Stablecoins just had their biggest month ever, and it wasn’t particularly close. Adjusted transaction volume hit $1.79 trillion in June 2026, narrowly eclipsing the previous record of $1.78 trillion set back in February.

The headline number is impressive on its own, but the composition underneath tells a more interesting story. Circle’s USDC accounted for roughly 67% of that volume, or about $1.21 trillion. Tether’s USDT, the longtime king of dollar-pegged tokens, managed around 32% with $576 billion.

In English: for every $3 moving through stablecoin rails in June, $2 went through USDC.

The numbers in context

June’s $1.79 trillion represents a 63% jump from May’s $1.1 trillion and a 125% increase compared to the same month last year.

Zoom out to the full first half of 2026, and the pattern becomes even more stark. USDC commanded roughly 70% of adjusted stablecoin volume across the six-month period, while USDT’s share hovered around 25%.

One important caveat worth noting: these figures come from Visa’s Allium-powered on-chain analytics, which strips out non-economic activity like bot transactions, exchange transfers, and other noise.

As of late June, USDC’s circulating supply stood at approximately $73.7 billion. The total stablecoin market capitalization, meanwhile, exceeded $315 billion. USDC turned over its entire supply roughly 16 times in a single month.

Why USDC is winning the volume war

The US has spent the better part of two years building a clearer framework for stablecoin issuers. Circle, as a US-domiciled company that has leaned hard into compliance since its founding, has been the most obvious beneficiary. When banks, payment processors, and corporate treasuries need to move dollar-denominated value on-chain, they’re increasingly reaching for the token that comes with a regulatory seal of approval.

Tether remains the dominant stablecoin by market capitalization and continues to serve as the primary trading pair on many offshore exchanges. USDC’s lead suggests it’s winning the use case that arguably matters more for long-term adoption: payments and enterprise settlement.

What this means for investors

For investors evaluating the broader digital asset landscape, the $315 billion total stablecoin market cap serves as a useful barometer. Stablecoins are the on-ramps, off-ramps, and settlement layer for the entire ecosystem.

The USDC-specific angle matters for a different reason. Circle has been positioning itself as the institutional-grade stablecoin issuer, and the volume data suggests that bet is paying off. If and when Circle pursues a public listing, these numbers become the core of the investment thesis: not just supply growth, but velocity and genuine economic utility.