OKX, BlackRock, and Standard Chartered announced on April 28, 2026, a joint framework enabling institutional and VIP clients to use BlackRock’s tokenized US Treasury fund BUIDL as yield-bearing collateral for trading on OKX, with Standard Chartered acting as regulated off-exchange custodian. The arrangement is described by the parties as the first of its kind backed by a globally systemically important bank, and marks a substantive step in embedding real-world asset tokenization into institutional trading infrastructure.
Key Facts At A Glance
- The joint framework was announced on April 28, 2026, from Dubai, by OKX, BlackRock, and Standard Chartered
- BlackRock’s USD Institutional Digital Liquidity Fund (BUIDL), valued at approximately US$2.5 billion, serves as the collateral asset; BUIDL is tokenized by Securitize and invests in cash, US Treasury bills, and repurchase agreements
- This is the first time a globally systemically important bank (G-SIB) has acted as custodian in an off-exchange tokenized collateral framework for a crypto trading venue
- The framework is initially available to OKX VIP and institutional clients trading on OKX Middle East, operating under the Virtual Assets Regulatory Authority (VARA) in Dubai
- Standard Chartered holds client collateral in segregated, regulated custody that is separate from OKX’s own assets, providing exchange default protection
- BUIDL’s yield is benchmarked to the US Federal Funds rate and continues to accrue while the asset is deployed as collateral
- OKX maintains a Singapore office and holds a Major Payment Institution licence from the Monetary Authority of Singapore; Standard Chartered’s institutional digital asset custody infrastructure spans the UAE, Europe, and Asia
- The broader tokenized real-world asset market has grown to approximately US$30 billion, up roughly 400% since the start of 2025, according to data cited by industry analysts
A New Collateral Model For Institutional Digital Asset Markets
OKX, BlackRock, and Standard Chartered launched a joint tokenized collateral framework on April 28, 2026, integrating BlackRock’s BUIDL fund into the margining and collateral workflows of OKX’s institutional trading platform. The announcement, made from Dubai and confirmed through official press releases from Standard Chartered and OKX, describes a structure allowing qualified investors to post BUIDL as trading collateral while it remains held in regulated custody at Standard Chartered, off the exchange’s own balance sheet.
The framework operates in two modes. In the first, clients post BUIDL as off-exchange collateral held at Standard Chartered’s Dubai International Financial Centre entity, while trading on OKX Middle East without transferring asset ownership to the exchange. In the second, BUIDL can be deposited directly on OKX and used as yield-bearing margin for trading activities. In both configurations, the fund continues to generate Treasury yield for the holder.
The Capital Efficiency Argument
The framework addresses a long-standing structural inefficiency in institutional crypto markets. Cash and stablecoins posted as trading margin have historically generated no return for the holder, while the same capital deployed in a US Treasury money market fund could earn 4 to 5 percent annually in the current rate environment. By allowing BUIDL to function as active collateral without being liquidated, the framework converts what would otherwise be idle margin into a productive Treasury position.
Standard Chartered holds client assets in segregated custody, separated from OKX’s own assets. This structure provides exchange default protection: if OKX were to experience a default event, client collateral held at Standard Chartered would not form part of the exchange’s estate. OKX manages real-time margining and liquidation through its own internal risk systems, while Standard Chartered’s custody operations provide the regulated safekeeping layer.
Samara Cohen, Global Head of Market Development at BlackRock, said the framework allows qualified investors to unlock new opportunities in how they deploy collateral. Haider Rafique, Global Managing Partner at OKX, described tokenization as making existing markets faster, more transparent, and more accessible. Margaret Harwood-Jones, Global Head of Financing and Securities Services at Standard Chartered, said the bank’s role reflects a commitment to delivering trusted solutions as the financial ecosystem evolves.
BUIDL’s Exchange Integration History And Market Context
BlackRock’s BUIDL fund was launched in March 2024, making it BlackRock’s first tokenized fund issued on a public blockchain. It was tokenized by Securitize and initially issued on Ethereum. As of late April 2026, BUIDL held approximately US$2.5 billion in assets, making it the largest tokenized money market fund by assets under management.
The OKX integration is the third major crypto exchange to onboard BUIDL as collateral within a six-month period. Crypto.com and Deribit integrated BUIDL in June 2025, followed by Binance in November 2025. BUIDL has also been integrated as collateral into DeFi platforms including Aave V4 and Sky, formerly MakerDAO. Approximately 30 percent of tokenized Treasuries held on-chain, representing roughly US$2.2 billion, are now actively deployed as collateral in DeFi or exchange environments rather than held passively.
The OKX-Standard Chartered custody relationship predates this specific framework. Standard Chartered was appointed as OKX’s institutional third-party custodian in August 2025, initially covering global institutional clients. The partnership was subsequently extended to the European Economic Area in October 2025, following Standard Chartered’s MiCA-compliant regulatory approval in Luxembourg. The BUIDL collateral framework represents the next phase of that existing institutional relationship, now applied to real-world asset tokenization within the Middle East operational perimeter.
Standard Chartered’s Asia Custody Infrastructure And Regional Relevance
Standard Chartered is headquartered in London and operates across 54 markets, with significant institutional infrastructure across Asia. The bank’s Financing and Securities Services division, led globally by Harwood-Jones, has positioned digital asset custody as a strategic growth area. OKX maintains a Singapore office and holds a Major Payment Institution licence from the Monetary Authority of Singapore, establishing a regulatory presence in the region that complements its Middle East and European operations.
The IMF issued a caution in April 2026 that moving trading infrastructure onto blockchain-based systems could accelerate financial crises beyond regulators’ ability to respond, a critique aimed directly at the category of integration represented by the BUIDL framework. That regulatory position is expected to shape policy conversations around tokenized collateral through the remainder of 2026, particularly as institutional adoption accelerates across APAC markets where tokenization frameworks are still being developed.
Publicly available information on specific margin call mechanics during periods of market stress, or the precise timeline for extending the framework beyond OKX Middle East to other regions including Asia, has not been disclosed by the parties.