Circle, the issuer of the USDC stablecoin, disclosed that $819 million of its USDC-related revenue went to distribution partners and costs in the first half of 2026. The company published the breakdown as part of an effort to detail how reserve income from the second-largest dollar-pegged token is shared across its ecosystem.

The disclosure matters because it quantifies, for the first time at this granularity, the share of USDC revenue that never reaches Circle's own books. Distribution partners — exchanges and platforms that hold USDC balances on behalf of users — receive a portion of the interest earned on the reserves backing the token. The $819 million figure covers those partner payments plus associated costs over the six-month period.

What does the disclosure actually cover?

The number covers only the first half of 2026. It aggregates two categories: payments to distribution partners and Circle's own costs. The company did not, at least in this disclosure, separate the two components. That omission limits what outsiders can infer about the economics of individual partnerships.

Read as an annualized run rate, the figure approaches $1.6 billion per year flowing out of USDC reserve income before Circle records its retained share. For context, that sum exceeds the annual budget of several mid-sized U.S. federal agencies.

The structure reflects how Circle grew USDC after the 2023 depeg episode. The company adopted a model in which exchanges such as Coinbase receive a share of reserve yield on the USDC they custody, an arrangement regulators have scrutinized as potentially blurring the line between payment instruments and interest-bearing products. Circle's disclosure does not address that regulatory question; it only states the amounts.

Why now?

Circle has faced sustained pressure to be more transparent about the unit economics of USDC, particularly since its public listing. Reserve income — interest earned on the Treasuries and cash backing the token — is the core revenue engine, and it moves directly with U.S. interest rates. Every disclosure of this kind therefore doubles as an implicit statement about rate sensitivity.

What the company has not said is equally notable. The announcement does not specify total USDC revenue for the period, which prevents calculation of the exact percentage retained by Circle. It also does not break out individual partner shares. Investors must wait for fuller financial statements to reconcile the split.

The bottom line is simple: nearly $820 million in half-year revenue left Circle's ecosystem as partner payments and costs, and the company still has not shown the denominator.