What does ‘monthly accrual’ mean?

Monthly accrual refers to the maximum amount of additional Twism Coins you will earn while staking. The return you get from staking is based on your tier level.

For example, let's say you currently hold 250 Twism Coins which puts you under the Bronze tier. In this tier, your monthly accrual is set for up to 0.3%. This means that after one month of staking, you will receive an additional 0.75 Twism Coins (0.3%) in the case you get the maximum reward.