Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,034,354
0x7Aa7…A0cC
The eight checks
11 pools use this hook, the first one 76 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.
- 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 BURN_ADDRESS.
- 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 record11 pools over 75 days.
Measured at block 93,034,354. 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 / MESH
fee 0%- Swap ETH → MESHhook takes 1.00%
- Swap MESH → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xe6012d92950007067a8974599c96f27eaa012abfeaa0ec1e7d506f4062759940
ETH / MESH
fee 0%- Swap ETH → MESHhook takes 1.00%
- Swap MESH → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x37e53f5d6d575ec49204af62feba201a03330a9973d39c38bdc16639ef425701
Read from the bytecode
- Code size
- 13,800 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 13
- 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.
- 0xf29ebf61 feeRouter
- 0xf2f4d5fe supplyReport
- 0xfccc2813 BURN_ADDRESS
- 0xe51ead2e registerPool
- 0xe5dd8c5e totalBurned
- 0xdc4c90d3 poolManager
- 0xdc98354e
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.
beforeInitialize
0xe1b4af69 afterDonate0xe28ca207 buybackFromHook0xbae667bc tokenOf0xbe378228 PROTOCOL_FEE_BPS0xbe9e86db totalSpentOnBuybacks0xc4e833ce getHookPermissions0xb47b2fb1 afterSwap0xb621e75a protocolFeesAccrued0xb6a8b0fa beforeDonate0xb8c5f460 buyback0xa45effcb maxBuybackAmount0xac4d890f lastBuybackAt0xb3dbac77 flushProtocolFees0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0x5e3f2727 LP_FEE0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x81101b55 buybackReserve0x27258b22 isRegistered0x431a9caa MAX_TOTAL_FEE_BPS0x46ca626b TICK_SPACING0x575e24b4 beforeSwap0x0885f732 poolConfig0x21d0ee70 beforeRemoveLiquidity0x220923e3 buybackThreshold0x259982e5 beforeAddLiquidity