The founder of Natural argues that the total addressable market for agentic payments isn't just a replacement for Stripe (a Payment Service Provider). It encompasses the functions of a bank (storing balances), a PSP (processing transactions), and a network (like Visa), creating a fundamentally new, all-in-one infrastructure layer.

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.

The acquisition's goal is to combine Stripe's merchants, PayPal's consumer accounts, and Block's point-of-sale infrastructure. This creates an end-to-end payment network that can bypass traditional credit card rails, establishing a formidable new competitor to the Visa and Mastercard duopoly.

In 1958, Bank of America jumpstarted what became the Visa network by mailing 60,000 live credit cards to Fresno residents. This aggressive, and now illegal, tactic instantly created a user base and merchant incentive, solving the classic two-sided market problem that plagues new payment platforms.

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.

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.

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.