Blockchain Group Urges Supreme Court to Review Fed’s Crypto Bank Denial

Custodia Bank just won’t quit. And now, it’s getting a powerful ally to back its last-ditch play. The Blockchain Association, a major crypto industry group, has filed an amicus brief urging the U.S. Supreme Court to hear the digital bank’s case against the Federal Reserve. At stake is more than just one company’s master account. It’s a fundamental question of how—or if—a new breed of financial institution fits within America’s century-old banking plumbing.

For those just catching up, let’s rewind. Custodia, founded by crypto advocate Caitlin Long, applied for a master account with the Federal Reserve Bank of Kansas City back in 2020. This isn’t a checking account. A master account is the golden ticket, providing direct access to the Fed’s payment rails—the system that moves trillions of dollars daily between banks. It’s the backbone of modern finance. Without it, banks must route transactions through another, larger bank that holds one, adding cost, complexity, and risk.

The Kansas City Fed dragged its feet for over 19 months before finally denying the application. The Fed’s Board of Governors later affirmed that decision. Their reasoning, in essence, was that Custodia’s business model—focusing on digital assets and lacking federal deposit insurance—presented too much risk. Custodia sued, alleging the Fed violated the Administrative Procedure Act by engaging in arbitrary and capricious decision-making and exceeding its statutory authority.

The bank lost at both the district court and, this past March, at the Tenth Circuit Court of Appeals. The appeals court judges were unmoved. They found the Fed had broad discretion and that its risk-based denial was “reasonable and reasonably explained.” With those losses, the Supreme Court is Custodia’s final option. The Blockchain Association’s brief, seen by Epochedge.com, argues this isn’t merely a niche crypto dispute. It frames the denial as a threat to financial innovation and competitive fairness, potentially granting Fed officials “unbridled discretion” to pick winners and losers.

The decision below… grants the Federal Reserve boundless authority to exclude institutions from the payment system on the basis of vague and standardless risk assessments, the brief states. It warns this could stifle not just crypto firms but any novel financial entity that challenges the status quo.

Having covered the Fed for decades, I’ve seen this pattern before. New entrants, from industrial loan companies to fintechs, often bang on the gates of the payment system. The gatekeepers, understandably, are cautious. The stability of this system is non-negotiable. A 2023 report from the Bank for International Settlements consistently highlights the contagion risk that poorly regulated entrants can pose to core financial infrastructure. The Fed’s primary mandate is to ensure safety and soundness, not to foster innovation.

But here’s the nuanced tension Custodia’s case exposes. The Federal Reserve Act states that master account access shall be granted to institutions “lawfully entitled thereto.” Does the Fed have the unilateral authority to define what that means beyond the explicit statutes set by Congress? Or, as the Blockchain Association contends, is it constructing new, de facto chartering requirements without clear legislative guidance?

Some legal scholars I’ve spoken to believe the Supreme Court may see this as an overreach of administrative authority, a theme the current Court has been keen to examine. Others point to the Fed’s clear mandate on systemic risk as providing ample cover. A 2022 research paper from the Harvard Law School Program on Corporate Governance noted the increasing use of “risk” as a broad, often subjective, justification for regulatory action in the digital asset space.

The data point that hangs over this entire debate is the sheer speed of change. Traditional bank charter applications are measured in years. The technological and market evolution in crypto and fintech moves in months. The regulatory framework is racing to keep up, and in that gap, institutions like Custodia operate in a liminal space—too bank-like for comfort, but not bank-like enough for a charter.

Custodia’s argument boils down to process and precedent. They claim they followed the rules, applied for the proper state charter in Wyoming (a Special Purpose Depository Institution), and were still shown the door based on what they call shifting, opaque criteria. The Fed, conversely, sees its duty as a proactive one: to guard the gates against any potential threat, even one that operates in a legal gray area.

If the Supreme Court declines to hear the case, the Tenth Circuit’s ruling stands. That would cement the Fed’s expansive discretion in this area, likely chilling similar applications for years. It would send a clear signal that direct access to the core payment system is reserved for entities that look and act like traditional banks. If the Court takes the case and sides with Custodia, it could force a dramatic recalibration, compelling the Fed to establish clearer, more objective rules for access. That would open the door wider for a host of non-traditional players.

The Blockchain Association’s move is a strategic escalation. It signals that the crypto industry is prepared to fight its regulatory battles on multiple fronts, including the highest court in the land. This isn’t just about banking for bitcoin companies. It’s about who gets to participate in the fundamental infrastructure of the American economy. The Supreme Court’s decision on whether to grant review, expected this fall, will be a pivotal signal. It will tell us if the justices believe the Fed’s gates need a closer, constitutional inspection, or if the guardians of the payment system can continue to judge the risk at the threshold, key in hand.

• Custodia Bank’s application for a master account
• The Federal Reserve’s decision timeline
• Legal arguments presented by Custodia
• The Blockchain Association’s involvement
• The implications for financial innovation
• The role of the Supreme Court