The current reward rate for staking on Sifchain is around 70% per annum.
Rewards are currently mainly derived from inflation, but you can also expect to earn a share of the fees that will be paid out on the network. Currently these fees are not live yet, but as soon as they are, they will be reflected in the reward rate.
Inflation will slow down over time and therefore rewards will also reduce unless the rewards brought in through fees grow at a faster rate than the inflation reduces.
Your reward is also affected by the amount of tokens that are staked. Currently, 19.5% of tokens are staked, and if this percentage doubles, your realized rewards will be half.
