Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,060,020
0xcD87…2AcC
The eight checks
10 pools use this hook, the first one 98 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, 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: UnauthorizedAction. Only an approved router may get through.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 0% now and can change.
- 05caution
No one holds the switchNo owner() but it has setEmergencyPaused.
- 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 record10 pools over 97 days.
Measured at block 93,060,020. 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 & 0x3fff0x2acc · 10101011001100
- 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 / TEST
fee dynamic, now 0%- Swap ETH → TESTrefused: UnauthorizedAction
- Swap TEST → ETHrefused: UnauthorizedAction
- Add, then remove liquiditydeposit refused: UnauthorizedAction
pool 0xb9752c6289314e2c5ce2157f6e6d5d2e6979913b6a6b4629329b8476cbbb734c
ETH / FLOW
fee dynamic, now 0%- Swap ETH → FLOWrefused: UnauthorizedAction
- Swap FLOW → ETHrefused: UnauthorizedAction
- Add, then remove liquiditydeposit refused: UnauthorizedAction
pool 0x3cf4449d64fa30e0c9f6c2ce8cc52dda6b3568e956832ad1116f1e739a08ea72
Read from the bytecode
- Code size
- 9,578 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 8
- 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.
- 0x19267943 AUTOMATIC_SETTLEMENT_MARKER
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x3b3e7ffd controllerFor
- 0x3d401ab9 registerPool
- 0x4e3f83f6
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 add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- Before remove liquidity. Can refuse a withdrawal. LPs may not get out.
- 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.
pendingState
0x528e33d6 markSeeded0x55b377f3 setEmergencyPaused0x575e24b4 beforeSwap0x6999b377 feeController0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x74c16b23 registryAdmin0x77fd4960 feeFromGross0x95fb9bcf phase0x9d5c988f configureRegistry0x9f063efc afterAddLiquidity0xa1e8bb69 finalizeGraduation0xab57bb6e isEmergencyPaused0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xcf57ccf4 finalizeLadder0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdf57c1ad activateBootstrap0xe1b4af69 afterDonate0xe39367e9 grossFromNet0xe5a9a338 beginGraduation0xe7cae133 tradeFeesFromGross0xf474c987 markBandSettled0xf5778b03 bootstrapAdmin0xfdbab4c9 GRADUATION_CROSSING_MARKER