Tokenized Treasuries vs Stablecoins: The Regulatory Line

Why two dollar-shaped tokens live in different legal worlds

On-chain, a share of BlackRock's BUIDL and a USDC stablecoin look almost identical. Both are ERC-20 tokens, both redeem at one U.S. dollar, and both sit in wallets that read balances the same way. The legal reality behind them could hardly be more different. One is a registered security, the other is, depending on who you ask, a payment stablecoin, a commodity-like instrument, or an unregulated digital asset.

This gap is not an accident. It reflects a deliberate choice by issuers about what they want the token to be, and a slow, uneven process by regulators in Washington and Brussels to retrofit 20th-century rules to 21st-century instruments. The result is a market where two products that look like dollars in a wallet are governed by completely different disclosure regimes, transfer rules, and reserve rules.

For a professional or advanced user, the practical question is not 'which one tracks the dollar better' but 'which one can I hold, transfer, and use as collateral under which rules, and what changes if those rules tighten.' The rest of this article walks through the legal mechanics behind that question.

The risk layer most readers underestimate

Both instruments carry risk, but the risks are layered differently and many users flatten them into 'dollar on a chain' thinking. For a tokenized Treasury fund such as BUIDL, OUSG, USYC, or USDY, the on-chain token is a claim on a fund that holds short-dated U.S. Treasuries and reverse repos. The fund's NAV drifts with rates, the token can trade at a premium or discount to par on the secondary market, and redemptions are T+1 or T+2, not instant. If the underlying Treasuries mark down in a crisis, the token marks down with them.

For a stablecoin like USDC, the risk profile is different. Reserves are held at banks and money market funds, and the issuer (Circle) has stated its intent to bring a larger share of those reserves onto its own tokenized Treasury infrastructure over time. If the underlying bank fails, if the reserve manager mishandles funds, or if the issuer cannot process redemptions at scale, holders stand in line as general creditors. History is instructive: the TerraUSD collapse in 2022 wiped out roughly 40 billion dollars in market value in days, and the depeg of USDC in March 2023 showed that even well-run issuers can be dragged down by the banking system around them.

Layered on top of both is operational risk: smart contract bugs, oracle failures, bridge exploits, and counterparty risk at the venue where the token trades. Several early tokenized Treasury products were launched on chains that have since been deprecated, and at least one issuer was forced to wind down a product after the underlying DeFi venue was sanctioned. Reading the legal wrapper without reading the operational wrapper is how sophisticated users lose money.

How U.S. regulators classify a tokenized T-bill fund

In the U.S., a tokenized Treasury product is treated as a security first and a token second. The fund vehicle behind BUIDL, for example, is a private fund organized as a Cayman or Delaware entity, and the token represents a limited liability company interest in that fund. Because the fund's assets are short-dated U.S. Treasuries and reverse repurchase agreements, the token is an interest in an investment contract and falls under the Securities Act of 1933.

That triggers a stack of obligations. Every subscriber goes through KYC and AML checks before they are allowlisted. The fund files a private placement memorandum, not a public prospectus, and the offering relies on exemptions such as Rule 506(b) or 506(c) of Regulation D. Marketing is restricted to accredited investors in most cases, and resale is limited to other qualified purchasers. The token itself is therefore a restricted security in the SEC's vocabulary.

On top of the Securities Act sits the Investment Company Act of 1940. If the fund holds itself out as a money market-style vehicle and accepts broad subscription, the issuer has to either register as a 40 Act fund or operate under an exemption such as Section 3(c)(7) for qualified purchasers. BUIDL and OUSG are structured as 3(c)(7) funds, which restricts holders to investors with at least 5 million dollars in investable assets. This is the '40 Act fund' overlay that is unique to U.S. fund products and has no clean equivalent in most other jurisdictions.

Why these tokens trade only on permissioned venues

Because the token is a restricted security, secondary transfer is legally constrained. A holder cannot simply send BUIDL to an arbitrary wallet and have it trade on a public decentralized exchange. The standard mechanism is an allowlist of verified addresses and approved venues, with the fund's transfer agent maintaining the list.

In practice, this means tokenized Treasury products trade on platforms like Securitize's regulated marketplace, or on a small number of whitelisted partner exchanges. On decentralized infrastructure, they appear mostly as collateral inside permissioned lending markets, not as free-floating tokens on Uniswap-style AMMs. The irony is that the most 'institutional' crypto product is the one with the least open secondary market, while dollar stablecoins trade on every major venue in the world.

This is a structural choice, not a technical limitation. The fund's counsel signs off on transfer restrictions because that is what keeps the offering exemptions intact. A single unauthorized transfer to a non-accredited wallet can, in theory, blow the exemption and put the fund in violation of securities law. Issuers and their counsel treat this as a load-bearing feature.

How stablecoins slipped into a lighter regime, until now

Stablecoins like USDC, USDT, and their regulated cousins like PYUSD did not, for most of their history, fit cleanly into U.S. regulatory categories. The SEC has argued in enforcement actions that some stablecoins are unregistered securities, while the CFTC has treated Tether-style reserves as commodities in certain cases. For years, the de facto position was a gap: the tokens operated, payment networks integrated them, and the relevant statutes (the Securities Act, the Commodity Exchange Act, the Banking Law) were stretched to cover them.

That gap is closing. The GENIUS Act, which advanced in the U.S. Senate in 2025, creates a federal framework for payment stablecoins. Under the act, an issuer must hold reserves in cash, short-dated Treasuries, and similar instruments, must publish regular reserve attestations, and must meet capital and liquidity requirements. Critically, the act explicitly allows stablecoin issuers to hold tokenized U.S. Treasuries as part of their reserve assets, which is why BlackRock's BUIDL, OUSG, and similar products are suddenly interesting to Circle, Tether, and the next generation of issuers.

That clause matters. It bridges the two worlds this article describes. A stablecoin issuer can back its token with a regulated, audited, blockchain-native Treasury product instead of running its own repo and custody stack. The result is a structure where a tokenized Treasury fund and a stablecoin are literally nested: the stablecoin sits on top of the tokenized Treasury, and each layer is regulated differently.

MiCA's approach: the EMT and ART regimes

The European Union went a different direction with its Markets in Crypto-Assets Regulation, or MiCA, which took effect in 2024 and 2025. MiCA creates two relevant categories for dollar-style tokens: electronic money tokens, or EMTs, and asset-referenced tokens, or ARTs. A token that references a single fiat currency, holds low-risk liquid assets, and is issued by an authorized credit institution or e-money institution is regulated as an EMT. A token that references a basket of assets, commodities, or a more complex reserve profile is regulated as an ART.

USDC, the euro version of which is issued through a French e-money license, fits into the EMT regime. Tokenized T-bill products sold in Europe generally do not, because they are interests in a fund and fall under existing EU fund regulation, often the Alternative Investment Fund Managers Directive, or AIFMD. That puts them in a separate supervisory track, with the fund manager authorized in its home member state and passporting rights across the EU.

The practical effect is that a U.S. issuer can offer BUIDL into Europe only by complying with AIFMD or by structuring an EU-domiciled feeder. Stablecoin issuers, by contrast, can obtain a single e-money license and passport across the bloc. The two products are again treated differently, this time because the EU decided that a tokenized fund is a fund, while a payment stablecoin is a payment instrument.

What this means for the reader

For a professional allocating capital, the regulatory split is not a footnote. It dictates who you can onboard, how you custody, where you can trade, and what disclosure you get. A tokenized T-bill product comes with a PPM, audited financials, a named custodian, and a clear legal opinion on its securities status. A stablecoin comes with attestations, a reserve report, and a legal opinion that varies in quality by issuer.

If you are using the token as collateral inside DeFi, the differences are sharper. A tokenized Treasury token can only be used in markets that have been onboarded onto the allowlist, which limits composability. A stablecoin can be used anywhere, but exposes the user to issuer risk, banking risk, and jurisdictional risk. Most sophisticated desks now hold both, and treat them as different instruments entirely, not as substitutes.

The structural template that BUIDL introduced (a Cayman or Delaware SPV, a 40 Act fund wrapper, a traditional custodian, a permissioned chain, an allowlist) is now the default copy-paste structure for new entrants such as OUSG, USYC, and USDY. Reading the prospectus of any of them against BUIDL will show how thin the differences really are. That is the giveaway: when every product is built from the same parts, the legal wrapper is the product.

How to follow tokenized money markets without losing the plot

Tokenized money markets and stablecoin policy are moving on parallel tracks, and both are moving fast. Tracking the structural shifts, the regulator commentary, and the issuer disclosures manually is a losing game. Zippfeed surfaces tokenized Treasury and stablecoin headlines with sentiment scoring (bullish, neutral, or bearish) and an importance rating, so you can see which regulatory moves actually matter and which are noise.