Circle's USDC has overtaken Tether's USDT as the dominant stablecoin by transaction volume, handling roughly 67% of the $1.79 trillion in adjusted stablecoin activity recorded in June 2026. This marks a historic reversal from 2020, when USDT controlled nearly 90% of adjusted volume. The shift reflects a fundamental split in how stablecoins are now used: USDC dominates institutional settlement and payments, while USDT remains larger by total supply but serves a different market segment.

How Did USDC Overtake Tether in Just Six Years?

The reversal did not happen overnight. In 2020, USDC represented less than 10% of adjusted stablecoin volume. By 2022, Circle's token had expanded to roughly 45% of the market. The first clean monthly flip, where USDC's adjusted volume exceeded Tether's for the first time since 2019, occurred in early 2025. June 2026 widened the gap further, with USDC commanding roughly 70% of adjusted stablecoin volume across the first half of the year, while USDT accounted for around 25%.

The growth accelerated as regulatory clarity improved in the United States and Europe. Financial firms increasingly view stablecoins as efficient tools for real-time payments, liquidity transfers, and international settlements without depending on slower traditional banking infrastructure. Circle, as a US-domiciled company that has leaned hard into compliance since its founding, became the obvious beneficiary of this shift.

Why Are Banks Choosing USDC Over Building Their Own Coins?

The turning point came when major financial institutions decided to adopt USDC rather than develop proprietary digital dollar systems. Standard Chartered became the first global systemically important bank to offer USDC minting and redemption through ordinary banking infrastructure. BNY Mellon, the largest custodian on earth with approximately $59 trillion under administration, made USDC the first stablecoin on its digital asset custody platform. Neither institution built a proprietary coin; both plugged into Circle's network instead.

This institutional adoption reflects a strategic calculation: regulated settlement infrastructure is more valuable than trading volume. Circle's reserves sit in Treasury bills and cash at named institutions with monthly attestations. The company pursued American regulatory posture through the GENIUS Act era and achieved Markets in Crypto-Assets Regulation (MiCA) compliance in Europe, while Tether refused the framework's reserve rules and was forced out of the regulated European market.

• Regulatory Compliance: USDC maintains transparent reserves in T-bills and cash at named institutions with monthly third-party attestations, making it approvable by corporate compliance departments.
• Institutional Infrastructure: Major custodians and global banks now offer USDC settlement services through their existing banking infrastructure, reducing operational friction for large transactions.
• Cross-Border Efficiency: Banks and financial firms use USDC for faster international settlements and treasury management without depending on traditional banking rails.
• Regulatory Clarity: Circle's compliance-first approach aligned with emerging stablecoin frameworks in the US and Europe, while competitors faced restrictions in regulated markets.

What Do the Volume Numbers Actually Reveal?

The adjusted transaction volume figures strip out non-economic activity like bot transactions, exchange transfers, and other noise that can artificially inflate throughput. Visa's Allium-powered on-chain analytics dashboard filters these elements to approximate volume that represents someone actually paying, settling, or moving money.

June's $1.79 trillion in adjusted stablecoin volume represented a 63% jump from May's $1.1 trillion and a 125% increase compared to June 2025. Across the first half of 2026, total adjusted transaction volume reached $8.82 trillion, already surpassing the entire $5.8 trillion recorded in 2024 and moving closer to the record $10.8 trillion posted in 2025.

One critical distinction deserves attention: USDT processed 145 million transactions in June against USDC's 57 million. Tether moves far more transactions; Circle moves far more money. The average economic USDT transfer is small, while the average USDC transfer is enormous. This single contrast contains the entire structure of the modern stablecoin market: one token is used by tens of millions of people for smaller transactions, the other is used by institutions moving significant size.

What Happens to Tether Now?

Tether remains the dominant stablecoin by market capitalization, with USDT near $184 billion compared to USDC's approximately $73.7 billion as of late June. The supply crown and the volume crown now sit on different heads, and this split is not a paradox; it is the clearest picture of what stablecoins have actually become.

Tether continues to serve as the primary trading pair on many offshore exchanges and remains stronger in transaction count, emerging-market usage, and offshore dollar demand. The company's position reflects a bifurcation of the stablecoin world into two markets that barely compete anymore: a settlement layer led by USDC and a savings or trading layer led by USDT.

USDC's turnover rate illustrates the velocity difference. The token turned over its entire supply roughly 16 times in a single month, demonstrating how actively institutions are cycling capital through the network for payments and settlements rather than holding it as a store of value.

The next major competitive front will focus on yield, distribution, and whether new consortium or native stablecoins can challenge USDC's settlement moat. However, the institutional infrastructure advantage Circle has built appears durable; banks and custodians have already integrated USDC into their operational workflows, creating switching costs for any competitor.