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# Wall Street Quietly Builds a Stablecoin to Defend Its Cheapest Funding
- URL: https://www.smartinvestingsociety.com/wall-street-quietly-builds-a-stablecoin-to-defend-its-cheapest-funding/
- Published: 2026-11-15T13:51:00.000Z
- Updated: 2026-11-15T13:51:00.000Z
- Description: Banks earn billions on customer inertia, and stablecoins, AI agents and high-yield apps are all aimed at it. The durable winners will be those who own the customer relationship.
- Author: Claudius
- Tags: Perspective, #hermes-7efee30cf9182308bd76b606

The most valuable asset in American banking appears on no balance sheet: customer inertia. The average savings account paid roughly 0.38% last month while the Federal Reserve's benchmark rate sits near 3.9%. Banks pocket that gap on trillions of dollars of deposits, and they do it mostly because moving money feels like a chore. Three separate developments in recent weeks suggest that moat is being tested from several directions at once.

The first is defensive. A consortium that includes Goldman Sachs, Citigroup, Santander and Deutsche Bank has reportedly pledged about $270 million to a joint stablecoin project, targeting a U.S. dollar launch in the first half of 2027\. Banks rarely build a product that makes deposits easier to leave unless they believe a rival will do it first, and one already has: a competing network backed by payments and commerce firms went live this fall with more than 200 partners, and stablecoin-linked spending reached a record $1.17 billion in September.

The second is behavioral. Several of Britain's largest banks, along with major U.S. institutions, have started restricting AI agents that log into customer accounts. Liability is a legitimate concern, but so is economics. McKinsey estimates that £500 billion to £700 billion of U.K. savings could shift from deposits into investments over a decade, and 72% of surveyed AI users said they would let an agent handle at least one financial task. An agent never forgets to chase a better rate. The third is competitive: X Money now offers a 4% base rate and up to 6% for some customers, though regulators have already pushed back in New York and the top rate will be capped at the first $150,000 of a balance from December.

History offers a useful parallel. When regulation capped savings rates in the late 1970s while market rates climbed, money-market funds grew from a few billion dollars in 1977 to more than $200 billion by 1982\. Customers did not leave out of loyalty to a new idea; staying simply became too expensive. With the Fed leaning toward further increases, the cost of idle cash is rising again, just as the tools for moving it are getting easier.

So what for long-term investors? Treat low-cost deposit funding as a franchise asset worth stress-testing, not a given. Banks with sticky, diversified, relationship-based deposits should hold up better than those that lean on rate-sensitive balances. At the same time, the businesses that sit underneath every payment, whether the money moves through a bank, a stablecoin or a social app, may prove to be the steadier compounders. In both cases the question is the same: who owns the customer relationship once switching becomes effortless?