Stablecoin Reserves Explained: Cash, Treasuries and Repo

Stablecoins sound simple on the surface. One token equals one dollar. Underneath, the reserve is a small balance sheet with moving parts: cash in banks, short-term Treasuries, and a lot of overnight repo. If you care about stability, redemptions, and counterparty risk, you need to know what sits in that mix and how it behaves when markets hiccup.

This guide walks through the three pillars of reserves, how they interact, who manages them, and where things can wobble. I will also point to current disclosures that matter right now, because the makeup of reserves is not theoretical anymore. It is a big footprint in money markets.

By the end, you should be able to read a stablecoin transparency page and actually understand what it implies for liquidity, yield, and risk in normal days and stressful ones.

Stablecoin reserves typically sit in three buckets: bank cash for immediate redemptions, short-dated U.S. Treasuries for principal safety, and overnight Treasury repurchase agreements for same-day liquidity. USDC, for example, reports $72.9 billion in circulation and $73.1 billion in total reserves as of July 23, 2026, with most assets held in a BlackRock-run government money market fund that can hold cash, T-bills, and overnight Treasury repo (Circle — Transparency & stability (USDC)).

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