Stablecoins are supposed to be the safe, stable piece of crypto. But the very thing that keeps them pegged to $1 - short-term Treasury bills - could become the source of a shock in money markets. If millions of users redeem at once, issuers must sell those T-bills fast, and that selling can ripple through the broader financial system.
How Stablecoin Runs Work
If holders cash out a stablecoin tied to fiat currency, the issuing entity must obtain U.S. dollars. If their readily available cash and overnight reserves fall short, they turn to their next-most-liquid assets: short-term Treasury bills and reverse repo agreements. The specific timing and scale of withdrawals are crucial during a run, as the process of converting redemptions to asset sales compels the issuer to offload extra Treasury bills or borrow against them with increasing haircuts.
Additional selling drives up Treasury bill yields. Money market funds and dealers respond, bid-ask spreads widen, and the expense of obtaining cash increases precisely as redemption requests accelerate. That can weaken the stablecoin's peg, which can trigger even more redemptions - a feedback loop.
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The Bank for International Settlements (BIS) looked at this risk. A $30 billion fire sale would cut returns by 6.4 basis points. Those seem small, but in a market where traders watch every fraction, they add up fast.
The stablecoin market has expanded significantly over the past few years, driven by demand for dollar-denominated assets in decentralized finance and cross-border payments. At $313.2 billion, stablecoins now represent a sizable portion of the broader crypto ecosystem, and their reliance on Treasury bills creates a direct link between crypto markets and short-term government debt. This interconnection has drawn increased scrutiny from central banks and regulators, who worry that a sudden redemption wave could amplify stress in traditional money markets.
The Numbers Behind the Risk
As of late June 2026, the entire stablecoin market was worth $313.2 billion, per DeFiLlama. That is down slightly from roughly $320 billion at the end of May 2026, according to the BIS Annual Economic Report. The two largest players dominate: Tether (USDT) at $184.9 billion and USD Coin (USDC) at $73.9 billion.
If either one faced a major confidence shock, redemptions could quickly reach tens of billions. The BIS study shows even a fraction of that would move markets.
Regulators are paying attention. The NCUA, together with other federal regulators, introduced a proposal for Customer Identification Program requirements tailored to authorized stablecoin issuers, accompanied by a 60-day public comment period.
What to Watch
Investors and regulators are tracking four key signals: stablecoin market caps, on-chain redemption data, the gap between 3-month T-bill yields and the Federal Reserve's overnight reverse repo rate, and issuers' reserve reports and primary dealer bill auction metrics. A sudden drop in market cap or a spike in redemptions would be the first warning.
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