The BlackRock USD Institutional Digital Liquidity Fund (BUIDL) is a tokenized fund introduced by BlackRock, designed to offer institutional investors stable U.S. dollar yields through blockchain technology. Launched initially on the Ethereum network, BUIDL has expanded to multiple blockchains, including Aptos, Arbitrum, Avalanche, Optimism's OP Mainnet, and Polygon. The fund invests entirely in cash, U.S. Treasury bills, and repurchase agreements, aiming to maintain a stable value of $1 per token. Investors receive daily accrued dividends directly to their digital wallets as new tokens each month. BUIDL has surpassed $500 million in assets under management, making it one of the largest tokenized treasury funds globally.