CW20 Staking

Introduction

This CW20 Staking ADO allows users to stake a specified CW20 token and to receive rewards in any number of other tokens in proportion to their share. The reward token does not need to be the token they stake with but it can be. The contract allows for two types of rewards:

• Non-allocated rewards: These are rewards that get deposited periodically into the contract and get distributed proportionally to stakers. Rewards that are deposited are instantly granted to the stakers.

• Allocated rewards: The owner deposits a number of tokens to be distributed over the course of a set time. The rewards get distributed the same way, except all of the reward tokens are already deposited in the contract.

The added rewards are distributed proportionally between the stakers that are already staked.

Example

We assume that we instantiated the contract and there are no stakers as of yet. Then the following series of events happen:

1. First user stakes 100 tokens

2. Second user stakes 500 tokens

3. Third user stakes 400 tokens

4. 100 tokens are sent to the contract as rewards

5. Fourth user stakes 1000 tokens

6. 1000 tokens are sent as rewards

In this case, when the 100 coins are sent the pending rewards are as following for each user:

• 10 tokens for user 1

• 50 tokens for user 2

• 40 tokens for user 3

• 0 tokens for user 4 since he staked after the rewards were sent

After the 1000 tokens are sent to the contract as rewards, it is split as follows:

• 50 tokens for user 1 (60 in total)

• 250 tokens for user 2 (300 in total)

• 200 tokens for user 3 (240 in total)

• 500 tokens for user 4 (500 in total since did not receive rewards from first batch)

After the rewards have been sent, the stakers would not receive any extra rewards until a next batch of rewards are sent.

Ado_type: cw20-staking

InstantiateMsg

The additional rewards should not include the staking token.

Rust

pub struct InstantiateMsg {
  pub staking_token: AndrAddr,
  pub additional_rewards: Option<Vec<RewardTokenUnchecked>>,
  pub kernel_address: String,
  pub owner: Option<String>
}

JSON

{
"staking_token":"andr1...",
"additional_rewards": [{
          "asset_info":{
              "cw20":"andr1..."
              },
          "init_timestamp": 104329432909800,
          "allocation_config":{
              "till_timestamp": 104334432,
              "cycle_rewards":"300",
              "cycle duration":"400"
              }
          }],
 "kernel_address":"andr1..."

     }

Name	Type	Description
staking_token	AndrAddr	Reference to the CW20 token that can be staked. Can be either the contract address or a VFS path.
additional_rewards	Option<Vec<RewardTokenUnchecked>>	Any rewards in addition to the staking token. This list cannot include the staking token since it is used as a reward by default. Can have a maximum of 10 reward tokens.
kernel_address	String	Contract address of the kernel contract to be used for AMP messaging. Kernel contract address can be found in our deployed contracts.
owner	Option<String>	Optional address to specify as the owner of the ADO being created. Defaults to the sender if not specified.

RewardTokenUnchecked

pub struct RewardTokenUnchecked {
    pub asset_info: AssetInfoUnchecked,
    pub init_timestamp: MillisecondsExpiration,
    pub allocation_config: Option<AllocationConfig>,
}

Name	Type	Description
asset_info	AssetInfoUnchecked	The asset used as a reward.
init_timestamp	MillisecondsExpiration	Timestamp from which Rewards will start getting accrued against the staked LP tokens. Specified in milliseconds.
allocation_config	Option<AllocationConfig>	How to allocate the asset_info as rewards. If not set, then the rewards are of the "non-allocated" type.

AssetInfoUnchecked

pub type AssetInfoUnchecked = AssetInfoBase<String>

AssetInfoBase

pub enum AssetInfoBase<T> {
    Native(String),
    Cw20(T),
}

• Cw20: To create an asset info instance of this type, provide the contract address

• Native: To create an asset info instance of this type, provide the denomination

AllocationConfig

pub struct AllocationConfig {
    pub till_timestamp: MillisecondsExpiration,
    pub cycle_rewards: Uint128,
    pub cycle_duration: MillisecondsDuration,
    pub reward_increase: Option<Decimal>,
}

Name	Type	Description
till_timestamp	MillisecondsExpiration	Timestamp in milliseconds till which rewards will be accrued. No staking rewards are accrued beyond this timestamp.
cycle_rewards	Uint128	Rewards distributed during the 1st cycle.
cycle_duration	MillisecondsDuration	Cycle duration in milliseconds.
reward_increase	Optional<Decimal>	Percent increase in Rewards per cycle.

ExecuteMsg

Receive

Receives CW20 tokens which can be staked, or used to update the global index depending on the attached Cw20HookMsg.

pub enum ExecuteMsg {
    Receive(Cw20ReceiveMsg),
 }

Cw20ReceiveMsg

pub struct Cw20ReceiveMsg {
    pub sender: String,
    pub amount: Uint128,
    pub msg: Binary,
}

The msg in the Cw20ReceiveMsgshould be a Cw20HookMsg.

Cw20HookMsg

These messages need to be attached as a base64 encoded msg when sending CW20 tokens.

pub enum Cw20HookMsg {
    StakeTokens {},
    UpdateGlobalIndex {},
}

StakeTokens: Stake the sent tokens. Address must match the staking_token given on instantiation. The user's pending rewards and indexes are updated for each additional reward token.

UpdateGlobalIndex: Updates the global reward index on deposit of a valid cw20 token.

AddRewardToken

Add reward_token as another reward token. A maximum of 10 reward tokens can be added.

Only available to the contract owner.

Rust

pub enum ExecuteMsg {
      AddRewardToken {
        reward_token: RewardTokenUnchecked,
    },
}

JSON

{
"add_reward_token":{
        "reward_token":{
                "cw20":"andr1..."
                }
     }
} 

Name	Type	Description
reward_token	RewardTokenUnchecked	The token to be added as a reward.

UnstakeTokens

Unstakes the specified amount of assets, or all if not specified. The user's pending rewards and indexes are updated for each additional reward token.

Rust

pub enum ExecuteMsg {
     UnstakeTokens {
        amount: Option<Uint128>,
    },
}

JSON

{
"unstake_tokens":{
    "amount":"500"
    }
}

Name	Type	Description
amount	Option<Uint128>	Optional amount to unstake. Defaults to the maximum amount.

ClaimRewards

Claims any outstanding rewards from the additional reward tokens.

Rust

pub enum ExecuteMsg {
    ClaimRewards {},
    }

JSON

{
"claim_rewards":{}
}

UpdateGlobalIndexes

Updates the global reward index for the specified assets or all of the specified ones if none is specified. Funds may be sent along with this. Usually called when new allocated rewards are deposited to update the rewards accordingly.

Rust

pub enum ExecuteMsg {
     UpdateGlobalIndexes {
        asset_infos: Option<Vec<AssetInfoUnchecked>>,
    },
}

JSON

"update_global_indexes":{}

Name	Type	Description
asset_infos	Option<Vec<AssetInfoUnchecked>>	Optional vector to specify the assets to update the global index for.

AndrReceive

The rest of the executes can be found in the AndrReceive section.

QueryMsg

Config

Gets the config of the contract.

Rust

pub enum QueryMsg {
       #[returns(Config)]
       Config {},
 }

JSON

{
"config":{}
}

Config

Returns the config structure.

Rust

pub struct Config {
    pub staking_token: AndrAddr,
    pub number_of_reward_tokens: u32,
}

JSON

{
"staking_token":"identifier":"andr1...",
"number_of_rewards_tokens": 7                   
}

Name	Type	Description
staking_token	AndrAddr	The token accepted for staking.
number_of_reward_tokens	u32	The current number of reward tokens, cannot exceed the maximum of 10.

State

Gets the state of the contract. Returns the total share of the staking token in the contract

Rust

pub enum QueryMsg {
    #[returns(State)]
    State {},
    }

JSON

{
"state":{}
}

State

Returns the State structure.

Rust

pub struct State {
    pub total_share: Uint128,
}

JSON

{
"total_share":"1000"
}

Name	Type	Description
total_share	Uint128	The total share/amount of the staking token in the contract.

Staker

Returns a StakerResponse for the given staker. The pending rewards are updated to the present index.

Rust

pub enum QueryMsg {
      #[returns(StakerResponse)]
      Staker {
        address: String,
    },
}

JSON

{
"staker":{
    "address":"andr1..."
    }
}

Name	Type	Description
address	String	The address of the staker to check

StakerResponse

Rust

pub struct StakerResponse {
    pub address: String,
    pub share: Uint128,
    pub balance: Uint128,
    pub pending_rewards: Vec<(String, Uint128)>,
}

JSON

{
    "address": "andr1...",
    "share": "10000000",
    "pending_rewards": [
      [
        "native:uandr",
        "3333333"
      ]
    ]
}

Name	Type	Description
address	String	The address of the staker.
share	Uint128	The staker's share of the staked tokens.
balance	Uint128	How many staking tokens the user has which is the staked amount + rewarded tokens.
pending_rewards	Vec<(String,Uint)>	The staker's pending rewards represented as [(token_1, amount_1), ..., (token_n, amount_n)]

Stakers

Returns a Vec<StakerResponse> for range of stakers. The pending rewards are updated to the present index for each staker.

Rust

pub enum QueryMsg {
   #[returns(Vec<StakerResponse>)]
   Stakers {
          start_after: Option<String>,
          limit: Option<u32>,
            },
        }

JSON

{
"stakers":{
    "limit":20
    }
}

start_after	Option<String>	An optional address to start after. Used for pagination.
limit	Optional<u32>	An optional limit to the number of stakers to query. Defaults to 10 and can be set to a maximum of 30.

Returns a vector of StakerResponse.

AndrQuery

A set of base queries common to all Andromeda ADOs. Check AndrQuery.