What happened?
Circle, the issuer of USDC, the second largest stablecoin, released its 2025 figures, and they show two things at once: rapid growth and a steep price for it. According to the 10-K filing cited by CryptoSlate, USDC circulation in the fourth quarter rose 72% year over year to $75.3 billion. Total revenue and reserve income for the full year climbed 64% to $2.7 billion (from $1.68 billion).
But there is a bill hiding behind that growth. Distribution costs tied to Coinbase reached $1.4 billion in 2025, according to CryptoSlate, up from $924.5 million the year before. That works out to roughly 51% of Circle's total revenue and reserve income for the year.
Why are distribution costs so high?
A stablecoin works like this: the issuer holds reserves (typically short-term government bonds and cash) and collects interest on them. Distribution costs are what Circle pays partners to get USDC into users' hands and keep it in circulation. The largest such partner is the exchange Coinbase.
The key figure CryptoSlate highlights: despite the accelerating growth, Circle's margin after distribution and transaction costs stayed at 39%, the same as in 2024. In other words, greater volume has not yet translated into a better ratio of what Circle keeps. Rising revenue was matched by proportionally rising distribution costs.
| Metric (per 10-K, cited by CryptoSlate) | 2024 | 2025 |
|---|---|---|
| Revenue and reserve income | $1.68B | $2.7B |
| Distribution costs (Coinbase) | $924.5M | $1.4B |
| Margin after costs | 39% | 39% |
| USDC circulation (Q4, YoY) | – | $75.3B (+72%) |
What does this mean for the "dominance" picture?
USDC is growing and gaining market share, the numbers confirm that. At the same time, the filing reveals that a significant portion of the stablecoin's economics flows to distribution partners, not the issuer. That is a fact from the document, not a judgment. Whether the cost ratio improves or worsens over time is not clear from the available data.
How does regulation fit in?
The backdrop is regulatory. According to Kraken Blog, July 18 marks the deadline for finalizing rules under the US GENIUS Act, when six federal agencies are to complete rules on capital, reserves, and licensing for issuers of the USDC and USAT stablecoins. In the same overview, Kraken notes that the FOMC meets on July 28 and 29, with the federal funds rate holding in the 3.50% to 3.75% range for the fourth meeting in a row.
The level of rates is relevant to this business: reserve income depends on the yields of short-term instruments, which move with central bank rates. That is a connection the data supports, not a causal link to any specific Circle outcome.
Internationally, coordination is increasing. According to Decrypt and Incrypted, the US and the UK published joint recommendations on aligning rules for stablecoins and tokenization. The parties endorsed the use of stablecoins in cross-border payments and settlement and leaned toward full backing by liquid assets at a 1:1 ratio. Decrypt also notes that this is a shared direction without binding rules.
What to watch in this kind of situation?
- Whether Circle's margin shifts in future filings, or stays at 39%.
- The structure of the deal with distribution partners, because that is what determines how much of the income stays with the issuer.
- The final text of the rules under the GENIUS Act and how they adjust reserve and licensing requirements.
- The trajectory of rates, because reserve income is tied to them.
Charliedesk does not give buy or sell recommendations. This is a description of what the filing and the announcements showed, and what follows from them so far.