Modern Treasury has asked the federal bank regulator, the Office of the Comptroller of the Currency, for permission to set up Modern Treasury National Trust Bank, a limited-purpose federal trust bank that would add stablecoin and digital asset custody to the payments platform that has powered more than $600 billion in payments. The company announced the filing on 5 October 2026. According to the company, the proposed Modern Treasury trust bank would neither lend nor issue stablecoins.

What the Modern Treasury trust bank would do

The company describes a unified custody product that sits next to its existing payment and settlement software, so a customer could hold and move stablecoins and fiat in one place. Chief executive Matt Marcus says stablecoins are fully integrated into the platform and that the charter would add federally supervised custody to infrastructure customers already use.

The structure is deliberately separated. Modern Treasury’s software and its payment service provider business would carry on as they are, while the bank would be a distinct entity providing only what the OCC authorises. The release states that nothing changes for customers, bank partners or stablecoin partners until approvals arrive, and that the bank will not open without final OCC authorisation. Existing investors named by the company are Benchmark, Altimeter and Salesforce Ventures.

Fintechbits analysis

Why the timing matters for the charter route

The filing arrives three days after the community bank trade group ICBA filed suit against the OCC and Comptroller Jonathan Gould in federal court in Washington. According to Banking Dive’s report on the complaint, the trade group argues the agency has exceeded its statutory authority, and it asks the court to void an OCC rule and a 2021 interpretive letter on which trust charter approvals rest. The complaint counts 21 national trust bank charters that the agency has approved in full or on conditions during the second Trump term, 13 of them for crypto companies.

Those figures are the ICBA’s, not the OCC’s, and the agency told Banking Dive it does not comment on litigation. Still, they show how crowded the route has become. Block applied on 8 September 2026 for Builders Bank Trust, N.A., as Fintechbits reported, and Modern Treasury is another payments company choosing a federal custody charter over a patchwork of state licences. The ICBA’s core argument is that a crypto trust bank is neither a depository nor a fiduciary, which is where a custody-only bank with no lending will be tested hardest.

Custody design and the questions the filing skips

The release says nothing about how custody would be structured. It does not say whether customer assets would be held on chain, which stablecoins would be supported, or whether the bank would hold reserves for any issuer. It also does not address the lawsuit, which is the largest open question for any applicant.

The ICBA complaint says trust banks are not subject to the Community Reinvestment Act or deposit insurance assessments, and it cites two community bank members that each spend about $1.5 million a year on those obligations. Modern Treasury is silent on whether it would voluntarily accept any comparable obligations. That silence matters because the strongest political case against these charters is competitive fairness.

Fintechbits’ view: the plan makes commercial sense, and the legal exposure is real. Custody is a clean use of a trust charter and avoids the deposit-taking question, but a company that already moves $600 billion across fiat and stablecoin rails will draw attention precisely because it sits so close to payments. Fintechbits has also covered the company’s stablecoin work with Depa Finance, which selected Modern Treasury to power cross-border payments across US dollar rails and stablecoins.

What to Watch Next

Two events decide this. The first is whether the OCC grants conditional approval to the Modern Treasury trust bank and under what capital and activity conditions. The second is whether the District of Columbia court takes up the ICBA’s request to rescind the Protego Holdings charter, because that ruling will signal whether any of these approvals can be relied on.

Questions and answers

What has Modern Treasury applied for?

Modern Treasury has applied to the OCC for a charter for Modern Treasury National Trust Bank, a limited-purpose national trust bank for digital asset custody and related fiat services. The company says it would not make loans or issue stablecoins.

Will the Modern Treasury trust bank change the existing payments platform?

No change is planned, according to Modern Treasury. Its software and payment service provider business continue separately, and the bank cannot operate until the OCC gives final authorisation.

Why is the ICBA lawsuit relevant to Modern Treasury?

The ICBA sued the OCC on 2 October 2026 over the rule and interpretive letter behind trust charter approvals. If the court agrees with the trade group, the route Modern Treasury is applying through could be narrowed.