DefiLlama data as of October 17, 2026, put Tether’s USDT at $183.4 billion and Circle’s USDC at $72.7 billion. Together they accounted for roughly $256 billion, or more than 85% of the $302 billion stablecoin market. The next largest coin listed, Sky Dollar, stood at $6.8 billion; Ethena’s USDe was at $4.7 billion.
Tether CEO Paolo Ardoino predicted that as many as one trillion AI agents would transact in USDT within 15 years. That is a forecast, not a measured result.
