Shadow Arena #020: Arrakis V2

You built Uniswap V3 from scratch. Arrakis V2 is what got shipped on top of it: a multi-chain LP vault manager that parks vault funds across V3 ranges and fee tiers, rebalancing on an operator's command. To do that, someone reimplemented the amounts-from-liquidity math you wrote in SqrtPriceMath and LiquidityAmounts — and got the boundary case wrong. The bugs live exactly where the fork re-derives V3 mechanics: liquidity-to-amounts conversion, spot-vs-oracle deviation defense, multi-fee-tier slippage, and fee-growth checkpointing. Four representative findings (1 H + 3 M).

Scope (1317 SLOC)

File	SLOC	Description
v2-core/contracts/libraries/Underlying.sol	472	Computes a vault's underlying token0/token1 across all V3 positions: reimplements getAmountsForDelta (liquidity -> amounts) and getFeesEarned (fee growth). The amounts-from-liquidity branching you wrote in the build module lives here.
v2-manager-templates/contracts/SimpleManager.sol	293	Operator-gated rebalance entrypoint. Checks each minting pool's spot price against a Chainlink oracle (maxDeviation) before letting the operator swap and re-provide liquidity on the underlying V3 pools.
v2-core/contracts/ArrakisV2.sol	343	Core vault: rebalance() burns ranges, runs an operator-supplied swap via a whitelisted router (low-level call), then mints liquidity on V3 pools and enforces min-deposit slippage. Also applies manager fees on collected V3 fees.
v2-core/contracts/abstract/ArrakisV2Storage.sol	209	Vault storage and admin setters: managerFeeBPS, managerBalance0/1, and setManagerFeeBPS. _applyFees reads managerFeeBPS live when crediting the manager's cut of collected fees.

Documentation

Source Code Protocol Docs

Part of the Uniswap V3 Path

This shadow audit connects to the Uniswap V3 Build module. Students who built the concentrated-liquidity pool have an advantage because they understand tick accounting, the swap loop, fee growth, the observation oracle, and callback-based payment.

View Build Module

Duration4 days

Total Findings4

Scope1317 SLOC

PriceFree