Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,949,600
0xd88D…40CC
The eight checks
29 pools use this hook, the first one 47 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 1.00% 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 0.30%, written in the pool key.
- 05caution
No one holds the switchNo owner() but it has settleFees, settleAllFees.
- 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 record29 pools over 47 days.
Measured at block 92,949,600. 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 & 0x3fff0x00cc · 00000011001100
- 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.
JINQIAN / FAMI
fee 0.30%- Swap JINQIAN → FAMInothing taken
- Swap FAMI → JINQIANhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x73d61491f8a1a95ff3d2bf76880c7f86a2dcc7ec303cbed701bf1d272817660e
FAMI / YZ
fee 0.30%- Swap FAMI → YZhook takes 1.00%
- Swap YZ → FAMInothing taken
- Add, then remove liquiditycame back whole
pool 0xa56ed69aaea2c454c19d3d699ffc5dd8896a9fbef77591afa429bbabdfbbeadd
Read from the bytecode
- Code size
- 7,962 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 10
- 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.
- 0xdc98354e beforeInitialize
- 0xde6fb465 unsettledTokens
- 0xe1b4af69 afterDonate
- 0xe8614178 feesOnDay
- 0xf2539453 activePoolsOnDay
- 0xc415b95c feeCollector
- 0xcf0ac78f
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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.
feesChargedOf
0xdc1ab379 lastActiveDay0xdc4c90d3 poolManager0xb6a8b0fa beforeDonate0xb7578940 totalFeesCharged0xb9daf517 totalStockLocked0xbe378228 PROTOCOL_FEE_BPS0x9beedd1e totalUnsettledFees0x9f063efc afterAddLiquidity0xa78842ee settleFees0xb47b2fb1 afterSwap0x726877e5 unsettledFeeOf0x77cd9374 poolsEverTraded0x8549d9be REQUIRED_FLAGS0x91dd7346 unlockCallback0x93cc0b2b stockLockedOf0x5f81a57c totalVolume0x64f8caec volumeOf0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x26465937 stockCurrency0x4eec9e09 tokenizedStock0x575e24b4 beforeSwap0x5c9302c9 currentDay0x0f1d6f76 volumeOnDay0x1d38cbfe settleAllFees0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity