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What is USDT Tether stablecoin

What is USDT (Tether): The World's Most Used Stablecoin

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With over $80 billion in circulation, USDT (Tether) is the world’s most used stablecoin and the third-largest digital asset by market cap. But how does it actually work — and is it as safe as it seems?

What is USDT

USDT is a stablecoin created in 2014 by Tether Ltd. Its purpose: maintain a value equivalent to 1 US dollar (1 USDT = $1 USD) at all times.

Unlike Bitcoin or Ethereum, whose prices fluctuate constantly, USDT is designed to be stable — making it a key tool for traders and investors who want to operate within the crypto ecosystem without exposure to volatility.

USDT exists on multiple blockchains:

  • Ethereum (ERC-20): the most widely used version in DeFi
  • Tron (TRC-20): very low fees, popular for transfers
  • Solana, Polygon, Avalanche, and other networks

How the reserve system works

Tether claims to hold $1 in reserves for every USDT issued, composed mainly of:

  • Cash and cash equivalents
  • US Treasury bills (T-bills)
  • Other financial assets

However, Tether’s transparency has been questioned. In 2021, it was fined $41 million by the US CFTC for falsely claiming its reserves were 100% cash-backed when they included loans to affiliated companies. It now publishes quarterly reserve reports, though these are not full independent audits.

What USDT is used for

  1. Trading: The most common trading pair on exchanges. Buying Bitcoin or other crypto often involves USDT as an intermediary.
  2. International transfers: Faster and cheaper than a traditional bank transfer, especially on TRC-20.
  3. Volatility hedge: When markets fall, many traders “park” funds in USDT without converting to fiat.

Risks of USDT

  • Counterparty risk: If Tether Ltd became insolvent or its reserves proved insufficient, USDT could lose its dollar peg.
  • Regulatory risk: MiCA in Europe creates uncertainty about USDT’s future in the EU.
  • No central bank guarantee: Unlike a bank deposit, USDT has no deposit insurance.

The collapse of UST/LUNA in 2022 — an algorithmic stablecoin, very different from USDT — was a reminder that no stablecoin is completely risk-free.

USDT vs USDC

  • USDT has higher liquidity and daily volume, available on more exchanges and blockchains.
  • USDC offers greater reserve transparency and better regulatory standing under MiCA.

Read our full USDC vs USDT comparison. Also see what are stablecoins for broader context.

You can buy USDT or USDC directly on Kraken, one of the most regulated exchanges available worldwide.

Frequently Asked Questions

Does USDT always equal exactly $1?
Not always. During market panics it can deviate slightly, though historically it has maintained its dollar peg with very few exceptions.
Is USDT the same as the US dollar?
No. USDT is a private token issued by Tether Ltd, without the backing of any central bank or deposit guarantee scheme.
Which blockchains support USDT?
USDT exists on multiple networks: Ethereum (ERC-20), Tron (TRC-20), Solana, Polygon, and others. TRC-20 typically has the lowest fees for transfers.
Where can I buy USDT?
You can buy USDT on regulated exchanges like Kraken, directly with euros or dollars via bank transfer or card.
Daniel

About Daniel

Frontend engineer passionate about blockchain technology. Founder of Criptomo.

Spain CRIPTOMO

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