Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,086,330
0xF781…20cc
The eight checks
9 pools use this hook, the first one 10 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.
- 02fail
What it takes from a swapIt took 12.72% of a 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 record9 pools over 10 days.
Measured at block 93,086,330. 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 / BLOOMAD
fee 0%- Swap ETH → BLOOMADhook takes 2.00%
- Swap BLOOMAD → ETHhook takes 13%
- Add, then remove liquiditycame back whole
pool 0xd75116ccf1711eb64982eb82cd6f1724c269eb8cb306897c9b50f0369726bb6e
Read from the bytecode
- Code size
- 7,073 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 10
- 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.
- 0x0dfa2bd1 activeCreatorBuyFeeBps
- 0x10d1266e registerLaunchWithQuote
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x2a2b5fa9 creatorSellFeeBpsOf
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.
0x4e420c09
registerLaunch
0x575e24b4 beforeSwap0x6052970c feeSplitter0x66ab383d flushFees0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7163d5ed creatorBuyFeeBpsOf0x7507a06b activeCreatorSellFeeBps0x91dd7346 unlockCallback0x9ce110d7 initializer0x9f063efc afterAddLiquidity0xa7918229 quoteAssetOf0xa844a134 MAX_CREATOR_FEE_BPS0xb2dd5c07 registered0xb47b2fb1 afterSwap0xb56c3565 deferredFees0xb6a8b0fa beforeDonate0xb7cfc9d2 quoteAssetSet0xbe378228 PROTOCOL_FEE_BPS0xc3483086 quoteIsCurrency0Of0xcc6d7a39 graduationExecutor0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1a45218 BPS_DENOMINATOR0xe1b4af69 afterDonate