Stablecoin issuers hold Treasuries like banks, but GENIUS Act does not regulate them like banks

The US stablecoin market settled between $300 billion and $310 billion by mid-2026, down from a May peak near $320 billion. Tether's USDT accounts for roughly $184 billion of that, Circle's USDC for about $74 billion. Combined, the two largest issuers hold on the order of $260 billion in reserves, a meaningful share of it in short-term US Treasury bills. That makes them large enough to matter to the Treasury market's plumbing — and the regulatory framework now covering them was not built with that scale in mind.

What the GENIUS Act actually requires

Signed in July 2025 and fully in effect since July 18, 2026, the GENIUS Act requires stablecoin issuers to back their tokens one-to-one with cash, insured bank deposits, or short-term US government securities. It explicitly bars issuers from paying interest directly to token holders — a provision aimed at stopping stablecoins from competing directly with bank deposits for yield-seeking money. On paper, 100% reserve backing sounds more conservative than fractional-reserve banking. In practice, it recreates a specific kind of fragility that bank regulation spent a century building tools to manage, without importing any of those tools.

The mismatch: bank-like scale, non-bank rules

A bank facing a wave of withdrawals can borrow from the Federal Reserve's discount window, and its depositors are protected up to $250,000 by FDIC insurance regardless of what happens to the bank's balance sheet. A stablecoin issuer facing a wave of redemptions has neither backstop. Its only defense against a run is the speed at which it can convert reserve assets into cash, and short-term Treasuries, while liquid in normal conditions, are not instantly convertible at face value during a market-wide liquidity crunch — the exact scenario in which a stablecoin run would most likely occur.

The GENIUS Act's 100% reserve requirement reduces the risk of insolvency compared to pre-2025 stablecoin structures, several of which held commercial paper, corporate bonds, and other less liquid assets. Tether's reserves still include some secured loans and precious metals alongside Treasuries, which is part of why Tether launched a separate, US-focused coin, USAT, through Anchorage Digital Bank, with Cantor Fitzgerald as reserve custodian — a structure built specifically to meet GENIUS Act requirements more cleanly than Tether's existing global USDT reserve mix.

Why this matters beyond crypto

A combined $260 billion sitting in short-term Treasury bills is not a rounding error against the roughly $6 trillion T-bill market, but it is large enough that a sudden, forced liquidation — triggered by a loss of confidence in an issuer rather than any change in the underlying assets — could show up as a liquidity event in short-term funding markets. That is a different risk profile than a bank run, which is contained by deposit insurance and lender-of-last-resort facilities. It is closer to a money market fund run, which is exactly the comparison that prompted money market reform rules after 2008 and again after a near-miss in March 2020. Stablecoins are now large enough to warrant the same category of scrutiny, and the GENIUS Act, for all its reserve requirements, does not include it.

What to watch

The next real test is not a hack or a depeg from bad assets — GENIUS Act reserve rules make that less likely than in the pre-2025 era. It is a confidence-driven redemption wave hitting during a period when Treasury market liquidity is already thin, the kind of overlapping stress that regulators spent 2020 and 2023 learning to watch for in other corners of short-term funding markets. Circle remaining the only issuer with an authorized e-money token license under the EU's MiCA framework, versus Tether's patchwork of jurisdiction-specific entities, is worth tracking as a proxy for which issuer is better positioned to survive a forced redemption event without a fire sale.