USDT (Tether) is the largest stablecoin by circulation and liquidity — approximately $115B in 2026. USDT dominates trading pairs on Asian exchanges and remains the default settlement asset for spot trading globally. While transparency trails USDC, USDT's liquidity depth and network effect are unmatched.
What USDT actually is
USDT is a fiat-collateralized stablecoin issued by Tether Limited (BVI-incorporated). Every USDT is claimed to be backed by an equivalent value of USD equivalents held in reserve. Tether publishes quarterly attestations by BDO.
USDT is available on 15+ chains but heavily concentrated on Tron (>50% of circulation) — Tron transfers are the cheapest USDT settlement layer globally, which is why Asian markets use Tron heavily.
Reserves and transparency
- Backing: mix of US Treasuries (~80%), cash, secured loans, bitcoin (~5%), and other assets
- Attestations: quarterly reports by BDO, published on Tether's transparency page
- Regulation: BVI-incorporated; not directly regulated by US authorities
- Circulation: ~$115B in 2026 (largest stablecoin globally)
Regulatory history
Tether settled with the NYAG in 2021 ($18.5M penalty) and CFTC in 2021 ($41M penalty) over past reserve representations. Post-settlement, Tether has increased transparency and reserve quality significantly, but past disputes contribute to the transparency gap vs USDC.
In 2024-2026, Tether has faced additional regulatory scrutiny in various jurisdictions but continues operating as the dominant global stablecoin.
Who should use USDT
- Users trading on Asian exchanges where USDT is the dominant pair
- Users needing cheap USDT transfers via Tron ($0.10 vs $5-50 on Ethereum)
- Users bridging value in regions with limited banking access
- High-liquidity trading requiring USDT-denominated pairs
Who should consider alternatives
- Long-term holdings: USDC has better transparency
- Regulatory-clarity priority: USDC or PYUSD
- DeFi in Ethereum ecosystem: USDC is more deeply integrated
Verdict
USDT is the largest stablecoin by liquidity and circulation. For trading and cross-border settlement, USDT's network effect is genuinely unmatched. For long-term holding, USDC's transparency is worth the smaller ecosystem.