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Follow the Float: Stablecoin Reserves, the National Debt and Who Gets Paid

Stablecoin reserves really do buy Treasuries. But the interest goes to issuers, distributors and the Treasury, not altcoin holders. An engineer's look at where the float goes.

Ryan Cwynar7 min read

Elliot (@elliotrades) posted a thesis today that's going around my feed. The headline: "Absolutely NO ONE is talking about how the National Debt is creating the next 1000X opportunity for ALTCOINS."

Half of it I'd sign. Stablecoin reserves have become a real buyer of short-term US Treasuries, and that matters more once the GENIUS Act takes effect. Where I get off is the last step, the idea that this demand flows through to altcoin holders.

I've built issuer-side systems: mint, redeem, reserve reconciliation. So I want to walk through the plumbing. Follow the float and the money ends up somewhere specific. It isn't your wallet.

The thesis, fairly

Here's the chain as I read it, from the post and his video:

  • The US has more than $40 trillion of debt, and interest now costs more than $1 trillion a year.
  • Foreign official buyers are pulling back, so Washington needs a new buyer.
  • Stablecoins are that buyer. In his words: "For the first time the US has a FORCED buyer of their debt in STABLECOINS."
  • About $300 billion of stablecoins isn't enough to matter, so the system needs a lot more. Tokenizing stocks and other assets gets you there, because every on-chain trade settles against a stable dollar.
  • The on-chain venues that clear that flow capture the upside.

In the video, the "1000X" mostly describes how much the tokenized asset market would have to grow. The headline turns that into an altcoin call.

The macro part holds up. Total public debt was $40.24 trillion on October 2. Net interest outlays for fiscal 2026 through August came to $1.017 trillion, more than the $834.9 billion spent on Defense Department military programs over the same 11 months. The 10-year Treasury yield closed at 5.28% on October 2, its highest since 2002.

So I don't dispute the problem. My disagreement is about mechanics.

What stablecoin reserves actually buy

Someone sends an issuer $100 and gets 100 tokens. The issuer now owes $100 to whoever holds those tokens, so it keeps at least $100 of safe assets against that liability. That pile is the float.

GENIUS spells out what can go in it:

  • cash, Fed balances and demand deposits
  • Treasuries with 93 days or less left to maturity
  • overnight repo and reverse repo backed by Treasuries
  • government money market funds that hold those things
  • tokenized versions of the same

Issuers have to publish the reserve mix every month and have it examined.

So "forced buyer" is close, but not quite. Treasuries are one item on a menu. Bills are the natural pick because they pay, they're liquid, and they mature fast enough to cover redemptions. The actual reserve reports are more mixed than the slogan:

  • Circle's USDC reserves on August 31 were roughly 68% Treasury repo, 18% Treasuries held directly and 14% cash.
  • Tether reported $114.96 billion of T-bills on June 30, plus about $25.6 billion of reverse repo.

The law isn't in force yet, either. It takes effect on January 18, 2027, or 120 days after final regulations, whichever comes first.

From the systems side, a reserve is a ledger you reconcile every day. Tokens outstanding on one side. Cash, bills and repo on the other, laddered so you can pay redemptions on a bad day. It's boring on purpose. I went deeper on that in are stablecoins safe.

The demand is real, but small so far

Treasury Deputy Secretary Brooke said on September 22 that stablecoin providers "already own nearly $200 billion of Treasury bills and other close-to-maturity Treasury securities." That's real money, and the estimate comes from Treasury itself.

Now the scale. Bills outstanding were $7.12 trillion at the end of September, so stablecoins hold roughly 2.8% of the bill market. In July and August, net bill supply rose by more than $550 billion, and money market funds absorbed about 85% of it, per the same speech. The Fed has bought more than $300 billion of bills this year.

Meanwhile, total stablecoin supply is about $314 billion today, up 4% from $302 billion a year ago.

Does it move rates? A BIS working paper found that a large stablecoin inflow (two standard deviations, about $3.5 billion) pushes 3-month bill yields down by about 4 basis points within 10 days, bottoming around 5 basis points at day 13. The effect sits in short-term bills, with little or no spillover to longer maturities. The authors also find it has grown as the sector has scaled, which is a point for Elliot.

That's the honest version of "stablecoins help finance the debt": a small discount at the short end of the curve. The long end, where 5.28% hurts, gets little or none of it.

Treasury's own borrowing advisory committee also flagged substitution. If stablecoins replace bank deposits or money fund shares, some of that bill demand just replaces demand that would have come through those products anyway. To be fair, much of the committee was more optimistic and saw it as a source of new demand.

Follow the float

Here's the part that matters for the altcoin question. Say stablecoin supply grows a lot. Who gets paid?

Walk one dollar through it:

  1. You buy $1,000 of a stablecoin. The issuer gets $1,000 of cash.
  2. The issuer puts it into bills, repo or a government money fund. The 3-month bill yielded 4.01% on October 2.
  3. The interest lands on the issuer's income statement.
  4. The issuer shares a chunk with the exchanges, wallets and apps that bring in balances.
  5. You hold a token worth $1. GENIUS bars the issuer from paying you "any form of interest or yield" solely for holding it.

Circle's second-quarter 10-Q shows the whole float economy in three lines:

  • reserve income: $667.7 million, on a 3.5% reserve return rate
  • total revenue: $701.3 million
  • distribution and transaction costs: $410.4 million

Almost all of the revenue is interest on reserves, and distribution and transaction costs equal well over half of it. The float pays the issuer and the partners who bring in balances. Tether reported about $1.5 billion of second-quarter net operating profit, which it said was led by Treasuries and repo.

Then the Treasury collects its piece: slightly cheaper short-term financing. Banks and custodians pick up deposits, custody and repo business.

Where is the altcoin holder in that chain? Nowhere.

A stablecoin is a dollar product. Its whole job is to not go up. The reserve income stays inside the regulated perimeter, with the issuer and its partners. That's the reason everyone wants to be a stablecoin issuer. And when a product does offer you yield on stablecoins, it's coming from somewhere else, as I covered in stablecoin yield explained.

There's one more plumbing detail people miss. Every stablecoin dollar sitting in bills or repo is collateral parked in the Treasury market, not money buying tokens. More stablecoins can mean more dry powder on-chain. It doesn't mean anyone deploys it into a given token.

Where Elliot could still be right

The strongest version of his case isn't really about the debt. Stablecoins are the settlement asset for tokenized markets. If tokenized stocks and funds trade on open venues, those venues earn fees on volume, not on float. That's a real business model.

The engine can also run fast. Stablecoin supply went from $233.7 billion in April 2025 to $302.3 billion in October 2025. If growth like that comes back after GENIUS takes effect, it's worth paying attention.

But that's a different claim from "the national debt is a 1000x for altcoins." It depends on whether tokenized assets trade on open rails or on permissioned ones run by big institutions, and on volume actually showing up. Today, tokenized real-world assets distributed on-chain total about $38.8 billion, per rwa.xyz. The debt doesn't route money to those venues. Adoption would.

What I'm watching instead

  • Total stablecoin supply. The high was $322.4 billion on May 17.
  • Reserve mix in the monthly reports. Are bills growing relative to repo and cash?
  • Stablecoins' share of the bill market versus money funds and the Fed.
  • GENIUS rulemaking. Treasury's comment period closes October 19 and the Fed's closes November 30.

If those move, the Treasury-demand story gets stronger. That still makes it a story about issuers and the bill market.

FAQ

Do stablecoins buy Treasuries? The large dollar stablecoins hold much of their reserves in short-term Treasuries or Treasury-backed repo. Treasury estimates stablecoin providers hold nearly $200 billion of bills and other near-maturity Treasuries.

Are stablecoins required by law to buy US debt? Not exactly. GENIUS requires 1:1 reserves from a menu of safe assets that includes cash, deposits, short-dated Treasuries, repo and government money funds. It takes effect by January 18, 2027.

Who earns the interest on stablecoin reserves? The issuer, which often shares it with distribution partners. GENIUS bars issuers from paying holders interest or yield just for holding the coin.

Does more stablecoin demand help altcoins? Not through the reserves. Reserve income goes to issuers, partners and, indirectly, the Treasury through cheaper short-term borrowing. Any benefit to an on-chain venue would come from fees on actual trading volume.

The plumbing

Elliot is pointing at something real. Stablecoins are becoming part of how the US finances its short-term debt. But the float is a dollar business, and the interest stops at the issuer. If you want to know who wins when stablecoins grow, read the reserve report and the income statement.

My own view, not my employer's. This is general education, not investment advice.

  • #stablecoins
  • #stablecoin reserves
  • #treasuries
  • #national debt
  • #genius act
Ryan CwynarFull-stack developer and AI automation consultant, writing from Medellín. If this was useful, I also build this kind of thing for clients.Work with me →