Put a stablecoin issuer’s financials in front of a money-market fund manager without the name on top, and the answer is immediate: this is a spread business.

The logic is brutally simple: take in a large pile of money that pays no interest, buy Treasuries, keep the spread. That “money that sits with you temporarily, can be redeemed on demand, and costs you no interest” has a name: float. Insurance companies live on it. Buffett turned it into an art. Stablecoin issuers are just the digital version of the same old business. A caveat a fund manager would demand: this is the economic model, not a legal classification — a stablecoin is not a registered money-market fund.

Circle’s Q1 2026 numbers tell the story:

• USDC circulation: $77B
• Reserve income: $652.5M
• Total revenue: $694.1M

Seventy-seven billion dollars of no-interest liabilities, and one quarter of reserve income alone brought in more than $650M. On paper, that looks like a money printer.

Then the twist. The biggest cost in this business is not technology. It is the channel tax:

• Distribution & transaction costs: $405.4M
• Of that, Coinbase alone: $330.6M
• GAAP net income: just $55.2M

Do the math: the money Circle paid Coinbase was 6x its own net profit.

Why? Because Coinbase owns the users and the balance entry point. Circle handles issuance, reserves, compliance, and banking relationships. Coinbase sits on the doorway and collects the interest. Circle is not USDC’s owner. It is its contract manufacturer.

Tether is the counterexample. It cleared $1.04B in a single quarter, and its public disclosures do not show a comparable channel-sharing burden. The difference is not the mechanism. It is the ownership of distribution.

Circle’s channel tax is visible in the financials. Tether’s distribution advantage is visible in the network effect.

That is the real battleground in stablecoins: not who is better at buying Treasuries, but who can avoid paying for distribution.

There is one more bomb people keep underestimating: this is a rate bet. Reserve income sits almost entirely on short-term rates. Circle itself disclosed that yields fell by 66 bps year over year. Higher circulation helped, but every dollar earned less. If rates go back toward zero, a “high-margin cash machine” quickly turns into a “high-fixed-cost operating system.”

Three things to remember:

1. Stablecoins are not a tech business. They are a rate business.
2. They are not a money-printing business. They are a distribution business.
3. Most teams should not issue their own coin. First ask: do you actually control the user entry point?

— Excerpt from The Stablecoin Operator’s Handbook: Distribution, Reserves & Compliance.
Ongoing — tear it apart.

#StablecoinEconomics #ChannelTax #USDC #USDT