BlackRock, Standard Chartered Back OKX Tokenized Treasuries

BlackRock and Standard Chartered are part of a framework OKX announced on April 28, 2026 that allows certain investors to use a tokenized U.S. Treasury fund as trading margin and collateral while keeping the underlying securities in bank custody.

Under the arrangement, OKX accepts BUIDL, a tokenized fund issued on public blockchain rails, as margin across its trading platform. BUIDL allocates assets mainly to cash, short‑dated U.S. Treasury bills and repurchase agreements and benchmarks yield to the U.S. Federal Funds rate.

Standard Chartered will hold the underlying securities in regulated off‑exchange custody. The bank’s custody keeps legal title and settlement outside the exchange environment while supporting tokenized trading access on OKX.

BUIDL distributes earnings to token holders and supports transfers among approved participants. That design lets holders continue to earn yield on the underlying instruments while tokens are used as collateral on the exchange.

OKX said in a statement, “Qualified investors can deploy BlackRock’s BUIDL, a tokenized U.S. Treasury fund issued on public blockchain rails, as trading collateral on OKX while continuing to earn U.S. dollar yield benchmarked against the U.S. Federal Funds rate.”

The framework includes rules for transfers between approved counterparties and limits participation to qualified investors. OKX described the setup as linking its trading and margining infrastructure with off‑exchange custody to avoid moving assets between custodial accounts and trading venues.

BlackRock designed BUIDL to maintain a stable exposure profile by concentrating on cash and government‑backed instruments and using repurchase agreements to manage short‑term liquidity and yield.

OKX said the arrangement combines BlackRock’s tokenized Treasury fund, Standard Chartered’s regulated custody and OKX’s trading infrastructure. The exchange made the framework available as an option for institutions seeking to keep capital deployed in market instruments while using tokenized exposure in digital trading workflows.