PairLaunchHook on Robinhood Chain

Uniswap v4 Hook Contract 0x92aa68ffaba9097fd3558921dd438038cfee68cc on Robinhood Chain · Launchpad · Verified contract

Volume (24h)
$0.02
Value locked (TVL)
$0.02
All-time volume
$0.02
Pools using this hook
1
Swaps (24h)
1 (1 traders)
Total swaps
1

What it does

A launchpad hook that charges every trade a fixed 1% to 10% quote-token fee split between the platform and the creator, while non-exempt buyers in the first 3 seconds after launch pay a sharply higher anti-sniping fee of up to 99%.

How it works step by step

  • Runs token launch pools where each trade pays a fee in the quote token (e.g. ETH) to the platform and the token creator.
  • Normal fee is 1% plus a creator-set extra of 0% to 9%, so 1% to 10% total, on both buys and sells.
  • For the first 3 seconds after launch, non-exempt buyers pay an anti-sniping surcharge: up to 99% total in second 0, about 7.2% to 16.2% in second 1, and about 1.2% to 10.2% in second 2.
  • Only the launch locker can add liquidity, and only until the pool is activated or graduates from its bonding curve. After that adding is open; removing is never blocked.
  • Fees are held as claims in a fee vault and split between the platform and the creator (the anti-snipe portion is split roughly 50/50).
Swap behaviour
Each swap pays a fee in the quote token, taken from the input or added on top of the quote amount. The rate is 1% to 10% normally and up to 99% for non-exempt buys in the first second after launch, falling over the next two seconds. Swaps that would only partially fill an exact quote amount revert, and swaps are blocked before the pool is activated except for the factory's price-alignment step.
Liquidity behaviour
Adding liquidity is limited to the launch locker until the pool is active and any bonding-curve threshold is reached. The hook has no remove-liquidity callbacks, so LPs can always withdraw.
Fee behaviour
The fee is 0.5% for the platform plus 0.5% to 9.5% for the creator (1% to 10% total), set once at launch. Non-exempt buys in the first 3 seconds pay an extra anti-snipe fee: total capped at 99% in second 0, plus 6.18% in second 1 and 0.19% in second 2. All fees are paid in the quote token to the vault for the platform and creator to claim.
Owner & admin controls
There is no owner. The factory registers pools, sets the creator's extra fee (capped at 9%) and the exempt wallets, and activates pools; it cannot change fees after launch.

Enabled Uniswap v4 callbacks

beforeInitialize, beforeAddLiquidity, beforeSwap, afterSwap, beforeSwapReturnDelta, afterSwapReturnDelta

beforeInitialize: only lets the factory create registered pools at a preset price; beforeAddLiquidity: limits adding liquidity to the launch locker before activation or graduation; beforeSwap: works out the fee rate and charges it when the quote amount is specified; afterSwap: charges the fee on the other swap types, credits the vault, and tracks bonding-curve graduation; beforeSwapReturnDelta/afterSwapReturnDelta: take the fee from the swap amounts.

Security & trust assessment

Risk level: low (verified source, high confidence).

Who controls it: The immutable factory sets the launch settings (creator fee capped at 9% extra, exempt wallets) and controls activation and graduation. No one can raise fees after launch.

Risk to user funds: The hook takes 1% to 10% of swap value in the quote token, or up to 99% on non-exempt buys in the first second after launch. LP principal cannot be locked or drained.

Security findings

  • [medium] Anti-snipe fee up to 99% at launch: Non-exempt buys in the same second as launch pay up to 99% total, falling to about 7.2% to 16.2% in second 1 and about 1.2% to 10.2% in second 2. This schedule is hard-coded and ends after 3 seconds.
  • [info] Bounded ongoing fee: After the first 3 seconds, the fee is fixed at 1% to 10% and cannot be changed after launch.
  • [info] Only factory-approved callers get the launch discount: Exemptions apply only through the project router or a Universal Router verified by its code. Exempt buyers skip the anti-snipe surcharge, while others pay it.
  • [info] Withdrawals unrestricted: Remove-liquidity callbacks are disabled, so the hook can never block or tax withdrawals.

Contract details

Verified source
Yes (PairLaunchHook)
Compiler
solc 0.8.26+commit.8a97fa7a
Bytecode size
9,482 bytes
Upgradeable proxy
No
Detected patterns
launchpad, liquidity-management, return-delta, tax

Pools using PairLaunchHook