What is a Uniswap v4 hook on Elysium?
What a hook is
A v4 pool names its hook in its pool key, and the hook's address carries the permissions it runs with. The PoolManager then calls the hook at those points. That is how a hook can price a swap, take a fee at the pool, or hold liquidity, with no change to the token.
What the chain shows
| Item | Read |
|---|---|
| Chain id | 99901, from eth_chainId. Elysium's docs publish ids and addresses at launch. |
| v4 PoolManager | 0xE2e105d3F7209A9DA11f83cCf3E7398a753823F1. 24,009 bytes, the same code as Ethereum's once its own address is masked. |
| Pools and hooks | 12,133 pools and 46 non-zero hooks at block 1,620,636. |
| Protocol fee | protocolFeeController reads zero, so no v4 protocol fee is active. The owner can change that. |
Dates
Public mainnet is announced for Nov 9, 2026. HyperCore read and write follow about four weeks later. Elysium's docs say specs and timelines may change.
Where a hook stops
A hook runs on swaps through its pool. A token that moves to a HyperCore spot book trades on that book, and those trades do not pass through the hook.
UNTOLL's hook
UNTOLL is a Uniswap v4 hook that gives a token a payroll: 25 percent of its pool fees go to a crew the creator names and can replace on 72 hours' public notice. Deployment target: Elysium. Deployed on Robinhood Chain testnet (chain 46630): see the contracts.