The largest US-dollar-pegged stablecoin by circulating supply, used for trading, settlement, and dollar access in markets without USD banking.
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Tether (USDT) is a stablecoin issued by Tether Limited that aims to maintain a 1:1 peg with the US dollar. It is the largest stablecoin in circulation, with significant share of total stablecoin supply. USDT is issued natively on multiple blockchains including Ethereum, Tron, Solana, and others, with each issuance backed by reserves held by Tether Limited. The reserves consist of cash, US Treasuries, money-market funds, and other assets disclosed in regular attestations.
USDT's primary role is as a unit of account and trading pair on cryptocurrency exchanges. Most crypto trading volume is denominated in USDT rather than fiat USD because it can move on-chain in seconds rather than waiting for bank settlement. In markets where USD banking is restricted or unavailable (parts of Asia, South America, Africa), USDT functions as a practical replacement for USD bank accounts.
Tether maintains the peg through issuance and redemption: authorized counterparties can mint new USDT by depositing USD, and redeem USDT for USD by burning tokens. In secondary markets (exchanges and DeFi), the price floats but tends to stay within a few basis points of $1.00 because arbitrageurs profit from any divergence. Tether publishes quarterly reserve attestations conducted by accounting firms; reserve composition is published in summary form.
USDT exists as separate token contracts on each chain it's issued on, with Tether Limited responsible for ensuring the total minted supply matches the total reserves backing all chains combined. Cross-chain bridges allow holders to move USDT between chains, though the canonical issuance always traces back to Tether Limited's mint authority.
USDT dominates as the primary trading pair on most centralized crypto exchanges. It is used as a settlement currency between exchanges and OTC desks, as collateral in DeFi lending markets (especially on Ethereum and Tron), as a remittance rail in regions with weak banking infrastructure, and as the dollar-equivalent leg of perpetual futures positions. For users in countries with capital controls or unstable currencies, holding USDT is often the most accessible way to maintain dollar-denominated savings.
Tether has faced ongoing scrutiny over the composition and verification of its reserves, regulatory questions about the issuer, and concentration risk in the broader crypto market. The 2022 collapse of TerraUSD (an algorithmic stablecoin) reminded markets that not all "stable" coins are actually stable; while USDT is collateral-backed and structurally different, the event prompted regulators in multiple jurisdictions to require stricter disclosures from stablecoin issuers. Holders should understand they trust Tether Limited as the issuer and are exposed to reserve quality, regulatory action, and counterparty risk.
See the stablecoin glossary entry for the broader category. The premium stablecoin-flows endpoint tracks issuance and redemption flows across the major stablecoins including USDT.