Designing Yield-Bearing Stablecoins Backed by Treasuries: Guardrails and Gotchas

TL;DR (for busy decision-makers)

• So, if you’re looking to get into a payments stablecoin in the U.S. or EU, here’s the scoop: you generally can’t pay interest to holders. If you want to share T-bill yields, you’ll need to treat it as a security or debt instrument and keep the distribution pretty exclusive (which often means leaving out U.S. retail investors). (pwc.com)
• Take a look at tokenized cash-equivalent funds like BlackRock's BUIDL or Franklin’s BENJI--they really show how the system can run smoothly. Just imagine daily on-chain dividends, USDC off-ramps, and being recognized as collateral. Just a little heads-up, though: these are investment products, not your standard retail stablecoins. (prnewswire.com)

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Why this matters now

• U.S. Law: Back in mid-2025, Congress introduced the GENIUS Act, and it’s basically the first federal law focusing on “payment stablecoins.” This law does a couple of key things: it makes sure payment stablecoins can’t earn yield or interest, sets up different licensing tiers, and requires issuers to maintain 1:1 liquid reserves with monthly reporting. So, when does it all go into effect? It’ll kick in either 18 months after the law was passed or 120 days after the agencies finalize the rules (which they’re expected to wrap up within a year). (reuters.com)
• EU Law: The MiCA regulations for stablecoins are now officially live! Whether you're dealing with euro or non-euro stablecoins, MiCA makes it clear that issuers and crypto asset service providers (CASPs) can't offer any “interest or benefits” based on how long you hold onto them. It also ensures that you can redeem them at par, and it comes with some pretty strict reserve and custody requirements. Check it out here: (eur-lex.europa.eu).
• Market Signal: Institutional tokenized cash products are really gaining momentum. BlackRock's BUIDL hit over $1 billion in assets under management back in 2025! These shares offer daily on-chain dividends, enable 24/7 peer-to-peer transfers, and are getting used as collateral on major trading platforms. Check it out here!

Implication: If you're looking to roll out a Treasury-backed, yield-bearing dollar token in 2025, it's crucial to ensure that your design, licensing, and go-to-market strategies really fit within these established guidelines.

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The taxonomy that matters (and why words get you regulated)

When teams talk about "yield-bearing stablecoin," regulators usually see it in a bunch of different ways:

• Payments Stablecoin (In the U.S., we refer to it as the GENIUS Act “payment stablecoin,” while in the EU, it’s known as EMT under MiCA). The main legal detail to keep in mind is that these stablecoins can be redeemed at par, which means you won’t earn any interest or yield on them. There’s a pretty tight reserve and disclosure requirement going on as well. These stablecoins mainly serve the purpose of payments, settlements, and floats. If you're curious to dive deeper into this topic, check it out here.
• Asset-Referenced or Securities-like Tokens That Offer Yield. Here are a few examples you might find interesting:
  • Tokenized Money Market Funds: Check out Franklin Templeton’s BENJI and BlackRock’s BUIDL. These guys keep a stable or nearly stable NAV, dish out daily dividends, and only let KYC’d holders get in on the action. If you want more details, you can find them here.
  • Structured Tokens: Have a look at Ondo USDY. This is a secured debt, yield-bearing token that’s not distributed in the U.S. You can start transferring it around 40-50 days after it’s issued. For more info, check it out here.
  • Rebase Stablecoins: A solid example here is Mountain Protocol’s USDM. It’s got a Bermuda Class F license and offers daily rebasing from T-bill/repo income, but just a heads up--it’s not available for U.S. persons. To dig deeper, you can learn more here.

When you're dishing out yield to holders, you can almost guarantee you'll be seen as a security--unless you're in a spot that has a special digital asset license and has clear rules about distribution.

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Regulatory guardrails you cannot dodge

United States (GENIUS Act 2025)

• Scope/definition: Alright, let’s talk about “payment stablecoins.” These are specifically built for making payments and settling transactions. They’re meant to be convertible 1:1, and the kicker is that they don’t earn any interest or yield. If you want to dive deeper into this topic, feel free to check it out here: (pwc.com).
• Supervision split: So, here's the deal with supervision: national banks are watched over by their primary regulator, while large state banks fall under the Fed's wing. Some non-banks get the OCC's attention if they meet specific market-cap thresholds. As for the smaller issuers, they're typically overseen by state regimes if they’re considered “substantially similar.” If you want to dive deeper into this, check out the details over at (pwc.com).
• Transparency & reserves: For backing, we’re looking at a trustworthy 1:1 ratio with cash or short-term Treasuries. It's crucial that there are monthly disclosures, solid consumer protections, and absolutely no misleading info about FDIC insurance. If you're curious and want to learn more, check out (pwc.com).
• Timeline: So, let’s talk timing--this will take effect either 18 months after it’s passed or 120 days after the final rules are announced (which should be out within the next 12 months). It’s a smart move to start mapping out your plans around these dates. If you want more details, check it out here: (pwc.com).

Design Takeaway

If you’re aiming for yield passthrough in the U.S., it’s best to avoid sending it as a “payment stablecoin.” Instead, think about using a securities or debt wrapper (only for qualified investors) or opt for an offshore/non-U.S. flow, while definitely keeping an eye on strict transfer controls.

European Union (MiCA)

• Interest ban: So, here's the scoop: under MiCA Article 50 (EMTs) and similar guidelines for ARTs, issuers and CASPs aren’t allowed to dish out any interest or bonuses based on how long you keep your tokens. For all the nitty-gritty details, take a look here.
• Par redeemability & reserves: We're aiming for a straightforward 1:1 fiat redemption. This means we’ll keep our reserves separate and secure, conduct regular liquidity stress tests, and set limits on using non-euro tokens for transactions when things get a bit hectic. For more details, check out the insights here.

Design Takeaway

So, here’s the deal: In the EU, if you're dealing with a yield-generating "stablecoin," it doesn't qualify as an EMT. To keep everything organized, it’s best to handle the yield through another instrument, like a tokenized fund share, and ensure that the payment token stays straightforward and neat.

AML, sanctions, and Travel Rule (global)

• U.S. BSA/FinCEN: So, if you’re dealing with cryptocurrencies for your customers, you're officially labeled as a money transmitter (MSB). This means you really need to get on board with KYC, keep an eye out for any suspicious activities, and make sure you're following the Travel Rule compliance (31 CFR 1010.410(f)) from the start. Want to dive deeper? Check it out here.
• OFAC: Sanctions compliance isn’t something you can overlook--it’s strict liability, after all. You’ll want to implement IP/geofencing, wallet screening, and have solid procedures in place for blocking and reporting. Also, don’t forget to establish an auditable sanctions program tailored to your unique risk profile. If you want to dive deeper into this, check it out here.
• FATF (2025 update): There’s some fresh news regarding Recommendation 16, also known as the “Travel Rule.” It's been streamlined a bit, which is great! Just make sure your VASP messaging and due diligence processes are set up to handle standardized originator and beneficiary data on a global scale. If you want to dive deeper into the details, check it out here.

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Three architectures that pass enterprise due‑diligence

1) Rebase Stablecoin (Daily Yield → Supply Rebases)

• How It Works: Each day, the token supply increases to reflect the income produced from T-bills and repo agreements. A great example of this is USDM, but just a heads-up--it’s not available in the U.S. Instead, it runs under Bermuda's Class F regulations and utilizes SPV trust segregation. For more info, you can dive into the details here.
• The Upside: It’s crafted to give you that “real money” vibe at just $1, and it also hooks you up with an instant flow of the risk-free rate right on-chain.
• Things to Keep an Eye On:
  • DeFi Compatibility Issues: The whole rebase mechanism can really throw a wrench in the works when it comes to accounting norms, especially in lending and Automated Market Makers (AMMs). This might lead to some unexpected liquidations or fairness hiccups. Because of this, many protocols either limit or completely block rebasing tokens. If you want to integrate these with DeFi, it’s a smart move to use wrappers that can handle the rebases smoothly. You can dive deeper into that here.
  • Distribution Limitations: Unfortunately, these tokens are often a no-go for U.S. residents to avoid any pesky securities issues. If you're curious to learn more about this, check it out here.

2) Share-based, ERC-4626 Vault Token (yield → share price or claim token)

• Mechanics: The ERC-4626 standard really simplifies how we deal with deposits and withdrawals. You can see your income increase either through a rising share price (what we like to call “accumulating”) or by picking up an extra reward token. There are also handy extensions, like ERC-7540, that manage asynchronous flows. This comes in really handy when the underlying settlement takes its time, like with fiat wires or those pesky money market fund cutoffs. Dive into the details here: (eips.ethereum.org).
• Pros: You’ll enjoy some seriously impressive DeFi composability! It’s super easy for integrators to understand the difference between shares and assets, plus setting up price oracles feels like a walk in the park.
• Gotchas: If you're considering launching this as "money," just a friendly warning--offering yield might run into some legal issues in the U.S. and EU. It’s probably a smarter move to treat it as a fund or security for qualified investors rather than a payment option.

Tokenized Fund Share (Stable NAV, On-Chain Dividends)

• Mechanics: We're diving into the world of tokenized government money market funds (MMFs) that fall under the 1940 Act or the more private 3(c)(7) setups. BUIDL is pretty cool because it hands out daily dividends right on the blockchain, keeps its share price stable at $1, and offers a smart-contract off-ramp for USDC. Plus, you can even use it as collateral on different exchanges. Want to learn more? Check it out here.
• Pros: It comes with solid trust credentials, provides institutional custody, works within a clear securities framework, and the best part? You can earn a genuine yield while keeping a steady NAV.
• Gotchas: Keep an eye on those KYC/eligibility requirements, minimum investment amounts, and transfer limits. And just so you know, this isn't designed for retail payments.

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Reserve construction and operational plumbing

• Asset mix: When it comes to keeping your liquidity in check and making the most of rates, it's best to keep things straightforward. Think short-dated U.S. T-bills and overnight repos as your go-to options. With the SEC's 2023 changes, government money market funds (MMFs) now have stricter rules, requiring at least 25% in daily liquid assets and 50% weekly. And just a heads up, institutional prime funds will face mandatory liquidity fees if net redemptions spike by 5% or more on any given day (but thankfully, government funds don’t have to worry about this fee). So, be sure to factor this into how you set up your liquidity buffers and talk to your customers about it. (sec.gov)
• Custody chain: Always opt for bankruptcy-remote SPVs and keep those trust accounts separate. It's smart to document UCC Article 8 securities entitlements whenever it makes sense. Check out Mountain Protocol’s documentation--it highlights an orphan SPV structure with trust oversight that's becoming a solid best practice for asset segregation. You can find more details here: (docs.mountainprotocol.com)
• Cut-offs and holidays: When it comes to Fedwire and MMF dealing windows, keep in mind that if you want “T+0 24/7” redemptions, you’re going to need a liquidity sleeve (like a USDC facility). A solid example of this is BUIDL’s USDC off-ramp, which acts as a smart-contract liquidity layer that settles instantly while the fund manages the underlying leg a bit later on. Check it out here: (circle.com).
• Minimums and gates: Make sure to watch for those minimum primary subscriptions and redemptions--usually ranging from $50k to $5m--and keep track of the transfer-eligibility checks. If you're shooting for a smooth retail experience, having market-maker lines is key, along with clearly sharing info about cut-offs and NAV timing. (ondo-finance.pages.dev)

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Oracles and attestations: what “proof” actually means

• NAV/reserve oracles: These are on-chain data services that pull fund administration, NAV, and reserve info directly from reliable sources. This means they’re tough to tamper with, plus they come with service-level agreements (SLAs) for updates. If you're interested, take a look at Chainlink’s SmartData/NAVLink. It provides standardized feeds for reserves, NAV/AUM, and minting guarantees, which can be super useful if you're planning to integrate tokenized funds into lending markets. You can dive deeper here.
• Off‑chain attestations: Publishing monthly reserve attestations alongside your SOC-report coverage is definitely a smart move. With the MiCA/GENIUS timelines in play, keeping your disclosures consistent is key. Be sure to reconcile your on-chain supply with your off-chain custody statements at a specific cut-off time to ensure everything lines up. For more details, check it out here.
• Circuit breakers: Make sure to add an emergency oracle pause. It’s a good idea to set up a throttle for issuing and redeeming, as well as a deviation circuit -- think around ±20 basis points from $1 over a specific number of blocks. This helps you stop DEX routers and lending oracles in their tracks, which can really help avoid those nasty cascading liquidations.

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Tax and withholding gotchas (don’t learn these the hard way)

• U.S. holders: If you're dealing with rebases and on-chain dividends, brace yourself--these are generally going to be considered ordinary income events. For U.S. folks holding assets, get ready for some 1099 reporting where applicable, and be prepared to keep a close eye on your basis tracking as you grow your investments.
• Non-U.S. holders:
  • If you're a nonresident alien, you’ll be pleased to know that portfolio interest and certain types of bank or deposit interest won’t face U.S. withholding tax, as long as your paperwork is in order (think W-8 forms). Just keep in mind, you still have to meet those reporting requirements. (irs.gov)
  • Distributions from money market funds might come with “interest-related dividends.” Good news! These are exempt from the 30% withholding that non-U.S. holders usually face under IRC §871(k). But be careful--classification and reporting can get a little complicated. It’s smart to touch base with fund counsel and administrators to make sure you’re on the right track. (irs.gov)
• Practical tip: When you’re getting new folks onboard, don’t forget to weave in W-8/W-9 collection and FATCA/CRS flags into your smart flows. Plus, linking each income type with the correct withholding rules in your payout contracts is super important!

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DeFi integration: where most teams get cut

• Rebasing vs. Shares: In the DeFi space, when it comes to collateral setups, folks usually opt for balance-stable ERC-20 tokens. If you ever find yourself in a position where rebasing is necessary, consider providing a non-rebasing wrapper for your protocols. Another route is the ERC-4626 share model, which presents any yield either through price changes or by using a reward token. A standout example of this approach is Ondo’s OUSG, which offers both accumulating (price-rising) and rebasing options. It’s definitely a model worth checking out! (ondo-finance.pages.dev)
• Collateral acceptability: Tokenized funds are definitely gaining traction as collateral options these days. For example, take a look at BUIDL on Deribit and Crypto.com. Just a heads up, though--be prepared for some haircuts, oracle whitelists, and possibly a few transfer restrictions from protocol guardians. (prnewswire.com)
• Asynchronicity: If you want to link real-world settlements to the blockchain, why not try out ERC-7540-style request/claim flows? This approach helps you dodge those annoying stuck transactions and failed redemptions that tend to pop up during off-hours. Check it out here: (ethereum.org)
• Sanctions controls on-chain: Setting up allowlists and denylists right at the token contract level is definitely a smart move. This means you can pause, seize, or block transactions wherever the law requires it. And hey, don’t skip on creating an OFAC response runbook! The process should look like this: detect → freeze → report within 10 business days. After that, make sure to stay on top of those annual reports. Check out more details here.

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Case studies with concrete design takeaways

• Mountain Protocol USDM (rebasing, yield-bearing, offshore retail): This one’s got a fancy Bermuda Class F license, and they’re stashing their assets in T-bills and repos. They do daily rebases and operate through a segregated SPV trust. Oh, and a heads up--they don’t serve U.S. persons. If you're on the lookout for "yield as money" outside the U.S. or EU retail markets, this could really be a solid choice with some strong governance backing it up. Just make sure you keep an eye on that DeFi rebase friction. (docs.mountainprotocol.com)
• Ondo USDY (secured note, yield-bearing, non-U.S.): You’ll be able to transfer this beauty 40-50 days after it’s issued. Just keep in mind that they mint and redeem only on business days. They also take stablecoins and wire transfers, which is super convenient. Plus, it’s set up as debt with some restrictions based on where you’re located and your investor status. If you’re looking for a simple way to branch out beyond the U.S. with clean documentation, this is definitely a solid pick. (blog.ondo.finance)
• BlackRock BUIDL (tokenized MMF for institutions): This is a stable token worth $1 that dishes out daily on-chain dividends. It features a USDC smart-contract off-ramp and is eligible as collateral on major platforms. If you're looking to reach institutional treasurers and prime brokers, going with a tokenized fund is likely the safest and most flexible option. (prnewswire.com)
• Franklin BENJI (on-chain government MMF): This is the very first mutual fund in the U.S. that's registered and uses a public chain to keep track of shareholder records. It’s now set up for P2P transfers and has USDC on-ramps designed just for institutions. This makes it a great option for regulated treasuries looking to earn some yield while maintaining a stable NAV. Check it out here: (franklintempleton.com)

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Implementation checklist (2025‑proof)

Regulatory and Legal

• Decide: Are we leaning towards a payments stablecoin (which doesn't offer any interest) or something more like a yield-bearing security or tokenized fund? Let’s get on the same page with the GENIUS Act and MiCA right from the start. (pwc.com)
• Map Licensing: We’ve got to determine if we’re after a bank, trust, or EMI license, or possibly an OCC/non-bank license. Another option could be checking out an offshore DABA-style license with SPV trust segregation. You can find more info here.
• Embed OFAC/BSA: Remember to check if MSB registration is something we need to handle. We've got to sort out KYC, get our Travel Rule messaging in place, and have a sanctions runbook prepped and ready. (fincen.gov)

Financial and Reserve Ops

• Choose Your Reserve Channel: Go ahead and choose from direct T-bills, government MMFs, or repos. Make sure to jot down dealing cut-offs, liquidity sleeves, and keep an eye on how the funds act during holidays. (sec.gov)
• Monthly Disclosure: Keep everyone in the loop by detailing what you have on hand, how long it’s been around, and who you’re working with. Don't forget to compare supply against reserves and get those independent attestations in place! (pwc.com)

Smart Contracts and Data

• Token model: We're diving into the ERC‑4626, and if you're feeling adventurous, consider adding ERC‑7540 for those async features. Plus, there's an optional wrapper for rebase compatibility, and EIP‑2612 brings some cool extra permissions to the table. You can find more info here.
• Oracles: We're tapping into standardized feeds for the NAV and reserves. Just a heads up to include some deviation guards and pause keys. And remember, it’s super important to have a documented policy for all this. You can dive deeper into it here.

Market Integration

• Redemptions: We've set up a convenient 24/7 swap option (similar to USDC) with straightforward rules on managing dividends for both full and partial exits. You can dive deeper into this by checking out Circle's press release.
• Collateralization: It's super important to reach out to venues ahead of time for stuff like haircuts, whitelisting, oracle alignment, and putting together those transfer-eligibility lists. If you want to dive deeper into this topic, check out PR Newswire.

Tax/withholding

• Create a system that automatically collects W‑8 and W‑9 forms. Be sure to link the distributions to the right 1099 and 1042-S forms, and don’t forget to use portfolio interest and §871(k) when it’s relevant. You can check out more details on this over at the IRS website.

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“Gotchas” we see most in diligence

• Watch out for interest leakage in prohibited regimes: If you’re giving any holder a "benefit" based on how long they've had something, you could be crossing the line with GENIUS or MiCA regulations. Even those cool "rewards" that seem like just marketing could actually fall under the definition of “interest”--so it’s smart to read the fine print. Check it out here: (pwc.com)
• Oracle/NAV drift: Keeping your NAVs fresh is super important; otherwise, you risk running into big problems like arbitrage or liquidation cascades. Be sure to update your SLAs to match up with your fund dealing cycles, and remember to include steps for responding after any incidents. (docs.chain.link)
• Rebase Shock in DeFi: Keep an eye on those rebases when liquidation windows hit--they can really throw your solvency for a loop. Seriously, it’s smart to consider offering non-rebasing wrappers and have a conversation with your protocol risk teams before launching any new listings. (ethereum.org)
• Redemption bottlenecks: Rolling out “24/7 redemptions” without a solid liquidity backup is a surefire way to hit a wall, particularly during holidays and weekends. You might want to check out BUIDL’s approach with their USDC off-ramp strategy for some inspiration. (circle.com)
• MMF reform blind spots: Watch out for those mandatory liquidity fees--they can really surprise institutional prime funds. Keep your communications and buffers crystal clear; even if you’re relying on government funds, it’s super important to keep your counterparties informed. (sec.gov)

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A practical options map for 2025

• If you’re diving into payments and want to set up a retail presence in the U.S. or EU, consider a non-yield payments stablecoin under GENIUS/MiCA. You can earn from T-bill yields at the issuer level (similar to USDC) and benefit from issuer economics instead of just waiting on payouts to holders. For more info, take a look here.
• Looking to help your holders earn some yield? Here are a few options to consider:
  • Non-U.S. retail: You might want to check out a rebasing stablecoin that has a solid offshore license, like Bermuda Class F. It comes with strict KYC regulations and composability wrappers. For more info, click here.
  • Institutions: How about offering tokenized government money market fund shares along with on-chain dividends? Plus, you can provide an easy off-ramp to USDC and collateral pathways. You can dive into the details here.
  • Global but with restrictions: Consider structuring it as a secured note or fund share (like USDY) that limits distribution within the U.S. This way, you can have predictable minting and redemption on business days. For further insights, check it out here.

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Closing thought

Treasury-backed, yield-bearing assets are already making waves on public chains, accumulating impressive assets under management (AUM), staying on the right side of regulations, and offering some really effective tools. The question isn’t so much about whether we can pull this off anymore, but more about how we can do it legally, boost liquidity, and smoothly mesh with DeFi while avoiding any missteps. If you can get the legal framework, reserve management, and on-chain design strategies lined up as described here, you'll be all set to roll out something robust that’s primed for the banking sector.

7Block Labs

At 7Block Labs, we’re here to help regulated institutions, fintechs, and web3 scale-ups design and launch compliant, flexible stable-value and tokenized cash products. If you’re up for a design review or want to jump-start a build sprint, we’d be excited to chat with you!

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References for Key Facts Cited:

• Curious about MiCA's interest ban and redeemability requirements? Check out the details here.
• If you're looking for info on the U.S. GENIUS Act, including its scope, interest prohibition for payment stablecoins, timelines, and oversight, it’s all laid out here.
• The SEC’s reforms on money market funds--covering things like liquidity, fees, and the removal of gates--are discussed in this release.
• Want to see some examples of tokenized funds and infrastructure? Look into BUIDL, BENJI, USDC off-ramp, and collateral acceptance in this article.
• Interested in yield-bearing non-U.S. structures like USDM and USDY? You can find out how distribution and transfer work here.
• Got questions about AML, sanctions, the Travel Rule, or tax regulations? You can find the answers here.