BlackRock USD Institutional Digital Liquidity Fund

The BlackRock USD Institutional Digital Liquidity Fund (BUIDL) is a tokenized money market fund issued by BlackRock, the world's largest asset manager, in partnership with the tokenization platform Securitize. Launched in March 2024, it was BlackRock's first tokenized fund on a public blockchain and quickly became one of the largest tokenized US Treasury products, a milestone in bringing traditional financial instruments on-chain.

BUIDL represents shares in a fund that invests in cash, US Treasury bills, and repurchase agreements. Each token is designed to maintain a stable value of one US dollar, while the yield generated by the underlying assets is paid out to holders as newly issued tokens through regular dividend distributions. In this way BUIDL behaves like a blockchain-native version of an institutional money market fund share.

How it works

BUIDL is not a mined or staked cryptocurrency; it is a security token whose supply grows and shrinks as investors subscribe to or redeem from the fund, so there is no fixed maximum supply. The fund originally launched on Ethereum and has since been extended to additional networks, including Solana, Avalanche, Polygon, Arbitrum, Optimism, and Aptos. Access is restricted: tokens can only be held and transferred by investors who have been approved through Securitize's onboarding and compliance process, and participation is aimed at qualified institutional investors rather than the general public.

Role in the ecosystem

BUIDL sits at the center of the real-world asset (RWA) trend — the effort to represent traditional financial instruments on public blockchains. It gives institutions a way to hold a yield-bearing, dollar-denominated instrument with on-chain settlement, and it is used as reserve backing and collateral by other crypto products. Its growth is often cited as evidence of institutional adoption of tokenization.