> ## Documentation Index > Fetch the complete documentation index at: https://mohai.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Staking ## Abstract The staking precompiled contract acts as a bridge to enable the Stable SDK’s x/staking module functionality to be used in an EVM environment. ## Contents 1. [Concepts](/coreMechanics/SystemModulesPrecompiles/staking#concepts) 2. [Configuration](/coreMechanics/SystemModulesPrecompiles/staking#configuration) 3. [Methods](/coreMechanics/SystemModulesPrecompiles/staking#methods) 4. [Events](/coreMechanics/SystemModulesPrecompiles/staking#events) ## Concepts In x/staking module in Stable SDK, bond denom must be registered during chain initialization for staking. Validator and delegator only can use bond denom staking token. In staking precompiled contract, additional checks are made to ensure that the validator or delegator is a caller. ## Configuration Contract address and gas cost is predefined. ### Contract Address * ## Methods ### createValidator A validator is created. The validator must be created with an initial delegation from the operator. For potential delegators, validator should offer their information and plan for commission rate. Delegator can choose validator to delegate their own tokens by disclosed information with natural regulation from market mechanism. CreateValidator is emitted when the validator is successfully registered. #### Inputs | Name | Type | Description | | ----------------- | --------------- | ------------------------------------------------------------------------- | | description | Description | information of the validator | | commissionRates | CommissionRates | commission rate of the staking token rewarded by the validator | | minSelfDelegation | uint256 | the minimum self-delegation amount of the validator | | validatorAddress | address | the address of the validator | | pubkey | string | the public key of the validator | | value | uint256 | the amount of the staking token initially self-delegated to the validator | Description is a struct with the following fields: | Name | Type | Description | | --------------- | ------ | --------------------------------------- | | moniker | string | name of the validator | | identity | string | the identity of the validator | | website | string | the url of the validator’s website | | securityContact | string | security contract information | | details | string | additional description of the validator | CommissionRates is a struct with the following fields: | Name | Type | Description | | ------------- | ------- | ---------------------------------------------------------------- | | rate | uint256 | current commission rate that the validator receives | | maxRate | uint256 | the maximum commission rate (cannot be set higher than this) | | maxChangeRate | uint256 | the maximium commission rate that validator can change for a day | rate should be set to an appropriate value acceptable to the market. * If validator’s commission rate is higher, delegator’s profit is lower. * If validator’s commission rate is lower, validator’s profit is lower and it makes operation difficult. Since high maxRate can make delegator concern about unexpected high commission rate by validator, maxRate should be set carefully. maxChangeRate is unchangeable when initialized. #### Outputs | Name | Type | Description | | ------- | ---- | ------------------------------------------------ | | success | bool | true if the validator is successfully registered | ### editValidator Validator updates its information. Validator only can update information except unchangeable fields such as maxRate and maxChangeRate in CommissionRates struct. EditValidator is emitted when the validator is successfully updated. #### Inputs | Name | Type | Description | | ----------------- | ----------- | ------------------------------------------------------------------ | | description | Description | information of the validator | | validatorAddress | address | the address of the validator | | commissionRate | int256 | the commission rate of the staking token rewarded by the validator | | minSelfDelegation | int256 | the minimum self-delegation amount of the validator | #### Outputs | Name | Type | Description | | ------- | ---- | --------------------------------------------- | | success | bool | true if the validator is successfully updated | ### delegate Delegator sets the amount of token to be delegated to the validator. Delegate is emitted when the delegation is successfully done. #### Inputs | Name | Type | Description | | ---------------- | ------- | ---------------------------------------------------------- | | delegatorAddress | address | the address of the delegator | | validatorAddress | address | the address of the validator | | amount | uint256 | the amount of the staking token delegated to the validator | #### Outputs | Name | Type | Description | | ------- | ---- | ------------------------------------------- | | success | bool | true if the delegation is successfully done | #### Events newShares indicates the ownership ratio of the delegator. The shares calculated may vary depending on the time even though the same amount of tokens are delegated. ### undelegate Delegator withdraws the amount of token delegated to the validator. Unbond is emitted when the undelegation is successfully done. #### Inputs | Name | Type | Description | | ---------------- | ------- | ------------------------------------------------------------------------ | | delegatorAddress | address | the address of the delegator | | validatorAddress | address | the address of the validator | | amount | uint256 | the amount of the staking token willing to undelegate from the validator | #### Outputs | Name | Type | Description | | ------- | ---- | --------------------------------------------- | | success | bool | true if the undelegation is successfully done | ### redelegate Delegator redelegates the amount of token delegated to the validator to another validator. Redelegate is emitted when the redelegate is successfully done. #### Inputs | Name | Type | Description | | ---------------- | ------- | ------------------------------------------------ | | delegatorAddress | address | the address of the delegator | | validatorSrc | string | the address of the source validator | | validatorDst | string | the address of the destination validator | | amount | uint256 | the amount of the staking token for redelegation | #### Outputs | Name | Type | Description | | ------- | ---- | ------------------------------------------- | | success | bool | true if the redelegate is successfully done | ### delegation Returns the delegation information between a delegator and a validator. If there is no delegation found, the shares and balance will be 0. #### Inputs | Name | Type | Description | | ---------------- | ------- | ---------------------------- | | delegatorAddress | address | the address of the delegator | | validatorAddress | address | the address of the validator | #### Outputs | Name | Type | Description | | ------- | ------- | --------------------------------------- | | shares | uint256 | the delegated shares | | balance | Coin | the amount of delegated token and denom | Coin is a struct with the following fields: | Name | Type | Description | | ------ | ------- | ------------------------ | | denom | string | the denom of the reward | | amount | uint256 | the amount of the reward | ### unbondingDelegation Returns the unbonding delegation information between a delegator and a validator. If there is no unbonding delegation found, empty UnbondingDelegationOutput will be returned. #### Inputs | Name | Type | Description | | ---------------- | ------- | ---------------------------- | | delegatorAddress | address | the address of the delegator | | validatorAddress | address | the address of the validator | #### Outputs | Name | Type | Description | | ------------------- | ------------------------- | ------------------------------------------- | | unbondingDelegation | UnbondingDelegationOutput | the information of the unbonding delegation | UnbondingDelegationOutput is a struct with the following fields: | Name | Type | Description | | ---------------- | --------------------------- | --------------------------------------- | | validatorAddress | address | the address of the validator | | delegatorAddress | address | the address of the delegator | | entries | UnbondingDelegationEntry\[] | the entries of the unbonding delegation | UnbondingDelegationEntry is a struct with the following fields: | Name | Type | Description | | -------------- | ------ | -------------------------------- | | creationHeight | uint64 | the creation height of the entry | | completionTime | uint64 | the completion time of the entry | | initialBalance | Coin | the initial balance of the entry | | balance | Coin | the balance of the entry | ### validator Returns the validator information. If there is no validator found, empty ValidatorOutput will be returned. #### Inputs | Name | Type | Description | | ---------------- | ------- | ---------------------------- | | validatorAddress | address | the address of the validator | #### Outputs | Name | Type | Description | | --------- | --------- | -------------------------------- | | validator | Validator | the information of the validator | Validator is a struct with the following fields: | Name | Type | Description | | ----------------- | ------- | ------------------------------------------------------------------ | | operatorAddress | address | the address of the validator | | consensusPubkey | string | the public key of the validator | | jailed | bool | whether the validator is jailed or not | | status | int32 | the status of the validator | | tokens | uint256 | the amount of the staking token delegated to the validator | | delegatorShares | uint256 | the amount of the delegation shares | | description | string | the description of the validator | | unbondingHeight | int64 | the height at which the validator is unbonding | | unbondingTime | int64 | the time at which the validator is unbonding | | commission | uint256 | the commission rate of the staking token rewarded by the validator | | minSelfDelegation | uint256 | the minimum self-delegation amount of the validator | ### validators Returns all validators matched with the status. If there is no validator found, empty ValidatorsOutput will be returned. Status, declared in x/staking module, can be one of the following: * 0 : “BOND\_STATUS\_UNSPECIFIED”, unspecified status * 1 : “BOND\_STATUS\_UNBONDING”, validator is unbonding * 2 : “BOND\_STATUS\_UNBONDED”, validator is unbonded * 3 : “BOND\_STATUS\_BONDED”, validator is bonded #### Inputs | Name | Type | Description | | ----------- | ------- | --------------------------- | | status | string | the status of the validator | | pageRequest | PageReq | request for pagination | PageReq is a struct with the following fields: | Name | Type | Description | | ---------- | ----- | --------------------------------------------------- | | key | bytes | the key of the page | | offset | int64 | the offset of the page | | limit | int64 | the limit of the page | | countTotal | bool | whether to count the total number of results or not | | reverse | bool | whether to reverse the results or not | #### Outputs | Name | Type | Description | | ------------ | ------------ | ---------------------------- | | validators | Validator\[] | the arrays of the validators | | pageResponse | PageResp | response for pagination | PageResp is a struct with the following fields: | Name | Type | Description | | ------- | ------ | ------------------------------- | | nextKey | bytes | the next key of the page | | total | uint64 | the total number of the results | ### redelegation Returns the redelegation information of delegator, source validator and destination validator. If there is no redelegation found, empty RedelegationOutput will be returned. #### Inputs | Name | Type | Description | | ------------------- | ------- | ---------------------------------------- | | delegatorAddress | address | the address of the delegator | | srcValidatorAddress | address | the address of the source validator | | dstValidatorAddress | address | the address of the destination validator | #### Outputs | Name | Type | Description | | ------------ | ------------------ | ----------------------------------- | | redelegation | RedelegationOutput | the information of the redelegation | RedelegationOutput is a struct with the following fields: | Name | Type | Description | | ------------------- | -------------------- | ---------------------------------------- | | delegatorAddress | address | the address of the delegator | | validatorSrcAddress | address | the address of the source validator | | validatorDstAddress | address | the address of the destination validator | | entries | RedelegationEntry\[] | the entries of the redelegation | RedelegationEntry is a struct with the following fields: | Name | Type | Description | | -------------- | ------ | -------------------------------- | | creationHeight | uint64 | the creation height of the entry | | completionTime | uint64 | the completion time of the entry | | initialBalance | Coin | the initial balance of the entry | | balance | Coin | the balance of the entry | ### redelegations Returns all redelegations of delegator, source validator and destination validator. If there is no redelegation found, empty RedelegationResponse and PageResp will be returned. #### Inputs | Name | Type | Description | | ------------------- | ------- | ---------------------------------------- | | delegatorAddress | address | the address of the delegator | | srcValidatorAddress | address | the address of the source validator | | dstValidatorAddress | address | the address of the destination validator | | pageRequest | PageReq | request for pagination | #### Outputs | Name | Type | Description | | ------------ | ----------------------- | ------------------------------------ | | response | RedelegationResponse\[] | the information of the redelegations | | pageResponse | PageResp | response for pagination | ## Events ### CreateValidator | Name | Type | Indexed | Description | | -------- | ------- | ------- | ------------------------------------------------------------------------- | | valiAddr | address | Y | the address of the validator | | value | uint256 | N | the amount of the staking token initially self-delegated to the validator | ### EditValidator | Name | Type | Indexed | Description | | ----------------- | ------- | ------- | -------------------------------------------------------------------------- | | valiAddr | address | Y | the address of the validator | | commissionRate | int256 | N | the updated commission rate of the staking token rewarded by the validator | | minSelfDelegation | int256 | N | the updated minimum self-delegation amount of the validator | ### Delegate | Name | Type | Indexed | Description | | ------------- | ------- | ------- | ---------------------------------------------------------- | | delegatorAddr | address | Y | the address of the delegator | | validatorAddr | string | Y | the address of the validator | | amount | uint256 | N | the amount of the staking token delegated to the validator | | newShares | uint256 | N | the amount of the delegation shares after the delegation | ### Unbond | Name | Type | Indexed | Description | | -------------- | ------- | ------- | -------------------------------------------------------------- | | delegatorAddr | address | Y | the address of the delegator | | validatorAddr | string | Y | the address of the validator | | amount | uint256 | N | the amount of the staking token undelegated from the validator | | completionTime | uint256 | N | the completion time of the undelegation | ### Redelegate | Name | Type | Indexed | Description | | ------------------- | ------- | ------- | ------------------------------------------------ | | delegatorAddr | address | Y | the address of the delegator | | validatorSrcAddress | address | Y | the address of the source validator | | validatorDstAddress | address | Y | the address of the destination validator | | amount | uint256 | N | the amount of the staking token for redelegation | | completionTime | uint256 | N | the completion time of the redelegate |