The Monad testnet reveals a highly concentrated and dynamic ecosystem with significant user engagement variability. The top 100k users demonstrate robust network participation, executing 23,690,159 total transactions and interacting with an average of 32,734 unique contracts. However, user retention is challenging, with 284,254,055 addresses active for just one week and only 139,122 addresses remaining active beyond 10 weeks. The network shows a pyramidal structure where a small fraction of power users drive substantial activity, with most addresses performing minimal transactions and only 93,050 addresses executing more than 1,000 transactions.