Mercury remains deposit-driven

Mercury still lives and dies mostly by what happens to rates, not by customer software spend. Even after adding paid tools, consumer banking, and card revenue, the core engine remains yield on a very large deposit base. That means diversification has to grow fast enough to matter at hundreds of millions of revenue scale, and today the evidence shows those newer lines are still much smaller than deposit driven income.1 2 3

• At $500M annualized revenue in 2024, most of Mercury’s revenue came from sharing interest income on roughly $20B of deposits with partner banks. The same research describes interchange and $35 to $350 per month software as smaller lines, which shows how large non rate revenue must become before it can offset a rate cut cycle.1
• Mercury’s own business model framing listed four revenue streams in 2023, deposits, card interchange, fees on wires and FX, and venture debt. That mix matters because only one of those, deposits, scales instantly with balances and rates. The others grow customer by customer, card swipe by card swipe, or loan by loan.2
• Compared with peers, Mercury’s mix is still unusually concentrated. Research comparing fintech models estimated roughly 90% of Mercury revenue came from deposit interest and about 10% from interchange, while Brex already had a broader split across interchange, deposits, and SaaS. That makes Mercury more exposed if deposit yields reset before newer products mature.3

The path forward is clear. Mercury has to turn banking product usage into routine fee revenue, more paid seats, more card spend, more money movement, and more attached services per customer. If it does that before the next major easing cycle, it can look less like a rate trade and more like a durable finance software platform.1 2 4