Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,206,111
0x0A79…60cc
The eight checks
5 pools use this hook, the first one 84 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 4% 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.
- 05pass
No one holds the switchNo owner and no admin functions found.
- 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 record5 pools over 84 days.
Measured at block 93,206,111. 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 / MIKO
fee 0%- Swap ETH → MIKOhook takes 4.00%
- Swap MIKO → ETHhook takes 4%
- Add, then remove liquiditycame back whole
pool 0xfd126d9986658e38908077008c1e52ddc8fbbf9432a98b549c471dbd02c329b2
Read from the bytecode
- Code size
- 8,494 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 1
- 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.
- 0x03c40ac8 MAX_WALLET_BUY_BPS
- 0x07721195 quoteFee
- 0x16ece402 MAX_SWAP_BPS
- 0x1d8ef3ef currentFeeBps
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
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.
0x259982e5
beforeAddLiquidity
0x33c86b26 isCapExempt0x42020d8e launchFeeBpsAt0x575e24b4 beforeSwap0x60dc2340 feeTreasury0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7748f32e isOfficialPool0x7a4d20a3 GENERIC_LAUNCH_FEE_START_BPS0x8163c7bd maxSwapAmount0x86e9ea9b quoteFeeAt0x9f063efc afterAddLiquidity0xabdced21 maxWalletBuyAmount0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb6d758e9 launchActive0xb90fa145 feeBpsAt0xbaa0fe57 GENERIC_LAUNCH_WINDOW0xbf333f2c FEE_BPS0xc15c6b8b quoteExactOutputFee0xc32353ab GENERIC_DECAY_TIME_CONSTANT0xc4e833ce getHookPermissions0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdcef3193 launchTimestamp0xdf8fbc1e poolLaunchState0xe1b4af69 afterDonate0xe6c95a7d launchPurchased0xe6e948f7 REQUIRED_HOOK_MASK0xf871c0ff quoteExactOutputFeeAt