Staker

Liquidity mining and reward distribution for LP positions.

Overview

Staker manages distribution of internal (GNS emission) and external (user-provided) rewards to staked LP positions, with time-weighted rewards and warmup periods.

Configuration

• Deposit GNS Amount: 1,000 GNS for external incentives (default)
• Minimum Reward Amount: 1,000 tokens (default)
• Unstaking Fee: 1% (default)
• Pool Tiers: 1, 2, or 3 (assigned per pool)
• Warmup Schedule: 30/50/70/100% over 30/60/90 days
• External Token Whitelist: Approved reward tokens

Core Features

Internal Rewards (GNS Emission)

• Allocated to tiered pools (tiers 1, 2, 3)
• Split across tiers by TierRatio
• Distributed proportionally to in-range liquidity
• Unclaimed rewards go to community pool

External Rewards (User Incentives)

• Created for specific pools
• Constant reward per block
• Proportional to staked liquidity
• Unclaimed rewards returned to creator

Warmup Periods

Every staked position progresses through warmup periods:

• 0-30 days: 30% rewards (70% to community/creator)
• 30-60 days: 50% rewards (50% to community/creator)
• 60-90 days: 70% rewards (30% to community/creator)
• 90+ days: 100% rewards

Key Functions

StakeToken

Stakes LP position NFT to earn rewards.

UnStakeToken

Unstakes position and collects all rewards.

CollectReward

Collects accumulated rewards without unstaking.

MintAndStake

Mints new position and stakes in single transaction.

CreateExternalIncentive

Creates external reward program for specific pool.

EndExternalIncentive

Ends incentive program and returns unused rewards.

Reward Calculation Logic

Tier Ratio Distribution

Emission split across tiers based on active pools:

If only tier 1 has pools:    [100%, 0%, 0%]
If tiers 1 & 3 have pools:   [80%, 0%, 20%]
If tiers 1 & 2 have pools:   [70%, 30%, 0%]
If all tiers have pools:     [50%, 30%, 20%]

Mathematical representation:

TierRatio(t) =
  [1, 0, 0]        if Count(2) = 0 ∧ Count(3) = 0
  [0.8, 0, 0.2]    if Count(2) = 0
  [0.7, 0.3, 0]    if Count(3) = 0
  [0.5, 0.3, 0.2]  otherwise

Pool Reward Formula

poolReward(pool) = (emission × TierRatio[tier(pool)]) / Count(tier(pool))

Where emission is calculated as:

emission = GNSEmissionPerSecond × (avgMsPerBlock/1000) × StakerEmissionRatio

Position Reward Calculation

The reward for each position is calculated through:

1. Cache pool rewards up to current block
2. Retrieve position state from deposit records
3. Calculate internal rewards if pool is tiered
4. Calculate external rewards for active incentives
5. Apply warmup penalties based on stake duration

Mathematical formula for total reward ratio:

TotalRewardRatio(s,e) = Σ[i=0 to m-1] ΔRaw(αᵢ, βᵢ) × rᵢ

where:
  αᵢ = max(s, Hᵢ₋₁)
  βᵢ = min(e, Hᵢ)

ΔRaw(a, b) = CalcRaw(b) - CalcRaw(a)

CalcRaw(h) =
  L(h) - U(h)           if tick(h) < ℓ
  U(h) - L(h)           if tick(h) ≥ u
  G(h) - (L(h) + U(h))  otherwise

where:
  L(h) = tickLower.OutsideAccumulation(h)
  U(h) = tickUpper.OutsideAccumulation(h)
  G(h) = globalRewardRatioAccumulation(h)
  ℓ = tickLower.id
  u = tickUpper.id

Final position reward:

finalReward = TotalRewardRatio × poolReward × positionLiquidity
            = ∫[s to e] (poolReward × positionLiquidity) / TotalStakedLiquidity(h) dh

Tick Cross Hook

When price crosses an initialized tick with staked positions:

1. Updates staked liquidity - Adjusts total staked liquidity
2. Updates reward accumulation - Recalculates globalRewardRatioAccumulation
3. Manages unclaimable periods - Starts/ends periods with no in-range liquidity
4. Updates tick accumulation - Adjusts CurrentOutsideAccumulation

The globalRewardRatioAccumulation tracks the integral:

globalRewardRatioAccumulation = ∫ 1/TotalStakedLiquidity(h) dh

This integral is only computed when TotalStakedLiquidity(h) ≠ 0, enabling precise reward calculation even as liquidity changes.

Reward State Tracking

The system maintains:

• Global accumulation: Tracks reward ratio across all positions
• Tick accumulation: Tracks rewards "outside" each tick
• Position state: Individual reward calculation parameters

Usage

 1// Stake existing position
 2StakeToken(123, "g1referrer...")
 3
 4// Create external incentive
 5CreateExternalIncentive(
 6    "gno.land/r/demo/bar:gno.land/r/demo/baz:3000",
 7    "gno.land/r/demo/reward",
 8    "1000000000",  // 1000 tokens
 9    startTime,
10    endTime,
11)
12
13// Collect rewards without unstaking
14CollectReward(123)
15
16// Unstake and collect all rewards
17UnStakeToken(123)

Security

• Positions locked during staking
• External incentives require GNS deposit
• Warmup periods prevent gaming
• Unclaimed rewards properly redirected
• Hook integration ensures accurate tracking