Why hold tokenized treasuries through a stablecoin vault

A fintech that qualifies can buy tokenized treasuries such as BUIDL or OUSG in its own name, which is often the simpler route for its own cash. For customer balances, a stablecoin vault pays small withdrawals at any hour and keeps each customer's share on its own books.

Imagine a fintech with 20,000 customers holding $10 million of USDC between them, about $500 each, when one of them asks for $80 back at 11pm on a Sunday. If the fintech holds tokenized treasuries directly, BlackRock's BUIDL redeems only from 250,000 USDC, on business days. The $80 comes out of USDC the fintech keeps on hand, and the fintech's own ledger has to record it. Through a stablecoin vault, the customer holds vault shares instead, and the vault's USDC buffer pays the $80 straight away.

The fund and its rate stay the same on both routes. The vault adds a buffer that pays any size at any hour, per-depositor share accounting the fintech doesn't have to build, one issuer approval for the funds it holds, and the same integration for higher-yield vaults later. In return it charges a vault fee and adds smart contract and oracle risk. Holding the fund directly is the better choice for a company investing its own treasury in large tickets, as long as it meets the fund's eligibility rules and minimums.

Holding the fund directly vs through a stablecoin vault

Fund terms come from Circle's USYC page, Ondo's OUSG page and rwa.xyz's BUIDL page, all read on 6 October 2026. Each vault sets its own terms.

Small withdrawals need USDC on hand on both routes

Most withdrawals from a $10 million book of $500 balances are small. BUIDL's minimum redemption is 250,000 USDC, with standard redemptions processed daily. Circle redeems USYC for non-US holders in one block up to its instant capacity, and settles larger amounts T+0 or T+1. Ondo's OUSG mints and redeems 24/7 from $5,000, weekends and bank holidays included. None of these pays an $80 withdrawal by itself. A fintech holding the fund directly keeps its own USDC float for that and refills it in larger lots, through the USDC contract Circle launched for BUIDL holders in April 2024, USYC's instant route, OUSG or the fund's next daily redemption.

A stablecoin vault runs the same float as a buffer inside the vault. It holds most deposits in fund shares, keeps a slice in USDC and tops that slice up through the same routes, in large amounts. Either way the idle USDC earns little, and it trims the rate by the same amount.

Eligibility stays with the fund

A stablecoin vault leaves the fund's investor test in place. Under SEC Rule 2a51-3, a company formed to buy into a 3(c)(7) fund counts as a qualified purchaser only if each of its beneficial owners is one. A vault set up to hold a qualified-purchaser fund such as BUIDL or OUSG needs US depositors who qualify themselves, and one holding Superstate's USTB needs depositors who meet USTB's accredited-investor or qualified-purchaser test. That's our reading of the rule, as general information and not legal advice.

A customer vault for a small-balance book holds funds open to those customers. USYC takes non-US investors from 100,000 USDC, and Franklin Templeton's BENJI takes US investors from $20 (rwa.xyz, 6 October 2026). An Upshift vault can be open to anyone, limited to allow-listed wallets or reserved for one depositor, and the allow list keeps deposits to people the fund's terms admit. Counsel reviews the issuer's terms and the vault's permissioning together before launch. The tokenized treasuries guide lists who can hold each of the six largest funds.

The vault keeps the customer ledger

When the fintech holds the fund directly, it owns one position and owes 20,000 customers a share of it. It works out each customer's daily income, posts it, handles deposits and withdrawals in between, and reconciles the total against the fund's statement. Funds pay income in different ways, too: BUIDL distributes dividends onchain as new tokens, while USYC's yield shows up as a rising token price. Customers hold a claim on the fintech, and that arrangement usually needs legal review in each market the fintech serves.

In a vault, each deposit mints vault shares at the current share price, and the fund's income lifts that price every day. A customer's balance is shares times price. Upshift's pricing engine marks the fund shares for the vault's net asset value (NAV), and the curator, typically a hedge fund or asset manager, doesn't set its own mark. Tokenized money market funds vs stablecoin vaults compares the two products on rates, fees and exit times.

One issuer approval covers the vault's funds

Each tokenized fund keeps its own list of approved wallets. A fintech holding BUIDL, USYC and OUSG directly goes through KYC with Securitize, Circle and Ondo in turn, then gets its wallets added to each list. With a vault, the issuer approves the vault contract as a holder once, for the funds that vault holds.

Depositors still meet each fund's investor test through the vault's allow list.

The numbers on a $10 million customer book

Take the same book: $10 million across 20,000 customers, 10% held in USDC for withdrawals, and the rest in tokenized treasury funds at their 7-day average yield of 3.62% (rwa.xyz's Treasury dashboard, 6 October 2026). The vault fee is illustrative, since each vault sets its own.

The vault costs about 0.25 percentage points on this book, or $25,000 a year before any performance fee. For that the fintech skips the ledger build, the per-fund onboarding and the refill operations. A fintech keeping a 0.50% share leaves customers about 2.5% through the vault, at 6 October 2026 rates, which move with US short-term rates. The T-bill calculator reruns the sum at other rates, and tiered stablecoin yield covers paying different rates by balance or plan.

Core and Enhanced vaults use the same integration

A fintech holding funds directly adds a lending or credit strategy as a new counterparty and a new build. On Upshift, a partner adds a Core vault (indicative 5-7%) or an Enhanced vault (8%+) with the same SDK calls and a different vault address, per the Upshift yield options page, with no return guaranteed. Each band is its own vault with its own disclosures. How to tier vault strategies by risk covers which strategies sit in which band.

Holding the fund directly is the better choice for a company's own treasury

A company putting its own cash into one fund, in large tickets, gets little from the vault layer. Subject to each fund's investor test, it can hold BUIDL from 5,000,000 USDC, USYC from 100,000 USDC or OUSG from $5,000 on its own balance sheet, and its withdrawals come in amounts the fund redeems anyway. It keeps one position and one set of books and pays no vault fee. How companies earn yield on treasury cash covers the treasury policy side.

Some companies still want several funds and a USDC buffer in one position, and Upshift's treasury setup covers that case (we see it most with companies settling payments daily). The vault earns its fee most clearly on customer balances, where thousands of people hold small amounts and withdraw at random hours.

How Upshift runs tokenized treasuries in a stablecoin vault

Upshift is onchain yield infrastructure for fintechs and asset managers with stablecoin balances. Its Conservative band holds tokenized Treasury and money market funds at an indicative 3-4% before fees, and a cash-management version keeps a buffer sized to daily settlement. Partners launch the vault under their own name through the Upshift SDK (npm package @augustdigital/sdk), the API or the Upshift app, and they set the fee and who can deposit. Every Upshift vault processes redemptions daily, with its own lag, and most offer instant redemption for a fee, subject to liquidity.

For a larger exit, Upshift Clear pays USDC for tokenized fund shares from a pool funded by liquidity providers and redeems with the issuer afterwards. Each vault's owner is a Gnosis Safe multisig, and the contracts have had 11 smart contract audits by 6 independent firms. Upshift has reached $550M+ in peak deposits across 50+ vaults on 30+ chains, for 66,000+ users.

Risks on each route

• Holding directly: issuer terms that can change, business-day redemption windows, high minimums and allowlisted wallets only.
• Instant routes, including Circle's BUIDL contract, USYC's instant capacity, OUSG and Upshift Clear, pay only up to the USDC they hold, and they rely on contract code and price feeds.
• Through a vault: smart contract and oracle risk on top of the fund's own. A large outflow can outrun the buffer and wait for the daily queue.
• Rate cuts by the Federal Reserve.

Vault yields vary and aren't guaranteed, and none of these products carries deposit insurance. Vault provider due diligence lists the questions to put to any provider.

Always make sure to do your own research and be aware of the above and any other risks before depositing.

Frequently asked questions

Why hold a tokenized fund through a stablecoin vault and not directly?

To serve customer balances. The vault meets the fund's entry minimum once, and a customer can then put $50 into a position in a fund like USYC that takes 100,000 USDC to enter. The fund's investor test still applies to every depositor.

BUIDL vs USYC vs BENJI: which tokenized money market fund should a fintech use?

For non-US customers, USYC (non-US investors from 100,000 USDC, 3.39% 7-day APY). For US retail, BENJI (from $20, 3.72%). BUIDL takes US qualified purchasers from 5,000,000 USDC and paid 3.68%. All figures are from rwa.xyz on 6 October 2026. BUIDL vs USYC vs BENJI sets out fees, chains and weekend terms fund by fund.

Do tokenized money market funds redeem on weekends?

Standard redemptions follow business days, and several funds add a 24/7 USDC route. On 24 February 2026 the SEC approved round-the-clock dealer trading of WisdomTree's WTGXX at $1, settled in USDC, CoinDesk reported. Stablecoin redemption times compares payout speed across 10 yield options.

How can a fintech offer a 24/7 T-bill rate on customer stablecoin balances?

It deposits customer USDC into a stablecoin vault that holds tokenized treasury funds and a USDC buffer, and shows the vault's rate in its Earn tab. Tria went live on Upshift vaults two weeks after starting its SDK integration, according to the Tria case study. How fintechs pay a 24/7 T-bill rate covers the full build and the GENIUS Act limits on issuers.

Does a stablecoin vault change who can invest in BUIDL or OUSG?

The investor test stays with the fund. Ondo sells OUSG to qualified purchasers in the countries it lists, including the US, and a vault holding OUSG needs depositors who pass that test. This is general information, not legal advice.

What does a stablecoin vault cost compared with holding the fund?

The fund's own fee applies on both routes. BUIDL charges 0.20% to 0.50% a year depending on the chain, per BlackRock's November 2024 share-class release, USYC takes 10% of the yield, and OUSG's management fee is capped at 0.15% and waived until 1 January 2027. The vault adds its own management and performance fees, and on most Upshift vaults a management fee change goes through a timelock first.