Crypto custodians hold others’ digital assets and therefore concentrate financial, operational and legal risk. Agustín Carstens Bank for International Settlements has repeatedly urged that crypto intermediaries be subject to prudential standards comparable to traditional financial institutions, because failures can cascade across markets and jurisdictions. A clear, evidence-based capital standard reduces insolvency risk, protects retail clients, and preserves public trust.
Recommended minimum framework
A prudent baseline is a risk-based capital requirement anchored to existing banking norms, supplemented by custody-specific buffers. Concretely, custodians should maintain at least a common equity tier 1 (CET1) equivalent of 8 percent of risk-weighted assets, mirroring Basel minimums, plus an additional operational and cyber buffer of 4 to 6 percentage points to reflect concentrated custody and technology risks. This produces a working minimum of roughly 12–14 percent of risk-weighted assets for systemic or high-volume custodians. The Financial Stability Board supports risk-sensitive approaches that account for crypto-specific vulnerabilities, including market liquidity and operational failure modes. Segregation of client assets must be mandatory, and capital must not be used to back proprietary trading.
Liquidity, absolute loss-absorption and territorial nuance
Beyond ratios, custodians should carry liquid capital sufficient to meet client withdrawal demands and remediation costs for a sustained stress period. A practical rule is liquid assets equal to all unencumbered client liabilities plus operational runway for several months, because crypto runs can be faster and cross-border legal clarity is often limited. Jurisdictional fragmentation matters: smaller markets with limited legal protections often require higher absolute capital and stricter custody practices to protect retail savers and local financial stability.
Consequences of undercapitalization include loss of client funds, legal disputes across territories, reputational harm to the broader industry, and higher regulatory intervention costs. Well-calibrated capital rules that combine risk-weighted minimums, operational buffers, strict asset segregation, and robust liquidity hold-ups balance resilience with market access. Policymakers should phase-in requirements and align them internationally to avoid regulatory arbitrage while allowing cultural and territorial legal differences to inform the exact calibration. Prudence today reduces systemic and human costs tomorrow.