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They are not interchangeable forms of cash. An eligible bank deposit may qualify for FDIC insurance; a money market mutual fund (MMF) is an investment whose shares are not FDIC-insured; and a stablecoin is a digital asset whose market value and redemption depend on its issuer, reserves, terms, and transfer infrastructure. Compare the exact product’s protection, net return, access rules, and operational dependencies before deciding where to hold money.
Start with what you own—and who owes you
The word “cash” can obscure three different legal and practical arrangements. The key first question is not which one advertises the highest return, but what claim you hold and what has to happen for you to get your money back.
Bank deposit: a claim on a bank
A checking or savings balance is a liability of the bank holding the deposit. Deposits at FDIC-insured banks may qualify for FDIC insurance, subject to legal limits, depositor identity, ownership category, and institution. Coverage is not automatic merely because an account appears in an app: identify the bank that holds the funds and check how the account is titled. For a product offered through a nonbank, do not assume pass-through insurance applies unless the product’s structure and records meet the relevant requirements.
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Money market mutual fund: a share in an investment fund
An MMF pools investors’ money to buy short-term instruments, which can include government securities, certificates of deposit, or commercial paper. You own fund shares, not a bank deposit. The New York Fed explicitly distinguishes money market mutual funds from bank money market deposit accounts and notes that MMFs are not insured: New York Fed: Money Market Funds.
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Do not confuse an MMF with a bank money market deposit account. The latter is a deposit account; an MMF is a mutual fund. Their names sound similar, but their legal structures and protections differ.
Stablecoin: a digital asset designed to track a reference value
A stablecoin is a digital asset designed to maintain a stable value against a currency or another reference asset. Its target price is not itself a guarantee of market price or instant redemption. The token holder’s rights, reserve backing, redemption route, fees, timing, and eligibility depend on the particular issuer and its terms. Buying or holding tokens through an exchange or custodian adds those intermediaries, while transfers also depend on the relevant blockchain working as intended.
Compare the three options side by side
| Question | Bank deposit | Money market mutual fund | Stablecoin |
|---|---|---|---|
| What do you hold? | A deposit claim against the bank. | Shares in a mutual fund. | A digital token; rights against an issuer, if any, depend on its terms. |
| Is it FDIC-insured? | Eligible deposits at insured banks may qualify, subject to legal limits, ownership category, depositor, and institution. | No. An MMF share is not a bank deposit. New York Fed | No. Stablecoins are not backed by deposit insurance. Federal Reserve Governor Michael S. Barr, October 16, 2025 |
| What supports the value? | The bank’s promise to repay; deposit insurance may protect eligible balances within applicable limits. | The fund’s portfolio of short-term instruments; the specific holdings and risks depend on the fund. | Issuer reserves and redemption arrangements, plus market demand and the functioning of the relevant service providers and network. |
| What could affect access or value? | Account terms, bank operations, and any applicable withdrawal conditions. | Fund liquidity rules, brokerage access, settlement, fees, and portfolio conditions. | Redemption terms and eligibility, exchange or custodian operations, blockchain congestion or outage, and market trading conditions. |
| What should you check for return? | Current account APY, fees, minimums, and any rate conditions. | Current yield for the exact share class, net of fees, plus minimums and access costs. | Whether any reward is issuer-paid or instead comes from a platform or another activity; check fees, restrictions, and terms. |
What “safe” means depends on the risk you want to avoid
There is no single safety ranking that fits every purpose. A deposit’s potential insurance protection is different from a fund’s portfolio quality, and both differ from a token’s reserve and redemption setup. Separate at least four questions: can the value fall, can redemption be delayed, could an intermediary fail or restrict access, and could the technology or transfer route stop working?
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For a bank account, confirm that the institution is FDIC-insured, which legal entity holds the balance, and how the account is owned. If a nonbank service says funds are held at a partner bank, read its explanation of the deposit arrangement rather than treating the brand or app as the insured bank. Insurance is subject to limits and conditions; it does not mean every balance held through every product is protected.
MMFs: short-term holdings do not make shares insured or risk-free
Short maturities and lower-risk instruments do not turn a fund share into a guaranteed bank balance. Review the fund’s portfolio, share class, fees, liquidity rules, and how you access it through the brokerage. The fund’s structure and terms matter, not just the phrase “money market.”
Stablecoins: reserve quality and redemption matter more than the peg label
Federal Reserve Governor Michael S. Barr warned on October 16, 2025: “Because stablecoins are not backed by deposit insurance and stablecoin issuers do not have access to central bank liquidity, the quality and liquidity of their reserve assets is critical to their long-run viability.” Read the full Federal Reserve speech on stablecoins.
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A reserve description alone does not tell you whether you personally can redeem tokens, at what price, how quickly, or through which route. Check who is eligible to redeem directly, whether you must use an exchange or other intermediary, and what fees, timing, or limits apply. A token can trade away from its target value even if it is designed to track a dollar.
Stress can change the experience of holding a stablecoin
A New York Fed staff study, revised in April 2024, found that flows shifted from riskier to safer stablecoins on crypto-stress days. The researchers also estimated a discrete “break-the-buck” threshold at $1, below which redemptions accelerated in the study they analyzed. These are study findings, not a universal prediction for every stablecoin or market condition. Read Runs and Flights to Safety: Are Stablecoins the New Money Market Funds?.
The practical implication is to assess both the token and the path out of it. In a stressed market, a quoted token price, an issuer’s redemption process, and the ability to move or sell tokens can be distinct things. Do not treat “pegged to $1” as a promise that every holder can instantly exchange one token for one dollar.
Compare returns using the same date and the full cost
Rates and yields change, and a headline reward may not be comparable with an account APY or a fund’s yield. For each specific product, record the rate measure and date, subtract recurring fees, and check minimum balances, promotional conditions, and access restrictions. For a stablecoin reward, establish who pays it and why; do not assume it is interest paid by the issuer.
The Federal Reserve’s November 2025 Financial Stability Report said total MMF assets reached $7.1 trillion in July 2025, up from $6.3 trillion in July 2024, likely because MMFs continued to offer more attractive yields than most bank deposits. The same report said stablecoin assets had grown by more than 70 percent over the preceding 12 months as of its observation. Those are historical category-level figures, not today’s rate quotes and not evidence that a particular account, fund, or token offers the best return or is safest.
Check access, fees, and operational dependencies
“Liquid” does not always mean immediately spendable. Compare the full route from holding to usable funds, including business-hour constraints, settlement, transfer limits, and dependencies on institutions or technology.
- Deposit: Check how deposits and withdrawals work, any account-specific limits or fees, and whether payments can be made directly from the account.
- MMF: Check how to buy or sell shares, when sale proceeds become available, the fund’s liquidity rules, brokerage charges, and any minimum investment.
- Stablecoin: Check redemption eligibility and timing, fees, exchange or custodian requirements, transfer costs, and whether the receiving service supports the token on the same blockchain network.
For all three, test the exact product rather than relying on category labels. An account, fund, or token can have different access terms from another product in the same category.
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For insured operating cash and ordinary payments
Start with an eligible bank deposit if your priority is day-to-day banking and potential FDIC insurance. Verify the bank, ownership, and coverage conditions for the specific account, then compare its current rate and payment features with alternatives.
For brokerage cash management or short-term investment exposure
An MMF may fit when you want an investment fund holding short-term instruments and already use a brokerage. Evaluate the fund’s portfolio, share class, yield after fees, and how quickly proceeds become usable. Do not count its shares as FDIC-insured deposits.
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For digital settlement or on-chain transfers
A stablecoin may serve a purpose that a bank account or MMF does not: transfer of a token through supported digital-asset infrastructure. Consider it only after reviewing issuer terms, reserves, redemption access, custody, and network dependencies. Its digital-transfer utility is a different benefit from deposit insurance or a fund investment.
A practical product-by-product checklist
- Identify the claim. Write down whether you would be a bank depositor, fund shareholder, or token holder, and name the institution or issuer involved.
- Verify protection and backing. For deposits, confirm the insured bank and account structure; for an MMF, inspect the fund and share class; for a stablecoin, read issuer reserve disclosures and redemption terms.
- Calculate comparable net return. Record the product, date, APY or yield measure, fees, minimums, promotional terms, and—for a token reward—the paying party and conditions.
- Map the path to spendable funds. Note required business hours, steps, limits, settlement delays, fees, and any bank, broker, exchange, custodian, or blockchain the path depends on.
- Match the product to the purpose. Decide whether you need insured operating cash, short-term fund exposure, or digital transfer utility; do not choose based on yield alone.
Further reading on the banking context
For a discussion of possible implications of stablecoins for bank deposits, credit, and financial intermediation, see the Federal Reserve Board staff note, Banks in the Age of Stablecoins: Some Possible Implications for Deposits, Credit, and Financial Intermediation, published December 17, 2025.
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