One is where the money lives, one is how it moves

Ask a founder who just closed a round which they use, Mercury or Modern Treasury, and you will often get a pause. The two names sit next to each other in the same pitch decks, the same investor Slack channels, the same San Francisco. They both have clean dashboards, both have APIs, both are worth a great deal of money. And they are almost never doing the same thing.

Here is the whole distinction in one line, and it is worth memorizing before the sales calls start. Mercury is where the money lives. Modern Treasury is how the money moves. One is a place to put a balance. The other is a system that decides where that balance goes next, across every account you hold, including the ones that are not Mercury.

Where the money lives

Mercury started in 2017, built by Immad Akhund, Max Tagher and Jason Zhang for a customer everyone else found annoying: the brand-new company with a fresh incorporation certificate and a check to deposit. Traditional banks made that painful. Mercury made it a signup flow. Open an account in an afternoon, spin up as many sub-accounts as you want, wire money without the per-transfer surcharges that legacy banks treat as a revenue line.

The bet paid off in a way that is now hard to argue with. Mercury says it has passed 300,000 business customers and roughly $650 million in annualized revenue, with four straight years of profitability - a phrase that is genuinely rare in a sector that usually treats losses as a growth strategy. In May 2026 it raised $200 million in a Series D led by TCV at a $5.2 billion valuation, up 49 percent from the $3.5 billion it carried just fourteen months earlier.

The important detail is what Mercury is not, yet. It is not a bank. It provides banking services through partner banks - Column N.A. and Choice Financial - and passes FDIC coverage through to customers via sweep networks, up to $5 million. That arrangement is common in fintech and it works, but it also means a layer of someone else's balance sheet sits underneath the product. Which is why Mercury is now chasing its own US bank charter, with final approval floated for around 2027. A charter would let it lend directly, join instant-payment networks, and lean less on partners. It is the move of a company that wants to own the ground it stands on.

A charter is what you go get when you have decided you would rather be the ground than rent it.

How the money moves

Modern Treasury answers a different question, and it is a less glamorous one, which is exactly why it is a good business. The company was founded in 2018 by Dimitri Dadiomov, Sam Aarons and Matt Marcus, who had met at the mortgage marketplace LendingHome, now Kiavi. There they built a retail investing platform that sold more than $300 million of mortgages, and they came away convinced that the genuinely hard part was not the front end. It was the money movement underneath - the initiating, tracking, reconciling and closing of the books that every finance team quietly dreads.

So Modern Treasury built the layer that sits between a company's product and its banks. Instead of learning each bank's file formats and portals, you plug into one API. From there you can push payments over ACH, wire, RTP, FedNow and, increasingly, stablecoins. It opens named US sub-accounts programmatically, keeps a ledger that acts as a single source of truth across systems, runs KYC, KYB, AML and counterparty screening inline, and reconciles bank activity against your records in near real time.

That is a lot of unglamorous words for one plain idea: if your product needs to move money at scale and account for every cent, Modern Treasury is the control panel. Its infrastructure has processed more than $400 billion for companies like Gusto, Navan, Procore, Anchorage Digital and Sling Money. It is valued above $2 billion, and in 2026 it launched Payments, an integrated payment service provider spanning both fiat and stablecoins - a signal that it wants to be the operating system for money movement no matter which rail wins.

Why they get confused

The confusion is understandable. Both companies talk about payments. Both talk about accounts. Both were built for the same customer - the venture-backed company that suddenly has real money to handle. But the overlap is on the surface. Underneath, Mercury is optimizing for a place to keep value, and Modern Treasury is optimizing for the movement of it.

A useful way to see it: many companies use both, and not as a compromise. They keep operating cash at Mercury and use Modern Treasury to orchestrate payouts across Mercury and a handful of other banks at once. The account and the orchestration layer are not rivals on that org chart. They are neighbors.

Two founders, two instincts

Watch what each side optimizes for and the strategies come into focus. Immad Akhund has said publicly that he does not plan to raise again, even while taking $200 million in the door - the posture of someone who wants control and durability, not another headline. Going after a charter fits the same instinct: own the balance sheet, stop renting it.

Dimitri Dadiomov's instinct runs the other way. Modern Treasury keeps adding rails - RTP, then FedNow, then stablecoins - because its value grows with the number of ways money can move through it. One company wants to be a fixed point. The other wants to be the connective tissue between all of them. Both are reasonable. They just answer different questions about where the hard problem actually lives.

Bars scaled to Mercury's valuation. Modern Treasury does not disclose revenue publicly; figures are drawn from company statements and reported funding rounds.

If there is a lesson to steal here, it is not about fintech. It is about product strategy generally. When you look at a market, ask whether you want to be the place where value sits or the layer that acts on it. Mercury chose the first. Modern Treasury chose the second. Both turned out to be worth building. The mistake is only in thinking you have to pick a fight between them.