Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,327,917
0xD2EA…70CC
The eight checks
3 pools use this hook, the first one 90 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.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 1% now and can change.
- 05caution
No one holds the switchNo owner() but it has updateBeneficiary.
- 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 record3 pools over 89 days.
Measured at block 93,327,917. 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 & 0x3fff0x30cc · 11000011001100
- 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.
HOODSPY / SPY
fee dynamic, now 1%- Swap HOODSPY → SPYhook takes 1%
- Swap SPY → HOODSPYhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0xbff8781c6deb75161cd2b8d3f7999aaedd8440a35aa0c11f5a207f2bc73dec3f
SPYCY / SPY
fee dynamic, now 1%- Swap SPYCY → SPYhook takes 1%
- Swap SPY → SPYCYhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x09009de8d7e687f6ffaa2c5a782bf669f9172f2dd8cbb0f55731fc6d07d5ff96
Read from the bytecode
- Code size
- 14,650 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.
- 0x037aadbe getPoolConfig
- 0x0b69effc pendingBuybackRawSpy
- 0x12a70ae3 totalRawSpyFeesAccrued
- 0x15424b08 INITIAL_TICK
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
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.
- After initialize. Runs once, right after 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.