USDT Peg Stability
As a Fiat-Backed stablecoin, USDT is designed to maintain a $1.00 peg at all times. Peg stability is the most critical metric for any stablecoin — a persistent de-peg can trigger a loss of confidence, mass redemptions, and cascading liquidations in DeFi protocols that depend on the token.
How USDT Maintains Its Peg
Each USDT token is backed by reserves held by Tether Limited, composed of US Treasury bills, cash, cash equivalents, and other assets per quarterly attestations by BDO Italia. Users deposit USD to an authorized exchange or directly to Tether, which mints an equivalent amount of USDT on the requested chain. To redeem, users send USDT to Tether, which burns the tokens and wires USD minus a 0.1% fee. The peg is maintained by authorized arbitrageurs who mint when USDT trades above $1 and redeem when it trades below.
Common De-peg Causes
During extreme market volatility, selling pressure on USDT can exceed available buy-side liquidity on exchanges. This causes temporary downward deviations until arbitrageurs step in to buy discounted tokens and redeem for $1 from Tether Limited.
Negative news about Tether Limited, questions about reserve adequacy, or regulatory actions can cause holders to sell, pushing USDT below $1.00 on secondary markets even if reserves are fully intact.
Failures of other stablecoins (e.g., UST/Luna collapse) or crypto lenders can cause panic selling across all stablecoins, including USDT, as holders flee to fiat. These events typically resolve as USDT's peg mechanism operates.
Monitoring the Peg
Track USDT peg deviations in real-time using the BTC.PH Depeg Monitor. Set alerts for deviations below $0.995 or above $1.005 to react quickly to potential instability.