$USDC Circle’s USD Coin (USDC) is a leading regulated stablecoin, fully backed 1‑for‑1 by U.S. dollars and cash equivalents, with weekly reserve attestations by a Big Four firm . With $61 billion in circulation and supported across 21+ blockchains, USDC powers fast, cost-effective global payments . The big news: Coinbase Derivatives and clearinghouse Nodal Clear are planning to accept USDC as collateral in U.S. futures trading—pending CFTC approval—marking its first regulated derivatives use case, expected in 2026 . Meanwhile, Circle’s NYSE-listed stock (CRCL) jumped ~16–30% following U.S. Senate passage of the GENIUS Act, which lays the groundwork for federal stablecoin regulation . USDC continues solidifying its role as a reliable digital dollar in finance.