Tokenized money market funds vs stablecoin vaults

Tokenized money market funds pay the T-bill rate, but only to holders the issuer has approved. BlackRock's BUIDL, for one, takes US qualified purchasers investing at least $5,000,000. A stablecoin vault can hold the same kind of fund on your behalf, with a USDC buffer next to it that pays withdrawals at weekends, when standard fund redemptions are closed.

On 18 July 2025 the GENIUS Act became law, and it bars a permitted payment stablecoin issuer from paying holders interest or yield. The issuer keeps the income on its reserves. Anyone holding USDC who wants the T-bill rate has to move the dollars somewhere that pays it. The most direct route is a tokenized money market fund, a regulated fund whose shares are issued as tokens on a public blockchain. Tokenized US Treasury funds held $14.69B across 108 products on 1 October 2026, according to rwa.xyz's Treasury fund dashboard.

The other two routes are a stablecoin vault, or doing nothing and keeping plain stablecoins.

Fintechs, payment companies and corporate treasuries all end up facing this. They hold USDC and USDT for settlement, card spend and payouts, and the balance waiting between those flows earns nothing until someone moves it.

A tokenized fund holds the same assets as a conventional one

The portfolio is the same as a conventional government money market fund's, which the SEC's investor bulletin describes as investing 99.5% or more of its assets in cash, government securities and fully collateralized repurchase agreements. What changes is the record. The fund's transfer agent treats the token as the legal record of ownership, and holders keep the shares in an approved wallet. They can move them between approved wallets on weekends, or post them as collateral at venues that accept them. BlackRock lists stablecoin reserves, treasury management and collateral as the main uses. State Street describes the change as the same fund exposure on new rails. Sizes, chains and exit routes for the largest funds are in our guide to tokenized treasuries.

A stablecoin vault pools USDC under a written mandate

The vault is a smart contract. It pools USDC or USDT, deploys it into one or more yield sources, and gives depositors a receipt token they redeem at net asset value. A professional curator picks the positions, and the contract limits where the money can go. On Upshift, the policy engine restricts deployment by chain, protocol, token and contract function, and any transaction outside the mandate reverts. Upshift's multi-oracle engine prices every position (the curator has no say in its own mark).

Mandates vary a lot. A conservative vault holds tokenized Treasury funds and a cash buffer. A mid-risk vault lends to blue-chip lending markets or institutional borrowers, and a higher-yield vault runs market-neutral carry. Upshift groups these into three indicative bands on its stablecoin yield options page, all before vault fees and none guaranteed: 3-4% for the 24/7 T-bill band, 5-7% for diversified lending and tokenized credit, and 8% or more for market-neutral strategies. A vault can be open to anyone or permissioned to an allow list, including a single depositor.

At the conservative end the rates converge and the access differs

A tokenized money market fund and a T-bill vault both earn from the same short-dated government paper. The vault adds a USDC buffer, room for other strategies and a smart contract to diligence.

Minimums are from rwa.xyz asset pages on 23 September 2026, as cited in the tokenized treasuries comparison. Issuers set and change their own terms. Confirm them with the fund before committing.

Eligibility rules out more buyers than yield does

On 23 September 2026, BlackRock's BUIDL was open to US qualified purchasers with a $5,000,000 minimum. Circle's USYC took non-US entities from 100,000 USDC, and WisdomTree's WTGXX took US investors from $1 (source: rwa.xyz asset pages). Most of these funds only transfer between wallets the issuer or its transfer agent has approved, and a transfer to any other address fails at the contract level. Franklin Templeton's own explainer describes tokenized funds as available only to vetted participants who have passed KYC and AML checks.

A large treasury with its own legal entity, a qualified custodian and the right investor status can onboard with an issuer and hold the shares on its balance sheet. A fintech passing the yield through to customers has a harder time of it. Either each customer qualifies, or the fintech buys the shares in its own name and credits customers interest from the fund's income. In that setup customers hold a claim on the fintech, not on the fund, and paying interest on customer balances usually needs legal review. A vault sits between those cases. The vault gets onboarded with the issuer once, and depositors hold a receipt token for their share of the vault's assets, under the vault's own permissioning.

Fund redemptions follow business days, and a buffer covers the gap

Plain stablecoins are spendable at once. A tokenized money market fund can burn its token in one block. The fund still has to sell assets and settle through banking rails, and standard redemptions follow business days and cut-off times. Circle's USYC runs standard redemptions on up to one business day. BlackRock's BUIDL redeems daily, in amounts of at least $250,000 (source: rwa.xyz asset pages, 23 September 2026). Some issuers add instant facilities, such as Circle's USDC smart contract for BUIDL holders, which pay out 24/7 up to the facility's balance.

A vault that keeps part of its assets in USDC can pay withdrawals from that buffer on weekends and holidays, then refill it from fund redemptions on the next business day. Upshift processes all claimable redemptions daily. Each vault has its own withdrawal lag, and most offer instant redemption for a fee, subject to available liquidity. Holders of supported tokenized assets can also use Upshift Clear for instant USDC redemptions, a liquidity pool that pays USDC in one transaction at an oracle price and waits for the issuer's settlement in the background.

Both earn the short rate, minus different fees

A tokenized money market fund earns the short-term Treasury rate on its portfolio and passes it to holders after the fund's management fee. The 7-day average yield across tokenized Treasury funds was 3.50% on 23 September 2026, according to rwa.xyz, and it moves with US short rates. The T-bill calculator shows what a balance earns at a given rate over a given holding period.

A vault's yield is the return of its positions minus its fees. A T-bill vault earns roughly the fund rate, less the vault's own fee and the drag from a cash buffer that earns little. A lending or credit vault earns borrower interest, which floats with demand for stablecoin loans. Upshift vaults charge management and performance fees set per vault, and on most vaults a change to the management fee goes through a timelock before it takes effect. At the conservative end you give up a little headline rate. In return you get faster exits and one integration.

Each option carries a different set of risks

• Plain stablecoins: issuer and reserve risk, depeg risk in stress, and the cost of earning nothing while rates are positive. How stablecoin depegs happen covers past cases.
• Tokenized money market funds: fund and issuer terms that can change, redemption windows that close on weekends and holidays, high minimums, thin secondary markets, and smart contract risk on the token and any instant facility.
• Stablecoin vaults: smart contract, strategy, oracle and liquidity risk.
• A vault that holds a tokenized fund carries the fund's risks on top of its own.

Upshift's vault contracts have had 11 smart contract audits by 6 independent firms, listed on the audits page. Upshift vaults carry no protocol-level smart contract insurance; cover can be bought from third-party providers. The full set of questions to put to any provider is in vault provider due diligence.

Do your own research on these and any other risks before depositing.

A vault can hold the fund as its reserve sleeve

It needs the fund issuer to approve the vault contract to hold its token first. After that, the vault holds the fund as its reserve sleeve and keeps a USDC buffer for withdrawals. If the mandate allows, it can add a lending sleeve. Fund redemptions refill the buffer before it runs low. The platform integrates one vault, with one receipt token, one NAV and one set of limits, and the fund supplies the T-bill income underneath.

This is how the most conservative band on Upshift's yield menu works. Idle USDC or USDT goes into tokenized Treasury and money market funds and earns the T-bill rate around the clock, and a cash-management version keeps a buffer sized to daily settlement. A treasury that wants the setup to itself can run it as a whitelisted vault with one depositor, as described on the onchain yield for treasuries page. Segregated vs co-mingled vault accounts covers that choice.

Most companies end up using more than one

The choice follows the balance. A written stablecoin treasury policy sorts balances into tiers by when they're needed, and each tier points somewhere different.

• Money needed in the next few days: plain stablecoins in a custody account or MPC wallet.
• A large institution's own reserve, held for weeks or months: a tokenized money market fund held directly, if the institution qualifies, meets the minimum and can live with business-day redemptions.
• A fintech passing yield to customers: a stablecoin vault holding a tokenized fund and a buffer, run under the fintech's brand. Customers hold the vault's receipt token, and the fintech integrates once.
• A payments company's float: a T-bill vault with a buffer sized to daily settlement. How card programs earn yield on customer float covers the card version.
• Cash not needed for months, with a hurdle above T-bills: a whitelisted curated vault running lending or credit.

Asset managers see the same decision from the issuing side. A manager with a tokenized fund can reach fintech and treasury buyers by having vaults hold it, with each vault onboarded once on behalf of its depositors. Still, some banks now offer a fourth option in tokenized deposits, and tokenized deposits vs stablecoins sets out how those differ.

Frequently asked questions

What is a tokenized money market fund?

A regulated money market fund whose shares are issued as tokens on a public blockchain. Tokenized US Treasury funds held $14.69B across 108 products on 1 October 2026, according to rwa.xyz.

Are tokenized money market funds the same as stablecoins?

They differ in who keeps the interest. A tokenized money market fund passes Treasury income to its holders, while the GENIUS Act bars a payment stablecoin issuer from paying holders interest or yield.

What is the minimum investment in a tokenized money market fund?

Anywhere from $1 to $5,000,000 among the largest funds on 23 September 2026, per rwa.xyz. Many also limit who can hold shares, such as qualified purchasers or non-US entities.

How long does it take to redeem a tokenized money market fund?

Circle's USYC runs standard redemptions on up to one business day, and BlackRock's BUIDL redeems daily, in amounts of at least $250,000 (rwa.xyz, 23 September 2026). Instant facilities pay USDC in one transaction, up to their available balance.

Can a vault hold a tokenized treasury fund?

Yes, if the fund issuer approves the vault contract. Upshift's most conservative band, at an indicative 3-4% before fees, is built this way.

Is a stablecoin vault riskier than a tokenized money market fund?

A vault holding only a tokenized fund and a buffer adds smart contract and oracle risk to the fund's own. A lending or carry vault adds strategy risk too, for a higher target return.

Keep reading

• Tokenized treasuries compared. The largest funds by size, eligibility and exit speed.
• How RWA-backed stablecoins generate yield. Where Treasury income backs a stablecoin.
• Whitelisted vault providers. Permissioned vaults with an allow list of depositors.
• Onchain yield in qualified custody. Earning while the receipt token stays with a custodian.