What Are Stablecoins and USDT? Understanding Dollar Pegs

USDT is designed to maintain a value near $1 per token. Unlike volatile Bitcoin, it seeks lower price variation and serves as a reference currency for trading and transfers.

What is a stablecoin?

A stablecoin is a cryptocurrency designed to peg its price to a particular asset. Most track the U.S. dollar near $1 per coin. While Bitcoin can move 5–10% in a day, a stablecoin aims to minimize such price fluctuations.

Two widely used examples are Tether's USDT and Circle's USDC. The original guide describes USDT as the largest by trading volume and USDC as relatively regulation-oriented. Both aim to track the dollar 1:1.

How is a dollar peg maintained?

USDT and USDC use fiat-backed reserves. The structure aims to hold approximately $1 of cash, short-term government securities or similar reserves for each token. Eligible users can redeem at 1:1, creating arbitrage pressure toward $1 when the market price deviates.

Not all stablecoins are cash-backed. Some use other cryptocurrencies as collateral; others attempt to adjust supply algorithmically without equivalent collateral. Algorithmic structures can be especially vulnerable to peg failure.

Uses in trading and transfers

Stablecoins act as a reference currency in crypto markets.

• Trading pairs: Exchanges commonly quote pairs such as BTC/USDT. Converting a volatile holding to USDT reduces exposure to that coin's price while waiting.
• International transfers: Blockchain transfers can take minutes with relatively low fees compared with bank transfers that may take days.
• Derivatives settlement: Margin for leveraged trading and funding payments are often denominated in USDT.

Korean investors also compare USDT prices to assess domestic versus international price gaps such as the kimchi premium.

Depegging: When $1 does not hold

“Stable” does not mean risk-free. A substantial deviation from the target is called depegging.

1. Reserve confidence: Doubts about sufficient backing can trigger mass redemptions or a run.
2. Algorithmic collapse: TerraUSD, or UST, used an algorithmic structure in 2022. After its peg failed, it fell from $1 to nearly zero within days.
3. Temporary shocks: During the U.S. banking crisis in 2023, inaccessible portions of USDC reserves contributed to a temporary fall to around $0.87 before recovery.

Stablecoins are useful for reducing volatility, but trust in the issuer and reserve structure is central to their value. Examine that information and diversify custody rather than assuming the label eliminates risk.