Circle's USDC Dominates Stablecoin Market With 79% Share of Transaction Volume

In the third quarter of 2026, Circle's USDC stablecoin accounted for 79% of transaction volume in the stablecoin market, as total on-chain activity reached $13.9 trillion. USDC is Circle's stablecoin, and the 79% share shows it represented the large majority of stablecoin transaction volume during that period. The $13.9 trillion figure describes the total on-chain activity recorded in the market for the quarter, during which USDC held that share.