Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,458,238
0x221A…40cc
The eight checks
1 pool use this hook, the first one 22 h 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.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 1%, written in the pool key.
- 05pass
No one holds the switchNo owner and no admin functions found.
- 06caution
The code cannot changeThe bytecode contains DELEGATECALL.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08caution
Track record1 pool, first seen 0 days ago.
Measured at block 93,458,238. 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.
ETH / OLY
fee 1%- Swap ETH → OLYno liquidity at the current price
- Swap OLY → ETHno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x8a873a58085ae5738b7858b050ac1c9b376dc015aa69b53b1d01e637e870dd53
Read from the bytecode
- Code size
- 10,621 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 2
- 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.
- 0xf5d6d8a4 taxRouter
- 0xf96f97f2 observe
- 0xfbdc1ef1 states
- 0xe1b4af69 afterDonate
- 0xe3b077a1 getState
- 0xefb40e57 getObservation
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.
0xdc4c90d3
poolManager
0xdc98354e beforeInitialize0xdd71cea8 observations0xb6a8b0fa beforeDonate0xbf333f2c FEE_BPS0xc4e833ce getHookPermissions0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb55e46e5 MIN_OBS_SPACING0x6fe7e6eb afterInitialize0x8200d873 MAX_CARDINALITY0x8f1c9217 increaseCardinalityNext0x481c6a75 manager0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity