Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,975,695
0xF9Cf…20cc
The eight checks
19 pools use this hook, the first one 58 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 0.05% 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 1%, written in the pool key.
- 05caution
No one holds the switchNo owner() but it has claimTreasuryFees, TRANSFER_TAX_BPS.
- 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 record19 pools over 58 days.
Measured at block 92,975,695. 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 & 0x3fff0x20cc · 10000011001100
- 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.
ROCKET / SPCX
fee 1%- Swap ROCKET → SPCXhook takes 0.05%
- Swap SPCX → ROCKEThook takes 0.05%
- Add, then remove liquiditycame back whole
pool 0x25e52cfb58b1fdc6bfcf52788d79c145ee29e161730fb0d0b362e974c2a40084
SPCX / MUSK
fee 1%- Swap SPCX → MUSKhook takes 0.05%
- Swap MUSK → SPCXhook takes 0.05%
- Add, then remove liquiditycame back whole
pool 0x9cad54b94cc0c1269d1977bd00febcc2c52efff70f37e8ddfa12aabaaa0eb48f
Read from the bytecode
- Code size
- 10,683 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0x129760a4 effectiveTreasuryFeePips
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x25d8ca52 treasuryPoolConfig
- 0x3397c2ea quoteTreasuryFeeFromGross
- 0x46ca626b
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 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.
TICK_SPACING
0x4850df56 MAXIMUM_CLAIM_AMOUNT0x575e24b4 beforeSwap0x6999b377 feeController0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7265fc91 claimTreasuryFees0x76caf6c5 registerPool0x7b103999 registry0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa098cbe5 TRANSFER_TAX_BPS0xaae49d70 PIPS_DENOMINATOR0xaea45c81 MAXIMUM_LP_FEE_PIPS0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbc8c9489 quoteTreasuryFeeForNet0xc4e833ce getHookPermissions0xc9ede2ba DEFAULT_LP_FEE_PIPS0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe801ef82 treasuryFeesAccrued