Stablecoin payment volume reached $482 billion in the first nine months of 2026, marking a 45% increase despite total supply growing only 0.4% to $305 billion. Transaction count jumped 71% to 1.04 billion during the period, while average transaction size declined from $544 to $462. September set a new monthly record with $72 billion in volume, contributing to a 51% year-over-year gain in Q3. Market dynamics shifted as major issuers Tether, Circle, and Ethena saw supply contractions this year, while smaller issuers added a combined net $6.9 billion. Emerging use cases accelerated significantly in Q3, with AI agent payment transactions doubling to 68.3 million and stablecoin card spending expanding tenfold to $3.9 billion.