Add BackedFeeHook hook on robinhood

[hooklist-generator]

Summary

A fee-taking hook that charges a fixed 3% swap tax in native ETH (currency0) on all swaps, routing the full fee to a vault address. Fee collection is split between beforeSwap (ETH-specified swaps) and afterSwap (ETH-unspecified swaps) using return deltas; non-ETH pools pass through untaxed.

Flags

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

Properties

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

Warnings

• Submitter did not provide a description. Using AI-generated description.

Closes #1109

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
hooklist	Ready	Preview, Comment	Jul 20, 2026 2:41pm

[github-actions]

Review: hooks/robinhood/0xced7aa50727f3cd251985b09a2080db056a8c0cc.json

Address Flags

Address suffix 0xc0cc, lowest 14 bits: 0x00cc = 11001100 binary.

Bit	Flag	Decoded	JSON
7	beforeSwap	1	true ✓
6	afterSwap	1	true ✓
5	beforeDonate	0	false ✓
4	afterDonate	0	false ✓
3	beforeSwapReturnsDelta	1	true ✓
2	afterSwapReturnsDelta	1	true ✓
1	afterAddLiquidityReturnsDelta	0	false ✓
0	afterRemoveLiquidityReturnsDelta	0	false ✓

All 14 flag bits match the address bitmask.

Source Code Verification

Contract: BackedFeeHook — verified on Robinhood chain (chainId 4663). Matches source_meta.json.

dynamicFee: false — Fixed FEE_BPS = 300 (3%). No lpFeeOverride returned from beforeSwap, no call to poolManager.updateDynamicLPFee(). ✓

upgradeable: false — vault is immutable, no proxy pattern, no delegatecall, no SELFDESTRUCT. ✓

requiresCustomSwapData: false — hookData parameter is accepted but entirely unused in both _beforeSwap and _afterSwap. Swaps work correctly with empty hookData. ✓

vanillaSwap: false — Both beforeSwapReturnsDelta and afterSwapReturnsDelta are true and the hook actively takes fees (calls poolManager.take), modifying swap behavior. Correctly set to false. ✓

swapAccess: "none" — No access control on swappers. The hooks execute unconditionally for any caller on ETH pools; non-ETH pools pass through untaxed as a guard. ✓

Metadata

• name: "BackedFeeHook" — matches contractName from verified source. No promotional language. ✓
• chainId: 4663 — matches robinhood in chains.json. ✓
• verifiedSource: true — confirmed by source_meta.json. ✓
• description — accurately describes the fixed 3% ETH fee, vault routing, beforeSwap/afterSwap split logic, and non-ETH pool passthrough. All claims substantiated by source code. ✓

All fields are correct.