PayPal, M0, and MoonPay have launched PYUSDx, a new platform designed to allow businesses to issue their own application-specific stablecoins without building the underlying reserve, custody, and redemption infrastructure themselves.
The platform went live on September 9, with three issuers—Saturn, Concrete, and Cap—already participating at launch. According to the companies, the three platforms have collectively processed more than $100 million. Additional issuers, including USD.AI and Fairblock, are expected to join the ecosystem.
The launch represents a different approach to stablecoins. Instead of forcing businesses to build their own financial infrastructure from the ground up, PYUSDx separates the product experience from the monetary infrastructure supporting it.
However, the structure also raises an interesting regulatory question as the United States continues developing rules for payment stablecoins.
How PYUSDx Works
The PYUSDx system uses a two-layer structure.
At the first layer is PayPal USD (PYUSD), which is issued by Paxos Trust Company. Paxos operates as a federally regulated national banking association, and PYUSD is backed by assets such as dollar deposits and U.S. Treasuries.
The second layer consists of PYUSDx tokens. These tokens are issued by MoonPay Digital Assets Limited and are backed by PYUSD.
In simple terms, PYUSD is backed by traditional reserve assets, while PYUSDx is backed by PYUSD itself.
That distinction is important because the PYUSDx tokens are not PayPal or Paxos products. They also cannot be sent, received, or used directly inside PayPal or Venmo.
The model effectively creates a stablecoin infrastructure where one stablecoin becomes the reserve asset for another token issued by a separate entity.
Why Businesses May Want This Model
Creating a stablecoin normally requires much more than simply deploying a token contract. Issuers need reserve management, custody arrangements, compliance systems, redemption infrastructure, liquidity, and other financial services.
PYUSDx attempts to remove much of that complexity.
M0 provides the infrastructure that allows businesses to configure different elements of their stablecoins. Issuers can customize features such as the token name, access restrictions, reward distribution, collateral policies, and cross-chain availability.
This allows businesses to focus more heavily on the application they are building instead of spending resources developing the monetary infrastructure behind it.
MoonPay Digital Assets Limited serves another important role in the structure. It issues the PYUSDx-layer tokens and holds the PYUSD that serves as their backing. MoonPay also provides onboarding and distribution capabilities.
The companies behind PYUSDx argue that this separation allows the product layer to belong to the business building the application, while the underlying monetary infrastructure can be handled by specialized companies.
The Regulatory Question
While the model offers an interesting business structure, it also creates an important question under the GENIUS Act.
The GENIUS Act, signed into law in July 2025, establishes a regulatory framework for payment stablecoins in the United States. Among other requirements, permitted issuers are expected to maintain one-to-one backing using specified high-quality liquid assets, including cash, insured deposits, short-term U.S. Treasuries, certain Treasury-backed repurchase agreements, and qualifying money market funds.
But PYUSDx introduces a slightly different structure.
Instead of directly backing the second token with dollars, Treasury securities, or another qualifying traditional reserve asset, PYUSDx tokens are backed by PYUSD, which itself is backed by traditional reserve assets.
That creates a layered structure:
Dollar deposits and Treasuries → PYUSD → PYUSDx
The GENIUS Act clearly establishes requirements for payment stablecoin issuers and their reserves, but the specific treatment of a stablecoin backed by another stablecoin issued by a different entity is less obvious.
This does not automatically mean PYUSDx violates the law. Rather, it highlights an area where regulators may need to provide additional clarification as stablecoin infrastructure becomes more sophisticated.
A New Direction for Stablecoin Infrastructure
The PYUSDx launch demonstrates how stablecoins are evolving beyond simple dollar-pegged tokens.
Businesses increasingly want application-specific digital currencies that can be integrated into payments, financial applications, rewards programs, trading platforms, and other products. Building the entire financial infrastructure required to operate such a token, however, can be expensive and complicated.
PYUSDx attempts to solve that problem by allowing businesses to create branded stablecoins while relying on established infrastructure providers for issuance and backing.
The approach could make customized stablecoins easier to launch and potentially accelerate adoption across different applications.
At the same time, the structure shows why stablecoin regulation is becoming increasingly important. As multiple layers of tokens, issuers, custodians, and reserve assets interact, regulators will need to determine exactly where existing rules apply and who carries responsibility for each layer.
For now, PYUSDx represents an interesting experiment in stablecoin architecture. The key question is no longer simply whether a token is backed by dollars. It is also what backs the asset backing the token, who issues each layer, and which regulatory framework applies to the entire structure.
As the U.S. continues turning the GENIUS Act into detailed regulations, PYUSDx could become an important example of the new stablecoin structures regulators will have to consider.
