Stablecoin Flow: The $33T Payment Rail Race

The scale of stablecoin adoption is now a direct challenge to legacy payment rails. In 2025, global stablecoin transaction value hit $33 trillion, a 72% year-over-year increase. That volume now exceeds Visa's annual throughput of $13 trillion, establishing stablecoins as a primary payment infrastructure.

This growth solves core pain points in cross-border finance. Transactions that once took days now settle in seconds, while average costs have fallen from 6.5% to below 1%. This efficiency is driving enterprise adoption for treasury management, payroll, and e-commerce, moving beyond crypto speculation into real business operations.

Market dominance is concentrated, with USDC and USDT together accounting for over 95% of total transaction volume. Circle's USDC led with $18.3 trillion in flows, while Tether's USDT recorded $13.3 trillion, cementing their position as the digital dollars of choice for moving value at scale.

The Competitive Race: USDC vs. USDT vs. New Entrants

The flow volume split between the market leaders is stark. In 2025, Circle's USDC processed $18.3 trillion worth of transactions, while Tether's USDT recorded $13.3 trillion. This establishes USDC as the dominant payment rail by transaction flow, even as USDT retains the lead in market capitalization.

Utility is concentrated in high-volume enterprise use. McKinsey's analysis shows that stablecoin payment volume reached $390 billion annually in December 2025, with B2B payments accounting for $226 billion and card-linked spending reaching $4.5 billion. This breakdown reveals where the real liquidity is moving-between businesses and through consumer spending tools-rather than speculative trading.

New institutional entrants are testing the waters, signaling a shift toward regulated infrastructure. PayPal has launched its PYUSD stablecoin on the Stellar network, while U.S. Bank has begun testing its own stablecoin on Stellar. These moves by major financial players indicate a race to establish the foundational rails for institutional adoption, with network choice becoming a critical battleground.

The Infrastructure Battle: On-Ramps and Scalability

The race for transaction flow is won by the network with the deepest on-ramps. Stellar's Anchor Platform has become the critical infrastructure, with over 475,000 on-ramps connecting users to stablecoins. This vast ecosystem of payment service providers, exchanges, and wallets is the primary reason Circle's USDC leads in transaction volume, as it provides the easiest path for money to enter and exit the network.

Regulatory clarity is now the catalyst for a new wave of competition. The GENIUS Act, enacted in July 2025, creates a path for nonbank firms to issue stablecoins and compete for payment services. This legislation, coupled with the Federal Reserve's proposal for limited payment accounts, aims to level the playing field and ensure a safe, efficient system.

The critical next step is implementation. The safety and scalability of this new payment infrastructure will be defined by how regulators write the rules for the GENIUS Act and how quickly the Federal Reserve's limited accounts become operational. This will determine whether the current flow dominance of USDC on Stellar can be challenged, or if the existing rails will solidify.