Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,144,856
0xBB91…20Cc
The eight checks
7 pools use this hook, the first one 24 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.
- 02pass
What it takes from a swapIt takes 1% 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 withdrawCreatorQuote, withdrawCreatorQuoteAll.
- 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 record7 pools over 24 days.
Measured at block 93,144,856. 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 / SMILE
fee 0%- Swap ETH → SMILEhook takes 1.00%
- Swap SMILE → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xd76b0f2ac0c6b5e09122333341ddbed7045460ed73cd96cc1c865884fb4ee244
ETH / 14219
fee 0%- Swap ETH → 14219hook takes 1.00%
- Swap 14219 → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xfb6ebde195a7e16bb35627a8d7b0f1ee2cbd9ca1147c9247a1db77fa35ed96e9
Read from the bytecode
- Code size
- 17,206 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 26
- 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.
- 0x02a949b6 pendingDistributorQuote
- 0x09ad6c86 MIN_BURN_SPEND_WEI
- 0x0b92f598 pendingPlatformQuote
- 0x126082cf BASIS_POINTS_DIVISOR
- 0x1345d3fc swapTaxBps
- 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
0x536dac9b launchFactory0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x8567537c defaultSystemFeeShareBps0x9950fb7f pendingBurnQuote0x9f063efc afterAddLiquidity0xa1b9be58 withdrawCreatorQuote0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbea1dcf8 taxCollector0xc0756609 distributeBondingFee0xc45a0155 unknown0xc4e833ce getHookPermissions0xca11c411 flushFeeBurn0xd206932b accruedCreatorQuote0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xf2006559 withdrawCreatorQuoteAll0xf3ff2c0e flushPendingDistribution