Grokking the System Design Interview, Volume II
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Step 3: Capacity Estimation

By the standards of this course, the numbers here are small. What makes a payment system hard is that every one of them must be exactly right.

Merchants and load. More than 100,000 merchants use the platform. The system must sustain 2,000 TPS and absorb peaks of 5,000 TPS during major sales.

Average versus capacity. Assume the platform handles about 1 billion transactions a year today. Spread over the year, that is only about 32 a second, so the 2,000 TPS target is not the average. It is the capacity the system must keep available for busy hours, seasonal peaks, and growth.

**Storage

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