The Liquidity Pools pallet is a fully permissionless Substrate pallet that enables the creation and management of liquidity pools for any asset pair. It provides a flexible framework for users to stake their assets in pools and earn rewards, with automatic rollover capabilities to maintain continuous participation across successive pools.

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Calls

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create_pool

Creates a new liquidity pool specifying reward and staked asset IDs, interest rate, maximum token limit, and lock period (start and end blocks). Anyone can create a pool without special permissions. Namespace 
api.tx.liquidityPools.createPool
Type 
function create_pool(reward_asset_id: u32, staked_asset_id: u32, interest_rate: u32, max_tokens: u128, lock_start_block: u32, lock_end_block: u32)

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set_pool_succession

Links a predecessor pool to a successor pool, enabling automatic rollover of user stakes when the predecessor pool completes its cycle. Namespace 
api.tx.liquidityPools.setPoolSuccession
Type 
function set_pool_succession(predecessor_pool_id: u32, successor_pool_id: u32)

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set_pool_rollover

Lets users opt in or out of automatic rollover to the successor pool when the current pool matures. Namespace 
api.tx.liquidityPools.setPoolRollover
Type 
function set_pool_rollover(id: u32, should_rollover: bool)

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close_pool

Allows a pool creator to close their pool. Upon closing, only unclaimed reward tokens are returned to the creator. Staked tokens remain in the pool for users to withdraw. The pool remains in the Closed state until all user funds are withdrawn. Namespace 
api.tx.liquidityPools.closePool
Type 
function close_pool(id: u32)

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enter_pool

Enables users to join an open pool by staking their assets up to the pool’s maximum capacity. Namespace 
api.tx.liquidityPools.enterPool
Type 
function enter_pool(pool_id: u32, amount: u128)

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exit_pool

Permits users to withdraw their staked assets from an Open pool before the lock period begins, and also from a Closed pool after the pool has been manually closed by the creator. Namespace 
api.tx.liquidityPools.exitPool
Type 
function exit_pool(id: u32)

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claim_reward

Allows users to claim their earned rewards after a pool matures. If the user opted out of rollover, their principle is also returned. Namespace 
api.tx.liquidityPools.claimReward
Type 
function claim_reward(id: u32)

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rollover_unsigned

An internal extrinsic executed by the offchain worker to process the automatic rollover of user stakes. Namespace 
api.tx.liquidityPools.rolloverUnsigned
Type 
function rollover_unsigned(id: u32, current_block: u32)

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Storage

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Pools

Stores information about each liquidity pool Namespace 
api.query.liquidityPools.pools
Type 
function pools(pool_id: u32) -> Option<PoolInfo>

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PoolUsers

Tracks user participation in pools Namespace 
api.query.liquidityPools.poolUsers
Type 
function poolUsers(pool_id: u32, account_id: AccountId) -> Option<UserInfo>

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PoolRelationships

Maps predecessor pools to successor pools Namespace 
api.query.liquidityPools.poolRelationships
Type 
function poolRelationships(pool_id: u32) -> Option<PoolRelationship>

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NextPoolId

Increment-only unique pool id Namespace 
api.query.liquidityPools.nextPoolId
Type 
function nextPoolId() -> u32

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NextRolloverUnsignedAt

Tracks when next rollover should occur Namespace 
api.query.liquidityPools.nextRolloverUnsignedAt
Type 
function nextRolloverUnsignedAt() -> u32

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RolloverPivot

Tracks progress during batch rollover operations Namespace 
api.query.liquidityPools.rolloverPivot
Type 
function rolloverPivot(pool_id: u32) -> BoundedVec<u8, MaxStringLength>

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ProcessedPoolPivot

Tracks the next pool id pivot used for batched processing during on_idle. Namespace 
api.query.liquidityPools.processedPoolPivot
Type 
function processedPoolPivot() -> u32

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Events

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PoolOpen

When a new pool is created Namespace 
api.events.liquidityPools.PoolOpen
Type 
struct PoolOpen {
  pool_id: u32, 
  reward_asset_id: u32, 
  staked_asset_id: u32, 
  interest_rate: u32, 
  max_tokens: u128, 
  lock_start_block: u32, 
  lock_end_block: u32
}

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PoolStarted

When a pool enters lock period Namespace 
api.events.liquidityPools.PoolStarted
Type 
struct PoolStarted {
  pool_id: u32
}

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PoolRenewing

When a pool starts rollover process Namespace 
api.events.liquidityPools.PoolRenewing
Type 
struct PoolRenewing {
  pool_id: u32
}

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PoolMatured

When a pool is ready for rewards claiming Namespace 
api.events.liquidityPools.PoolMatured
Type 
struct PoolMatured {
  pool_id: u32
}

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PoolClosed

When a pool is closed Namespace 
api.events.liquidityPools.PoolClosed
Type 
struct PoolClosed {
  pool_id: u32, 
  reward_asset_amount: u128, 
  staked_asset_amount: u128, 
  receiver: AccountId
}
Note: On close, only reward tokens are transferred to the creator; users must exit to withdraw staked tokens.

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SetSuccession

When pools are linked for rollover Namespace 
api.events.liquidityPools.SetSuccession
Type 
struct SetSuccession {
  predecessor_pool_id: u32, 
  successor_pool_id: u32
}

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UserInfoUpdated

When user rollover preference is updated Namespace 
api.events.liquidityPools.UserInfoUpdated
Type 
struct UserInfoUpdated {
  pool_id: u32, 
  account_id: AccountId, 
  should_rollover: bool
}

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UserJoined

When user joins a pool Namespace 
api.events.liquidityPools.UserJoined
Type 
struct UserJoined {
  account_id: AccountId, 
  pool_id: u32, 
  amount: u128
}

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UserExited

When user exits a pool Namespace 
api.events.liquidityPools.UserExited
Type 
struct UserExited {
  account_id: AccountId, 
  pool_id: u32, 
  amount: u128
}

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UserRolledOver

When user is rolled over to successor pool Namespace 
api.events.liquidityPools.UserRolledOver
Type 
struct UserRolledOver {
  account_id: AccountId, 
  pool_id: u32, 
  rolled_to_pool_id: u32, 
  amount: u128
}

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RewardsClaimed

When rewards are claimed Namespace 
api.events.liquidityPools.RewardsClaimed
Type 
struct RewardsClaimed {
  account_id: AccountId, 
  pool_id: u32, 
  amount: u128
}

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Errors

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NotPoolCreator

Caller is not the pool creator Namespace 
api.errors.liquidityPools.NotPoolCreator

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InvalidBlockRange

Invalid block range for pool Namespace 
api.errors.liquidityPools.InvalidBlockRange

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PoolAlreadyExists

Pool already exists Namespace 
api.errors.liquidityPools.PoolAlreadyExists

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PoolDoesNotExist

Pool does not exist Namespace 
api.errors.liquidityPools.PoolDoesNotExist

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SuccessorPoolDoesNotExist

Successor pool does not exist Namespace 
api.errors.liquidityPools.SuccessorPoolDoesNotExist

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PredecessorPoolDoesNotExist

Predecessor pool does not exist Namespace 
api.errors.liquidityPools.PredecessorPoolDoesNotExist

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SuccessorPoolSizeShouldBeGreaterThanPredecessor

Successor pool too small Namespace 
api.errors.liquidityPools.SuccessorPoolSizeShouldBeGreaterThanPredecessor

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SuccessorPoolSizeShouldBeLockedAfterPredecessor

Invalid successor timing Namespace 
api.errors.liquidityPools.SuccessorPoolSizeShouldBeLockedAfterPredecessor

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RolloverPoolsShouldBeTheSameAsset

Asset mismatch between pools Namespace 
api.errors.liquidityPools.RolloverPoolsShouldBeTheSameAsset

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NoTokensStaked

No tokens staked for operation Namespace 
api.errors.liquidityPools.NoTokensStaked

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PoolNotOpen

Pool not in open state Namespace 
api.errors.liquidityPools.PoolNotOpen

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NotReadyForClaimingReward

Pool not mature for claiming Namespace 
api.errors.liquidityPools.NotReadyForClaimingReward

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NoAvailablePoolId

Exceeds maximum pool ID Namespace 
api.errors.liquidityPools.NoAvailablePoolId

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StakingLimitExceeded

Pool capacity limit reached Namespace 
api.errors.liquidityPools.StakingLimitExceeded

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OffchainErrNotValidator

Offchain worker not validator Namespace 
api.errors.liquidityPools.OffchainErrNotValidator

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OffchainErrTooEarly

Offchain worker called too early Namespace 
api.errors.liquidityPools.OffchainErrTooEarly

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OffchainErrSubmitTransaction

Offchain transaction submission error Namespace 
api.errors.liquidityPools.OffchainErrSubmitTransaction

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OffchainErrWrongTransactionSource

Offchain transaction source error Namespace 
api.errors.liquidityPools.OffchainErrWrongTransactionSource

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PivotStringTooLong

Pivot string exceeds maximum length Namespace 
api.errors.liquidityPools.PivotStringTooLong

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PoolAlreadyClosed

Pool is already in the Closed state Namespace 
api.errors.liquidityPools.PoolAlreadyClosed

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CannotExitPool

Cannot exit the pool in the current state or conditions Namespace 
api.errors.liquidityPools.CannotExitPool

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RewardCalculationOverflow

Overflow occurred during reward calculation Namespace 
api.errors.liquidityPools.RewardCalculationOverflow