Coinbase CEO warns against banks lending deposits without consent

Coinbase CEO Brian Armstrong wants you to think about something most people never consider: what happens to your money after you deposit it at a bank. Spoiler, the bank lends most of it out. And according to Armstrong, nobody really asked your permission.

In a September 19 interview on the Money Rehab podcast, Armstrong laid out what he sees as a fundamental difference between traditional banking and stablecoin operations. Banks take your deposits and lend them to other people, keeping only a fraction on hand. Stablecoins like USDC, by contrast, are supposed to be backed dollar-for-dollar by actual reserves.

The fractional-reserve problem

Armstrong’s core argument is straightforward. Banks engage in fractional-reserve lending, which means they use customer deposits to issue loans, mortgages, and other credit products. That’s literally the business model, and it’s the reason banks need a license to operate.

“We’re not engaging in fractional reserve lending. That’s what you need a bank license for.”

When you hold USDC, the underlying reserves are parked in things like short-term US Treasuries rather than loaned out to borrowers who might not pay it back.

The GENIUS Act, signed into law in July 2025, requires stablecoin issuers to maintain at least 1:1 reserves backing every token in circulation. The law also prohibits issuers from directly paying interest or yield to token holders.

The rewards workaround

Coinbase currently offers USDC rewards ranging from 3.75% to 4.5%. Those returns are funded through a revenue-sharing arrangement with Circle, the issuer of USDC, which earns interest on the short-term US Treasuries backing the stablecoin’s reserves. Coinbase then passes a portion of that income to users as loyalty-based rewards.

Armstrong’s position is that these rewards are categorically different from interest paid by a bank. Banks pay interest using profits generated partly from lending out your deposits. Coinbase’s rewards come from the yield on fully reserved assets.

Banking lobby groups have raised concerns that stablecoin rewards could trigger massive deposit outflows from the traditional banking system, with some estimates suggesting trillions of dollars could shift. The average savings account at a major US bank pays well under 1%.

Legislation and lobbying

The GENIUS Act established the basic framework for stablecoin regulation, but it left open questions about how rewards programs should be treated. Banking lobbyists are now pushing for the CLARITY Act, which would impose stricter regulations on stablecoin rewards by classifying them as activities equivalent to bank deposit-taking.

Armstrong appears to be playing both sides of the field. While publicly challenging the banking industry’s framing of stablecoin rewards, Coinbase is simultaneously building partnerships with between 1,000 and 3,000 community banks and credit unions to implement stablecoin technology.

What this means for consumers and markets

The practical question for consumers is whether fully reserved stablecoins are genuinely safer than bank deposits. Armstrong’s argument has merit on the mechanics. A stablecoin backed entirely by US Treasuries doesn’t carry the counterparty risk of a bank that has lent out 90% of its deposits. But bank deposits come with FDIC insurance up to $250K, a safety net that stablecoins don’t offer.

Stablecoins carry their own set of vulnerabilities: smart contract risk, regulatory risk, and the risk that the issuer’s reserves aren’t actually what they claim to be. The collapse of TerraUSD in 2022, which was an algorithmic stablecoin and not a reserved one, still looms large in the public memory.

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