Payments Lack Network Effects
Stripe
Payments is a scale business, not a network effects business. Adding one more merchant to Stripe does not make Stripe materially more valuable to the next merchant in the way adding one more buyer helps a marketplace. What matters more is software, local payment method coverage, sales reach, and authorization performance, which is why merchants often run multiple processors and why regional specialists like Adyen and Checkout.com can keep winning meaningful share beside Stripe.
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A merchant can switch processors or split volume across several of them without losing its customers. Large global companies often use Stripe in one region and another PSP locally, or use an orchestration layer like Primer to route across Stripe, Adyen, and others.
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The durable moat is usually operational and product based. Adyen built early strength in Europe by supporting local payment methods and cross-border flows, while Checkout.com won enterprise accounts with heavier sales and custom setups, not because either had a self reinforcing user network.
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That is also why Stripe keeps moving up the stack into billing, metering, lending, and fraud. Payments alone tends toward price pressure, so the goal is to become harder to rip out by owning more of the workflow around the transaction.
The next phase of competition should look even more modular. Core payment acceptance will remain crowded by geography and segment, while more value pools shift into the software layers attached to payments. The winners are likely to be the processors that turn a low moat rail into a sticky operating system for revenue, money movement, and financial operations.