Add EulerSwap hook on ethereum

[hooklist-generator]

Summary

A Uniswap v4 hook implementing a custom AMM backed by Euler Finance vault positions. In beforeSwap, it computes swap amounts using a custom bonding curve (CurveLib), deposits input tokens into and withdraws output tokens from Euler vaults (FundsLib), and returns a BeforeSwapDelta to handle all swap accounting outside of standard pool math. Native concentrated liquidity, initialization by non-factory callers, and donations are intentionally blocked.

Flags

Flag	Value
beforeInitialize	true
afterInitialize	false
beforeAddLiquidity	true
afterAddLiquidity	false
beforeRemoveLiquidity	false
afterRemoveLiquidity	false
beforeSwap	true
afterSwap	false
beforeDonate	true
afterDonate	false
beforeSwapReturnsDelta	true
afterSwapReturnsDelta	false
afterAddLiquidityReturnsDelta	false
afterRemoveLiquidityReturnsDelta	false

Properties

Property	Value
dynamicFee	false
upgradeable	false
requiresCustomSwapData	false
vanillaSwap	false
swapAccess	none

Warnings

• Submitter did not provide a name. Using AI-derived "EulerSwap".
• Submitter did not provide a description. Using AI-generated description.

Closes #7128

[github-actions]

Review: hooks/ethereum/0xfc171fd20e6fdca8e6b53e7286a1a21dc73928a8.json

Address Flags

Address 0xfc171fd20e6fdca8e6b53e7286a1a21dc73928a8 — last 14 bits are 0x28a8 & 0x3FFF = 0x28a8 (decimal 10408):

Bit	Flag	Expected	File
13	beforeInitialize	true	true ✓
12	afterInitialize	false	false ✓
11	beforeAddLiquidity	true	true ✓
10	afterAddLiquidity	false	false ✓
9	beforeRemoveLiquidity	false	false ✓
8	afterRemoveLiquidity	false	false ✓
7	beforeSwap	true	true ✓
6	afterSwap	false	false ✓
5	beforeDonate	true	true ✓
4	afterDonate	false	false ✓
3	beforeSwapReturnsDelta	true	true ✓
2	afterSwapReturnsDelta	false	false ✓
1	afterAddLiquidityReturnsDelta	false	false ✓
0	afterRemoveLiquidityReturnsDelta	false	false ✓

All flags match the address bitmask and are confirmed by getHookPermissions() in src_UniswapHook.sol.

Properties

dynamicFee: false ✓ — _beforeSwap returns fee override as 0 (literal zero, not OVERRIDE_FEE_FLAG). No calls to poolManager.updateDynamicLPFee() anywhere in the hook.

upgradeable: false ✓ — source_meta.json reports "proxy": false. The hook instances use delegatecall into this fixed implementation contract (a code-size pattern), but the implementation itself has no admin-controlled upgrade mechanism, no mutable implementation slot, and no SELFDESTRUCT. The EVC address and pool manager address are both immutable.

requiresCustomSwapData: false ✓ — _beforeSwap declares bytes calldata but never reads or decodes it; all swap logic derives from CtxLib.getParams() and params (the SwapParams struct). Swaps work with empty hookData.

vanillaSwap: false ✓ — beforeSwapReturnsDelta is true and _beforeSwap computes its own custom AMM curve (CurveLib), deposits input tokens into Euler vaults (FundsLib.depositAssets), withdraws output tokens from Euler vaults (FundsLib.withdrawAssets), and returns a non-zero BeforeSwapDelta. The swap does not execute via standard pool math at all.

swapAccess: "none" ✓ — _beforeSwap has no caller access control. The only revert conditions are the reentrancy lock and the curve invariant check (CurveLib.verify); neither gates by caller identity, time, or admin flag.

Metadata

• verifiedSource: true ✓ — confirmed by source_meta.json ("verified": true).
• chainId: 1 ✓ — matches chains.json for ethereum.
• name: "EulerSwap" ✓ — matches contractName in source_meta.json.
• description ✓ — accurately describes the on-chain behavior: custom bonding curve via CurveLib, Euler vault deposits/withdrawals via FundsLib, BeforeSwapDelta accounting, and intentional reverts on beforeInitialize (non-factory callers), beforeAddLiquidity (CLAMM positions), and beforeDonate (irrecoverable funds). No promotional, audit, or safety language.

All fields are correct.

[Ponx]

Bot review verified; bitmask/flags/properties check out. LGTM.