What Is BlackRock’s BUIDL Fund? A Beginner’s Guide To Tokenized Money Markets

Traditional finance (TradFi) and decentralized finance (DeFi) are increasingly converging. 

Since its inception, DeFi has drawn on core TradFi concepts to build a parallel financial system on blockchain rails.

Now, TradFi meets DeFi systems are discovering meeting points—shared spaces where traditional structure blends with blockchain innovation.

As blockchain technology advances and adoption grows, large institutions are integrating DeFi tools into their systems to offer more flexible options powered by blockchain.

One of the most notable moves comes from BlackRock, the world’s largest asset manager. With its BUIDL BlackRock signals that the future of finance may run on both centralized and decentralized infrastructures.

This article covers BlackRock’s BUIDL product, explains the basics of tokenized money markets, and explores how the fund operates across Ethereum and other blockchain networks.

Blackrock’s BUIDL Fund, Explained

BUIDL stands for the BlackRock USD Institutional Digital Liquidity Fund. BUIDL is a tokenized money market fund (MMF) run by BlackRock. Securitize, LLC, a registered transfer agent, manages the fund’s tokenization or issuance, compliance, and trading of BUIDL tokens.

BUIDL marks a major step in bridging TradFi with fintech because it transforms traditional MMF into a digital format using blockchain technology.

Since its launch in March 2024, BUIDL has scaled rapidly, surpassing $1 billion in assets under management by early 2025.

As of mid-2025, its market cap / TVL sits above $2.1 billion per DeFiLlama metrics.

What Are Tokenized Money Market Funds?

Tokenized money market funds (MMFs) are traditional low-risk assets—like U.S. Treasury bills and cash—represented as digital tokens on a blockchain. Each token corresponds to a share of the fund, allowing investors to buy fractional portions. This makes it easier to access these funds with less capital, opening the door to broader participation.

They offer the same benefits as traditional MMFs—low-risk investments that aim to preserve capital and provide steady returns, with added advantages from blockchain technology:

• Smaller entry points: Investors can buy fractional fund shares, lowering the capital needed to participate
• Automated processes: Smart contracts pay interest, handle withdrawals, and manage compliance checks, cutting down on manual work.
• DeFi compatibility: Investors can use the tokens as collateral in DeFi platforms, expanding their utility beyond traditional markets.
• On-chain yield: BUIDL pays daily interest directly to crypto wallets, offers near-instant transaction settlement, full transparency, and 24/7 accessibility. Over its first months, BUIDL cumulatively distributed about $7 million in dividends to token holders.

How BUIDL Works On The Ethereum Network

BUIDL originally launched on Ethereum, but has since expanded to multiple blockchains, including Solana, Polygon, Optimism, Arbitrum, Avalanche, and Aptos.

To support multi-chain access, BUIDL uses Wormhole, a cross-chain messaging protocol. Wormhole lets BUIDL tokens move between different blockchains. Leverage of Wormhole enables seamless token transfers across these chains, maintaining liquidity and interoperability.

BUIDL tokens are easy to track, transfer, and manage on-chain.

This is how this on-chain investing model works:

• Tokenized shares: Each token equals one share in the fund and is recorded on the blockchain.
• Smart contract automation: Smart contracts pay interest daily, handle redemptions (meaning investors can cash out their tokens for U.S. dollars), and manage other tasks with no manual work.
• Wallet-based access: Investors hold their tokens in crypto wallets they control.
• Redemptions in USD: While investors often use USDC to buy BUIDL tokens, redemptions are usually paid out in U.S. dollars. The smart contract handles the process of selling tokens back to the fund and receiving the equivalent cash value.
• On-chain transparency: Every token movement and transaction is public and verifiable on the blockchain.
• Daily dividend accrual: The fund earns interest each day and pays it out as new tokens at the beginning of each month.
• Flexible custody: Investors can choose where to keep their tokens using providers like Anchorage Digital Bank NA, BitGo, Coinbase, or Fireblocks.
• USDC-backed assets: Each BUIDL token is designed to maintain a $1 value, fully backed by U.S. Treasury bills, cash, and repurchase agreements. To invest, users must be verified by Securitize and use USDC for purchases.

Inside BUIDL’s Real-World Asset Ecosystem

BUIDL brings real-world assets (RWA)  (like U.S. Treasuries and cash) onto the blockchain through tokenization. 

To make it possible, BlackRock connects with a network of trusted partners and tools—each playing a specific role. 

The chart below shows how BUIDL works from issuance to custody, highlighting how traditional finance and blockchain infrastructure come together:

BUIDL Snapshot: Growth, Peak, and Recent Outflows

Since launching in March 2024, BlackRock’s BUIDL has seen explosive adoption, cementing itself as the largest tokenized U.S. Treasury fund on-chain. Growth was particularly sharp in early 2025, when institutional inflows drove its assets from hundreds of millions into the multi-billion range. 

By mid-2025, BUIDL had peaked at nearly $2.9 billion in value, securing over 40% of the tokenized Treasury market and gaining traction as accepted collateral on major trading platforms like Crypto.com and Deribit. 

Yet, momentum has recently cooled: in August 2025 the fund faced its steepest pullback to date, with roughly $447 million in net outflows, concentrated in the Ethereum-based BUIDL-I share class. 

Despite this correction, BUIDL remains the benchmark for institutional on-chain yield and a bellwether for the tokenized real-world asset sector.

Key Highlights:

• Rapid growth: Launched March 2024, reached $1.8B+ within its first year.
• Peak: Hit a high near $2.9 billion TVL by mid-2025, commanding 42% of the tokenized Treasury space.
• Adoption: Now accepted as collateral on Deribit and Crypto.com, expanding its utility beyond passive yield.
• Dividends: Paid out over $7 million in cumulative dividends since inception, including a record $4.17 million in March 2025.
• RLUSD off-ramp: Ripple and Securitize have launched a smart contract integration that lets holders of BUIDL and VBILL (VanEck’s tokenized treasury fund) swap their tokens for RLUSD (Ripple’s U.S. dollar stablecoin).
• Recent outflows: Saw $447 million net outflows in August 2025 (-15% MoM), driven largely by redemptions in the Ethereum-based share class.
• Current standing: Even after outflows, BUIDL still manages over $2.4 billion, maintaining its lead in the RWA tokenization sector.

Benefits For Investors And Institutions

BUIDL brings money market funds on-chain, reshaping access, control, and efficiency in a regulated environment. As a result, it offers clear advantages that go beyond traditional platforms.

• Faster payouts: The fund adds interest daily. Investors see their returns without delays.
• More control: Investors can hold their tokens directly or pick a trusted custodian.
• Easy tracking: Tokens sit in the same wallet as other digital assets, so everything stays in one place.
• Lower risk exposure: BUIDL connects to safe assets like U.S. Treasuries—but as tokens.
• Chain flexibility: BUIDL runs on multiple blockchains, so users can stay on the network they prefer.
• Enables capital efficiency: BUIDL is now accepted as collateral in trading platforms like Crypto.com and Deribit, allowing holders to deploy it in yield / derivatives strategies.
• Built for compliance: BlackRock and Securitize follow U.S. rules, making it easier for institutions to take part.

Who Can Invest In BUIDL: Accredited Access and Strict Compliance

BUIDL runs under strict rules. The fund follows U.S. securities laws and is only open to accredited and institutional investors. The minimum subscription is $5 million USDC and the redemption minimum is $250,000, as per the issuer’s data. Transfers are limited to wallets that pass know-your-customer (KYC) checks and appear on an approved whitelist. 

Securitize Markets manages investor access to the fund. To join the whitelist, individuals typically must qualify as Qualified Purchasers—often requiring a minimum investment of $5 million. The fund is registered with the U.S. SEC.

This setup shows a strong focus on meeting regulatory standards, including anti-money laundering (AML) rules and secure custody.

BUIDL Vs. Franklin Vs. Ondo: On-Chain Treasury Fund Comparison

BlackRock’s BUIDL is part of a growing field of tokenized funds. While all aim to connect traditional finance with blockchain tech, they differ in how they’re built, what they hold, and who they serve.

Moreover, BUIDL leads tokenized treasury products by a significant margin, with nearly triple the size of its closest competitor in the category

Below is a comparison of three widely known offerings — BlackRock’s BUIDL, Franklin Templeton’s OnChain U.S. Govt MMF, and Ondo Finance’s OUSG — highlighting how each fund bridges traditional finance with blockchain infrastructure.

Is BUIDL Safe?

BlackRock’s BUIDL fund is designed to bring the safeguards of traditional money market funds onto the blockchain, but like any investment, it carries both strengths and risks.

On the positive side, each BUIDL token is fully backed by U.S. Treasury bills, cash, and repurchase agreements, instruments widely considered low-risk. The fund is registered with the U.S. SEC, operates under U.S. securities law, and restricts access to accredited and qualified purchasers through Securitize’s compliance framework. 

Custody is provided by leading institutional partners such as Anchorage, BitGo, Coinbase, and Fireblocks, while transactions and balances remain transparent on public blockchains like Ethereum, Solana, and Polygon.

However, investors should also be aware of the limitations. Because BUIDL is a security token, transfers are restricted to whitelisted wallets that pass KYC/AML checks, which limits liquidity compared to open-market stablecoins. Returns depend on prevailing short-term U.S. Treasury yields, so a shift in interest rates will affect yield levels. 

While token redemption is backed by U.S. dollars, it may be subject to operational or timing constraints if large redemptions occur. On the technical side, the use of smart contracts, cross-chain bridges (Wormhole), and off-ramps like Ripple’s RLUSD introduces additional layers of infrastructure risk.

In short, BUIDL combines the regulatory structure of a traditional money market fund with blockchain transparency and programmability. It is not risk-free, but it represents one of the more compliant and institutionally focused approaches to tokenized real-world assets currently available.

Conclusion

BlackRock’s BUIDL is more than a show of confidence in tokenized finance, it demonstrates how blockchain can be used to deliver low-risk, yield-bearing instruments without discarding the regulatory oversight and structure of traditional markets. By tokenizing U.S. Treasuries and enabling daily, on-chain interest distribution, BUIDL has become a benchmark for how real-world assets can scale on blockchain rails.

The fund’s rapid growth to billions in value, its adoption as collateral in trading platforms, and the addition of RLUSD as an off-ramp highlight how tokenized money markets are moving from proof of concept to functioning infrastructure.

Yet, the bigger question remains: is BUIDL a step toward the decentralization ethos of crypto, or is it the rise of institutional DeFi, where traditional players adopt blockchain efficiencies but retain control over access, custody, and governance? The answer will shape whether tokenization evolves into a new open financial system or simply a more efficient extension of the old one.

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About the Author

Dr. Lorena Nessi

Dr. Lorena Nessi is an award-winning journalist and media technology expert with 15 years of experience in digital culture and communication. Based in Oxfordshire, UK, she combines academic insight with hands-on media practice.

She holds a PhD in Communication, Sociology, and Digital Cultures, and an MA in Globalization, Identity, and Technology.

Lorena has taught at Fairleigh Dickinson University, Nottingham Trent University, and the University of Oxford. She is a former producer for the BBC in London, with additional experience creating television content in Mexico and Japan.

Her research focuses on digital cultures, social media, technology, capitalism, and the societal impact of blockchain innovation.

She has written extensively on digital media and emerging technologies, with her work featured in both academic and media platforms. Her Web3 expertise explores how blockchain technologies shape culture, economics, and decentralized systems.

Outside of work, Lorena enjoys reading science fiction, playing strategic board games, traveling, and chasing adventures that get her heart racing. A perfect day ends with a relaxing spa and a good family meal.

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