Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,113,108
0x2368…60cc
The eight checks
8 pools use this hook, the first one 25 d ago.
- 01caution
Permissions that touch your moneyThe address enables before swap returns delta, after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02caution
What it takes from a swapIt takes 4% of each swap on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchNo owner() but it has TRANSFER_TAX_BPS, claimCreatorFees, claimTreasuryFees, claimTreasuryFeesTo.
- 06pass
The code cannot changeNot a proxy, no DELEGATECALL, no SELFDESTRUCT.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record8 pools over 24 days.
Measured at block 93,113,108. A hook with an owner or a dynamic fee can behave differently later; scan again before a large trade.
What the address allows
A v4 hook's permissions are the last fourteen bits of its address. The PoolManager calls only what they switch on.
address & 0x3fff0x20cc · 10000011001100
- bit 13Before initialize
- bit 12After initialize
- bit 11Before add liquidity
- bit 10After add liquidity
- bit 9Before remove liquidity
- bit 8After remove liquidity
- bit 7Before swap
- bit 6After swap
- bit 5Before donate
What it did to a real swap
A small swap each way and a liquidity round trip, run through the PoolManager and this hook inside a call that is never sent. The pool fee is expected; anything else missing is the hook.
WETH / DCAT
fee 0%- Swap WETH → DCAThook takes 4.00%
- Swap DCAT → WETHhook takes 4%
- Add, then remove liquiditycame back whole
pool 0xd9878064a895af82fc3d018da25355d9f22abf1cda7a4507a045aaf49879c149
WETH / DRIVER
fee 0%- Swap WETH → DRIVERhook takes 1.00%
- Swap DRIVER → WETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xa80d411b4fce806bcd30a3a26e671ac441c50df1fb25f0e44f0ab9281ff6dd6a
Read from the bytecode
- Code size
- 10,666 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 3
- Callbacks open to anyone
- none
Its functions, uncensored
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.
- 0x054714a0 PLATFORM_FLOOR_BPS
- 0x10b25761 registerPool
- 0x159c6a3d effectiveFeeBpsFor
- 0x203bf9bd allocationVaultFactory
- 0x21d0ee70 beforeRemoveLiquidity
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- Before initialize. Runs once, when a pool is created.
- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- Before swap returns delta. Can take part of what you put into a swap, or change how much is swapped.
- After swap returns delta. Can take part of what you get out of every swap.
0x259982e5
beforeAddLiquidity
0x383f307e quoteGrossFees0x3c3068d2 selectedFeeBpsFor0x46ca626b TICK_SPACING0x4d6a631b MIN_DECAY_SECONDS0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7b853b11 treasuryFeesAccrued0x7d36c30c totalQuoteFeesAccrued0x82564bca quoteCurrency0x85f53116 treasuryCollector0x8b64669d openingFeeConfig0x8cd7825f poolFeeConfig0x8db76188 PLATFORM_SHARE_OF_FEE_BPS0x91dd7346 unlockCallback0x9ba64043 LP_FEE_PIPS0x9d2786a5 quoteExactOutputFees0x9f063efc afterAddLiquidity0xa098cbe5 TRANSFER_TAX_BPS0xaf8d60b5 claimCreatorFees0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xba6f26cb FEE_PRESET_STEP_BPS0xc4e833ce getHookPermissions0xd1ba24e7 claimTreasuryFees0xd246637b MAX_DECAY_SECONDS0xd6ae49e9 MAX_OPENING_SWAP_FEE_BPS0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe06ca52c MAX_BASE_SWAP_FEE_BPS0xe1b4af69 afterDonate0xe1f1c4a7 BASIS_POINTS0xf04c136a claimTreasuryFeesTo