USDT Explained: Networks, Uses & Risks

What is USDT? In short, it is a digital token issued by the company Tether that is designed to keep a steady value of one US dollar. It is the most widely used stablecoin on crypto exchanges, where it often plays the role that cash plays in a brokerage account. This guide explains how that peg is supposed to work, which blockchains USDT travels on, what people use it for and where the risks lie.

What is USDT, in one paragraph

USDT, often called Tether, is a stablecoin: a crypto token whose price is meant to stay fixed against a traditional currency. Tether issues new USDT when approved customers send it dollars and destroys, or "burns", USDT when those customers redeem tokens for dollars. In between, the dollars are invested in reserve assets that Tether says are mainly short-term US government debt and similar holdings, and the company publishes periodic reports on those reserves. If everything works, one USDT can always be swapped for close to one dollar.

How the dollar peg holds

Most people never deal with Tether directly. They buy and sell USDT on exchanges, and the price there is set by supply and demand. What keeps it near $1.00 is arbitrage. If USDT trades at $0.99, a firm that can redeem with Tether has a reason to buy cheap tokens and redeem them for a full dollar, which pushes the market price back up. If it trades above $1.00, the same firms can create new tokens and sell them.

That mechanism depends on two things: that the reserves are really there and easily sold, and that redemption keeps working. When confidence in either wobbles, stablecoins can trade below their peg, sometimes for hours or days. It has happened to USDT and to other stablecoins in past periods of stress.

Networks: the part beginners get wrong

USDT is not tied to a single blockchain. Tether issues it on several, and a token on one network cannot simply be received on another. The two you will see most often are:

When you withdraw USDT from one platform to another, you must choose the same network on both sides. If you send ERC20 USDT to an address that is only set up for TRC20, the funds may be lost or require a slow, uncertain recovery by the receiving platform. The safest routine is to copy the deposit address and network from the receiving side, check both carefully, and send a small test amount first.

Network fees also differ. Fees on Ethereum rise and fall with demand for block space and are paid in ETH, so a wallet holding only USDT cannot pay them. Tron transfers usually need TRX or network "energy". Always check the fee shown before you confirm.

What people use USDT for

• A parking place on exchanges. Traders move into USDT to step out of volatile coins without withdrawing to a bank. Many crypto prices are quoted against it, as in BTC/USDT.
• Moving money between platforms. A stablecoin transfer can arrive in minutes at any hour, while bank transfers follow banking days.
• Holding dollars outside the banking system. In some countries people use dollar stablecoins as an alternative to a weak local currency. That brings its own legal, tax and security questions.

For a long-term share investor, USDT has a limited role. It earns nothing on its own, it is not covered by bank deposit protection, and a dollar-denominated money market fund or bank account usually does the "hold dollars" job with stronger protections.

The risks, plainly

• Issuer and reserve risk. USDT is only as sound as Tether's reserves and its ability to meet redemptions. Its reserve reports are attestations rather than the kind of full audit a listed company receives.
• Freezing. The issuer can freeze USDT held at particular addresses, and has done so in cases linked to theft or sanctions. That can protect victims, but it also means USDT is not beyond anyone's control.
• Platform risk. USDT held on an exchange is a claim on that exchange. If the platform fails or halts withdrawals, the peg does not help you.
• Regulatory change. Stablecoin rules are being written in many countries, and availability on some platforms can change as a result.
• Irreversible mistakes. Wrong network, wrong address or a scam payment usually cannot be reversed.

Address poisoning and other traps

One trick targets people who copy addresses from their transaction history. A scammer sends a tiny amount from an address that looks almost identical to one you use, with the same first and last few characters. Later, you copy the wrong one from your history and send funds to the scammer. Check the full address, not just the ends, and save trusted addresses in an address book.

A worked example of fees

Using illustrative numbers: you convert $1,000 into USDT on a platform that charges 0.1%, receiving 999 USDT. You then withdraw it to another platform, paying a network fee shown as 1 USDT, so 998 USDT arrives. If you convert it back to dollars at another 0.1%, you end up with about $997. None of these steps is large, but repeated transfers add up, which is why our fees guide treats "small" charges seriously.

For the wider picture of how tokens and blockchains work, read our crypto guide.

Sources

• Tether, published reserve reports and transparency information
• Tron and Ethereum network documentation on token standards