Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,892,006
0x9458…40c4
The eight checks
526 pools use this hook, the first one 89 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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 switchOwned by 0x06f89284b88FfCef7e1893604489552b249697e3. Owner-style functions: setTrustedRouter, setTreasury, transferFrom, transfer, claimHolderFees.
- 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 record526 pools over 88 days.
Measured at block 92,892,006. 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 & 0x3fff0x00c4 · 00000011000100
- 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 / QQQMEME2
fee 0%- Swap ETH → QQQMEME2hook takes 1%
- Swap QQQMEME2 → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x381f4dd1c8c46dfd72b9c0ba7e2679c81c1ac981f1faa01999a33908c9620823
ETH / HOODQQQ3
fee 0%- Swap ETH → HOODQQQ3hook takes 1%
- Swap HOODQQQ3 → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x0413f1ce9ed837545af7adfff3c85523d8e976b55eec2e1d266544a91fb9b0d4
Read from the bytecode
- Code size
- 20,026 bytes
- Owner
- 0x06f89284b88FfCef7e1893604489552b249697e3
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 33
- 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.
- 0x21c16334 createToken
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x46ca626b TICK_SPACING
- 0x474a6111 unknown
- 0x4da38db4 unknown
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.
- After swap returns delta. Can take part of what you get out of every swap.