BlackRock BUIDL vs Ondo OUSG: Tokenized Treasury Face-Off 2026

You want on-chain yield backed by something boring. Short-term US Treasuries, no depeg drama, no token emissions that quietly dilute you. Two names dominate every discussion: BlackRock's BUIDL and Ondo's OUSG. The charts look nearly identical, so you'd be forgiven for treating them as interchangeable.

They aren't. One is a $10-trillion-asset-manager money market fund wrapped in tokens. The other is a smaller, crypto-native wrapper fund that invests partly into the first one. The difference matters for fees, access, liquidity and what you can do with the token after you buy it. Here is the full face-off, with numbers sourced to fund disclosures and the leading RWA trackers.

What exactly are BUIDL and OUSG — and why do people confuse them?

Both tokens represent claims on portfolios of short-duration US dollar debt. Both target a stable net asset value (NAV) around $1 per token. Both accrue the yield from that debt and distribute it in additional tokens. That's where the similarities peak.

BUIDL: BlackRock's tokenized money market fund

The full name is the BlackRock USD Institutional Digital Liquidity Fund. It launched on March 20, 2024 as a Delaware statutory trust relying on SEC Regulation D, built and administered on-chain by Securitize, with the underlying assets — cash, short-term US Treasury bills and repurchase agreements — held by BNY Mellon. Yield accrues daily and is dropped into investor wallets monthly as new BUIDL tokens. In 2026 Moody's assigned the fund its top AAA-mf rating, and cumulative dividends passed $100 million.

OUSG: Ondo's Treasury wrapper that quietly owns BUIDL

OUSG is the Ondo Short-Term US Government Treasuries Fund, an Ondo Finance product structured for qualified purchasers. Rather than running a bespoke money market desk, Ondo allocates OUSG capital into established short-Treasury vehicles — exchange-traded funds and tokenized products, which have included BlackRock's BUIDL. So an OUSG holder holds a claim on Ondo's fund, which in turn holds claims on other funds. OUSG lives on Ethereum; its rOUSG wrapper is what appears inside DeFi applications.

How did a rival fund end up inside the competition?

The overlap is a product of how the tokenized market matured. BUIDL launched first at institutional scale and rapidly became the deepest pool of tokenized Treasury yield on public chains. Other issuers faced a choice: build redundant custody and trading desks of their own, or allocate into the deepest available vehicle while adding their own structuring. Ondo chose a hybrid — OUSG holds a mix of directly managed exposure, Treasury ETFs and tokenized funds, with BUIDL appearing among its allocations. So when BlackRock's fund grows, part of that growth can come from products the market treats as its competitors.

The category's leadership has been less stable than the brand names suggest. Per CoinDesk and Bitcoin.com News, Circle's USYC briefly overtook BUIDL as the largest tokenized Treasury product in March 2026, before continued inflows — and a wave of integrations around Securitize, Ethena and Uniswap Labs — put BUIDL back ahead at roughly $2.8 billion by late August. At its peak dominance BUIDL represented 40–46% of the entire tokenized Treasury category; in late 2026 its share is closer to 18.5%, because the category itself roughly tripled. That is what a market growing up looks like: the leader keeps growing while its share compresses.

How do the two funds actually compare in 2026?

SIFMA's May 2026 research brief put BUIDL at roughly $2.58 billion; by late August 2026 coverage in Bitcoin.com News and CoinDesk reported about $2.8 billion after BUIDL reclaimed the number-one spot from Circle's USYC. OUSG was around $285 million in Allium's May 12, 2026 snapshot. Note that Ondo's flagship yield product is USDY at roughly $2.1 billion — people often compare BUIDL to OUSG when they mean USDY.

What are the fees, layer by layer?

Neither product publishes one simple all-in number in the way a bank advertises an account; costs are deducted inside NAV, so they're felt rather than invoiced. The chain of charges for each product:

• BUIDL: fund administration and management costs, Securitize's transfer-agent and servicing fee, and underlying custody and transaction costs on bills and repo — together reflected in the gap between gross bill yield and the yield token holders receive.
• OUSG: Ondo's management fee, plus fund administration and servicing, plus the fees charged by every underlying vehicle it allocates into — which, when the allocation includes BUIDL, means BlackRock and Securitize's costs are already embedded before Ondo's layer is added.
• Transaction costs outside the fund: gas for minting and redemption, and spreads or slippage if you buy or sell on secondary venues instead. These are paid per action, not annually.

The practical effect is small in a 4.5% rate world — a few hundred dollars a year on a seven-figure position — but fee drag compounds silently and becomes proportionally heavier whenever short rates fall. Two products advertising the same headline rate are rarely delivering the same net number.

Where does the yield come from — and who keeps a cut?

BUIDL earns the weighted yield on its bills and repo, deducts its costs, and passes the rest to token holders. Its reported yield ranged around 3.4–4.5% APY over 2026 as the Federal Reserve's policy rate moved; Securitize's dashboard quoted 4.75% during higher-rate periods. There is no mystery and no leverage: the number is essentially the short-T-bill rate minus fund expenses.

OUSG earns whatever its underlying funds distribute. Gross yield therefore tracks the same bill market. But every layer in the chain can charge — the underlying ETF or fund, Ondo's management fee and servicing costs — so OUSG's net yield to a token holder typically lands a few basis points below holding the underlying vehicles directly. If the underlying includes BUIDL, you are paying BlackRock, Securitize and Ondo in sequence. The gap is small in a high-rate world; it becomes more visible when short rates fall and fixed fees consume a bigger share of a shrinking pie.

What can you actually do with each token after buying?

This is where BUIDL's lead compounds. Securitize has built an authorization layer that lets whitelisted smart contracts hold the token, and exchanges and protocols have integrated it aggressively. BUIDL backs Ethena's USDtb and Frax's frxUSD as reserve collateral, serves as margin on derivatives venues, is accepted off-exchange by Binance, Deribit and Crypto.com, and feeds leveraged lending positions on Euler and Morpho. It can also be traded on UniswapX through authorized market makers. OUSG is more siloed: useful inside Ondo's own ecosystem and a smaller set of approved DeFi venues via rOUSG, but not a universal collateral primitive.

A worked example: what does a year of holding actually produce?

Say an eligible investor allocates $1,000,000 into each product at the start of a year, with BUIDL compounding net at 4.2% and OUSG compounding net at 4.0% after all layers — illustrative 2026 rates consistent with the funds' reported ranges, ignoring gas. Quarterly compounding, rounded:

The year-end gap is about $2,065 on a million — 0.2 percentage points, the cost of the extra wrapper layer at these rates. Neither number is guaranteed: both track prevailing bill yields, so if rates fall through the year, actual results compound lower. The point of the exercise is comparative, not predictive: with the same underlying paper, structural layers — not manager genius — determine which token ends ahead.

Who can actually buy these things?

Access, not yield, is the real differentiator for most people reading this. SIFMA's brief is explicit: BUIDL is restricted to US qualified purchasers with a $5 million minimum in USDC. A qualified purchaser generally means at least $5 million in investments — an institutional bar, not a mass-retail one. OUSG requires Ondo's KYC and qualified-purchaser or accredited-investor status, and it is geographically restricted; US persons and many other jurisdictions are excluded from direct subscription.

The legal vocabulary matters because the two gates sit at different heights. An accredited investor generally meets an income or net-worth threshold (roughly $200,000 of income or $1 million in net worth excluding a primary residence in the US). A qualified purchaser is a higher bar — generally $5 million in investments — and funds relying on Regulation D's 506(c) framework, like BUIDL, use it to stay outside some retail-investor rules. Accreditation gets you through some doors; qualified-purchaser status gets you through the larger ones. Neither is a judgment about your sophistication, and both are verified through documents rather than self-attestation.

So what can a regular investor do? Three honest paths: Ondo's USDY is designed for non-US users and trades on a dozen chains at similar short-rate yields; regulated platforms and custodians offer indirect exposure through feeder structures; and you can simply keep stablecoins in blue-chip lending markets — compare the risk trade in our tokenized treasuries vs DeFi lending showdown. You can also see how the yield-bearing-stablecoin world splits in Ethena vs Sky.

Five common mistakes buyers make with these tokens

• Treating AUM as safety. A $2.8B fund can still gate redemptions; size tells you about adoption, not about your exit rights.
• Comparing headline yields instead of net. After stacked fees, two "4.3%" products can be 20 basis points apart in your wallet.
• Buying above NAV on secondary markets. A premium is capital you can never recover through accrual; it evaporates on the first redemption.
• Assuming jurisdiction won't change. Transfer rights depend on the rules in force when you sell, not the rules when you bought.
• Holding the wrapper where the underlying is cheaper. If you're eligible for direct access, paying a middleman to hold what you could hold directly rarely makes sense.

Which one should you choose — BUIDL or OUSG?

If you are an institution with $5M-plus to deploy

BUIDL. The fund is bigger, rated, multichain, instantly redeemable for eligible holders and accepted as collateral across the widest network. OUSG only wins if your operation specifically needs Ondo's structuring or distribution and you accept the extra layer.

If you are a professional allocator building on Ethereum

Compare OUSG against USDY and direct BUIDL access on total cost after all fees, not headline APY. At equal yields, the product with fewer wrapper layers usually wins over a multi-year horizon.

If you are a retail or non-accredited investor

Neither directly — and that's by design. Your practical alternatives are USDY, yield-bearing products from the broader ecosystem, or permissionless lending markets ranked in our guide to the best lending protocols. More on Ondo's full product stack on the Ondo protocol review, and you can track BUIDL against Ondo's suite in the dedicated Ondo vs BUIDL comparison.

Frequently asked questions

What is the difference between BlackRock BUIDL and Ondo OUSG?

BUIDL is BlackRock's own tokenized money market fund holding cash, T-bills and repo, administered by Securitize. OUSG is Ondo's fund that allocates into short-Treasury ETFs and tokenized products, including BUIDL. OUSG is partly a wrapper around BUIDL with an extra structuring and fee layer.

Which fund is bigger in 2026?

BUIDL, by roughly ten to one: about $2.8 billion versus around $285 million for OUSG. BUIDL alone represents about 18.5% of the $15.1 billion tokenized Treasury market. Ondo's larger product is USDY at roughly $2.1 billion.

Can retail investors buy BUIDL and OUSG directly?

No. BUIDL requires qualified-purchaser status and a $5 million minimum; OUSG requires KYC and qualified or accredited investor status in eligible jurisdictions. Retail investors typically use USDY, wrapped products or regulated feeders for similar exposure.

Do BUIDL and OUSG pay different yields?

Only marginally. BUIDL reported roughly 3.4–4.5% APY in 2026 (up to 4.75% in higher-rate periods). OUSG's gross yield is similar because the paper overlaps, but layered fees make its net yield a few basis points lower on average.

Which blockchains support BUIDL and OUSG?

BUIDL runs across eight chains — Ethereum, Solana, BNB Chain, Polygon, Arbitrum, Optimism, Avalanche and Aptos. OUSG is issued on Ethereum with rOUSG wrappers for DeFi. Multichain reach is a major BUIDL advantage.

Sources and further reading

• BlackRock — BUIDL fund page — official NAV, yield, holdings and distribution data.
• SIFMA — Digital Assets Research Brief (May 2026) — BUIDL AUM, eligibility and minimum-investment detail.
• Allium Research — Ondo Finance valuation report — OUSG, USDY and tokenized-equity AUM breakdown.
• rwa.xyz — live tokenized Treasury and RWA market tracker.
• Crypto & Coin — RWA market passes $730B — 2026 market sizing and collateral-use analysis.

Keep reading in the DifiCalc blog: Tokenized Treasuries vs DeFi Lending, Best Stablecoin Yield 2026 and our Aave review.