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The ratio of staked assets to minted stTokens.
At genesis, stEVMOS can redeemed for EVMOS 1:1. But as staking rewards accrue to stEVMOS, it will gradually become worth more EVMOS.
ex) After 1 year with 20% APY At genesis 1stEVMOS 1 EVMOS exchange rate But 1 year after exchange rate will be 0.8 stEVMOS : 1 EVMOS