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

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 mid-September 2025, the stablecoin market is characterized by a widening absolute gap between Tether (USDT) and Circle’s USDC, yet a narrowing relative growth trajectory. Tether’s market capitalization grew by nearly $50 billion in the past year, more than double the dollar amount added by USDC. However, USDC’s 2025 gains were significantly larger in percentage terms, a dynamic that underpins the current 28% YES probability that USDC will hit 50% of USDT’s market cap by December 31, 2026. This would require USDC to roughly double its share from current levels, a feat that would necessitate either a sustained acceleration in Circle’s issuance or a contraction in Tether’s dominance, which has historically been resilient across multiple crypto cycles [CoinGeek, Sep 10].

The structural divergence between the two assets is most visible in their use cases. USDC’s enduring popularity on decentralized finance (DeFi) platforms was on full display as its integration helped Base surpass Ethereum and Tron in certain transaction metrics, according to recent blockchain data. Meanwhile, USDT retains a dominant grip on centralized exchange liquidity and cross-border settlement corridors, particularly in emerging markets. The market’s 72% NO probability reflects the substantial inertia in stablecoin preferences, where network effects, regulatory posture, and merchant acceptance create high switching costs. Historical precedent suggests that when a leading stablecoin has held a >60% market share, challengers have rarely closed the gap by more than 10 percentage points within a two-year window [Changelly, Aug 20].

Looking ahead, the key indicators to monitor are regulatory developments in the European Union’s MiCA framework and potential US stablecoin legislation, both of which could disproportionately benefit Circle’s compliance-first approach. Additionally, the trajectory of USDC hitting 50% of USDT market cap will hinge on whether institutional treasury adoption—currently favoring USDC for its audit transparency—accelerates beyond the current ~$35 billion gap. A notable data point: USDC’s supply has historically spiked during DeFi yield cycles, while USDT supply has proven stickier during bear markets. If the current crypto bull run extends into 2026, the percentage-growth advantage USDC demonstrated in 2025 could compound, but the absolute scale required remains formidable given Tether’s entrenched liquidity moats across Asian and Latin American exchanges [99Bitcoins, Aug 14].

Traded on Polymarket — $102K Volume

Polymarket prices this at 28c YES with $102K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.