# Starknet SRB

STRKSRB is a benchmark representing the mean, annualized staking rate across all active Starknet validators.

STRKSRB is calculated and published by Staking Rewards via the [Starknet Profile](https://www.stakingrewards.com/asset/starknet) and [Data API](https://www.stakingrewards.com/data-api).

> **TL;DR:** Starknet staking rewards follow a formula where the rate equals 10 times the max inflation percentage divided by the square root of the staking ratio (staked tokens / total supply). The rate decreases as more tokens are staked.

### STRK Staking Rewards Rate: STRKSRB

$$
STRKSRB = (10\*mip) / \sqrt{(st/ts)}
$$

<table><thead><tr><th width="149">Formula key</th><th width="180">Metric name</th><th>Description</th></tr></thead><tbody><tr><td>mip</td><td>Max Inflation Percentage</td><td>The maximum theoretical inflation percentage.</td></tr><tr><td>st</td><td>Staked Tokens</td><td>The total tokens staked including tokens staked by validators and delegated by delegators.</td></tr><tr><td>ts</td><td>Total Supply</td><td>The total STRK token supply.</td></tr></tbody></table>

#### Slashing

* STRKSRB does not factor in the possibility of slashing occurrences.
* It's important to note that if validator entities face slashing, rewards will increase, as the slashed tokens are reallocated among validators.

***

### STRK Validator Staking Reward Rate: STRKSRB(v)

Staking Rewards calculates the STRKSRB for each validator based on their individual commission.

$$
STRKSRB(v) = STRKSRB \*(1-cr)
$$

<table><thead><tr><th width="142">Formula key</th><th width="208">Metric name</th><th>Description</th></tr></thead><tbody><tr><td>cr</td><td>Commission Rate</td><td>The percentage commission rate the validator has set as a delegation fee for all delegators.</td></tr></tbody></table>

***

#### Observation Period:

* The STRKSRB is determined based on the latest generated block at the point of evaluation.
* This data is then annualized for a comprehensive year-long projection.

#### Calculation

The calculation happens every 1o minutes and is immediately published via [Data API](https://www.stakingrewards.com/data-api).

#### Limitations

* STRKSRB excludes rewards accrued from on-chain fees.
* STRKSRB employs a 365-day convention for annualizing current slot times. This convention remains consistent and does not accommodate adjustments for leap years.

***

### STRK Real Reward Rate: STRKSRB^R

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

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

<table><thead><tr><th width="140">Formula key</th><th width="144">Metric name</th><th>Description</th></tr></thead><tbody><tr><td>ir</td><td>Inflation Rate</td><td>The annual provisions divided by the circulating supply.</td></tr></tbody></table>

**Inflation Rate Behavior**

* Starknet's inflation mechanism caps annual inflation at 4%, with a minting rate proportional to the square root of the staking rate—ensuring that the more tokens are staked, the higher the total minting but the lower individual staking rewards as a percentage. The minting curve aims to strike a balance between the needs of rewarding stakers and setting inflation expectations on Starknet.

***

### Other Starknet metrics calculated by Staking Rewards:

<table><thead><tr><th width="190">Metric</th><th>Description</th></tr></thead><tbody><tr><td>Delegated Tokens</td><td>The number of STRK tokens delegated to validators.</td></tr><tr><td>Self Staked Tokens</td><td>The number of STRK tokens self-staked by validators directly.</td></tr><tr><td>Staking Wallets</td><td>The total number of unique delegations on-chain.</td></tr></tbody></table>

***

### BTC Staking on Starknet

Starknet operates a dual-token consensus model where both STRK and BTC contribute to network security. BTC holders stake tokenized BTC wrappers (WBTC, tBTC, SolvBTC, LBTC) on Starknet to earn STRK rewards.

BTC staking uses the same validators as STRK staking. Each validator can open delegation pools for BTC wrapper tokens via the staking contract. Reward options are tracked per validator and per wrapper.

#### BTC Staking Reward Rate

$$
APR\_{BTC} = (ym \* \alpha \* P\_{STRK}) / (st\_{BTC} \* P\_{BTC})
$$

<table><thead><tr><th width="149">Formula key</th><th width="180">Metric name</th><th>Description</th></tr></thead><tbody><tr><td>ym</td><td>Yearly Mint</td><td>Total STRK minted per year from the minting curve contract.</td></tr><tr><td>α</td><td>Alpha</td><td>BTC weight factor in consensus (currently 25%), sourced from the reward supplier contract.</td></tr><tr><td>P_STRK</td><td>STRK Price</td><td>Current STRK price in USD.</td></tr><tr><td>st_BTC</td><td>Total BTC Staked</td><td>Sum of all BTC wrapper tokens staked across WBTC, tBTC, SolvBTC, and LBTC.</td></tr><tr><td>P_BTC</td><td>BTC Price</td><td>Current BTC price in USD.</td></tr></tbody></table>

* BTC stakers earn STRK rewards, not BTC. The effective APR depends on the STRK/BTC price ratio.
* The alpha parameter (BTC weight) is controlled on-chain and can be adjusted by governance.

#### BTC Validator Staking Reward Rate: APR\_BTC(v)

$$
APR\_{BTC}(v) = APR\_{BTC} \* (1 - cr)
$$

<table><thead><tr><th width="142">Formula key</th><th width="208">Metric name</th><th>Description</th></tr></thead><tbody><tr><td>cr</td><td>Commission Rate</td><td>The validator's commission rate, same as for STRK staking.</td></tr></tbody></table>

* Each validator's BTC delegation pools are discovered via the `staker_pool_info` contract function.
* A separate reward option is created per validator per BTC wrapper token.
* Validators with 100% commission (private validators) are excluded.

#### Supported BTC Wrappers

<table><thead><tr><th width="140">Token</th><th width="100">Decimals</th><th>Description</th></tr></thead><tbody><tr><td>WBTC</td><td>8</td><td>Wrapped Bitcoin (bridged)</td></tr><tr><td>tBTC</td><td>18</td><td>Threshold Bitcoin (decentralized bridge)</td></tr><tr><td>SolvBTC</td><td>18</td><td>Solv Protocol BTC</td></tr><tr><td>LBTC</td><td>8</td><td>Lombard Staked Bitcoin (backed by Babylon BTC staking)</td></tr></tbody></table>

***

#### Data Sources:

* Starknet Blockchain RPC Endpoints (staking contract, minting curve, reward supplier)
* CoinGecko for BTC and STRK price data

***

#### References:

* [Starknet Staking Overview](https://docs.starknet.io/staking/overview/)
* [Bitcoin Staking on Starknet User Guide](https://www.starknet.io/staking/bitcoin-staking-user-guide-for-starknet/)
* [Starknet Staking Contract Spec](https://github.com/starkware-libs/starknet-staking/blob/main/docs/spec.md)

***

:books:[ Learn more about STRK Staking](https://www.stakingrewards.com/asset/starknet)

:gear: [Access historic Starknet Staking Data via API](https://www.stakingrewards.com/data-api)

```
Last updated on 03/18/2026
```


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