What affects the reward size (APY)?
Tonstakers displays rewards as a historical APY – the average annual yield over the past 30 days.
The staking APY may vary depending on several factors: the block reward set by the network, the number of transactions in the network, the number of blocks created, the number of active validators, the total amount of TON in staking, and more.
TON staking APY chart is available on Tontech.