Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,458,723
0xE1B7…E0Cc
The eight checks
1 pool use this hook, the first one 22 h 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.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 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.
- 05caution
No one holds the switchNo owner() but it has transferFrom, transfer, 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.
- 08caution
Track record1 pool, first seen 0 days ago.
Measured at block 93,458,723. 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 / test
fee 0%- Swap ETH → testno liquidity at the current price
- Swap test → ETHno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x673c3bd93af16c43ce450511049e5211f2b1523df8d1231c36461fc809e3f0cc
Read from the bytecode
- Code size
- 8,038 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 4
- 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.
- 0x02a1f4d3 HOME_TICK_SPACING
- 0x03ee438c metadataURI
- 0x054b093f BIN_PACKER
- 0x054f7d9c frozen
- 0x06fdde03 name
- 0x095ea7b3 approve
- 0x18160ddd totalSupply
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.
0x21d0ee70
beforeRemoveLiquidity
0x23b872dd transferFrom0x259982e5 beforeAddLiquidity0x2e85a9ba frostLadled0x313ce567 decimals0x36569e77 vat0x3c7afc17 frostBps0x40850fa8 frostCollected0x4e8e032d bins0x51a96c6c FROST_MAX_BPS0x5207d321 BATCH0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6f4903d3 BIN_PARLOR0x6fe7e6eb afterInitialize0x70a08231 balanceOf0x715018a6 renounceOwnership0x78dd741d FROST_MIN_BPS0x7a1a61f5 bearerOf0x80b0629b ladle0x81af30b8 packer0x8da5cb5b owner0x91dd7346 unlockCallback0x95d89b41 symbol0x988bbb0f creditsBps0x9f063efc afterAddLiquidity0xa8131bd5 bin0xa9059cbb transfer0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdd2a4ad0 BIN_COOP0xdd62ed3e allowance0xdecb9861 parlor0xdf5cf745 BIN_HOUSE0xe1b4af69 afterDonate0xe608c730 coop0xf2fde38b transferOwnership0xf865a59f icebox0xff9b3acf house