Stablecoin issuers care about Treasury yields because much of the money backing USDT and USDC sits in short-term U.S. government debt. Higher yields increase the interest earned on those reserves, while Fed rate cuts reduce revenue per dollar held.
For large issuers such as Tether and Circle, even a 1 percentage point move in yields can translate into hundreds of millions or billions of dollars in annual income, making interest rates a major part of the stablecoin business model.
How Treasury bills turn stablecoin reserves into revenue
Dollar-backed stablecoins generally promise that users can redeem one token for approximately one U.S. dollar. To support that promise, issuers maintain reserves consisting of cash and highly liquid assets.
Short-term Treasury bills are particularly useful because they combine liquidity, relatively low credit risk and interest income.
Consider a simplified stablecoin issuer with $100 billion in interest-bearing reserves.
At a 5% average yield, those assets could generate roughly $5 billion in annual gross interest. At 4%, the figure falls to $4 billion. At 3%, it drops to $3 billion.
| Reserve portfolio | Average yield | Simplified annual interest |
|---|---|---|
| $100B | 5% | $5B |
| $100B | 4% | $4B |
| $100B | 3% | $3B |
| $100B | 2% | $2B |
The calculation is simplified because actual reserve portfolios include different instruments, maturities, fees and operating expenses. Still, it demonstrates why a relatively small change in short-term interest rates can materially affect an issuer’s economics.
The important distinction is that stablecoin holders normally do not receive this Treasury yield themselves. They hold a digital dollar designed to remain near $1, while the issuer earns income on the assets backing it.
That spread is one of the foundations of the stablecoin business.
Circle shows how rate changes affect revenue
Circle offers a particularly clear example because its financial statements disclose how USDC reserve income affects the business.
As USDC circulation expands, Circle receives more reserve assets that can generate interest. Rising stablecoin adoption can therefore increase revenue even without charging users traditional interest or subscription fees.
But the reverse side is interest-rate sensitivity.
If Treasury yields decline, each dollar in reserves produces less income.
This creates two forces working against each other:
More USDC circulation → larger reserve portfolio → potentially more interest income
Lower Treasury yields → less income generated by each reserve dollar
A stablecoin issuer can therefore continue growing its token supply while still experiencing pressure on reserve revenue if interest rates fall quickly enough.
This is why Fed decisions that appear unrelated to crypto can have direct consequences for companies built around digital dollars.
Tether has become a major Treasury investor
The same economic relationship applies to Tether, although its reserve structure and broader business differ from Circle’s.
USDT has grown into the world’s largest stablecoin, giving Tether control over an enormous reserve base. Much of that portfolio is invested in U.S. Treasury securities and other short-duration assets.
At that scale, Treasury income becomes substantial.
If an issuer maintains $150 billion in yield-producing reserves, for example, a move from a 4% yield to 3% represents approximately $1.5 billion less annualized gross interest, assuming the size and composition of the portfolio remain unchanged.
Tether also holds assets beyond Treasury bills, including gold and Bitcoin, so its profitability cannot be explained purely by interest rates. But government debt remains an important component of its reserve model.
That has turned stablecoin companies into increasingly significant participants in the Treasury market.
What happens when the Fed cuts rates?
Federal Reserve rate cuts usually push yields on short-term Treasury securities lower.
For stablecoin issuers, that means the reserve portfolio becomes less profitable unless another factor offsets the decline.
There are several possible responses.
Issuers can increase the amount of stablecoins in circulation, develop payment products, reduce expenses, expand internationally or build additional revenue streams.
Scale matters enormously.
A company earning 3% on $200 billion generates more gross interest than one earning 5% on $50 billion. Stablecoin competition is therefore not just about which token offers the best technology. It is also about distribution, circulation and reserve scale.
This helps explain why traditional banks, fintech companies and payment networks increasingly care about stablecoins. A widely adopted digital dollar can potentially create both transaction activity and a large pool of reserve assets.
For investors analyzing stablecoin businesses, token circulation alone is therefore not enough.
Three figures deserve particular attention:
stablecoin supply, average reserve yield and short-term Treasury rates.
Together, they reveal much more about the economics behind a supposedly simple $1 digital token.
