The market capitalization of Tether (USDT) surpassed $172 billion in late September 2025, exceeding that of USDC by a significant margin, according to data cited by The Motley Fool.
Despite both stablecoins being pegged 1-to-1 to the U.S. Dollar, fundamental differences in their structure and oversight continue to shape their roles in the cryptocurrency ecosystem. Tether, launched in 2014, maintains the largest market share and highest trading volumes, favored by high-frequency traders for its liquidity across numerous exchanges. USDC, created in 2018, trails in market cap at approximately $74 billion, but is increasingly viewed as the more transparent and regulatory-compliant option.
The disparity in perception stems from differing approaches to reserves and auditing. Tether Holdings Limited, the private company managing USDT reserves, reported holdings of $149.3 billion against $143.7 billion in circulating coins as of March 31, 2025, according to its latest report. These reserves are allocated primarily to U.S. Treasury bills, repurchase agreements and money market funds, but likewise include allocations to Bitcoin, precious metals, and corporate bonds. USDC, issued by Circle, has its reserves managed by BlackRock, a publicly traded asset management firm.
Regulatory scrutiny has consistently shadowed Tether. Questions regarding the full backing of USDT and the composition of its reserves have persisted, prompting calls for greater transparency. USDC, benefiting from its association with Circle and BlackRock, is generally perceived as having a more robust and regularly audited reserve structure. Circle publishes a monthly attestation report, although Tether provides quarterly reports.
The differing profiles of the two stablecoins cater to distinct user bases. According to a report from Nasdaq, Tether’s established presence and liquidity make it the preferred choice for active crypto traders navigating multiple exchanges. Conversely, USDC’s emphasis on transparency and regulatory compliance appeals to long-term investors and institutions seeking a more secure and auditable stablecoin option. As of February 12, 2026, USDC maintains a market cap of $73 billion, with a current price of $1.00 and a 24-hour trading change of 0.00%.
Both Tether and USDC are backed 1:1 by reserves, designed to maintain a constant US$1 value, but have experienced depegging events in their histories, as noted by Crypto.com. The NYSE listing of USDC further solidifies its position as the most institutionally aligned stablecoin on the market.
As of September 24, 2025, Tether’s daily trading volume significantly outpaced that of USDC, reinforcing its dominance in the high-frequency trading space. However, the long-term implications of regulatory developments and evolving investor preferences remain uncertain.