Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,268,460
0xC0d5…c0c4
The eight checks
4 pools use this hook, the first one 56 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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 switchOwned by 0xa4f388894A1dadf7f55124B253f7D2334c40970a. Owner-style functions: transferOwnership, collectorShareBps, setAllowedProviders, setAllowedProvider, setPoolChargedFee, setDefaultFeeConfig.
- 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 record4 pools over 55 days.
Measured at block 93,268,460. 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 & 0x3fff0x00c4 · 00000011000100
- 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 / TSLA
fee 0%- Swap ETH → TSLAno liquidity at the current price
- Swap TSLA → ETHno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x8beea0a32c777826666ee3ae18be20a31b3d3759fa48ff8ed4fc040fc1f0a483
Read from the bytecode
- Code size
- 12,841 bytes
- Owner
- 0xa4f388894A1dadf7f55124B253f7D2334c40970a
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 1
- 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.
- 0xe5598293 getPoolKey
- 0xe8d89ece getPoolFeeConfig
- 0xe950970c DEFAULT_SIMULATION_GAS_LIMIT
- 0xf26ef49d DYNAMIC_FEE_FLAG
- 0xf2fde38b transferOwnership
- 0xfb32939f protocolCollector
- 0xd00934ba
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.
- After swap returns delta. Can take part of what you get out of every swap.
selectFeeFromRoll
0xd40ec92a collectorShareBps0xd4fa882b primaryTierOneFee0xd73792a9 FEE_DENOMINATOR0xdc4c90d3 poolManager0xe1a45218 BPS_DENOMINATOR0xb47b2fb1 afterSwap0xb7d1a2b7 isAllowedProvider0xc3a341b5 splitFee0xc4e833ce getHookPermissions0xc594b619 setAllowedProviders0xce07d308 registerPool0x907491a2 getPoolSimulationGasLimit0x94168af8 swapCount0x9789ae80 isPoolRegistered0x9f43c63f clearFeeOverride0x9f7973b9 simulationGasLimit0xa2bb1773 unknown0x70b0a4e3 primaryPoolId0x791b98bc positionManager0x7b06fd49 setAllowedProvider0x7f354bf6 SIMULATION_GAS_BUFFER_BPS0x8a8ef0ae setPoolChargedFee0x8da5cb5b owner0x575e24b4 beforeSwap0x5a8ad6e6 setDefaultFeeConfig0x5c975abb paused0x5c9cbbea unknown0x5fbbc0d2 getFeeConfig0x63e094ad getFeeOverride0x38e42316 wouldTreatAsSimulation0x3a0d5443 setDefaultFee0x3a6d0dc0 unknown0x3b01d64d OVERRIDE_FEE_FLAG0x3e930009 setPoolFeeConfig0x3fc48eba MAX_LP_FEE0x0d3c09f7 poolConfigVersion0x128e1ac1 setSimulationGasLimit0x16c38b3c setPaused0x28b8f2bc getAllowedProviders0x2b6ad0e8 setFeeOverride0x3055c173 selectPoolFeeFromRoll