USDT, commonly called Tether, is a cryptocurrency designed to always be worth exactly one US dollar. Unlike Bitcoin or Ethereum, which can swing 10% or more in a single day, USDT maintains a stable price by holding real-world assets (primarily US Treasury bills and cash) in reserve to back every token in circulation. It is the most widely used stablecoin in the world, with over $127 billion in US Treasury exposure alone as of mid-2025.
How the Dollar Peg Works
USDT is what’s known as a fiat-collateralized stablecoin. For every USDT token that exists, the issuing company, Tether Limited, holds a corresponding dollar’s worth of assets in reserve. Verified holders can redeem USDT for US dollars at a 1:1 rate directly through Tether, which creates a floor for the token’s value.
In practice, most people don’t redeem directly with Tether. The peg stays intact on exchanges thanks to arbitrageurs, traders who profit from tiny price differences. If USDT dips to $0.998 on an exchange, arbitrageurs buy it cheaply and redeem it with Tether for a full dollar, pocketing the difference. If it rises above $1.00, they do the reverse. This constant buying and selling pressure keeps the price hovering right at $1.00.
What Backs the Reserves
Tether publishes quarterly attestation reports through the accounting firm BDO. As of the Q2 2025 report, roughly 80% of Tether’s backing assets consist of cash or cash equivalents, primarily US Treasury bills and reverse repurchase agreements. The company reported over $105.5 billion in direct Treasury holdings and another $21.3 billion held indirectly, totaling more than $127 billion in US government debt. That figure makes Tether one of the largest holders of US Treasuries in the world.
The remaining portion of reserves includes secured loans, Bitcoin, gold, and other investments. Tether also makes proprietary investments in sectors like artificial intelligence and renewable energy, but the company states those investments are separate from the reserves backing USDT tokens.
One important distinction: these are attestations, not full audits. An attestation means an accounting firm verifies the numbers at a specific point in time. A full audit involves deeper examination of internal controls and financial practices over a longer period. Tether has not completed a full audit of its reserves.
Where You Can Use USDT
USDT is issued natively on more than a dozen blockchain networks, which means you can hold and transfer it across different platforms. The most commonly used networks include Ethereum (as an ERC-20 token), Tron (TRC-20), Solana, BNB Smart Chain, Avalanche, and TON. It’s also available on Aptos, Near, Polkadot, Tezos, Celo, and several others.
The network you choose affects transaction speed and fees. Sending USDT on Ethereum, for example, can cost several dollars in network fees during busy periods, while Tron and Solana typically offer much cheaper transfers. Most exchanges and wallets support USDT on multiple networks, but you need to make sure the sender and receiver are using the same one. Sending USDT on the Ethereum network to a Tron address, for instance, will result in lost funds.
Why People Use It
USDT serves several practical roles in the crypto ecosystem. The most common is as a safe harbor during market volatility. If you hold Bitcoin and expect a price drop, you can quickly convert to USDT to lock in your dollar value without moving money back to a traditional bank account, which can take days and involve fees.
Traders also use USDT as a base currency for buying and selling other cryptocurrencies. Most major crypto exchanges offer trading pairs denominated in USDT, making it the default unit of account across much of the market. It functions like cash in a brokerage account: you park funds there between trades.
Beyond trading, USDT is widely used as collateral in decentralized finance (DeFi) protocols, where users can lend, borrow, or earn yield on their holdings. It also sees significant use in cross-border payments, particularly in regions where access to US dollars through traditional banking is limited or expensive. Sending USDT across borders settles in minutes and costs a fraction of what a wire transfer would.
Regulatory History and Controversies
Tether’s history includes notable regulatory actions. In October 2021, the Commodity Futures Trading Commission (CFTC) ordered Tether to pay $41 million in civil penalties. The CFTC found that between June 2016 and February 2019, Tether misrepresented its reserves to customers, claiming every USDT was backed by an equivalent amount of fiat currency safely deposited in bank accounts.
The reality was less reassuring. The CFTC found that during a 26-month sample period from 2016 through 2018, Tether held sufficient fiat reserves to fully back all outstanding USDT on only 27.6% of the days examined. The company had included unsecured receivables and non-fiat assets in what it called “reserves” without disclosing that to users. Tether also claimed it would undergo routine professional audits, which never materialized.
Since those settlements, Tether has significantly improved its transparency practices, publishing quarterly attestation reports and shifting the bulk of its reserves into highly liquid US Treasuries. The company reported approximately $4.9 billion in net profit for Q2 2025 alone, largely from interest earned on those Treasury holdings. Still, the lack of a full independent audit remains a point of criticism from regulators and market observers.
Risks to Understand
Despite its dollar peg, USDT carries risks that a dollar in your bank account does not. Your bank deposits are typically insured by the FDIC up to $250,000. USDT has no such insurance. If Tether’s reserves were ever found to be insufficient, or if the company faced a sudden wave of redemptions it couldn’t meet, the peg could break and your USDT could be worth less than a dollar.
Regulatory risk is another factor. Governments around the world are still developing frameworks for stablecoins. New regulations could restrict how USDT operates, where it can be traded, or what reserves Tether must hold. Some exchanges in certain jurisdictions have already delisted or restricted USDT in response to local regulations.
There’s also counterparty risk. When you hold USDT, you’re trusting that Tether Limited is managing its reserves honestly and competently. The 2021 CFTC settlement demonstrated that this trust was misplaced in earlier years. The company’s current attestation reports paint a much stronger picture, but the absence of a comprehensive audit means you’re relying on periodic snapshots rather than continuous verification.