USDT (Tether) is a dollar-pegged stablecoin issued by Tether. Holders treat one USDT as a claim that should trade near one US dollar across major venues and chains. The token is the quote asset for a huge share of crypto spot and derivatives books, so desks read USDT depth, issuance, and depeg risk almost as carefully as they read Bitcoin itself.
Why it matters
USDT is plumbing, not a side trade. When alt pairs quote in USDT, your fill quality, funding, and exit path all depend on that book staying thick and the peg staying close to one dollar. A temporary soft peg can still wreck leveraged books that assume cash-like stability. Issuer risk, banking partners, attestation timing, and freeze powers sit on the risk list even on quiet days.
Multi-chain USDT also creates address and bridge traps. The same ticker on different networks is not interchangeable without a transfer path. Sending the wrong chain version, using a fake mint, or trusting an unofficial bridge can erase funds faster than a mild depeg ever would. Desk habit is to confirm the network, the official contract path, and whether the venue you trade on can withdraw that specific form.
Supply growth and exchange balances are flow signals. Rising exchange USDT can mean dry powder waiting for risk assets. Falling balances can mean traders already deployed or moved to other dollar tokens. None of that is a price target. It is context for whether a breakout has cash behind it or is running on thin books.
Example
An exchange shows the deepest alt book in ALT/USDT while USD pairs look empty. You size the trade in USDT terms, but you also check whether USDT itself trades near one dollar on that venue and whether withdrawals of that chain version are open. If the peg wobbles or the chain withdrawal pauses, the liquid-looking ALT book is less useful than it looked on the chart.