Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,998,463
0xf804…e0Cc
The eight checks
16 pools use this hook, the first one 81 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 3.00% 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 claimCreatorFees, TRANSFER_TAX_BPS, claimLauncherFees, claimLauncherFeesTo.
- 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 record16 pools over 81 days.
Measured at block 92,998,463. 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.
ETH / HCAT
fee 0%- Swap ETH → HCAThook takes 2.00%
- Swap HCAT → ETHhook takes 2%
- Add, then remove liquiditycame back whole
pool 0xd50c92d972846133f7053845f13273821daa7d7cc0036424c88e4314c56e3ddc
ETH / PRIVATES
fee 0%- Swap ETH → PRIVATEShook takes 3.00%
- Swap PRIVATES → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0xd439867afb064527c52fb00b4d619cb7eda75763660f16f7541687f66ffe3f6c
Read from the bytecode
- Code size
- 12,944 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 8
- 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.
- 0xdebfa293 MAX_TOTAL_SWAP_FEE_BPS
- 0xe1b4af69 afterDonate
- 0xe1f1c4a7 BASIS_POINTS
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
- 0xb6c27662 totalSwapFeeBpsFor
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.
0xc4e833ce
getHookPermissions
0xd103884a LAUNCHER_FEE_BPS0xd6362a0c feeSplitVaultFactory0xaf8d60b5 claimCreatorFees0xb47b2fb1 afterSwap0xb4b01335 feeDisclosure0xb6a8b0fa beforeDonate0x9ba64043 LP_FEE_PIPS0x9d2786a5 quoteExactOutputFees0x9f063efc afterAddLiquidity0xa098cbe5 TRANSFER_TAX_BPS0x88fed78f MIN_TOTAL_SWAP_FEE_BPS0x8cd7825f poolFeeConfig0x91dd7346 unlockCallback0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x575e24b4 beforeSwap0x5fd07da5 registerPool0x64d46b85 claimLauncherFees0x6884ef07 claimLauncherFeesTo0x383f307e quoteGrossFees0x3edaf625 totalNativeFeesAccrued0x46ca626b TICK_SPACING0x4c50e2c4 launcherFeeRecipient0x0c835366 TOTAL_SWAP_FEE_STEP_BPS0x1497233e launcherFeesAccrued0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity