Stablecoins spent years as instruments of crypto-native speculation, used primarily for trading pair liquidity and yield farming. In Q4 2025, three developments moved them into the payments mainstream: the GENIUS Act established the first comprehensive U.S. regulatory framework for stablecoin issuance, Stripe launched an open platform enabling any business to issue its own stablecoin, and PayPal’s PYUSD grew to 3.6 billion dollars in circulation. Together, these developments represent the clearest signal yet that stablecoins are transitioning from financial instruments to payment infrastructure.
The GENIUS Act: Regulatory Clarity Arrives
The Guiding and Establishing National Innovation for U.S. Stablecoins (GENIUS) Act became law on July 17, 2025, creating the first comprehensive federal framework governing stablecoin issuance in the United States. The legislation defines a “payment stablecoin” as a token redeemable at a fixed value and used for payments or settlements. It sets federal standards for who can issue these instruments, how reserves must be managed, and what disclosures and audits are required.
The act requires one-to-one reserve backing with high-quality, liquid assets. It prohibits any entity other than a permitted payment stablecoin issuer from issuing a payment stablecoin in the United States, and restricts digital asset service providers from offering stablecoins to U.S. persons unless the issuer meets the act’s requirements. Foreign issuers must meet equivalent standards to access U.S. markets.
For the payments industry, the GENIUS Act resolved the primary barrier to institutional stablecoin adoption: regulatory uncertainty. Banks, payment networks, and fintech companies that had been cautious about stablecoin integration now had a clear legal framework within which to operate. The act’s effective date is the earlier of 18 months after enactment or 120 days after regulators issue final implementing rules.
Stripe Open Issuance: Stablecoins as a Platform Feature
On September 30, 2025, at Stripe Tour New York, the company announced Open Issuance, a platform enabling businesses to launch and manage custom stablecoins with minimal code. The product, powered by Bridge (which Stripe acquired in early 2025), transforms stablecoin creation from a complex financial engineering project into a platform feature accessible through a standard API integration.
Open Issuance offers customizable reserves, free minting and burning, and interoperability across all coins issued on the platform. Reserve management partners include BlackRock, Fidelity Investments, and Superstate, with Lead Bank providing liquidity. The first stablecoin created on the platform was CASH by Phantom, with MetaMask’s mUSD and Hyperliquid’s USDH announced as forthcoming.
Will Gaybrick, Stripe’s President of Technology and Business, stated: “Across stablecoins and AI, Stripe’s role is to pull frontier technology out of the experimental and into the mainstream.” The positioning is deliberate: Stripe is applying the same infrastructure abstraction approach to stablecoins that it applied to card payments a decade earlier.
Stripe also announced that its Optimized Checkout Suite now accepts stablecoin payments by default, and that U.S. businesses can hold stablecoin balances, convert between currencies, spend via locally-issued cards, and send cross-border payments using stablecoins. This makes stablecoins a native part of Stripe’s payment stack rather than an add-on integration.
PayPal PYUSD: From Experiment to Scale
PayPal’s stablecoin, PYUSD, demonstrated the commercial viability of payment-oriented stablecoins with dramatic growth in 2025. The total amount of PYUSD in circulation grew approximately 600 percent to 3.6 billion dollars over the course of the year. Transaction volume powered by the stablecoin increased 150 percent to 1.8 million transactions.
The growth was driven in part by network expansion. Following major expansions in September 2025, PYUSD now operates across 13 blockchain networks including Abstract, Aptos, Avalanche, Ink, Sei, Tron, and Berachain, connected through LayerZero’s cross-chain integration. PayPal Ventures also invested in Stable’s 28 million dollar seed round, enabling PYUSD integration into Stablechain, a Layer 1 network designed specifically for stablecoin transactions.
PayPal CEO Alex Chriss has been public about the company’s blockchain strategy, telling Fortune in December 2025 that integrating blockchain solutions across the 56 billion dollar payment company is essential for PayPal to “reinvent itself to stay relevant.” The stablecoin is not a side project; it is central to PayPal’s infrastructure evolution.
Why Payments Companies Are Building on Stablecoins
The converging moves by Stripe, PayPal, and the U.S. government reflect a shared economic logic. Stablecoins offer near-instant settlement, 24/7 availability, programmability, and dramatically lower cross-border transfer costs compared to traditional payment rails. For payment companies processing trillions in annual volume, even fractional improvements in settlement speed and cost translate to significant economic value.
The GENIUS Act’s requirement for high-quality reserve backing effectively means that compliant stablecoins are full-reserve instruments backed by U.S. Treasuries and equivalent assets. This makes them structurally similar to money market funds with instant redemption, a product category that has operated successfully within the existing financial system for decades. The regulatory framework imports that proven structure into the digital asset space.
For merchants, the appeal is concrete. Stablecoin transactions avoid interchange fees entirely. Cross-border payments that cost 3 to 5 percent through card networks cost fractions of a cent on blockchain rails. Settlement that takes 2 to 3 business days through traditional channels occurs in seconds on stablecoin infrastructure.
Implications for Traditional Payment Networks
Visa and Mastercard have both signaled interest in stablecoin infrastructure as a complement to rather than a replacement for their existing networks. Both companies expanded stablecoin capabilities in their Q4 2025 earnings periods, positioning themselves as bridges between traditional card payments and stablecoin-based settlement.
The strategic question for incumbent networks is whether stablecoins will primarily flow through their existing rails (using their networks for authorization and settlement of stablecoin-denominated transactions) or bypass them entirely (with merchants and consumers transacting directly on blockchain infrastructure). The GENIUS Act’s regulatory requirements favor the first scenario by imposing compliance obligations that established financial institutions can meet more readily than crypto-native entities.
What Comes Next
The regulatory, infrastructure, and commercial pieces of the stablecoin payments ecosystem are now in place. The GENIUS Act provides legal clarity. Stripe provides issuance and acceptance infrastructure. PayPal demonstrates consumer-scale adoption. The next phase will determine whether stablecoins become a significant share of total payment volume or remain a niche channel for specific use cases (cross-border B2B, gig economy payouts, remittances).
The pace of adoption in 2025 suggests the mainstream scenario is more likely. When the world’s largest payment companies are building stablecoin infrastructure as core product features rather than experimental add-ons, the instruments have crossed the threshold from financial innovation to payment utility. Readers interested in how agentic commerce infrastructure intersects with these stablecoin rails can find related analysis in our December coverage.
Related: Stablecoins Are Quietly Becoming Payment Infrastructure | Visa Expands Stablecoin Settlement to Nine Blockchains
