🕊️Kusama SRB

Kusama Staking Rewards Benchmark (KSMSRB™) Methodology

KSMSRB is a benchmark representing the annualized staking rate for the KSM token.

KSMSRB is calculated and published by Staking Rewards via the Kusama Profile and Staking Data API.

KSM Staking Rewards Rate: KSMSRB

$$KSMSRB = ap * (1 - sf) + af * (1 - tf) / price$$

Formula Key	Metric Name	Description
ap	Annual Provisions	The total amount of tokens emitted per year.
sf	System Fees	The system fee applied to all emitted tokens.
af	Annualized Fees	The annualized fees from the last 30 days.
tf	Transaction Fees	The average transaction fees for the last 30 days.
price	Token Price	The current token price.

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KSM Validator Staking Rewards Rate: KSMSRB(v)

Staking Rewards calculates the KSMSRB for each validator based on their individual era points accumulated, performance, and commission rate.

$$KSMSRB(v) = (vep / tep * tvr) / t_m * t_y / vst$$

Formula key	Metric Name	Description
$vep$	Validator Era Points	Validator era points accumulated in the last 30 days.
tep	Total Era Points	Total era points for all validators for the last 30 days.
tvr	Total Validator Rewards	All rewards distributed to all validators for the last 30 days.
vst	Validator Staked Tokens	Validator staked tokens, self-staked and delegated.
$t_y$	Year Constant	365d
$t_m$	Month Constant	30d

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KSM Real Reward Rate: KSMSRB^R

The real reward rate calculates the reward rate adjusted for inflation in the network.

$$KSMSRB^R = 1+KSMSRB/(1+ir)-1$$

Formula key	Metric name	Description
ir	Inflation Rate	Total tokens added to the circulating supply in the last 365 days.

Inflation Rate Behavior

• KSM has a 10% annual inflation rate, dynamically split between staking rewards and the treasury based on the staking rate. The network targets an ideal staking rate (around 60%), adjusting incentives to maintain balance. If staking is below this rate, rewards increase; if above, more funds go to the treasury. This model supports security, liquidity, and network growth, with inflation parameters adjustable via on-chain governance.

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Data Sources:

• Subscan

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References:

• Polkadot Staking Docs

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Last updated on 02/25/2025