What are tokenized money market funds?

BlackRock’s BUIDL looks like a stablecoin, pays interest like a bond fund, and is legally neither. Tokenized money market funds are the fastest-growing real-world asset in crypto, and almost nobody who talks about them can explain what you actually own.

For a decade, crypto’s answer to the question of where to park idle dollars was a stablecoin, and stablecoins had one glaring flaw as a savings instrument: they paid you nothing while the issuer collected the interest on the reserves. Tokenized money market funds are the industry’s response, and they have quietly become the most successful real-world asset category in existence. BlackRock, JPMorgan, Franklin Templeton, and Circle all now run one. The category went from essentially nothing to over $15 billion in about two years. And yet the basic question of what a holder actually owns, and what rights come with the token in the wallet, is answered wrong constantly, including by people trading them. This guide covers the structure, the mechanics, the major products, and the concentration problem sitting underneath the growth story.

What a tokenized money market fund is

A money market fund is one of the oldest and dullest products in finance. It pools money, invests it in very short-term, very low-risk instruments, and pays out the interest those instruments generate. Treasury bills with weeks to maturity, overnight repurchase agreements secured by Treasuries, and cash. The fund targets a stable value per share, conventionally one dollar, and the return comes from the underlying yield.

A tokenized money market fund is that same product with one change: the shares are represented as tokens on a blockchain, and the ownership record is maintained on-chain through a permissioned system rather than solely in traditional book-entry form. The fund still holds the same T-bills. The manager still runs the same mandate. The custodian bank still holds the underlying securities. What changes is the settlement rail.

That change is smaller than the marketing suggests and more consequential than the skepticism allows. It is not a reinvention of the product. It is a decades-old instrument moved onto infrastructure that settles in minutes instead of on a T+1 or T+2 cycle, operates continuously, and lets the share itself be programmable. Managers cut operational cost, holders gain around-the-clock mobility, and regulators get an auditable real-time record. Nobody involved is promising a revolution. They are removing settlement friction from cash management, which is a real if unglamorous prize.

Legally, these are securities. They are regulated and supervised by securities authorities, and the classification is what separates them from the thing they resemble.

Why they are not stablecoins

This is the distinction everything else depends on, and it is a legal one rather than a technical one.

A payment stablecoin such as USDC is designed as a settlement asset: a token that holds a dollar and moves. Under the GENIUS Act, US payment stablecoin issuers must hold full reserves in liquid assets, and they are prohibited from paying interest to holders. The issuer earns the yield on the reserves. You get the dollar.

A tokenized money market fund is designed as an investment: a token representing a share in a regulated fund that distributes returns in line with money market rates. Holders receive the yield. BlackRock’s OnChain Shares filing disclosed a 3.61% seven-day yield as of the end of 2025, which gives a concrete sense of the difference between holding a share and holding a stablecoin.

The odd part is that the two instruments are often backed by nearly identical assets. Both hold short-term Treasuries and cash. The economic substance is close to the same, and the legal classification is completely different, which determines who receives the interest and what rules apply. As one analyst framed it, these are essentially the same asset with different legal classifications and limitations.

The categories are also converging from both directions. The GENIUS Act permits eligible reserve assets, including money market funds, to be held in tokenized form, which means a tokenized fund can sit inside a stablecoin’s reserves. USDS, the third-largest stablecoin globally, reportedly holds BUIDL and JTRSY among its reserves, and Mountain Protocol’s stablecoin and frxUSD have done the same. JPMorgan launched JLTXX in May 2026 explicitly engineered as a GENIUS-compliant reserve asset for stablecoin issuers, seeded with $100 million alongside Anchorage Digital. The tokenized fund is becoming the thing that backs the stablecoin.

How one actually works

The operational flow has five steps and is considerably more controlled than a typical crypto transaction.

Step one: identity. The investor completes know-your-customer and sanctions screening with the transfer agent or an authorized platform. There is no anonymous participation.

Step two: allow-listing. The investor’s wallet address is added to an on-chain allow list maintained by the token contract. This is the critical departure from permissionless assets. An unapproved wallet cannot receive or hold the token, and a transfer to a non-approved address reverts at the contract level. The BIS has noted that these products rely on wallet allow-listing to constrain peer-to-peer trading and meet compliance requirements.

Step three: subscription. The investor sends cash, stablecoin, or another approved instrument. Payment methods vary: some funds accept only fiat wires, some accept USDC, some accept both. For BUIDL, investors wire dollars to the fund’s bank account at BNY Mellon.

Step four: issuance. The transfer agent confirms the subscription and the smart contract mints tokens to the whitelisted wallet, while the official ownership record is updated. The trade settles in minutes, bypassing the traditional clearing cycle.

Step five: yield. The interest earned by the underlying assets flows to holders through one of two designs. Accruing tokens hold price at $1.00 and pay rewards by minting additional tokens into holder wallets on a daily or monthly cadence, which is BUIDL’s model. Rebasing tokens grow the balance in each wallet automatically, so a wallet holding 1,000 tokens might hold 1,003.5 a month later.

Redemption reverses the path. Tokens go to the issuer’s contract, the contract burns them, and the administrator pays out dollars or, increasingly, a regulated stablecoin.

Four parties make this work, and it is worth naming them because the marketing tends to omit most. On the traditional side: a manager running the portfolio, a custodian bank holding the underlying securities, and a transfer agent keeping the official ownership record. On the tokenization side: a platform such as Securitize or Tokeny operating the smart contracts, and an oracle, typically Chainlink, publishing the fund’s net asset value on-chain so the token reflects its price.

What you actually own

Here is the part that gets stated backwards most often. The token in your wallet is not the ownership record.

The beneficial ownership of the fund shares remains recorded in the transfer agent’s official register. The token functions as a digital receipt that enables on-chain mobility. When a token moves between two authorized wallets, the system updates the off-chain ownership record to match. JPMorgan, among others, retains the authority to correct discrepancies between the on-chain ledger and the legal record, so that the technological holding never diverges from the legal reality.

Read that again, because it inverts the usual crypto assumption. In Bitcoin, the ledger is the truth. Here, the ledger is a mirror of the truth, and if the two disagree, the off-chain register wins and the chain gets corrected. Holding the token does not by itself prove ownership. Your rights flow from the fund documents, the transfer agent’s register, and the product’s redemption terms.

Access rules vary by product and are restrictive almost everywhere. BUIDL is a Securities Act Rule 506(c) private fund limited to qualified purchasers, with subscriptions starting around $5 million. USYC is available only to non-US persons. Some products carry institutional minimums far above any retail threshold. Acquiring exposure through a secondary market or an unapproved wallet may not carry the same rights as subscribing directly.

Legal structures differ too, in ways that matter. Some tokenized funds are digital representations of shares in a conventional US government money market fund, which allows broader participation but imposes strict liquidity constraints, including the requirement that 99.5% of assets sit in cash, government securities, or repo collateralized by them. Others are not money market funds at all in the regulatory sense, but private funds for accredited investors, exempt from many of the disclosure and liquidity risk management requirements that apply to registered funds. Treating BENJI, BUIDL, USYC, and WTGXX as interchangeable is a mistake, because their legal wrappers are not the same.

The major products

BUIDL is the BlackRock USD Institutional Digital Liquidity Fund, launched on Ethereum on March 20, 2024, with Securitize as transfer agent. It sits around $2.5 to $3 billion across at least eight networks, making it the largest single tokenized Treasury product. Each token targets $1.00, dividends accrue daily and pay monthly as newly minted BUIDL, and holders can custody at Anchorage, Coinbase Custody, Fireblocks, BitGo, Komainu, Copper, or their own multisig provided the wallet is whitelisted. Major derivatives platforms including OKX and Deribit accept it as collateral.

BENJI is the Franklin OnChain US Government Money Fund, the first tokenized money market fund, launched in 2021 on Stellar and since expanded to Polygon, Canton, Ethereum, Arbitrum, Base, Aptos, Avalanche, and Solana. One FOBXX share equals one BENJI token, with the transfer agent maintaining the official record through the Benji platform.

USYC was launched by Hashnote and later folded into Circle. It briefly overtook BUIDL on January 22, 2026 at roughly $2.98 billion, helped by deep integration as collateral on crypto-native venues.

OUSG and USDY, both from Ondo, show the structural creativity. OUSG is a fund-of-fund whose underlying allocation flows substantially through BUIDL, letting an issuer market a token under its own brand with its own fee and minimum structure. USDY is a reward-bearing note for non-US holders.

JLTXX and MONY are JPMorgan’s entries, with MONY launching on Ethereum in December 2025 and JLTXX following in May 2026 as a purpose-built stablecoin reserve asset.

WTGXX is WisdomTree’s Government Money Market Digital Fund, and USTB is Superstate’s short-duration Treasury product.

BlackRock also filed a registration statement in May 2026 for a fund whose OnChain Shares would have their official ownership record maintained through Securitize Transfer Agent using a permissioned system connected to multiple public blockchains. That filing was subject to completion, and the securities cannot be sold until it becomes effective.

What the tokens are used for

Demand does not come from savers. It comes from three institutional use cases.

Collateral. This is the largest driver. A tokenized fund share earns yield while sitting as margin, which a stablecoin cannot do. Crypto prime brokers allow clients including hedge funds to post BUIDL as collateral for derivatives trading, and DeFi protocols such as Aave’s Horizon accept tokenized funds as collateral against stablecoin borrowing. Capital that would otherwise sit idle in USDC now earns Treasury yield without leaving the trading system.

Stablecoin reserves. As covered above, tokenized funds are moving into the reserve baskets of stablecoins, a structural linkage that barely existed two years ago.

Fund-of-fund wrappers. OUSG is the model: build a product on top of another issuer’s fund, tailor the fees and minimums, market it under your own brand.

Notice what is absent from that list. Nobody is buying these to save for retirement. The BIS found that companies operating DeFi protocols are the main investors in BUIDL, and that fact explains the concentration data below.

How the yield actually reaches you

The yield mechanics deserve their own walkthrough, because they are where the tokenized wrapper does something a traditional fund share cannot, and where most confusion about these products lives.

Start with the source. The fund holds Treasury bills, overnight repo, and cash. Those instruments pay interest. That interest accrues to the fund and raises the value of the portfolio. In a conventional money market fund, the manager either lets the share price float slightly or, far more commonly, holds the share at a constant dollar and distributes the accrued income to holders on a schedule. Nothing about tokenization changes this part. The yield comes from short-term government debt, and it is whatever short-term government debt happens to pay.

Now the delivery, which is where the designs diverge. Accruing token models keep the token price pinned at $1.00 and pay rewards by minting additional tokens into holder wallets. BUIDL works this way: dividends accrue daily based on the fund’s net yield and are distributed monthly as freshly minted BUIDL. Your token count rises; each token stays worth a dollar. Rebasing models take the other route, growing the balance in each wallet automatically as rewards accrue, so a wallet holding 1,000 tokens at the start of a month might hold 1,003.5 by the end without any transaction appearing.

The distinction sounds cosmetic and is not, for two reasons. First, integrations break differently. A DeFi protocol that assumes a fixed balance will mishandle a rebasing token, and one that assumes a fixed supply will mishandle an accruing one. Second, the tax and accounting treatment of receiving new tokens is not obviously the same as the treatment of a balance silently increasing, and that difference belongs to the holder.

Then the part that has no traditional analogue at all: the share keeps earning while it works. This is the entire commercial case for the category, and it is worth stating precisely.

In the old arrangement, capital posted as margin sat idle. You wanted yield, so you held a money market fund; you wanted to trade, so you posted cash; you could not do both with the same dollar without a settlement cycle standing between them. A tokenized share collapses that. BlackRock structures BUIDL so exchanges including OKX and Deribit accept it as collateral for derivatives trades, and DeFi lending markets accept tokenized funds as collateral against stablecoin borrowing. The same dollar earns roughly the Treasury rate and backs a leveraged position at the same time.

That is not a marketing flourish. It is a genuine improvement in capital efficiency, and it explains the growth curve better than any narrative about democratized access.

Institutions did not adopt these products because they are on a blockchain. They adopted them because the blockchain let a yield-bearing security move at the speed of collateral, and collateral that earns is strictly better than collateral that does not.

It also explains the concentration. If the product’s killer feature is posting yield-bearing margin against derivatives positions, then the natural buyer is a trading desk or a protocol treasury, not a saver. The design selected its holders. Four wallets is not an accident of a young market; it is the predictable result of building an institutional collateral instrument and describing it as a savings revolution.

The concentration nobody advertises

The growth chart is genuinely impressive: under $1 billion in early 2024 to more than $15 billion by April 2026, with Boston Consulting Group and Standard Chartered projecting the broader tokenization market could reach $16 trillion by 2030. Set against a stablecoin market above $300 billion, tokenized funds are roughly 5% of the on-chain dollar economy, which is small but no longer trivial.

Now the part that appears in the BIS data and almost nowhere in the promotional material. For BUIDL, and also for WTGXX, around 90% of total holdings sit in the hands of only four wallet holders each, according to blockchain data. Demand from DeFi protocols has produced high concentration and limited trading activity.

That is a different product from the one being described in press releases. A category marketed as democratizing access to institutional cash management is, in practice, a handful of protocols and trading desks using an instrument that retail cannot legally touch. The allow-list model guarantees it: if wallets require qualified-purchaser status and $5 million minimums, the holder base will be institutional by construction.

The concentration has a practical consequence beyond optics. Four holders means redemption risk is lumpy. If one of four wallets holding a quarter of a fund decides to exit, the fund must liquidate a meaningful share of its portfolio at once. Money market funds are built for diversified redemption patterns, and a book with four holders does not have one. That risk has not been tested, partly because, as the ECB has observed, the tokenization market is still young enough that stress behavior has not yet been observed.

There is also a regulatory gap worth naming. In the EU, tokenized money market funds fall within the existing Money Market Fund Regulation, but whether they are permitted under MiCA is unclear, since the relevant implementing regulation has not been adopted. And the largest product by assets, BUIDL, is a private fund, which means it is exempt from many of the disclosure and liquidity risk management requirements that registered money market funds must meet. Regulators and the public have limited visibility into whether private tokenized funds have adopted the same liquidity tools, such as portfolio maturity maximums and liquid asset minimums, that registered funds are required to run.

The honest assessment

Tokenized money market funds are the clearest example in crypto of tokenization doing something real. They are not a narrative waiting for adoption. They hold actual Treasuries, pay actual yield, settle faster than the traditional rail, and have found genuine product-market fit as yield-bearing collateral. Compare that to most real-world asset projects, and the difference is stark.

The honest caveats are equally clear. This is not decentralized finance in any meaningful sense: access is permissioned, the ledger defers to an off-chain register, and an intermediary can correct your balance. The holder base is four wallets deep on the largest products. The retail access the category is marketed on does not exist for most of these funds. And the newest use case, sitting inside stablecoin reserves, quietly builds a linkage between the tokenized fund market and the $300 billion stablecoin market that regulators have not yet stress-tested.

The right way to hold both thoughts is this: tokenization worked here because it was applied to a product that did not need reinventing, only rewiring. That is the lesson, and it is a rebuke to every project trying to tokenize something that has no settlement problem to solve.

Disclaimer: This article is for information and educational purposes only and does not constitute financial or investment advice. Tokenized money market funds are securities subject to access restrictions, and eligibility, minimums, and terms vary by product and jurisdiction and can change at the manager’s discretion. Nothing here is a recommendation to buy any product. Always do your own research. Figures are accurate as of July 16, 2026.

Frequently Asked Questions