USYC: The Tokenized Treasury Fund Built for Collateral
USYC turns a short-term Treasury yield product into an onchain token that can settle and move as collateral in seconds. Here is how it works and why the collateral use case matters more than the yield.
The most interesting thing about USYC is not its yield. USYC was designed to move like cash while paying like a money market fund. USYC (the Hashnote International Short Duration Yield Fund token) is a tokenized short-duration Treasury and reverse-repo fund that settles onchain in seconds, which lets institutions post it as collateral, redeem it into stablecoins, and rebalance without waiting for a fund administrator to process a redemption.
That collateral function is why USYC sits inside one of the fastest-growing segments in crypto. According to Allium's crosschain RWA dataset (as of September 2026), tokenized Treasuries and money market funds account for $17.3B of the $33.4B in real-world assets tokenized onchain, the single largest RWA category. USYC is one of the products competing inside that $17.3B pool.
Key takeaways
- USYC is the onchain token for the Hashnote International Short Duration Yield Fund, a fund holding short-term US Treasuries and reverse repurchase agreements.
- USYC was acquired by Circle in early 2025, positioning it as a yield-bearing collateral layer alongside Circle's USDC stablecoin.
- The token's design goal is atomic settlement: converting between USYC and cash-equivalent stablecoins in a single onchain transaction rather than a multi-day fund redemption.
- Tokenized Treasuries and money market funds are the largest RWA category onchain at $17.3B, per Allium's dataset, growing alongside a total tokenized RWA market that rose roughly 175% over the trailing year to $33.4B.
- USYC is a security offered to eligible qualified investors, not a retail stablecoin, and access is gated by KYC and jurisdiction.
Why a fund token that settles in seconds changes the collateral math
Traditional money market funds are useful but slow. Redeeming one to raise cash typically clears on a T+1 basis, meaning capital is locked for a business day. For a trading desk or a lending protocol that needs to meet a margin call or fund a position now, that delay is the difference between a usable asset and a stranded one.
USYC targets exactly that gap. Because the fund's ownership is represented by an onchain token, a holder can move it, pledge it, or convert it inside the same rails that stablecoins already run on. Circle's stated rationale for the acquisition, described in its announcement, was to pair a yield-bearing instrument (USYC) with a cash-equivalent settlement token (USDC) so institutions can hold reserves that earn a return and still convert to spendable dollars quickly.
The broader shift is visible in the numbers. The tokenized Treasury and money market category did not grow to $17.3B because retail investors wanted onchain T-bills. It grew because treasuries, exchanges, and DeFi protocols want an interest-bearing asset that behaves like collateral. That is the demand USYC is built to serve.
How USYC works, step by step
- The fund holds the assets. The Hashnote International Short Duration Yield Fund invests in short-dated US Treasuries and overnight reverse repo. Details of the fund and its structure are published by Hashnote.
- Eligible investors subscribe. A qualified investor passes KYC and jurisdiction checks, then subscribes to the fund. Their ownership is issued as USYC tokens on a supported blockchain.
- Yield accrues to the token. USYC is structured so the fund's earnings are reflected in the token, giving holders exposure to the underlying short-duration yield.
- The token moves onchain. Because ownership is a token, it can be transferred between permitted wallets, held as protocol collateral, or used inside institutional workflows without leaving the chain.
- Redemption and conversion. Holders redeem USYC back to the fund or, under Circle's integration, convert between USYC and USDC. The design intent is near-instant settlement rather than a multi-day administrative redemption.
USYC versus a stablecoin and a traditional money fund
USYC is easy to confuse with a stablecoin because both are dollar-denominated onchain tokens. They answer different questions. A worked comparison makes the distinction concrete.
| Attribute | USYC (tokenized MMF) | Fiat stablecoin (e.g. USDC) | Traditional money market fund |
|---|---|---|---|
| Legal form | Security / fund interest | Payment token, reserve-backed | Registered fund share |
| Pays yield to holder | Yes | No (reserve income kept by issuer) | Yes |
| Who can hold it | Eligible qualified investors (KYC gated) | Broadly permissionless | Account holders at the fund/broker |
| Settlement speed | Onchain, near-instant target | Onchain, near-instant | Typically T+1 |
| Primary job | Yield-bearing collateral | Payments and settlement cash | Cash management |
What the collateral upgrade looks like in practice
The benefits of USYC are specific, and they show up as before-and-after changes in how capital behaves.
- Idle cash starts earning: collateral that used to sit as a non-yielding stablecoin can be held as USYC, so reserves posted against a position accrue short-duration Treasury yield instead of zero.
- Faster rebalancing: capital is not locked for a business day waiting for a fund redemption to clear, because conversion happens in an onchain transaction.
- One set of rails: a treasury team can hold yield-bearing and cash-equivalent assets in the same wallet infrastructure, instead of bridging between a brokerage account and an onchain balance.
- Programmable settlement: because USYC and its conversion live in smart contracts, margin, collateral swaps, and redemptions can be automated rather than instructed by email to an administrator.
The data problem behind comparing USYC to its peers
USYC is one token in a crowded field of tokenized Treasury and money market products, and each issuer models its onchain data differently. One product distributes yield by rebasing balances, another by accruing to a share price, another by minting reward tokens. USYC transfers, subscriptions, and redemptions land as raw contract events on multiple chains, and none of them arrive pre-labeled as "subscription," "collateral pledge," or "redemption to USDC."
To answer a question as basic as "how much value is held in tokenized money market funds this week, and how is it split across issuers and chains," every one of those events has to resolve to the same fields: asset, issuer, holder, amount, USD value, and transaction type, then be reconciled across networks that record the same economic action in incompatible ways. Allium normalizes those records across 150+ blockchains into standardized RWA tables, which is how a figure like $17.3B in tokenized Treasuries and money market funds gets assembled from thousands of raw events. That same standardization underpins where Allium data appears publicly, including a16z's State of Crypto report and research cited by the Federal Reserve. The RWA datasets expose these tables directly.
Risks and open questions
- It is a security, not cash. USYC carries the legal and market risk of a fund interest. Its value depends on the underlying Treasury and repo portfolio, and access is restricted to eligible investors. Treating it as interchangeable with a payment stablecoin misunderstands what it is.
- Redemption speed depends on conditions. "Near-instant" conversion relies on available liquidity and the operator's redemption mechanics. Stress in short-term funding markets can affect any money market product, tokenized or not.
- Concentration under one operator. With USYC now under Circle, its trajectory is tied to a single issuer's strategy and regulatory standing. That is a strength for integration and a concentration to weigh.
- Regulatory boundaries are still moving. The line between a yield-bearing tokenized fund and a payment instrument is exactly where securities regulators are focused. Rules governing who can hold and trade USYC can change by jurisdiction.
- Onchain does not remove counterparty risk. The token is only as sound as the fund custody, the reverse repo counterparties, and the smart contracts behind it.
Where USYC fits in the tokenized Treasury story
The tokenized Treasury and money market segment is the anchor of the RWA market at $17.3B, larger than tokenized commodities ($4.6B), private credit ($4.4B), private funds ($3.9B), or equities ($3.2B). USYC's bet is that the winning products in this segment will be the ones that behave less like a fund share and more like collateral that happens to pay interest. Whether it holds that position depends less on its yield and more on how deeply it gets wired into stablecoin settlement, exchange collateral, and DeFi lending.
Frequently asked questions
What does USYC stand for?
USYC is the ticker for the tokenized share of the Hashnote International Short Duration Yield Fund, a fund that invests in short-term US Treasuries and reverse repurchase agreements. The token represents an onchain claim on that fund.
Is USYC a stablecoin?
No. USYC is a tokenized money market fund, a security that pays yield to its holder. A fiat stablecoin like USDC is a payment token that does not pass reserve income to holders. USYC is aimed at yield-bearing collateral, not everyday payments, and access is restricted to eligible qualified investors.
Who owns USYC?
USYC originated with Hashnote and was acquired by Circle in early 2025. Under Circle, USYC is positioned as a yield-bearing complement to the USDC stablecoin, with the goal of enabling fast conversion between the two.
How does USYC generate yield?
The underlying fund holds short-duration US Treasuries and overnight reverse repo, and the income from those assets is reflected in the USYC token. Holders gain exposure to short-term Treasury yields through their token balance.
Can anyone buy USYC?
No. USYC is offered to eligible qualified investors and is gated by KYC and jurisdiction checks. It is not a permissionless retail token, which distinguishes it from broadly available stablecoins.
How big is the tokenized Treasury market USYC competes in?
According to Allium's crosschain RWA dataset as of September 2026, tokenized Treasuries and money market funds total $17.3B, the largest category within the $33.4B of real-world assets tokenized onchain. The overall RWA market grew roughly 175% over the trailing year.
