Unpacking the Hidden Mechanics of Stablecoin Reserves

Stablecoins, often thought of as simple tokens pegged to one dollar, have complex underlying reserve structures. These reserves are essentially small balance sheets that manage cash in banks, short-term U.S. Treasuries, and overnight Treasury repurchase agreements. To understand stability, redemptions, and counterparty risk, it's essential to grasp what sits in these reserves and how they behave during market turmoil.

The three pillars of stablecoin reserves are bank cash for immediate redemptions, short-dated U.S. Treasuries for principal safety, and overnight Treasury repurchase agreements for same-day liquidity. For example, USDC reports $72.9 billion in circulation and $73.1 billion in total reserves as of July 23, 2026, with the majority held in a BlackRock-run government money market fund.

Government money market funds operate under SEC Rule 2a-7, which constrains risk and keeps portfolios short. Issuers earn interest on reserves, but holders generally do not, unless explicitly stated. At scale, these allocations can influence Treasury yields and repo conditions.