Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,116,401
0xe6D1…E0CC
The eight checks
11 pools use this hook, the first one 42 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 swapEvery swap through it was refused: InvalidRouter. Only an approved router may get through.
- 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 record11 pools over 41 days.
Measured at block 93,116,401. 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 / PT01
fee 0%- Swap ETH → PT01refused: InvalidRouter
- Swap PT01 → ETHrefused: InvalidRouter
- Add, then remove liquiditycame back whole
pool 0xcb54f55db5a2e8aa211554efc5ac6c85ee81dfcc8442ddb22a436fb1b6444584
ETH / vCat
fee 0%- Swap ETH → vCatrefused: InvalidRouter
- Swap vCat → ETHrefused: InvalidRouter
- Add, then remove liquiditycame back whole
pool 0xeca1e6922c02cf1a61fd0207aef0fe7e1069a981e754b431dac35d7a43502e66
Read from the bytecode
- Code size
- 15,968 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 7
- 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.
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
- 0xe1b4af69 afterDonate
- 0xc4e833ce getHookPermissions
- 0xdc4c79be recipeOf
- 0xb6a8b0fa beforeDonate
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.
0xbcc78933
quoteExactOutputFees
0xbd8818cd routerOf0xbe378228 PROTOCOL_FEE_BPS0xa844a134 MAX_CREATOR_FEE_BPS0xb17ab03d ensureRuntime0xb47b2fb1 afterSwap0x9ba64043 LP_FEE_PIPS0x9f063efc afterAddLiquidity0x76f80ebe previewRecipe0x7b103999 registry0x8137f0c9 AUTHOR_POOL_FEE_BPS0x8b17d6d4 MAX_MODULE_FAMILIES0x67e973ee eligibilitySnapshot0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x575e24b4 beforeSwap0x66ac3eff launchKeyOf0x46ca626b TICK_SPACING0x539d441b MAX_MODULE_INSTANCES0x54d75aa6 runtime0x56397c35 ledger0x259982e5 beforeAddLiquidity0x3d231677 registerPool0x3ec50713 feeComponents0x21d0ee70 beforeRemoveLiquidity0x226d63ae ECONOMICS_POLICY_ID0x0885f732 poolConfig0x0b9e364f CREATOR_FEE_STEP_BPS0x138c70d4 runtimeFactory0x181d590c quoteGrossFees