Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,947,818
0xd1Bc…2Ac0
The eight checks
34 pools use this hook, the first one 44 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity. The hook is allowed to take; the next two checks measure whether it does.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04pass
The fee is the feeA fixed fee of 0.00%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x705F4f94344feD3f7BA98300F8bC04fdAE570340. Owner-style functions: setDistribution, setPoolLive, setExternalDeposits, emergencyRevokeVault, transferOwnership.
- 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 record34 pools over 44 days.
Measured at block 92,947,818. 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 & 0x3fff0x2ac0 · 10101011000000
- 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.
USDe / USDG
fee 0.00%- Swap USDe → USDGno liquidity at the current price
- Swap USDG → USDeno liquidity at the current price
- Add, then remove liquiditydeposit refused: LiquidityNotAllowed
pool 0x43b2331316fec8404b11478b1fd49d230e17915d939650d116ce0954bff0f637
Read from the bytecode
- Code size
- 24,412 bytes
- Owner
- 0x705F4f94344feD3f7BA98300F8bC04fdAE570340
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 21
- 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.
- 0x01ffc9a7 supportsInterface
- 0x09cc6e54 bootstrap
- 0x11b9aa23 setDistribution
- 0x12e8d594 totalShares
- 0x1734db44 previewDeposit
- 0x1c757b95 userShares
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.