When stablecoin issuers extend bond duration, the core conflict is this: buying long-term Treasury bonds locks in higher interest, but if suddenly many users redeem stablecoins, long-term bonds can't be liquidated instantly, causing a liquidity crunch. Tether and Circle have given completely different answers to this dilemma.
Step 1: Break Down What "Interest" and "Liquidity" Each Represent
Extending duration means issuers shift reserve assets from short-term Treasury bills to long-term bonds.
Interest side: Long-term bond yields are usually higher than short-term ones. When the yield curve uninverts, long-end rates tend to be higher. Circle's chief economist notes that the rise in 30-year yields is mainly driven by term premiums, currently around 80 basis points. Lengthening duration can theoretically lock in higher interest income.
Liquidity side: Stablecoin liabilities are redeemable at any time. Redemption regulations are tightening — the OCC's proposed rule requires that payment stablecoin redemptions normally take no more than 2 business days, but if daily redemptions exceed 10% of outstanding supply, the redemption period automatically extends to 7 calendar days. If your reserve assets are too long-dated, you might not be able to convert them in time during large-scale redemptions.
Step 2: How the Two Issuers Chose — the Tether and Circle Divide
Tether and Circle represent two completely different management philosophies.
Tether: "Profit first, accepting mismatch"
Weighted average maturity (WAM) of assets is around 60–90 days, including non-standard assets, so duration is relatively longer.
Redemption bar is high — direct redemption minimum is $100,000; deep secondary market trading absorbs most redemption pressure.
2024 net profit was about $13 billion, with the excess return from longer duration being an important profit source.
Approximately 83% of reserves are in U.S. Treasuries, totaling over $122 billion, making Tether a top-20 holder of U.S. Treasuries, around the level between Germany and Saudi Arabia.
Circle: "Compliance first, extreme matching"
Weighted average maturity (WAM) of assets is only 17 days, nearly daily liquidity.
Redemption channels are smooth, institution-friendly, promising near T+0 settlement.
2024 net profit was about $156 million, sacrificing some interest income for liquidity safety.
Subject to the GENIUS Act, which favors short-term Treasuries for stablecoins. Even without regulation, long-term bonds face larger haircuts in repos.
Common mistake: Many people think that all stablecoin issuers buy Treasuries, so risks are similar. But Tether allocates about 15% of assets to long-dated or non-standard instruments, creating a mismatch with the "redeemable at any time" liability. Circle's WAM is only 17 days. Their liquidity risk profiles differ by orders of magnitude.
Step 3: Weighing the Trade-off — Systemic Impact of Extending Duration
Extending duration doesn't just affect the issuer; it impacts the entire Treasury market.
Stablecoins are the "marginal buyer" of Treasuries. Circle's chief economist explicitly notes that stablecoins hold very short-dated assets, which frees up the Treasury to issue more short-term debt. On a duration-weighted basis, stablecoins effectively reduce the supply of long-duration dollars in the market, potentially easing upward pressure on long-end yields.
Standard Chartered predicts that by 2028, stablecoin market cap could reach $2 trillion, generating $800 billion to $1 trillion in new Treasury bill demand. If issuers collectively shift toward long-term bonds, that demand structure will change.
Redemption regulation is tightening the liquidity window. The OCC's proposed rule states that if daily redemptions exceed 10% of circulation, the redemption period automatically extends from 2 business days to 7 calendar days. This means that during mass redemptions, liquidity is forcibly delayed — a double squeeze for issuers with longer-duration assets: assets can't be sold, and redemptions are pushed back.
How to Verify the Strategy
To evaluate a stablecoin issuer's duration strategy, check two things:
Weighted average maturity (WAM) of reserve assets — Circle about 17 days, Tether about 60–90 days. The longer the WAM, the higher the liquidity risk.
Friction costs in redemption channels — Tether's direct redemption minimum is $100,000; Circle's institutional redemptions are smoother. Higher redemption friction allows the issuer to tolerate longer durations, but at the cost of a worse user liquidity experience.
Next step: Watch Tether's reserve reports and Circle's monthly attestations to see if WAM is changing. If Tether's WAM keeps rising, it means they are actively lengthening duration to lock in higher interest. If Circle's WAM surpasses 30 days, it could signal a shift toward "interest first" — a notable strategic pivot.
