfold in five years, yet the projection only doubles. That reads to me like a straight-line extension of dollars added, not compounding. It's my interpretation, because the letter doesn't spell it out, but the math points that way.

The other desks aren't shy. The Treasury's TBAC modeling floated up to $900B of extra bill demand if the stablecoin market hits $2 trillion by 2030. Standard Chartered has talked about roughly $1T of bill demand. Those are scenario numbers, not forecasts, and they depend on the regulatory path.

Still, the gap between $400B and those ranges is the whole debate.

Where the Bulls Get Ahead of Themselves

I'm not buying a clean "stablecoins eat the bill market" story.

• The SF Fed itself says $400B stays small against the government's financing needs.

• Reserves aren't all outright bills. Repo and deposits don't create the same marginal demand, and Citizens Bank's framework haircuts them accordingly.

• If a stablecoin holder was already buying bills, the issuer is a wrapper, not fresh money.

• Two issuers dominate the dataset. Add a bank-issued competitor and the extrapolation breaks.

• Issuer margins are rate-sensitive. Faster cuts squeeze the business even while bill demand holds.

The SF Fed also flags that cross-border rails from banks could eat the remittance use case. That's the risk I'd respect most.

What I'm Watching

I'm not quoting live yields or token prices here. The triggers are data, not chart lines.

• Aggregate stablecoin supply growth rate, not the headline cap.

• Tether and USDC attestations: bills versus repo versus everything else.

• GENIUS Act rulemaking and which issuers get approved.

• Monthly TIC data on Japan and China, to see whether the offset story holds.

• The 3-month bill yield and the rate-cut path.

Bullish Case

Supply keeps compounding, regulated issuers launch, and bill share in reserves climbs. In that tape, $400B is the floor and the $900B-plus scenarios start looking like real ranges.

Invalidation: two straight quarters of flat or shrinking aggregate supply, or the reserve mix drifting away from outright bills.

Bearish Case

Competition shows up. Bank products and faster payment rails take the remittance trade, rate cuts compress issuer yield, and a depeg forces redemptions. Redemptions mean issuers sell bills instead of buying them.

Invalidation: issuer bill holdings keep printing new highs while supply growth re-accelerates. That kills the competition story fast.

My Bias

I treat $400B as the conservative base case and supply growth as the real trade. Rising supply with rising bill share on the next two attestations keeps me constructive. Flat supply on both is when I step back.

Want the full breakdown and the watchlist I track? Read the original analysis on TechnoLoger Insights.

References

1. Leduc, S., Oliveira, L. E., and Sawyer, A. "Stablecoin Issuers' Growing Appetite for Treasury Securities." FRBSF Economic Letter 2026-26, Federal Reserve Bank of San Francisco, September 28, 2026. 

2. The Block. "Stablecoins could drive $1 trillion in T-bill demand, giving Treasury room to shift issuance: Standard Chartered." 

3. Insights4VC. "Stablecoins & T-Bills: A $900 Billion Demand Shock" (summary of the US Treasury Borrowing Advisory Committee's stablecoin analysis). 

4. Citizens Bank. "Stablecoins: Impact on U.S. Treasury Market." 

5. Bank for International Settlements, Annual Report 2025/26, as cited in the SF Fed letter above.

Disclaimer: This post is for educational and research purposes only and does not constitute financial advice. Always do your own research (DYOR).