BUIDL is BlackRock's tokenized money market fund, a share class of US Treasury exposure that lives on public blockchains instead of in a brokerage account. It launched in March 2024 as the asset management giant's first tokenized fund, grew into the flagship of an entire asset class, and sits at about $2.25 billion as of 2 October 2026, per rwa.xyz data. The sharper story is what grew around it. Tokenized Treasuries as a category now hold $14.75 billion, and BUIDL is no longer even the largest fund, which tells you the race BlackRock started has outgrown BlackRock.
Here is what BUIDL actually is, how the yield works, why most readers cannot buy it and what that means in practice, and where the tokenized Treasury wave leaves an ordinary stablecoin holder.
What BUIDL is
BUIDL, formally the BlackRock USD Institutional Digital Liquidity Fund, is a tokenized fund launched with Securitize in March 2024, per BlackRock's own announcement. The fund holds cash, US Treasury bills and repurchase agreements, the classic money market portfolio, and issues its shares as tokens that aim to hold a stable $1 value. Yield accrues daily and pays out monthly as new tokens, so the token count grows while each token stays a dollar.
The token layer is what separates it from the money market fund in your brokerage. BUIDL settles around the clock, transfers between approved holders in minutes, and started on Ethereum before expanding to further blockchains, per CoinDesk. For crypto-native institutions that was the unlock, Treasury yield that lives where their other assets already live, usable as trading collateral and stablecoin backing rather than parked in a separate legacy system.
Why it mattered beyond its size
BlackRock's name did for tokenized Treasuries what its ETF did for Bitcoin, it ended the respectability argument. Within a year of launch BUIDL became the reference collateral of the on-chain dollar economy, backing yield-bearing stablecoins, serving as exchange margin and anchoring the idea that real-world assets settle on chain, the thesis our RWA guide traces from its start.
The market that formed around it is the real subject now. Tokenized Treasury products total $14.75 billion as of 2 October 2026, per rwa.xyz, with Circle's USYC at $2.40 billion and Ondo's USDY at $2.28 billion both edging past BUIDL's $2.25 billion, Franklin Templeton's fund at $1.71 billion behind them, and a long tail of bank and asset-manager entrants from WisdomTree to Kinexys. When our analysis covered RWA's $19.8 billion record, Treasuries were the dominant slice. The category has kept compounding since, and the leaderboard reshuffling at the top is healthy evidence that it is a market rather than a BlackRock product demo.
The yield, honestly described
BUIDL pays whatever short-term Treasuries pay, minus fees. That is the point, not a flaw. It is the on-chain version of the risk-free rate, the baseline every other dollar yield should be measured against. When a platform offers dollar yield far above the T-bill rate, the gap is compensation for some stack of additional risk, credit, strategy, platform or smart contract, and the only question is whether that risk is disclosed and priced. Tokenized Treasuries made that baseline visible on chain, which quietly raised the honesty bar for everyone, a shift our XRPL treasuries piece shows reaching new ledgers.
Why you probably cannot buy it, and what that means
BUIDL is sold to qualified purchasers through Securitize with institutional minimums, not to retail. The same applies to most of the leaderboard, which is built for treasurers, funds and protocols rather than individuals. Retail-accessible wrappers exist, Ondo's USDY among them for non-US investors, with their own eligibility rules, and our Ondo comparison covers that corner of the market in depth.
For most readers the practical exposure to this asset class is indirect, and often already in your pocket. The reserves behind major regulated stablecoins are substantially the same assets BUIDL holds, T-bills and repos, with the difference that the issuer keeps the yield, a structure our stablecoin explainer unpacks. So the retail question is not how to buy BUIDL. It is where a dollar should sit to earn, given that the T-bill baseline is roughly what BUIDL yields and everything above it is priced risk.
That is a portfolio question with honest answers at each tier. Treasury-wrapper products pay the baseline with issuer and eligibility constraints. DeFi money markets pay variable rates above it with smart contract risk. Managed platforms pay published rates with platform and strategy risk, EarnPark among them at up to 10% APY on USDC, via its low-risk market-making and medium-risk lending strategies, and up to 15% APY on USDT via a high-risk trading strategy with monthly settlement, base rates for every account holding zero PARK, with the live USDC rates comparison mapping how those offers stack against the market. The spread between any of those numbers and the T-bill rate is the risk you are being paid to hold, and deciding that the baseline is enough for you is a fully respectable answer. For the part of an allocation where the priced risk makes sense, the start earning flow covers the rest.
FAQ
What is BlackRock BUIDL in simple terms?
A money market fund whose shares are blockchain tokens. It holds cash, T-bills and repos, keeps each token at $1, and pays the fund's yield as new tokens monthly. It brought BlackRock's brand to on-chain finance and became the reference asset of tokenized Treasuries.
Can retail investors buy BUIDL?
No. It is offered to qualified purchasers through Securitize with institutional minimums. Retail routes into the same asset class run through eligible wrapper products like USDY where jurisdiction allows, or indirectly through the T-bill reserves backing regulated stablecoins.
What yield does BUIDL pay?
Short-term US Treasury yield minus fund fees, accrued daily and distributed monthly in tokens. It tracks short-term US interest rates, so the figure moves with Fed policy rather than with crypto markets.
Is BUIDL still the largest tokenized Treasury fund?
Not as of early October 2026. Circle's USYC and Ondo's USDY both sit slightly ahead of BUIDL's roughly $2.25 billion, per rwa.xyz, in a category totalling about $14.75 billion. The lead has changed hands repeatedly, which reflects how fast the whole market is growing.