# Hub The Hub contract acts as the central hub for all minted stSei. Native Sei tokens received from users are delegated from here, and undelegations from stSei unbond requests are also handled from this contract. Rewards generated from delegations are withdrawn to the Reward contract, later restaking to validators, and update exchange rate. ## Config

Key	Type	Description
creator	CanonicalAddr	Address of contract creator
update_reward_index_addr	CanonicalAddr	The address allowed to call UpdateGlobalIndex
reward_dispatcher_contract	Option<CanonicalAddr>	Contract address of Rewards Dispatcher
validators_registry_contract	Option<CanonicalAddr>	Contract address of Validators Registry
bsei_token_contract	Option<CanonicalAddr>	Contract address of bSei's Cw20 token contract
stsei_token_contract	Option<CanonicalAddr>	Contract address of stSei's Cw20 token contract
rewards_contract	Option<CanonicalAddr>	Contract address of Reward

## ## Parameters

Key	Type	Description
epoch_period	u64	Minimum time delay between undelegation batches [seconds]
underlying_coin_denom	String	Underlying asset denomination of stAsset (Sei)
unbonding_period	u64	Time required for the Hub contract to consider an undelegation batch to be fully undelegated (past the unbonding period) [seconds]
peg_recovery_fee	Decimal	Fee applied to stSei generation and redemption
er_threshold	Decimal	Minimum stSei exchange rate before peg recovery fee is applied
reward_denom	String	Native token denomination for distributed bSei rewards (kUSD)
paused	Option<bool>	The pause system operation switch to facilitate smooth contract upgrades and data migration

## InitMsg Instantiates the stSei Hub contract. Adds a specified validator to whitelist and bonds the creator's initial Sei deposit. The creator's initial Sei deposit ensures the stSei supply always be a high enough value to prevent rounding errors in the stSei exchange rate calculation. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct InstantiateMsg { pub epoch_period: u64, pub underlying_coin_denom: String, pub unbonding_period: u64, pub peg_recovery_fee: Decimal, pub er_threshold: Decimal, pub reward_denom: String, pub update_reward_index_addr: String, } ```

Key	Type	Description
epoch_period	u64	Minimum time delay between undelegation batches [seconds]
underlying_coin_denom	String	Underlying asset denomination of stAsset (Sei)
unbonding_period	u64	Time required for the Hub contract to consider an undelegation batch to be fully undelegated (past the unbonding period) [seconds]
peg_recovery_fee	Decimal	Fee applied to stSei generation and redemption
er_threshold	Decimal	Minimum stSei exchange rate before peg recovery fee is applied
reward_denom	String	Native token denomination for distributed bSei rewards (kUSD)
update_reward_index_addr	String	The address allowed to call UpdateGlobalIndex

## ExecuteMsg ### Receive Can be called during a Cw20 token transfer when the Hub contract is the recipient. Allows the token transfer to execute a [Receive Hook ](#receive-hooks)as a subsequent action within the same transaction. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { Receive { sender: String, amount: Uint128, msg: Binary, }, } ```

Key	Type	Description
sender	String	Sender of token transfer
amount	Uint128	Amount of tokens received
msg	Binary	Base64-encoded string of JSON of Receive Hook

### BondForStSei Bonds sei by delegating the sei amount equally between validators from the registry and mints stSei tokens to the message sender. Requires native Sei tokens to be sent to `Hub`. The platform tries to distribute the stake evenly across all validators. Given a single delegation, the exact number of validators that will receive delegations and the amount that they will receive depends on the current distribution of stake. We take a sorted (ASC) list of validators, calculate the desired amount that each validator should have `target_stake = (total delegated + delegation_amount) / num_validators` and begin adding stake up to the desired amount, starting from the validator with the least stake. The exact amount of a single delegation is calculated as `target_stake - validator_stake`, and you'll have as many delegations as it takes to "drain" the delegation\_amount. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { BondForStSei {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ### UpdateGlobalIndex Distributes Sei delegation rewards to stSei holders. Withdraws all accrued delegation rewards to the `Reward Dispatcher` contract and requests the `Reward` contract to update the global reward index value. Can be issued by the specific address .

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum ExecuteMsg {
    UpdateGlobalIndex {
       airdrop_hooks: Option<Vec<Binary>>,
    },
}

Key	Type	Description
airdrop_hooks	Vec<Binary>	Not currently enabled

### WithdrawUnbonded Withdraws unbonded Sei. Requires an unbonding entry to have been made before the unbonding period. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { WithdrawUnbonded {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ### CheckSlashing Checks whether a slashing event occurred and updates state accordingly. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { CheckSlashing {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ### UpdateParams Updates parameter values of the Hub contract. Can only be issued by the creator. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { UpdateParams { epoch_period: Option, unbonding_period: Option, peg_recovery_fee: Option, er_threshold: Option, paused: Option, reward_denom: Option, }, } ```

Key	Type	Description
epoch_period	u64	Minimum time delay between undelegation batches [seconds]
unbonding_period	u64	Time required for the Hub contract to consider an undelegation batch to be fully undelegated (past the unbonding period) [seconds]
peg_recovery_fee	Decimal	Fee applied to stSei generation and redemption
et_threshold	Decimal	Minimum stSei exchange rate before peg recovery fee is applied
paused	bool	The pause system operation switch to facilitate smooth contract upgrades and data migration
reward_denom	String	Native token denomination for distributed bSei rewards (kUSD)

### UpdateConfig Updates the `Hub` contract configuration. Can only be issued by the creator. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { UpdateConfig { rewards_dispatcher_contract: Option, validators_registry_contract: Option, bsei_token_contract: Option, stsei_token_contract: Option, airdrop_registry_contract: Option, rewards_contract: Option, update_reward_index_addr: Option, }, } ```

Key	Type	Description
rewards_dispatcher_contract	String	Contract address of Rewards Dispatcher
validators_registry_contract	String	Contract address of Validators Registry
bsei_token_contract	String	Contract address of bSei's Cw20 token contract
stsei_token_contract	String	Contract address of stSei's Cw20 token contract
airdrop_registry_contract	String	Not currently enabled
rewards_contract	String	Contract address of Reward
update_reward_index_addr	String	The address allowed to call UpdateGlobalIndex

### \[Internal] RedelegateProxy A proxy handler to execute redelegations from Hub address. Can only be executed by[ Validators Registry ](https://docs.kryptonite.finance/developer/staking/broken-reference)or by the owner of the Hub. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { RedelegateProxy { // delegator is automatically set to address of the calling contract src_validator: String, redelegations: Vec<(String, Coin)>, //(dst_validator, amount) }, } ```

Key	Type	Description
src_validator	String	Address of source vaildator in redelegation pair
redelegations	Vec<(String, Coin)>	List of(destination validator, redelegation amount)

### \[Internal] BondRewards Bonds sei by delegating the sei amount equally between validators from the registry. No stSei tokens have been minted. Can only be executed by [Rewards Dispatcher](https://docs.kryptonite.finance/developer/staking/broken-reference). Requires native Sei tokens to be sent to `Hub`. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum ExecuteMsg { BondRewards {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ## Receive Hooks ### Unbond Burns received stSei and equally unbonds a corresponding amount of Sei from a validator from the registry. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum Cw20HookMsg { Unbond {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ## QueryMsg ### Config Gets the `Hub` contract's configuration. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum QueryMsg { Config {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ### ConfigResponse ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct ConfigResponse { pub owner: String, pub update_reward_index_addr: String, pub reward_dispatcher_contract: Option, pub validators_registry_contract: Option, pub bsei_token_contract: Option, pub stsei_token_contract: Option, pub airdrop_registry_contract: Option, // #[deprecated] pub token_contract: Option, } ```

Key	Type	Description
owner	String	Address of the owner
update_reward_index_addr	String	The address allowed to call UpdateGlobalIndex
reward_dispatcher_contract	String	Contract address of Rewards Dispatcher
validators_registry_contract	String	Contract address of Validators Registry
bsei_token_contract	String	Contract address of bSei's Cw20 token contract
stsei_token_contract	String	Contract address of stSei's Cw20 token contract
airdrop_registry_contract	String	Not currently enabled
token_contract	String	Not currently enabled

### State ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum QueryMsg { State {}, } ``` ### StateResponse ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct StateResponse { pub bsei_exchange_rate: Decimal, pub stsei_exchange_rate: Decimal, pub total_bond_bsei_amount: Uint128, pub total_bond_stsei_amount: Uint128, pub last_index_modification: u64, pub prev_hub_balance: Uint128, pub last_unbonded_time: u64, pub last_processed_batch: u64, // #[deprecated] pub total_bond_amount: Uint128, // #[deprecated] pub exchange_rate: Decimal, } ```

Key	Type	Description
bsei_exchange_rate	Decimal	Current bSei <> Sei exchange rate
stset_exchange_rate	Decimal	Current stSei <> Sei exchange rate
total_bond_bsei_amount	Uint128	Total amount of Sei currently bonded by Hub via bSei logic
total_bond_stsei_amount	Uint128	Total amount of Sei currently bonded by Hub via stSei logic
last_index_modification	u64	Unix block timestamp when the global reward index was last updated
prev_hub_balance	Uint128	Hub's sei balance when WithdrawUnbonded was lasted executed. Used to calcutate the actual amount of unbonded Sei
last_unbonded_time	u64	Unix block timestamp when a batch was last undelegated
last_processed_batch	u64	Batch ID of the most recently released batch

### CurrentBatch Gets information about the current undelegation batch. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum QueryMsg { CurrentBatch {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ### CurrentBatchResponse ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct CurrentBatchResponse { pub id: u64, pub requested_bsei_with_fee: Uint128, pub requested_stsei: Uint128, // #[deprecated] pub requested_with_fee: Uint128, } ```

Key	Type	Description
id	u64	Batch ID of the current undelegation batch
requested_bsei_with_fee	Uint128	Amount of (fee-applied)bSei requested for undelegation in this batch
requested_stsei	Uint128	Amount of stSei requested for undelegation in this batch

### WithdrawableUnbonded Gets the amount of undelegated Sei that will be available for withdrawal (unbonding requests past the unbonding period) for the specified user. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum QueryMsg { WithdrawableUnbonded { address: String, }, } ```

Key	Type	Description
address	String	Address of user that previously unbonded Sei via redeeming bSei

```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct WithdrawableUnbondedResponse { pub withdrawable: Uint128, } ```

Key	Type	Description
withdrawable	Uint128	Amount of undelegated Sei availabe for withdrawal

### ### Parameters Gets parameter information. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum QueryMsg { Parameters {}, } ``` | Key | Type | Description | | --- | ---- | ----------- | | | | | | | | | | | | | ### ParametersResponse ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct Parameters { pub epoch_period: u64, pub underlying_coin_denom: String, pub unbonding_period: u64, pub peg_recovery_fee: Decimal, pub er_threshold: Decimal, pub reward_denom: String, pub paused: Option, } ```

Key	Type	Description
epoch_period	u64	Minimum time delay between undelegation batches [seconds]
underlying_coin_denom	String	Underlying asset denomination of stAsset (Sei)
unbonding_period	u64	Time required for the Hub contract to consider an undelegation batch to be fully undelegated (past the unbonding period) [seconds]
peg_recovery_fee	Decimal	Fee applied to stSei generation and redemption
er_threshold	Decimal	Minimum stSei exchange rate before peg recovery fee is applied
reward_denom	String	Native token denomination for distributed bSei rewards (kUSD)
paused	Option<bool>	The pause system operation switch to facilitate smooth contract upgrades and data migration

### UnbondRequests Gets the list of Sei unbonding amounts being unbonded for the specified user. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum QueryMsg { UnbondRequests { address: String, }, } ```

Key	Type	Description
address	String	Address of user that previously unbonded Sei by redeeming stSei

### UnbondRequestsResponse ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct UnbondRequestsResponse { pub address: String, pub requests: UnbondRequest, } pub type UnbondRequest = Vec<(u64, Uint128, Uint128)>; ```

Key	Type	Description
address	String	Address of user that requested to unbond stSei
requests	UnbondRequest	List of unbonding requests made by user

Key	Type	Description
UnbondRequest	Vec<(u64, Uint128, Uint128)>	List of (batch ID, bSei unbond amount, stSei unbond amount)

### AllHistory Gets the historical list of undelegation batch entries. ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] #[serde(rename_all = "snake_case")] pub enum QueryMsg { AllHistory { start_from: Option, limit: Option, }, } ```

Key	Type	Description
start_from*	u64	Batch Id to start query
limit*	u32	Maximum number of query entries

\* = optional ### AllHistoryResponse ```rust #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct AllHistoryResponse { pub history: Vec, } #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)] pub struct UnbondHistoryResponse { pub batch_id: u64, pub time: u64, pub bsei_amount: Uint128, pub bsei_applied_exchange_rate: Decimal, pub bsei_withdraw_rate: Decimal, pub stsei_amount: Uint128, pub stsei_applied_exchange_rate: Decimal, pub stsei_withdraw_rate: Decimal, pub released: bool, // #[deprecated] pub amount: Uint128, // #[deprecated] pub applied_exchange_rate: Decimal, // #[deprecated] pub withdraw_rate: Decimal, } ```

Key	Type	Description
history	Vec<UnbondHistoryResponse>	List of batch information

Key	Type	Description
batch_id	u64	Batch ID
time	u64	Unix block timestamp when this batch was undelegated
bsei_amount	Uint128	(Fee-applied)amount of bSei unbonded in this batch
bsei_applied_exchange_rate	Decimal	bSei exchange rate at the time of batch undelegation
bsei_withdraw_rate	Decimal	Conversion rate applied when users later withdraw from this batch
stsei_amount	Uint128	(Fee-applied)amount of stSei unbonded in this batch
stsei_applied_exchange_rate	Decimal	stSei exchange rate at the time of batch undelegation
stsei_withdraw_rate	Decimal	Convertion rate applied when users later withdraw from this batch
released	bool	Indication on whether is batch is released(processed as fully undelegated by the contract)