Circle, the company that issues USDC, makes the vast majority of its money by earning interest on the reserves that back every token in circulation. When you buy one USDC, you hand over one U.S. dollar. Circle doesn’t just sit on that cash. It invests those pooled reserves in short-term, low-risk assets and keeps the yield. You get a digital dollar that holds its value. Circle gets billions in annual interest income.
How the Reserve Generates Income
Every USDC in circulation is backed 1:1 by reserve assets. The majority of those reserves sit in the Circle Reserve Fund, an SEC-registered government money market fund managed by BlackRock. That fund holds cash, short-dated U.S. Treasury bills, and overnight Treasury repurchase agreements (essentially very short-term loans backed by government bonds). The remainder of the reserve is held as cash deposits at large global banks.
As of mid-2025, the reserve breakdown looks roughly like this: about 51% in repurchase agreements, 34% in U.S. Treasuries, 14% in bank deposits, and a small slice in other assets. Every one of those holdings generates yield. Treasury bills pay interest. Repo agreements pay interest. Even the bank deposits earn something. When USDC has tens of billions of dollars in circulation, even modest yields add up to substantial revenue. At a 4% to 5% annualized return on reserves, a $30 billion float generates well over a billion dollars a year in gross interest income before expenses.
The key insight is that Circle keeps this yield rather than passing it to USDC holders. Unlike a savings account where the bank shares interest with depositors, holding USDC earns you nothing. The token stays worth $1, but you don’t receive any of the income those dollars produce while Circle holds them. That gap between what the reserves earn and what holders receive (zero) is the core business model.
Revenue Sharing With Coinbase
Circle doesn’t keep all the reserve income for itself. Under a collaboration agreement with Coinbase dating to August 2023, the two companies split the economics of USDC. This deal replaced the old Centre Consortium structure that originally governed the stablecoin.
The agreement defines a “Payment Base,” which is the total interest, dividends, and realized gains on the reserves, minus third-party portfolio management and custody fees. From that base, Circle retains a set percentage (the exact rates are redacted in public filings and scale with USDC circulation levels). Coinbase then receives a share tied to how much USDC is held within Coinbase products, including its custodial wallets and exchange accounts. In practical terms, Coinbase has a direct financial incentive to get its users to hold and use USDC, and it earns a meaningful cut of reserve income for doing so.
This is why Coinbase prominently features USDC across its platform and sometimes offers yield on USDC balances to attract deposits. The yield Coinbase pays users comes out of its share of the reserve income, not from Circle directly.
Minting and Redemption Fees
Surprisingly, Circle does not charge fees for the basic act of creating or redeeming USDC through its institutional platform, Circle Mint. Wire transfers for converting U.S. dollars into USDC (called tokenization) are free, and wiring dollars back out when you redeem USDC is also free, as long as you’re using standard U.S. dollar wires. USDC-to-dollar redemptions carry no fee unless unspecified volume thresholds are exceeded.
This fee-free approach is deliberate. Circle wants as much USDC in circulation as possible because every dollar minted is a dollar earning interest in the reserve. Charging transaction fees would discourage large institutions from moving money through USDC, which would shrink the float and reduce the far more lucrative interest income. Free minting is, effectively, a growth strategy for the reserve.
Why Circulation Size Matters So Much
Circle’s revenue scales almost entirely with two variables: how much USDC is in circulation and what short-term interest rates are. The company has very little pricing power over the second variable (that’s set by the Federal Reserve), so its entire growth strategy focuses on the first. More USDC in wallets, exchanges, DeFi protocols, and cross-border payment channels means a bigger reserve earning interest.
This explains Circle’s heavy investment in partnerships, regulatory compliance, and global expansion. Getting USDC listed on more exchanges, integrated into more payment rails, and approved under more regulatory frameworks all serve one purpose: growing the float. It also explains why the Coinbase revenue-sharing deal exists. Paying Coinbase a cut of reserve income is worth it if Coinbase’s distribution drives billions more USDC into circulation.
What Happens When Interest Rates Fall
The model has an obvious vulnerability. If the Federal Reserve cuts rates significantly, the yield on Treasury bills, repo agreements, and bank deposits all drop, and Circle’s revenue shrinks even if USDC circulation stays flat. During the near-zero rate environment of 2020 and 2021, stablecoin issuers earned almost nothing on reserves. The surge in stablecoin profitability from 2022 onward tracks directly with the Fed’s rate hikes.
To offset this risk, Circle has been building additional revenue streams, including payment and platform infrastructure services. But reserve interest remains the dominant source of income by a wide margin. The business model is, at its core, a massive money market fund where the depositors don’t get paid.