Visa's moat is threatened less by traditional competitors and more by sovereign payment systems. Government-backed networks like India's UPI and Brazil's Pix facilitate direct bank-to-bank transfers, bypassing Visa's rails. In China, state control and super apps like Alipay have effectively blocked Visa from the market.

To counter the rise of free, government-backed account-to-account (A2A) payment systems, Visa is building its own A2A network. It then monetizes these flows by adding value-added services like real-time fraud detection and global interoperability—features that basic, local bank-transfer systems cannot match, turning a commodity threat into a premium offering.

Major tech and fintech players, including Apple, Google, and Stripe, have opted to integrate with Visa's network rather than build a competing one from scratch. This dynamic turns potential disruptors into partners, reinforcing Visa's deep moat and demonstrating the prohibitively high cost of replicating its global infrastructure.

Rather than engaging in destructive price wars, Visa and Mastercard prioritize maintaining high industry margins. Their primary competitive focus is on converting the world's $11 trillion in cash and check transactions to digital, effectively expanding the entire market for both players instead of fighting over existing share.

Platforms like ChatGPT achieve global scale in years, not decades. This speed means relying on a single payment service provider (PSP) is no longer viable. Companies now need a multi-PSP strategy to optimize routing and maintain leverage, creating a market for orchestrators like Basis Theory.

Amex's "closed-loop" model intentionally targets affluent consumers, using high merchant fees to fund premium rewards. This creates a virtuous cycle, positioning Amex as a status symbol for high spenders. This contrasts sharply with Visa's "open-loop" system, which scales as a low-cost, high-volume utility for the global mass market.

For SaaS businesses that process payments, adding a fee based on Gross Merchant Value (GMV) is a powerful revenue driver. This revenue tends to grow more smoothly and predictably over time compared to spiky usage-based fees (e.g., per SMS), making it more valuable to acquirers.

For global operators, the core complexity of international payments lies in the final "on-ramp and off-ramp" to local fiat currencies, not the underlying transfer rails. The real customer value comes from minimizing foreign exchange (FX) fees by keeping revenue and expenses within the same local currency.

The system of charging retailers an interchange fee (around 1.8%) that is then passed to consumers as rewards (around 1.57%) creates a strong network effect. Consumers are incentivized to use rewards cards, and retailers cannot easily offer discounts for other payment methods, locking both parties into the ecosystem.