Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,146,712
0x858D…40c4
The eight checks
6 pools use this hook, the first one 50 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.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 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 0% now and can change.
- 05caution
No one holds the switchOwned by 0x37c29358a3C3Db381564890aE2949B11Bd6C65Cc. Owner-style functions: setPaused, paused, setExemptAddress, setTrustedRouterBatch, setTrustedRouter, setGasThreshold.
- 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 record6 pools over 50 days.
Measured at block 93,146,712. 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.
USDG / NVDA
fee dynamic, now 0%- Swap USDG → NVDAno liquidity at the current price
- Swap NVDA → USDGno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0xbdc40aceb904012f8a15a94bcb21b9c3219687cd7a100c1e5391420863afdbea
Read from the bytecode
- Code size
- 13,904 bytes
- Owner
- 0x37c29358a3C3Db381564890aE2949B11Bd6C65Cc
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 3
- 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.
- 0x048d372c splitBps
- 0x08ac6289 tierTwoFee
- 0x14724809 unknown
- 0x16c38b3c setPaused
- 0x1c21e91e unknown
- 0x21d0ee70 beforeRemoveLiquidity
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.
0x259982e5
beforeAddLiquidity
0x38759da4 gasThreshold0x403fefe5 unknown0x46904840 feeRecipient0x4b4687b5 whitelistOnly0x50e67a96 unknown0x53608258 unknown0x54b60449 unknown0x575e24b4 beforeSwap0x58ad48fd unknown0x5a6c72d0 defaultFee0x5ba9f60a unknown0x5c975abb paused0x687e2c17 trustedRouter0x698c3891 setExemptAddress0x6ada0ce6 unknown0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x73fd43e2 unknown0x7d79e7d4 unknown0x810da780 exemptAddress0x8da5cb5b owner0x94168af8 swapCount0x952e60c2 unknown0x9a50c628 tierOneFee0x9d951b3b tierThreeFee0x9f063efc afterAddLiquidity0xac807cf4 unknown0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc446726a setTrustedRouterBatch0xc45a0155 unknown0xc4e833ce getHookPermissions0xc64f5351 setTrustedRouter0xc899a6ac splitEnabled0xcb3b3ab3 setGasThreshold0xd18e3427 unknown0xd9caed12 withdraw0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdfbec3f1 unknown0xe1a45218 BPS_DENOMINATOR0xe1b4af69 afterDonate0xea05a8c6 setWhitelistOnly0xea5736af unknown0xf2fde38b transferOwnership0xf8a49c89 unknown