# Integrating Staking

You can build apps on top of Sonic's staking system, such as liquid staking tokens or vaults. All staking operations are managed by the SFC (Special Fee Contract).

* **SFC Address:**\
  `0xFC00FACE00000000000000000000000000000000`
* **Key Functions:**
  * `delegate(validatorID)`: Delegate stake to a validator.
  * `undelegate(validatorID, wrID, amount)`: Begin the withdrawal process.
  * `withdraw(validatorID, wrID)`: Claim unlocked stake after the withdrawal period.
  * `pendingRewards(delegator, validatorID)`: Check claimable rewards.
  * `claimRewards(validatorID)`: Claim pending rewards.
* **Constants**\
  Economic parameters like withdrawal period and reward rates are available by calling the `constsAddress()` on the SFC to get the `ConstantsManager` contract address.
* See the [API & SDK Reference](https://www.notion.so/New-Proposed-Sonic-Documentation-20d178962bd280279aeceae1832ee8c2?pvs=21) for the full SFC ABI.


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