Will USDC hit 50% of USDT market cap by December 31, 2026?

As of September 2, 2026, Polymarket prices “Will USDC hit 50% of USDT market cap by December 31, 2026?” at 28% YES with $102K traded. No tracked wallet holds a position on this market, so there is no verdict.

Prediction markets put the probability at 28%: Will USDC hit 50% of USDT market cap by December 31, 2026. Currently, markets see this as unlikely (28% YES).

What’s Happening

As of August 4, 2026, the circulating market caps for the two dominant dollar-pegged stablecoins have contracted in tandem, with Tether's USDT falling to $183 billion from nearly $190 billion in April, while Circle's USDC dropped to $72 billion from $79.5 billion in March. This pullback occurs against a total stablecoin market valuation of $319.9 billion recorded on June 1, 2026, according to industry data. The relative gap remains stark: USDT holds a 58.74% share of all stablecoins, whereas USDC commands roughly 23.7%, leaving the question of whether USDC can hit 50% of USDT market cap a distant scenario requiring a near-total inversion of current flows. Historical data shows USDC's best relative performance was in 2022, when it reached 34% of the market versus USDT's 52%, but it has since settled into a 20-25% band through 2025 and early 2026 [CoinDesk, Aug 04].

The structural barriers to USDC hitting 50% of USDT market cap are evident in the growth metrics from 2025. While USDC's market cap gains were significantly greater in percentage terms, Tether added nearly $50 billion in absolute value—more than twice the dollar amount added by its closest rival. By the first quarter of 2026, USDT's market cap stood at $183.6 billion against USDC's $75.3 billion, a ratio that has remained static at roughly 61% vs. 25% market share for over a year. However, a countervailing trend emerged in transaction volume: USDC reached 40% of stablecoin transaction volume by early 2026, driven by its dominance on decentralized finance platforms, particularly Base, which has surpassed Ethereum and Tron in certain DeFi activity metrics. This divergence between market cap and usage suggests that while USDC is the preferred medium for on-chain economic activity, it has not translated into equivalent capital retention [CoinLaw, Jul 22].

Looking ahead to the December 31, 2026 deadline, the probability of USDC reaching half of USDT's market capitalization faces headwinds from institutional demand dynamics. Recent market analysis indicates that institutional demand for stablecoins remains anemic, with both assets experiencing outflows in the second quarter of 2026—a period that also saw the U.S.-listed spot bitcoin ETFs record subdued inflows. For USDC to close the gap, it would need to add approximately $19 billion while USDT remains flat, or alternatively benefit from a regulatory shift that disadvantages Tether. The historical precedent from 2022, when USDC briefly narrowed the gap to a 52/34 split during a period of crypto market stress, demonstrates that rapid convergence is possible but has historically reversed once market conditions normalized. With the total stablecoin market projected to grow, the more likely path involves USDC capturing a disproportionate share of new issuance rather than converting existing USDT holdings [CoinGeek, Sep 10].

Traded on Polymarket — $102K Volume