FulcrumLaunchHook

Robinhood

FulcrumLaunchHook is a Uniswap v4 hook on Robinhood Chain. Runs code on every swap. Can take tokens from swaps. Runs at pool creation.

Contract name: FulcrumLaunchHook

0x29fdebc7382cfb400731aa2f62ff79f464e4e0cc First pool 11 Nov 2026View on explorer

Launch a pool with this hook

CBe carefulNot in Uniswap’s hook registry · Can take tokens out of swaps?

Pools

Last new pool

Code size

13,192 B

How this hook works

Trading tax

A trading tax hook. It takes a tax on trades, keeps a price record and only lets approved callers create pools.

Takes a tax on trades

On top of the normal pool fee, it keeps part of each trade as a tax. Buys and sells can be charged differently.

The code that does this (beforeSwap):

function beforeSwap(address sender, PoolKey calldata key, IPoolManager.SwapParams calldata params, bytes calldata data)
    external
    onlyPoolManager
    returns (bytes4, BeforeSwapDelta, uint24)
{
    _requirePool(key);
    if (!initialized) revert UninitializedPool();
    if (swapActive) revert ReentrantSwap();
    if (params.amountSpecified == 0) revert NoTrade();
    if (module.codehash != moduleCodeHash) revert ModuleCodeChanged();
    _accumulate();
    swapActive = true;
    activeSwap = keccak256(abi.encode(sender, key, params, data));
    if (params.zeroForOne && block.timestamp < FulcrumToken(token).startedAt() + 300) {
        activeBuyer = LaunchProtectionModule(module).protectedBuyer(sender);
    }
    activeOpeningTaxPpm = params.zeroForOne ? LaunchProtectionModule(module).openingTaxPpmForSender(sender) : 0;
    bool nativeIsSpecified = params.zeroForOne == (params.amountSpecified < 0);
    if (!nativeIsSpecified) return (IHooks.beforeSwap.selector, BeforeSwapDeltaLibrary.ZERO_DELTA, 0);
    uint256 nativeAmount = _absolute(params.amountSpecified);
    (uint256 gross, uint256 platformFee, uint256 creatorFee, uint256 openingTax) = _quoteTradeFees(
        nativeAmount, params.amountSpecified > 0, params.zeroForOne, activeOpeningTaxPpm, sender == buyback
    );
    uint256 total = platformFee + creatorFee + openingTax;
    if (params.amountSpecified < 0 && total >= nativeAmount) revert NoTrade();
    expectedNativePoolAmount = params.amountSpecified > 0 ? gross : nativeAmount - total;
    if (expectedNativePoolAmount == 0) revert NoTrade();
    _accrue(sender, key, params.zeroForOne, gross, platformFee, creatorFee, openingTax);
    return (IHooks.beforeSwap.selector, toBeforeSwapDelta(total.toInt256().toInt128(), 0), 0);
}

Keeps a price record

It records the pool’s price over time, so other apps can read a fair average price.

The code that does this (beforeInitialize):

function beforeInitialize(address sender, PoolKey calldata key, uint160 price)
    external
    onlyPoolManager
    returns (bytes4)
{
    _requirePool(key);
    if (initialized || sender != initializer || price != initialSqrtPriceX96) revert UnauthorizedInitializer();
    initialized = true;
    uint32 t = uint32(block.timestamp);
    lastTick = TickMath.getTickAtSqrtPrice(price);
    lastTime = t;
    observations[0] = Observation(t, 0);
    obsCount = 1;
    return IHooks.beforeInitialize.selector;
}

Only approved callers create pools

New pools with this hook can only be created by approved callers, for example its own factory or launcher.

The code that does this (beforeInitialize):

function beforeInitialize(address sender, PoolKey calldata key, uint160 price)
    external
    onlyPoolManager
    returns (bytes4)
{
    _requirePool(key);
    if (initialized || sender != initializer || price != initialSqrtPriceX96) revert UnauthorizedInitializer();
    initialized = true;
    uint32 t = uint32(block.timestamp);
    lastTick = TickMath.getTickAtSqrtPrice(price);
    lastTime = t;
    observations[0] = Observation(t, 0);
    obsCount = 1;
    return IHooks.beforeInitialize.selector;
}

Who controls it: Nobody. The hook has no admin functions, and the code cannot be changed.

Based on the hook’s published code.

Safety report

Before you build on it. Automated checks, not an audit

5 to review3 passed1 unknown

Contract

✓Code is fixedNo proxy, so the code that runs today is the code that runs tomorrow.

✓No admin key foundIt has no owner wallet, so the hook developer has no single key to change its rules (as far as the standard check goes).

✓Source code publishedThe code on the block explorer matches what's deployed (contract: FulcrumLaunchHook).

Pools3 to review

!Pools don’t trade in Uniswap’s app yetIt runs code on swaps, so Uniswap’s app only routes it once Uniswap Labs approves it, and it isn’t approved yet. Adding liquidity still works, and other apps can trade it.

!Can reject swapsIt runs on every trade and can block it. Used for things like launch limits and start times.

!Can change swap amountsIt has return-delta permissions, so it can take or add tokens in every trade (taxes, fees, burns, custom curves). Check where that value goes and who controls it.

Track record2 to review

!Not in Uniswap’s hook registryNot listed by Uniswap Labs, so nobody outside the hook developer has looked at it. Most abandoned and malicious hooks are unlisted.

!Brand newIts first pool was created less than a day ago, so it has no track record. Prefer proven hooks for a real launch.

?No audit linkedNothing in the registry. Ask the hook developer for one or review the source yourself.

What it can do

Runs code on every swap

Its code executes inside each trade in pools that use it.

Can take tokens from swaps

It can take or add tokens during a swap. Fees, burns and custom curves work this way, and so do scams.

Runs at pool creation

It runs when a pool is created, often to lock in that pool’s settings.

Hook history

Took its fee from a trade 1 time
Latest transactions
- 0x371f1e0b…a3d3c2 block 111,938,019
See every one on the explorer ↗

Counted from what the hook recorded on-chain across all its pools, for every action in its published code, plus token transfers in and out of it.

Pools

1 total

PairCreatedTrades · 7dPool ID

ETH / FULC 1h 1 trades · 7d 0x9e35…1c9e Tx ↗