Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,393,978
0xf9F4…E0Cc
The eight checks
3 pools use this hook, the first one 80 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 10% 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 record3 pools over 79 days.
Measured at block 93,393,978. 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 / test
fee 0%- Swap ETH → testhook takes 1.00%
- Swap test → ETHhook takes 10%
- Add, then remove liquiditycame back whole
pool 0x9de0d75e8223308ea8969bb3800af3c330490326b1749a4b8ed5f18dd2f95295
ETH / test
fee 0%- Swap ETH → testhook takes 1.00%
- Swap test → ETHhook takes 10%
- Add, then remove liquiditycame back whole
pool 0x8d4f26ad670f1be460ef7f06f56d599af2f320404eb61778e5b306c1e7cee07f
Read from the bytecode
- Code size
- 14,309 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 9
- 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.
- 0xe1b4af69 afterDonate
- 0xe1f1c4a7 BASIS_POINTS
- 0xe4efc564 HOLDER_THRESHOLD
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
- 0xcbaa1a47 MIN_FEE_BPS
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.
0xced9095a
registerPool
0xd103884a LAUNCHER_FEE_BPS0xd55be8c6 MAX_FEE_BPS0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xaf6da3ec SNIPER_THRESHOLD0xaf8d60b5 claimCreatorFees0x91dd7346 unlockCallback0x9ba64043 LP_FEE_PIPS0x9f063efc afterAddLiquidity0xa098cbe5 TRANSFER_TAX_BPS0x81d6da69 FEE_STEP_BPS0x85d6f1a6 effectiveFeeBpsFor0x8cd7825f poolFeeConfig0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x575e24b4 beforeSwap0x64d46b85 claimLauncherFees0x65c5de6e holderPositions0x6884ef07 claimLauncherFeesTo0x3edaf625 totalNativeFeesAccrued0x46ca626b TICK_SPACING0x4c50e2c4 launcherFeeRecipient0x37ab1a04 getHolderTier0x3a99927c rewardVaultFactory0x1497233e launcherFeesAccrued0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x29958732 WARM_THRESHOLD