Preface

Context: Major custody banks and digital‑asset firms are exploring ways to keep U.S. Treasury markets running beyond traditional weekday hours. This piece summarizes BNY Mellon’s recent after‑hours experiment using stablecoin reserves, its plans to trial tokenized Treasuries on a private blockchain, and its multi‑year roadmap to enable continuous settlement. The purpose is to explain the operational challenge — the weekend and overnight settlement gap — and how a combination of existing cash rails, tokenization and extended connectivity could address it. The article aims to give readers a clear, neutral view of what the test demonstrated and what BNY intends to deploy by 2027.

Lazy bag

BNY Mellon successfully executed an after‑hours Treasury trade using stablecoin reserves, showing that settlement activity tied to digital token reserves can continue outside standard Fedwire hours. Key takeaway: the experiment used reserves from Ripple’s RLUSD and OpenEden’s USDO and settled via existing cash rails, pointing to a practical path toward 24/7 settlement for both conventional and tokenized Treasuries by 2027.

Main Body

The U.S. Treasury market traditionally relies on weekday settlement windows driven by systems such as Fedwire Securities. While trading can occur in many time zones, the actual transfer of Treasury securities and cash historically pauses when the primary settlement infrastructure closes. That schedule creates a mismatch for digital tokens that claim continuous trading — particularly stablecoins that hold short‑dated Treasuries as backing assets. When users mint or redeem tokens at scale outside standard settlement hours, reserve positions behind those tokens cannot always be adjusted immediately, producing operational and liquidity risks.

BNY Mellon, the world’s largest custody bank, recently carried out a proof‑of‑concept trade after official Fedwire Securities processing had ended for the day. The transaction involved reserves tied to two stablecoin issuers — Ripple’s RLUSD and OpenEden’s USDO. In the reported experiment, Ripple participated directly while BNY’s Dreyfus unit acted on behalf of OpenEden. Execution was handled through Tradeweb, and settlement completed shortly after using BNY’s existing cash rails despite the Fedwire window being closed.

Although the Treasuries in that particular transaction were not tokenized, the test demonstrated two important points. First, Treasury‑related activity can be supported outside the conventional settlement hours when counterparties and custodians coordinate and use available cash settlement pathways. Second, the mechanics used in the test are compatible with tokenized representations of securities, suggesting a route for combining tokenization with extended settlement connectivity.

BNY has signaled a structured path forward. By year‑end, the bank intends to begin testing tokenized U.S. Treasuries on a private blockchain environment. This will allow controlled experimentation with on‑chain transfer of tokenized securities while managing custody, reconciliation and regulatory requirements. Separately, BNY plans to expand its settlement network to better align with a broader set of global trading hours, covering more of the Asian and European trading days in addition to U.S. hours. That expansion aims to reduce the time difference between when tokenized assets trade and when the underlying reserve adjustments can be made.

BNY’s involvement is notable because it already serves as primary custodian for some stablecoin reserve portfolios and provides custody and investment management services for tokenized Treasury funds. The bank also introduced tokenized deposit balances earlier in the year, providing institutional clients with on‑chain representations of commercial bank money. Those existing relationships and capabilities position BNY to coordinate between custody, cash management and blockchain testing — all necessary components for a safe shift to round‑the‑clock settlement.

There are several operational and market considerations to keep in mind. Settlement outside traditional windows requires robust intraday liquidity management, risk controls for short‑term credit exposures, and precise coordination across custodians, trading venues and payment systems. Regulatory expectations — especially around custody of government securities and the safekeeping of client assets — will also shape how tokenized and conventional Treasuries can be settled 24/7. Any solution must maintain transparency, auditability and compliance with existing securities laws.

From the standpoint of stablecoin issuers, continuous trading of tokens can create a mismatch because the assets backing those tokens (short‑dated Treasuries) remain subject to weekday settlement constraints. When token supply changes rapidly outside those windows, issuers may be unable to reallocate reserves immediately, exposing them to potential liquidity stress or delayed collateral adjustments. The BNY experiment indicates that, with coordination and alternate cash rails, reserve adjustments can still be effected outside standard settlement hours — reducing that mismatch.

For market infrastructure providers and trading venues, the path to 24/7 settlement involves both technological and market‑structure changes. Tokenization can enable near‑instantaneous transfer of ownership on a blockchain, but the underlying custody and legal frameworks must ensure the tokenized instrument is legally equivalent to its conventional counterpart. Additionally, settlement networks and payment channels need to interoperate reliably across time zones. Pilot programs — such as BNY’s private‑blockchain tests and expanded settlement windows — will be important to identify frictions and develop standardized procedures.

By targeting a 2027 timeline for supporting round‑the‑clock settlement of both conventional and tokenized U.S. Treasuries, BNY Mellon is signaling a multi‑year effort that combines technology pilots, operational upgrades and expanded market connectivity. If successful, such a shift could reduce weekend and overnight liquidity mismatches, better align tokenized products with continuous trading expectations, and provide institutional participants with greater flexibility for global markets.

Ultimately, the transition to 24/7 settlement will require industry coordination, clear regulatory engagement, and thorough testing to ensure that risks are managed. BNY’s recent after‑hours trade and forthcoming blockchain trials provide a pragmatic starting point that demonstrates feasibility while highlighting the complexities that must be resolved before continuous Treasury settlement becomes routine.

Key Insights Table