Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,118,361
0x2b73…60cC
The eight checks
8 pools use this hook, the first one 64 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.
- 02caution
What it takes from a swapIt takes 2.00% of each swap 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 switchNo owner() but it has setFactory, settleFees.
- 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 record8 pools over 63 days.
Measured at block 93,118,361. 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.
ETH / OMNA
fee 0%- Swap ETH → OMNAhook takes 2.00%
- Swap OMNA → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x0f1ec272383306b3e95f30f94f601f1b6bc0f0ff89f29b3dc3f4827ebbb37e16
ETH / EQUIZONE
fee 0%- Swap ETH → EQUIZONEhook takes 1.00%
- Swap EQUIZONE → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0xf7e5a478e992653910e0806bfd564d213cc01cba1fc1c1804745a947b68cb970
Read from the bytecode
- Code size
- 15,904 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.
- 0xed00d33c EARLY_TAX_BPS
- 0xf143f192 registerPool
- 0xf4099811 isWhitelisted
- 0xddbf413a startLaunch
- 0xe1b4af69 afterDonate
- 0xcc08ccc6 EARLY_DURATION
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.
0xd2f4193b
REQUIRED_POOL_LP_FEE
0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc45a0155 unknown0xc4e833ce getHookPermissions0x976ba7f8 finalizeLaunch0x9acda3bb trustedRouter0x9f063efc afterAddLiquidity0xac4e4054 REQUIRED_HOOK_FLAGS0x9307f2c8 currentTax0x95f61c48 MAX_WHITELIST0x968ff535 MIN_BASE_TAX_BPS0x786e0838 bootstrapper0x91dd7346 unlockCallback0x5bb47808 setFactory0x61dcfd82 settleFees0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x259982e5 beforeAddLiquidity0x2b76b49c launchState0x571b1f8a WHITELIST_DURATION0x575e24b4 beforeSwap0x023cda03 MAX_BASE_TAX_BPS0x06832117 isRegisteredFeeVault0x2103e6ba whitelistMembers0x21d0ee70 beforeRemoveLiquidity