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APY
How the APY (Annual Percentage Yield) is calculated
The Staking Annual Percentage Yield (APY) is the projected rate of annual return obtained by the token holders while staking tokens. Staking rewards in Solana compound with each epoch automatically.
Eversol Stake Pool uses the standard Solana program for calculating the APY (with some exceptions, see below).
Release SPL Stake Pool and CLI - v0.6.1 Β· solana-labs/solana-program-library
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Stake Pool's APY

APY is calculated using such values as the number of epochs per year, the value of minted tokens for the past epoch, and the total number of SOL in the pool, to calculate the price of the token in the current epoch according to the formula (see below), as well as the same for data for this epoch.
APY – Annual Percentage Yield;
EpochsPerYear – the number of epochs per year;
tl – total lamports;
ts – total supply;
ltl – last epoch total lamports;
lts – last epoch total supply;
avgSlotTime - average closing time of one slot (~530ms).
Exception (Marinade):

Validator's APY

Validator's APY is calculated using the amount of remuneration, the amount of the balance before receiving remuneration, as well as the number of epochs per year according to the formula below:
APY – Annual Percentage Yield;
EpochsPerYear – the number of epochs per year;
tl – total lamports;
ts – total supply;
ltl – last epoch total lamports;
lts – last epoch total supply.
avgSlotTime - average closing time of one slot (~530ms).