The Ledger Company Wants to Be the Bank

If your product is the layer that abstracts the bank away from payment operations, what happens when you become the bank?

Modern Treasury has processed over $600 billion in payments for hundreds of organizations. It builds the software that sits between a company's application and the bank that actually moves money. Ledger management, payment routing, reconciliation, compliance workflows. The plumbing between the code and the cash.

On October 5, the company applied to the OCC for a national trust bank charter. Rain, a stablecoin payments infrastructure company, filed the same application the same day.

The obvious read is competitive positioning. More control, more revenue, another fintech tired of sharing margins. But Modern Treasury is infrastructure, not a consumer neobank that outgrew its sponsor bank.

Chime bought Stride Bank for $590 million to remove a dependency on its sponsor. The ledger company applying for a charter is a different move. It collapses an entire tier of the financial stack.

The minimum viable charter

A national trust bank is not a full bank. The distinction matters because it explains why infrastructure companies are converging on this specific vehicle.

The OCC supervises approximately 60 national trust banks, collectively holding nearly $2 trillion in assets in custody and safekeeping accounts. These institutions can provide fiduciary services (managing assets on behalf of clients) and non-fiduciary custody (holding assets without discretionary authority). A March 2026 OCC rule made this explicit, codifying an interpretive letter from the Comptroller's first term.

What trust banks cannot do: take FDIC-insured deposits, make loans, or automatically access a Federal Reserve account. Community Reinvestment Act obligations, deposit insurance premiums, and the regulatory overhead of holding consumer checking accounts all fall outside the charter.

For a company like Chime, with 22 million consumer accounts and a need to hold deposits, a trust bank charter would be useless. Chime needed a full bank. For Modern Treasury, which doesn't hold consumer deposits but needs to custody both fiat and stablecoins under federal supervision, the trust bank is exactly the right scope. It provides the custody authority without the obligations of a business it doesn't run.

That's the architectural insight: the trust bank charter is the minimum viable charter for infrastructure companies. Enough regulatory authority to custody assets directly. None of the weight of full banking.

What changes in the stack

Today, the architecture for a company using Modern Treasury looks roughly like this: the company's application talks to Modern Treasury's API. Modern Treasury routes payment instructions to a partner bank. The partner bank talks to the Fed, ACH, or a clearinghouse. Money moves.

Modern Treasury is the abstraction layer. It makes the partner bank interchangeable. You write to Modern Treasury's API once, and it handles the differences between Chase, JPMorgan, Silicon Valley Bank, or whoever sits underneath. The value proposition is that you never need to think about the bank.

With a trust bank charter, Modern Treasury becomes the bank underneath its own abstraction layer. The partner bank dependency doesn't disappear entirely, since trust banks can't do everything a full bank does. But for custody and settlement of stablecoins and fiat, the company would no longer route through a third party.

CEO Matt Marcus framed it around stablecoins: "We believe stablecoins are foundational economic infrastructure for the future." The charter would connect Modern Treasury's existing payments platform directly to digital asset and fiat custody services, supervised by the OCC instead of relying on third-party custodians.

The settlement chain gets shorter, and the dependency on a third party for custody disappears.

Rain wants the same thing for a different reason

Rain builds stablecoin card, wallet, and money movement programs for partners. Right now, its partner assets are spread across state licenses and third-party custodians, each one a separate regulatory relationship and a separate integration.

Rain National Trust Bank would bring custody, reserve management, and stablecoin issuance and redemption under one federal framework. CEO Farooq Malik said partner institutions want their program assets "held by a fiduciary that answers to a federal regulator."

The architectural motivation is consolidation. Instead of stitching together state-by-state licenses and multiple custodians, one OCC-supervised entity handles the entire custody and issuance layer. For Rain's partners, the integration surface shrinks.

Twenty-one charters and counting

Modern Treasury and Rain aren't early. They're joining a wave.

The OCC has approved or conditionally approved 21 national trust bank charters during President Trump's second term. Thirteen went to crypto-related companies, including Circle, Coinbase, Ripple, BitGo, and Paxos. World Liberty Financial, linked to the Trump family, received one as well.

Block filed for Builders Bank on September 8, 2026. The charter would let Block custody bitcoin and stablecoins under OCC supervision, separate from Square Financial Services, which operates under an industrial loan charter. No deposits, no loans. Just custody.

Two distinct patterns are happening at once. Consumer fintechs are pursuing full bank charters because they need to hold deposits: Chime bought Stride, Revolut secured a conditional US license, Block already had an ILC through Square.

Infrastructure companies are pursuing trust bank charters because they need custody authority, not deposit-taking. Modern Treasury, Rain, Block's Builders Bank, and the crypto firms all landed on the same vehicle. The trust bank charter is becoming the default federal entry point for companies that move or hold assets but don't run checking accounts.

The pushback

The Independent Community Bankers of America sued the OCC on October 2, three days before Modern Treasury and Rain filed their applications. The lawsuit, filed in federal court in Washington, D.C., challenges the March 2026 rule that expanded trust bank charter eligibility.

ICBA's argument is direct: the OCC exceeded its authority under the National Bank Act. Congress created the national trust charter for institutions performing fiduciary activities. The OCC, in ICBA's view, stretched "trust" to cover crypto custody and stablecoin operations that don't look like traditional trust work.

ICBA President Rebeca Romero Rainey put it plainly: "Congress did not create the national trust charter as a side door into the banking system for crypto firms."

The competitive argument is real. Trust banks avoid FDIC insurance premiums, CRA obligations, and the capital requirements that full banks carry. A community bank competing with a trust-chartered crypto firm faces a regulatory cost structure the trust bank doesn't share. ICBA also raised consumer confusion: people might associate a "national bank" charter with the protections of an FDIC-insured institution, which a trust bank doesn't provide.

The lawsuit targets the Protego Holdings conditional charter specifically, but the ruling's implications would reach every trust bank applicant in the pipeline, Modern Treasury and Rain included.

What breaks

The trust bank charter doesn't collapse all of Modern Treasury's dependencies. It can't take deposits, so companies that need to hold customer funds in FDIC-insured accounts still need a traditional banking partner. The charter creates a new entity (Modern Treasury National Trust Bank) separate from the existing software and PSP business. Running a bank, even a limited-purpose one, means OCC examinations, capital requirements (one recent benchmark required $45 million in tier 1 capital), and a compliance apparatus that a software company hasn't needed before.

There's a tension in the positioning. Modern Treasury's value proposition is abstracting the bank away from your payment operations. If Modern Treasury becomes the bank, does the abstraction still hold?

The company says the trust bank is a separate entity, and existing services continue unchanged. But the incentive to route custody and settlement through your own chartered entity, rather than a partner, is structural. The abstraction layer has preferences now.

Rain faces a different risk. Consolidating custody, reserve management, and stablecoin issuance under one entity creates a single point of regulatory failure. If the OCC restricts operations, everything from partner cards to wallet programs to stablecoin redemption runs through the same chokepoint. Spreading across state licenses and multiple custodians is operationally messy, but it's also operationally resilient.

And the ICBA lawsuit introduces timing uncertainty for every applicant. If the court overturns the March 2026 rule, the trust bank path narrows or closes. Modern Treasury, Rain, and Block would need to find alternative regulatory vehicles, none of which offer the same scope at the same weight.

The ledger keeps expanding

A year ago, the ledger was the product. The foundational layer of every fintech application, the schema that determines everything above it. Modern Treasury built the abstraction that made the ledger accessible to companies that couldn't build their own.

Now the ledger company is reaching down into the stack, past the abstraction, past the partner bank, into the charter itself. The question for their customers isn't whether this changes the API. It's whether the company that used to be your vendor is becoming your bank.

Whether Modern Treasury gets the charter depends on the OCC. Whether the charter path itself survives depends on the ICBA lawsuit.

But the architectural trajectory is clear: the companies that built the payment operations layer want to own the layer underneath it. Not the whole bank. Just the custody, the settlement, the piece of the stack that was always someone else's.