OKX, BlackRock and Standard Chartered Build New Collateral Model for Tokenized Treasuries

OKX will accept BlackRock’s BUIDL fund as yield-bearing trading collateral, with Standard Chartered providing regulated off-exchange custody

DUBAI, April 28, 2026 – OKX has launched a joint framework with BlackRock and Standard Chartered that brings BlackRock’s BUIDL tokenized Treasury fund into institutional collateral workflows.

The arrangement allows eligible OKX VIP and institutional clients to post BUIDL as collateral while the assets remain in regulated custody with Standard Chartered. Clients can trade on OKX Middle East without moving collateral onto the exchange, creating a custody and trading setup designed for institutions that require segregation, yield and operational efficiency.

OKX said the structure is the first off-exchange tokenized collateral framework backed by a globally systemically important bank, or G-SIB, acting as custodian.

BUIDL, BlackRock’s tokenized short-term US Treasury fund, can also be deposited and traded on OKX and used as yield-bearing collateral for margin trading. The fund is tokenized by Securitize, which has announced a proposed business combination with Cantor Equity Partners II, Inc. (Nasdaq: CEPT).

The model brings together BlackRock’s tokenized money market product, Standard Chartered’s regulated custody infrastructure and OKX’s institutional trading and margin systems. For institutional clients, the main benefit is clear: collateral can remain productive while also supporting trading activity.

The framework is built around three core functions:

• Capital efficiency: BUIDL can be used as margin collateral while continuing to generate yield.
• Broader RWA utility: OKX is positioning BUIDL as platform-wide collateral for institutional trading.
• Segregated custody: Assets are held by Standard Chartered, separate from OKX’s balance sheet, while clients retain trading access on OKX.

The launch adds another major use case for tokenized real-world assets, moving them beyond passive holding and into active market infrastructure. It also gives institutions a structure that looks closer to traditional prime brokerage and collateral management, but with tokenized assets operating on blockchain rails.

Haider Rafique, Global Managing Partner at OKX, said the initiative shows how tokenized RWAs can be used in institutional trading at scale.

Margaret Harwood-Jones, Global Head of Financing and Securities Services at Standard Chartered, said the bank’s custody role reflects demand for regulated digital asset infrastructure.

BUIDL is issued on a public blockchain and invests in cash, US Treasury bills and repurchase agreements, with yield distributed on-chain. Its integration into OKX’s collateral system follows institutional testing across trading, margining and liquidity workflows.