Abstract institutional collateral rails representing tokenized Treasury funds and crypto trading infrastructure.

BlackRock’s BUIDL Fund Goes Live as Yield-Bearing Collateral on OKX, With Standard Chartered Holding Custody

By Isaac • May 1, 2026 10:39 am • Comments

BlackRock’s BUIDL tokenized U.S. Treasury fund is now live as trading collateral on OKX. Qualified institutional clients can post BUIDL as margin while continuing to earn U.S. dollar yield benchmarked against the Federal Funds rate. Standard Chartered is providing regulated custody for the arrangement.

The three-way framework, announced April 28, connects BlackRock’s tokenized Treasury exposure, Standard Chartered’s bank custody, and OKX’s institutional execution and margining infrastructure into a single workflow. Standard Chartered described it as the first time a globally systemically important bank has acted as custodian in this kind of off-exchange tokenized collateral setup.

Trending: MARA Buying a 505 MW Gas Plant and 1,600 Acres in Ohio for $1.5 Billion

BUIDL invests in cash, U.S. Treasury bills, and repurchase agreements, with yield distributed on-chain. The fund has been one of the flagship tokenized real-world asset products since BlackRock launched it, and this framework gives it a concrete use case inside exchange margin systems. Collateral that earns yield while it works is a meaningful upgrade over idle capital sitting in a margin account.

OKX laid out the collateral framework in its April 28 announcement:

OKX said the framework with BlackRock and Standard Chartered lets qualified investors deploy BUIDL as collateral on OKX while maintaining U.S. dollar yield exposure tied to the Federal Funds rate. BUIDL can be held in regulated custody with Standard Chartered while supporting trading activity on OKX, or deposited on-exchange and used as yield-bearing collateral for margin trading. The structure connects BlackRock’s tokenized Treasury fund exposure, Standard Chartered’s regulated bank custody, and OKX’s institutional execution and margin infrastructure in one workflow. OKX framed the model as a way for institutions to keep capital in high-quality short-term Treasury exposure, earn yield while collateral is deployed, and move between custody, trading, and collateral management without losing operational continuity. The company said the framework is available through OKX Middle East for VIP and institutional clients. OKX also said the underlying exposure remains anchored to cash, U.S. Treasury bills, and repurchase agreements, the same instruments institutions already use for liquidity management.

The custody angle is significant. Standard Chartered said OKX VIP and institutional clients can post BUIDL as collateral held off-exchange in regulated custody while trading on OKX Middle East. Having a G-SIB hold the collateral rather than the exchange itself addresses one of the oldest institutional objections to crypto trading: counterparty risk at the exchange level. Funds stay under bank custody while still functioning as margin.

Tokenized Treasuries have been discussed for years as a way to bring traditional fixed-income instruments on-chain. The early products proved the concept. What this framework adds is a real operational loop: hold a tokenized Treasury, earn yield on it, and simultaneously use it as margin for exchange trading, all while a major bank provides custody. That loop turns tokenized RWAs from a balance-sheet curiosity into functional trading infrastructure.

For now, this is an institutional product available to qualified clients through OKX Middle East. The framework still needs to prove itself in live trading volumes and stress conditions. But when BlackRock, Standard Chartered, and a top-tier exchange build plumbing together, the signal is clear: the institutions that spent 2024 and 2025 testing tokenized assets are now wiring them into margin and collateral systems where they can actually do work.

Join the conversation!

We have no tolerance for comments containing violence, racism, profanity, vulgarity, doxing, or discourteous behavior. If a comment is spam, instead of replying to it please click the icon below and to the right of that comment. Thank you for partnering with us to maintain fruitful conversation.

 

Search ProCoinNews