Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,892,665
0xb884…00CC
The eight checks
519 pools use this hook, the first one 72 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 30% 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 record519 pools over 71 days.
Measured at block 92,892,665. 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 & 0x3fff0x00cc · 00000011001100
- 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 / BLAP
fee 0%- Swap ETH → BLAPhook takes 5.00%
- Swap BLAP → ETHhook takes 30%
- Add, then remove liquiditycame back whole
pool 0xb0825d7e42bd2605721c1024b1a00f1fa2c8da6744846911946c6bff0787ac03
ETH / LOSER
fee 0%- Swap ETH → LOSERhook takes 4.00%
- Swap LOSER → ETHhook takes 30%
- Add, then remove liquiditycame back whole
pool 0xbbf828c982a68b69f83c996ad97bcfdeff55c25aca4d2662781e307523013820
Read from the bytecode
- Code size
- 8,593 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 2
- 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.
- 0x023cda03 MAX_BASE_TAX_BPS
- 0x08ca420b SELL_TIER8_BPS
- 0x1a03ab15 registerLaunch
- 0x1aa5b318 POST_SNIPE_SELL_BPS
- 0x1f2d8550 launches
- 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.
- 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
0x317a00bb BUY_TIER6_BPS0x4b478282 POST_SNIPE_SELL_COUNT0x4e01f338 SELL_TIER3_BPS0x575e24b4 beforeSwap0x632e081f SELL_CYCLE_LEN0x65d9968f BUY_TIER5_BPS0x68288049 BUY_TIER3_BPS0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x70e9d244 feeLocker0x774cff2d SELL_TIER6_BPS0x802c397a SELL_TIER7_BPS0x8da10869 SNIPE_WINDOW_SECONDS0x8e79acfd SNIPE_TAX_BPS0x8fdd6751 tokenForPool0x95f61c48 MAX_WHITELIST0x968ff535 MIN_BASE_TAX_BPS0x9f063efc afterAddLiquidity0xa02187f2 BUY_TIER4_BPS0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc18b49d3 BUY_CYCLE_LEN0xc45a0155 unknown0xc4e833ce getHookPermissions0xda605bf7 SELL_TIER5_BPS0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe1f1c4a7 BASIS_POINTS0xf4099811 isWhitelisted0xfad260dc SELL_TIER4_BPS