The Stellar distributed network has a built-in, fixed, nominal inflation mechanism. New lumens are added to the network at the rate of 1% each year. Each week, the protocol distributes these lumens to any account that gets over .05% of the “votes” from other accounts in the network.
Inflation explained: Stellar.org
You cannot earn inflation on an exchange. Stronghold does not enable our customers to participate in the inflation pool. If they would like to participate they must move their XLM to a Stellar wallet, capable of joining an inflation pool.