T-Bill Backed Stablecoins Explained: How They Work and Whether They're Worth It
By Jorge Rodriguez — Stablecoins
How T-bill backed stablecoins work: the mechanics of converting US Treasuries into yield-bearing digital dollars
A comparison of the main T-bill stablecoins, USDY, BUIDL, USDO, and USD0, including yield models and access requirements
Whether T-bill stablecoins are actually safer or just differently risky: the five risk categories that matter
What Are T-Bill Backed Stablecoins?
T-bill backed stablecoins are a category of dollar-pegged tokens built around one core design choice: the yield from US Treasury bills flows to the token holder, not the issuer. USDC and USDT also hold T-bills in their reserves, but they keep that income as operating revenue. T-bill backed stablecoins pass it through. That distinction has real dollar value. US 3-month Treasury bill rates ranged between 4% and 5.5% annually from 2023 into 2025, driven by the Federal Reserve's rate-hiking cycle. For investors holding stablecoins idle between strategies or as a savings position, that was a meaningful yield gap that this category of products was designed to close. Understanding what T-bill backed stablecoins are requires distinguishing them from two other categories that sometimes get confused with them. Algorithmic stablecoins use protocol mechanics and governance tokens to maintain their peg and have no real-world asset backing. DeFi yield stablecoins earn returns through lending, liquidity provision, and funding rate strategies. T-bill backed stablecoins do neither. The collateral is real-world government debt, held off-chain by a regulated custodian. The token is an on-chain representation of a legal claim on that debt. For context on how this fits the broader stablecoin landscape, the [stablecoin risk tiers guide](/blog/stablecoins/stablecoin-risk-tiers) classifies stablecoins across their primary risk dimensions. T-bill backed stablecoins occupy a distinct position within that taxonomy. For more on how stablecoins generate yield in general, [how stablecoins earn interest](/blog/stablecoins/how-stablecoins-earn-interest) explains the mechanics across multiple stablecoin categories. The tokenized Treasury market grew to over $7 billion in assets by mid-2025, more than doubling in a single year according to [RWA.xyz data](https://app.rwa.xyz/treasuries). Several major financial institutions and crypto-native protocols now operate products in this space. This article explains the mechanics, the main products, the yield structure, and the real risks so you can evaluate whether this category belongs in your allocation.
How T-Bill Backing Works: From Treasury to Token
 The process that converts a US Treasury bill into a token in your crypto wallet follows a consistent pattern across issuers, even when the legal structures and chains differ. **Step 1: Capital deposit** Users deposit USDC, USDT, or fiat currency with the issuer or into an issuer-controlled smart contract. This capital is the starting point for the entire structure. **Step 2: T-bill purchase** The issuer takes the deposited capital and purchases short-term US Treasury bills, typically with maturities of four to twenty-six weeks. These T-bills are held off-chain by a regulated custodian, such as a licensed broker-dealer, trust company, or major financial institution. The custodian holds the actual securities, not the issuer. The on-chain token does not represent a T-bill directly. It represents a legal claim on the pool of T-bills the custodian holds. This distinction matters: tokenized T-bill stablecoins are not T-bills on-chain. They are on-chain representations of a legal right to the value of off-chain government debt. Understanding how real-world assets are tokenized in general is covered in the [real-world asset tokenization guide](/blog/tokenized-assets/real-estate-tokenization-guide), which explains the same fundamental pattern applied to property and private credit. **Step 3: Token issuance** The issuer creates on-chain tokens representing claims on the T-bill pool. These can be ERC-20 tokens on Ethereum, SPL tokens on Solana, or equivalent standards on other chains. Each token is designed to be redeemable for $1 of underlying value. **Step 4: Yield distribution** As T-bills earn interest, the issuer credits that yield to token holders. The mechanism for doing this varies by product: some add new tokens to your wallet, others increase the redemption value per token. The issuer retains an annual management fee, typically 0.15% to 0.50%, and passes the remainder to holders. **Step 5: Redemption** To exit, holders redeem tokens with the issuer, who liquidates the corresponding T-bill holdings and returns cash or stablecoin. Settlement takes one to two business days, reflecting the T+1 to T+2 settlement conventions of government securities markets. **The SPV structure** Most issuers use a Special Purpose Vehicle (SPV) to ring-fence T-bill assets from their own corporate balance sheet. If the issuer faces financial difficulty, the SPV is designed to keep T-bill assets legally separated and protected for token holders. The effectiveness of this protection depends on jurisdiction and has not been tested in a major insolvency proceeding at scale. **KYC and access** Because these tokens involve tokenized securities, minting and redemption require identity verification. Most products restrict access by jurisdiction as well, with many designed specifically for non-US persons due to US securities law. On-chain transfers after minting may have fewer restrictions depending on the product's compliance design, but issuers differ on this. Think of the overall structure as a money market fund where the share is an ERC-20 token you hold in a crypto wallet. The underlying economics are similar. The access mechanism and risk profile differ from a traditional brokerage account.
The Main T-Bill Stablecoins Right Now
The tokenized Treasury space has attracted both established financial institutions and crypto-native protocols. Here are the main products in the category as of early 2026. **USDY: Ondo Finance** USDY (Ondo US Dollar Yield Token) is issued by Ondo Finance, a US-regulated digital asset firm. The token is backed by short-term US Treasury bills and bank demand deposits. It uses a price-accumulating model: your token balance stays fixed while the redemption value of each token rises over time to reflect accrued yield. A USDY token purchased at $1.00 becomes redeemable for more as interest accumulates. USDY is available on Ethereum and multiple other chains. Minting and redeeming requires KYC and is restricted to non-US persons in its standard form due to US securities law. Secondary market trading may be available under different conditions depending on jurisdiction. Current product documentation is available on the [Ondo Finance USDY page](https://ondo.finance/usdy). **BUIDL: BlackRock via Securitize** BUIDL is the BlackRock USD Institutional Digital Liquidity Fund, tokenized by Securitize. It holds cash, US T-bills, and repurchase agreements. As of April 2025, BUIDL had surpassed $1.94 billion in assets under management, making it the largest product in this category by a significant margin. Unlike USDY, BUIDL uses a rebasing model: the token price stays fixed at $1.00, and new tokens are distributed daily to reflect accrued yield. Access is restricted to institutional, KYC-verified whitelisted wallets. This is not designed for retail DeFi participants. The fund launched on Ethereum and has since expanded to Avalanche, BNB Chain, and other networks. **USDO: OpenEden** USDO (OpenDollar) is OpenEden's yield-bearing stablecoin, launched in mid-2025. It is backed by OpenEden's TBILL token, which represents a tokenized portfolio of US Treasury Bills held through a regulated fund structure with established financial infrastructure as custodian. USDO is designed to target broader DeFi composability than institutional-only products while operating within a regulated framework. Supply normalized to approximately $100 million by late 2025 after peaking during a mid-year incentive program. Details on the underlying structure are available at [OpenEden's TBILL documentation](https://openeden.com/tbill). **USD0: Usual Money** USD0 is a decentralized stablecoin collateralized 100% by US Treasury Bills and repurchase agreements. Usual describes it as an RWA stablecoin that aggregates various tokenized T-bill products as collateral. Yield does not accrue in USD0 directly. Instead, holders stake USD0 to receive USD0++, the yield-bearing wrapper that distributes the underlying T-bill returns. The protocol also has a governance token (USUAL) that captures additional protocol value. USD0 reached approximately $1.5 billion in circulating supply in early 2025. **A note on OUSD (Origin Protocol)** OUSD is sometimes grouped with T-bill stablecoins due to keyword overlap, but it is not a T-bill backed stablecoin. OUSD earns yield through on-chain DeFi strategies, including Morpho and stablecoin liquidity pools, not from US Treasuries. Its collateral is stablecoins (USDC, USDT, DAI), not government debt. This is a common source of confusion: OUSD is a DeFi yield stablecoin with on-chain yield sources, not a T-bill product. To compare live yields across USDY, USDO, and other stablecoin categories in real time, the [Lince Stablecoin Tracker](https://yields.lince.finance/tracker/solana/category/stablecoins) tracks these alongside protocol yields across chains.
What Yield Do You Actually Earn?
The yield on T-bill backed stablecoins is not set by a protocol or governance vote. It is determined by the US Federal Reserve and the Treasury market. **The underlying rate** Short-term US Treasury bill yields track the Federal Funds Rate closely. Between 2023 and 2025, 3-month T-bill rates ranged between 4% and 5.5% annually, driven first by the Fed's rate-hiking cycle and then by gradual easing. These are gross rates. The net yield to the holder is the gross T-bill rate minus the issuer's annual management fee, which typically ranges from 0.15% to 0.50%. On a 4.5% gross yield, that translates to approximately 4.0% to 4.35% net for the token holder. **Two distribution models** How yield reaches you depends on the product you hold. Rebasing (balance increase): • The token price stays fixed at $1.00. • New tokens are automatically added to your wallet to reflect accrued yield. • BUIDL uses this model, distributing new tokens to holders daily. • Advantage: intuitive for holders who expect their dollar balance to grow over time. • Limitation: some DeFi protocols do not handle rebasing tokens cleanly, which restricts composability in lending markets and liquidity pools. Accumulating (price appreciation): • Your token balance stays fixed. • The redemption value per token rises over time. • USDY uses this model. A token purchased at $1.00 can later be redeemed for more as yield accrues. • Advantage: cleaner DeFi composability since the token itself appreciates in value rather than changing supply. • Limitation: less intuitive for holders who expect a stable $1 price per token. Neither model produces more total return than the other on identical capital. The difference is mechanical: how yield is represented, not how much yield is generated. **Yield is rate-dependent, not fixed** T-bill stablecoin yields move with Fed policy. This makes them categorically different from DeFi yield strategies driven by protocol incentives and liquidity mining. DeFi yields can be significantly higher during bull markets and significantly less predictable. T-bill yields are lower but tied to a real-world benchmark with observable drivers. When the Fed cuts rates, yield on T-bill stablecoins compresses. When the Fed raises rates, yield rises. Investors evaluating this category during a rate-cutting cycle should factor this into their expected return calculations. For context on how T-bill stablecoin yields compare to other on-chain yield instruments, see the [yield-bearing assets guide](/blog/yield-strategies/yield-bearing-assets).
The Real Risks of T-Bill Backed Stablecoins
 "Backed by US Treasuries" sounds like an unqualified safety guarantee. It is not. T-bill backed stablecoins carry a distinct set of risks, different from DeFi yield strategies but not absent. Understanding the specific risk categories is essential before allocating capital. **Custodian and counterparty risk** The T-bills backing these tokens are held off-chain by a regulated custodian. If that custodian faces financial difficulty or insolvency, redemption of your tokens may be delayed or complicated, even if the underlying T-bills are intact and solvent. SPV structures provide legal separation between issuer assets and T-bill assets, but outcomes in an actual insolvency scenario are jurisdiction-specific and remain untested at scale in the tokenized asset context. This counterparty risk sits underneath every T-bill stablecoin position. Understanding how this compares to other forms of DeFi counterparty exposure is covered in the [counterparty risk in DeFi guide](/blog/risk-management/counterparty-risk-defi). **Regulatory risk** T-bill backed stablecoins straddle the boundary between stablecoins and tokenized securities. Regulatory treatment varies by jurisdiction. Most products require KYC and restrict access to specific user types precisely to manage this ambiguity. A regulatory reclassification could force redemptions, restrict transfers, or make products unavailable in certain regions. The US GENIUS Act and the EU's MiCA framework are creating clearer structures, but what is compliant under current rules may require restructuring as those frameworks mature and enforcement practices develop. **Redemption and liquidity risk** Exiting a T-bill stablecoin position is not the same as selling USDC. Redemption requires going back to the issuer through a compliance process, and settlement takes one to two business days. Secondary market liquidity varies significantly by product. BUIDL is restricted to institutional whitelisted wallets, meaning exit options outside of issuer redemption are extremely limited. USD0++ experienced a notable liquidity event in January 2025, dropping below $0.92 when the protocol adjusted its redemption terms. This illustrated how secondary market prices can diverge from par value even for T-bill-backed products during stress periods. **Smart contract risk** Sound off-chain collateral does not eliminate on-chain risk. The token contract can contain bugs. Upgradeable contracts introduce admin key risk. DeFi integrations layer additional smart contract exposure on top of the base product risk. If you use a T-bill stablecoin as collateral in a lending protocol, you carry both the stablecoin's structural risk and the lending protocol's smart contract risk simultaneously. **Rate risk** A significant Federal Reserve rate-cutting cycle compresses T-bill yields. Because T-bills have short maturities, the portfolio reprices relatively quickly as existing bills mature and new ones are purchased at current rates. This is not a capital loss, but it changes the return profile substantially and can reduce the yield advantage over holding regular stablecoins. Before committing capital to any T-bill stablecoin, review the product's legal structure, custodian arrangements, and redemption terms carefully. The [DeFi due diligence checklist](/blog/risk-management/defi-due-diligence-checklist) provides a structured process that applies to T-bill stablecoins as much as to purely on-chain products.
T-Bill Stablecoins vs Regular Stablecoins vs Yield-Bearing Stablecoins
 T-bill stablecoins occupy a distinct position among stable dollar assets. This comparison maps the key trade-offs against the two other main categories. | Feature | T-Bill Stablecoin (USDY, BUIDL) | Regular Stablecoin (USDC, USDT) | Yield-Bearing Stablecoin (sUSDe, USD0++) | |---|---|---|---| | Yield to holder | Yes, T-bill rate (~4-5%) | No, issuer keeps yield | Yes, DeFi or protocol yield (variable) | | Backing | US Treasury bills (off-chain) | Cash, T-bills, reserves (off-chain) | Protocol strategies or T-bill wrappers | | Yield source | US government short-term debt | N/A | DeFi strategies, funding rates, T-bill pools | | Yield stability | Moderate, tracks Fed rate | N/A | Highly variable, can be 8-20%+ or drop sharply | | KYC required | Yes (typically) | No | No (usually) | | DeFi composability | Limited (whitelist, KYC) | High | High | | Regulatory clarity | Medium, securities rules apply | Medium-High | Low | | Redemption | Issuer-gated, T+1 to T+2 | 1:1, near-instant | Varies by protocol | | Smart contract risk | Low-Medium | Low | Medium-High | | Tail risk | Custodian or regulatory failure | Reserve depeg | Strategy blow-up, liquidation | T-bill stablecoins sit between regular stablecoins and DeFi yield instruments in the risk-return spectrum. They offer meaningful yield that regular stablecoins do not pass through, with more predictable risk characteristics than DeFi yield strategies. The trade-offs are composability and access. KYC requirements and transfer restrictions make T-bill stablecoins incompatible with most open DeFi protocols. You cannot freely deposit BUIDL into a lending protocol or provide USDY as liquidity on a DEX in the same way you can with USDC. They are not a replacement for USDC or USDT in DeFi workflows. What they are is closer to a regulated on-chain money market fund: conservative, yield-generating, institutionally structured, with different failure modes than either of the other two categories. The right choice across these categories depends on your use case. For full DeFi composability, regular stablecoins remain the standard. For higher and more variable yield with DeFi integration, yield-bearing stablecoins like sUSDe serve that role. For conservative, rate-linked yield with real-world asset backing, T-bill stablecoins address that gap. For a broader view of how stablecoins serve different functions in DeFi yield strategies, see [the benefits of stablecoins in DeFi yield](/blog/stablecoins/benefits-of-stablecoins-defi-yield).
Who Should Actually Use T-Bill Stablecoins?
Not every stablecoin investor benefits from T-bill stablecoin exposure. Here is a clear breakdown of who this category serves well and where it falls short. T-bill stablecoins work best for holders who: • Park significant stablecoin balances between active strategies and want yield without active management or DeFi protocol risk. • Want US Treasury rate exposure in a crypto-native format, particularly non-US users who cannot easily open US brokerage or money market accounts. • Operate as a DAO or protocol treasury with idle stablecoin reserves and need a compliant, yield-generating allocation backed by real-world assets. • Prefer predictable, rate-linked returns over variable DeFi yields, especially during periods of elevated market uncertainty. • Are willing and able to complete KYC and meet issuer eligibility requirements for their jurisdiction. T-bill stablecoins are not a fit for: • Users who need full DeFi composability. KYC gates and transfer restrictions create friction with most lending protocols, DEXs, and liquidity pools. • US retail investors. Many products restrict access under US securities law, and those that do accept US persons may still face restrictions on how tokens can be used. • Yield maximizers during active bull markets. T-bill rates of 4-5% do not compete with DeFi lending or high-activity liquidity provision at peak market conditions. • Anyone who needs instant, unrestricted exit liquidity. Redemption timelines and whitelisting requirements can become binding constraints during volatile periods. T-bill stablecoins are best understood not as stablecoins with a bonus feature, but as a separate product category: regulated on-chain fixed income. If your goal is stable, rate-linked yield with real-world asset backing and you can meet the access requirements, this category is worth a serious evaluation. If you are comparing T-bill stablecoin yields alongside other stablecoin and DeFi options in real time, the [Lince Stablecoin Tracker](https://yields.lince.finance/tracker/solana/category/stablecoins) tracks yields across major stablecoin categories including both protocol yields and T-bill-backed options.
FAQ
### Are T-bill backed stablecoins safe? They are lower risk than DeFi yield strategies but not risk-free. The principal risks come from custodian failure, regulatory changes, and redemption delays rather than from algorithmic depegging or smart contract exploits in a DeFi pool. Their risk profile is closest to a regulated money market fund: conservative, with real-world asset backing, but dependent on the legal and institutional infrastructure surrounding them. ### What is the difference between USDY and USDC? USDC holds T-bills in its reserves but keeps all the yield as operating revenue. USDY passes that T-bill yield directly to the token holder. USDC is fully composable in DeFi with no access restrictions or KYC requirements for on-chain transfers. USDY requires KYC to mint and redeem, restricts access to non-US persons in its standard form, and has more limited DeFi composability as a result. ### Do I need KYC to use a T-bill stablecoin? For most T-bill stablecoins, yes. KYC is required for minting and redeeming directly with the issuer. Some secondary market trading may be available without completing KYC, but you would be purchasing at market price rather than minting at par, and you cannot redeem without issuer verification regardless. Each product has different rules, and requirements can change as regulatory frameworks evolve. ### Can I use T-bill stablecoins in DeFi protocols? Composability varies significantly by product. BUIDL is restricted to institutional whitelisted wallets and is not available in open DeFi. USDY has more on-chain flexibility and has gained some DeFi integrations, but it is not as freely usable as USDC or USDT in lending protocols and liquidity pools. USD0 (the base stablecoin, not USD0++) is designed for DeFi composability, but yield accrues in USD0++ when staked. Check each product's transfer and integration documentation before deploying capital. ### What happens if the token issuer goes bankrupt? Most issuers structure T-bill holdings via SPVs to ring-fence those assets from issuer liabilities. In theory, the underlying T-bills are segregated from issuer creditors. In practice, this has not been tested in a real insolvency proceeding in the tokenized asset space at meaningful scale. Jurisdictional variation and legal complexity mean outcomes in an actual insolvency are not guaranteed to match the theoretical structure. This is one of the primary risks to understand before investing significant capital. ### How is yield actually paid out? The mechanism depends on the product. BUIDL distributes yield by sending new tokens to your wallet daily, so your balance increases while the price stays at $1. USDY accrues yield into the redemption price of each token, meaning your balance stays fixed and you receive more dollars than you paid when you exit. USD0++ distributes yield proportionally when you hold the staked wrapper. Always confirm the specific distribution mechanics for any product before committing capital. ### What happens to T-bill stablecoin yields when interest rates fall? When the Federal Reserve cuts rates, short-term Treasury bill yields follow. Because T-bills have short maturities, typically four to twenty-six weeks, the portfolio reprices relatively quickly as existing bills mature and new ones are purchased at current market rates. A significant rate-cutting cycle can compress yields from 4-5% toward 1-2% or lower within a few months. This is not a capital loss but it substantially changes the return profile and the value proposition relative to DeFi alternatives.
Conclusion
T-bill backed stablecoins represent a genuine addition to the stablecoin landscape rather than a variation on existing products. They pass US Treasury yield directly to holders, using real-world government debt as collateral in a regulated structure. That makes them meaningfully different from regular stablecoins, which keep the yield, and from DeFi yield stablecoins, which earn through on-chain protocol strategies. The main products in this space, USDY, BUIDL, USDO, and USD0, each have distinct structures, access requirements, yield distribution models, and trade-offs. BUIDL targets institutional participants with strict whitelisting requirements. USDY is more accessible for non-US retail and DeFi users. USDO and USD0 push toward DeFi composability within regulated frameworks. The risks are real and specific: custodian exposure, regulatory uncertainty, redemption friction, and rate sensitivity. None of these are hypothetical. Understanding them precisely is what separates informed allocation from the assumption that "T-bill backed" is synonymous with "safe." The tokenized Treasury market exceeded $7 billion in assets by mid-2025 and continues to expand. This category is worth understanding regardless of whether it fits your current allocation, because it is reshaping how conservative yield-seeking capital operates on-chain.