Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,328,532
0x95f1…2AcC
The eight checks
3 pools use this hook, the first one 87 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, 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.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x12c54c3b74684E271dbDD31c14673984304e4f53. Owner-style functions: setTrustedRouter, upgradeToAndCall, setFactory, UPGRADE_INTERFACE_VERSION, transferOwnership, claimAccruedFees.
- 06fail
The code cannot changeIt is a proxy. The code that runs lives at 0xF189216d0B82bE99115eDBAEFe078fdbE9603a31.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record3 pools over 87 days.
Measured at block 93,328,532. 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 & 0x3fff0x2acc · 10101011001100
- 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.
SPCX / RWM
fee 0%- Swap SPCX → RWMhook takes 1.00%
- Swap RWM → SPCXhook takes 1%
- Add, then remove liquiditydeposit refused: reverted without a reason
pool 0x8cedc328c40f72dc7ba41d68597335e8bde1a55b7c48d3c242d0160a1d1bd96a
ATI / SPCX
fee 0%- Swap ATI → SPCXhook takes 1%
- Swap SPCX → ATIhook takes 1%
- Add, then remove liquiditydeposit refused: reverted without a reason
pool 0x52cbab47b1f732bfa055b37efb74c680258fb03179e4767b26e900b1c08c78d6
Read from the bytecode
- Code size
- 17,136 bytes
- Owner
- 0x12c54c3b74684E271dbDD31c14673984304e4f53
- Proxy
- yes, code at 0xF189216d0B82bE99115eDBAEFe078fdbE9603a31
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 6
- 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.
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
- 0x26376aa8 unknown
- 0x2ed6b75d pendingTreasury
- 0x30040054 poolIdOf
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 add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- Before remove liquidity. Can refuse a withdrawal. LPs may not get out.
- 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.