BlockRiver Blog | Stablecoin Settlement Goes Live: PSPs Without Multi-Rail Capability Face Corporate Client Defection

The numbers no longer describe a pilot. In 2025, stablecoin transaction volume reached $33 trillion, up 72% year-over-year, with B2B payments representing the fastest-growing segment at 733% annual growth. While the gross volume includes trading and protocol-level activity, McKinsey and Artemis Analytics estimate that genuine stablecoin payments, vendor settlements, payroll, remittances, now total approximately $390 billion annually. That figure doubled from the prior year. For payment service providers serving corporate clients with cross-border needs, the question is no longer whether stablecoins matter. It's whether your infrastructure can support them before your clients find someone else's that can.

The regulatory fog has cleared. In July 2025, the United States enacted the GENIUS Act, establishing a federal framework for payment stablecoins that clarifies reserve requirements, issuer oversight, and the operational boundaries for financial institutions. In Europe, MiCA's stablecoin provisions have been in force since mid-2024, requiring Electronic Money Token issuers to hold EMI or credit institution licences and maintain fully liquid, segregated reserves. Hong Kong passed its Stablecoin Ordinance in May 2025. These are not aspirational standards. They are operating requirements, and they define who can legally offer stablecoin settlement in the world's largest payment corridors.

Major infrastructure providers have responded accordingly. Stripe completed its $1.1 billion acquisition of Bridge in early 2025 and is now integrating stablecoin-linked card and settlement products across more than 70 countries. Visa has expanded its stablecoin settlement capabilities, allowing select issuers and acquirers to settle obligations in USDC rather than through traditional banking rails. Fiserv launched an interoperable stablecoin designed to connect with PYUSD and USDC for institutional money movement. These are not announcements. They are production deployments.

For PSPs and EMIs operating on fiat-only infrastructure, this creates an acute competitive problem. Corporate treasury teams are already selecting providers based on settlement optionality. The appeal is structural: stablecoins settle in minutes, operate continuously, and bypass correspondent banking delays that can stretch multi-day for complex corridors. In regions where local banking access is constrained or FX costs erode margins. Latin America, Southeast Asia, parts of Africa, stablecoin rails offer a cost and speed advantage that traditional infrastructure cannot match.

B2B payments are the centre of gravity. According to McKinsey, business-to-business stablecoin payments now account for approximately $226 billion annually, representing roughly 60% of genuine stablecoin payment volume. Early adopters are using stablecoins for supplier payments, intercompany transfers, and cross-border liquidity management. The use case is not theoretical. It is being executed by treasury teams at companies ranging from SpaceX to multinationals managing contractor payouts in 70+ countries through Stripe's Remote.com integration.

This creates a specific risk for PSPs still treating stablecoin capability as a future-state initiative. The market has moved from "should we?" to "how fast can you?" while many providers remain in pilot purgatory. An 18-month infrastructure roadmap is not a timeline. It is a client attrition schedule. Corporate clients with cross-border needs are not waiting for legacy providers to modernise incrementally. They are evaluating providers based on whether settlement rails can support 24/7 finality, multi-currency flexibility, and programmable settlement logic, today.

The operational reality is harder than the strategy deck suggests. Integrating stablecoin rails requires custody infrastructure, compliance workflows for AML and Travel Rule obligations, on-ramp and off-ramp connectivity, and accounting treatment that most legacy systems were not designed to accommodate. Patching existing rails will not close a structural competitiveness gap. Providers who attempt to bolt stablecoin capability onto fiat-first architecture will likely find themselves operating two parallel systems, incurring the cost of both while delivering the benefits of neither.

The regulatory frameworks now in place. GENIUS in the US, MiCA in Europe, stablecoin ordinances in Hong Kong and Singapore, have lowered the barrier to institutional participation. But they have also raised the bar for compliance. EMIs offering stablecoin payment services in the EU face a choice between dual authorisation under PSD2 and MiCA or partnering with a licensed PSP. The European Banking Authority has advised national competent authorities to ensure CASPs providing EMT payment services hold PSP licences or enter compliant partnerships by March 2026. That window is closing.

The competitive pressure is asymmetric. Crypto-native infrastructure providers and well-capitalised fintechs can deploy stablecoin settlement as a primary rail. Legacy PSPs must retrofit existing systems while maintaining continuity for clients still operating on traditional rails. The cost of doing nothing is client defection. The cost of doing it poorly is operational fragmentation. Neither is recoverable at scale.

For heads of product and CTOs at mid-to-large EMIs, the question is not whether stablecoin settlement is relevant. It is whether your current roadmap accounts for the pace at which your largest clients are already making decisions. The clients moving treasury flows to competitors offering stablecoin settlement are not making speculative bets. They are responding to a structural shift in what payment infrastructure can deliver, and they are not waiting for you to catch up.