The Stablecoin Market Is Splitting in Two. Circle Is Winning the Half That Matters.

For years, “stablecoin market share” meant one number: how many dollars a company had in coins outstanding. By that number, Tether’s USDT is still the giant, with roughly $184 billion in circulation against Circle’s USDC at around $73 billion. Judged that way, the gap looks close to unbridgeable.

That number is also the wrong one to watch.

Two Different Stablecoin Markets

Coins outstanding measures how much money is parked. It says nothing about how much money is actually moving, or who is trusted to move it for a bank, a payments company, or a corporate treasury. Those are two different markets wearing the same ticker symbols, and they are moving in opposite directions.

On adjusted transaction volume, the figure Visa’s onchain analytics dashboard uses to strip out bot activity and exchange-to-exchange noise, USDC carried roughly 70 percent of all stablecoin activity in the first half of 2026. USDT carried about 25 percent. Six years ago, the picture was the mirror image: USDT handled nearly 90 percent of adjusted volume and USDC less than 10.

Source: CoinDesk

That is not a rounding shift. It is a full inversion of who the market trusts to actually settle a payment, even while the older, cruder measure of coins outstanding still favors Tether.

The Metric Banks and Regulators Actually Care About

Coins outstanding is a snapshot. Transaction volume is a vote, cast every day, by the institutions with the most to lose from picking wrong. When Standard Chartered and BNY built stablecoin settlement services this year, they built them on USDC. That is not an accident of branding. It is a compliance decision.

Circle spent a decade making itself boring on purpose: US-domiciled, dollar reserves in cash and short-term Treasurys, monthly attestations, licenses in the US, EU, and Singapore. Tether built its business the opposite way, operating out of El Salvador and the British Virgin Islands with looser disclosure, and it remains unregistered in both the US and the EU. For a hobbyist or individual moving crypto between exchanges, that difference barely registers. For a bank wiring nine figures, it is the entire decision.

Tether only just completed its first clean audit, with KPMG issuing an unqualified opinion in August 2026. That’s a step in the right direction, but it might be a little late, given Circle’s momentum.

Regulation Just Became the Moat

That decision got a lot easier to make this summer. The GENIUS Act, signed into law in July 2025, gave the United States its first federal framework for payment stablecoins. In July, the Office of the Comptroller of the Currency approved Circle’s application to open Circle National Trust, a national trust bank that puts USDC’s custody infrastructure under direct federal oversight, with reserve management planned as a future capability.

Europe tells the same story, but from the other direction. When MiCA, the EU’s crypto framework, came into force, Tether declined to comply, calling the rules too restrictive. European exchanges responded by delisting USDT for EU customers and Tether retired its own euro-denominated token. Circle, already MiCA-compliant, inherited that regulated marketby default. The pattern is now consistent enough to call a rule: every time a major jurisdiction writes real stablecoin regulation, USDC becomes easier to use and USDT becomes more toxic to touch.

What Happens When the Rulebook Is Final

None of this means Tether is disappearing. USDT remains the dominant trading pair on offshore exchanges, and coins outstanding do not reverse overnight; Circle would need to more than double its current supply just to match where Tether sits today. But that static number describes yesterday’s market, not the one being built right now under a US regulatory framework that did not exist eighteen months ago.

Here is my prediction. By mid 2027, USDC will carry the outright majority of stablecoin activity by every measure that actually reflects economic use, not just the adjusted-volume figure where it has already crossed that line. As GENIUS Act rules go final and more banks plug into regulated rails rather than build their own, the stablecoins that win will be the ones that a compliance officer can approve without a fight. Right now, that is USDC, and it is not close.

The deeper shift is bigger than one company’s balance sheet. For most of the last decade, “stablecoin” and “unregulated” were treated as roughly synonymous, a workaround for the parts of finance that regulators had not yet reached. That era is ending. The next one belongs to whoever can move a dollar instantly, transparently, and under a rulebook a bank examiner recognizes.

Circle got there first. The rest of the market, regulated and unregulated alike, is now building in its shadow.