hood// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
import {Ownable} from '@solady/auth/Ownable.sol';
import {IPoolManager} from '@uniswap/v4-core/src/interfaces/IPoolManager.sol';
import {IHooks} from '@uniswap/v4-core/src/libraries/Hooks.sol';
import {StateLibrary} from '@uniswap/v4-core/src/libraries/StateLibrary.sol';
import {TickMath} from '@uniswap/v4-core/src/libraries/TickMath.sol';
import {BalanceDelta} from '@uniswap/v4-core/src/types/BalanceDelta.sol';
import {Currency, CurrencyLibrary} from '@uniswap/v4-core/src/types/Currency.sol';
import {PoolId, PoolIdLibrary} from '@uniswap/v4-core/src/types/PoolId.sol';
import {PoolKey} from '@uniswap/v4-core/src/types/PoolKey.sol';
import {ModifyLiquidityParams} from '@uniswap/v4-core/src/types/PoolOperation.sol';
import {LiquidityAmounts} from '@uniswap/v4-core/test/utils/LiquidityAmounts.sol';
import {PositionManager} from '@flaunch/PositionManager.sol';
import {CurrencySettler} from '@flaunch/libraries/CurrencySettler.sol';
import {BaseSubscriber} from '@flaunch/subscribers/Base.sol';
import {TickFinder} from '@flaunch/types/TickFinder.sol';
import {IBuyBackAndBurnFlay} from '@flaunch-interfaces/IBuyBackAndBurnFlay.sol';
import {IFLETH} from '@flaunch-interfaces/IFLETH.sol';
/**
* Collects ETH and flETH from external contracts and when a certain threshold is reached
* then the total amount will be spent on buying $FLAY token from a specified PoolKey and
* burning it.
*/
contract BuyBackAndBurnFlay is IBuyBackAndBurnFlay, BaseSubscriber, Ownable {
using CurrencyLibrary for Currency;
using CurrencySettler for Currency;
using PoolIdLibrary for PoolKey;
using StateLibrary for IPoolManager;
using TickFinder for int24;
/// The `dEaD` address to burn our $FLAY tokens to
address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
/// The amount of ETH that must be reached before buying $FLAY
uint public ethThreshold;
/// The FLETH contract that is used by the Flaunch protocol
IFLETH public immutable fleth;
/// The $FLAY PoolKey that we will be making buys against
PoolKey public flayPoolKey;
/// The {PoolManager} contract
IPoolManager public immutable poolManager;
/// The buy position information
PositionInfo public positionInfo;
/// Stores the last recorded ETH balance for event emissions
uint internal _storedEthBalance;
/**
* Sets our {Notifier} to parent contract to lock down calls and references our FLETH
* contract address.
*/
constructor(
address _fleth,
address _poolManager,
address _notifier
) BaseSubscriber(_notifier) {
fleth = IFLETH(_fleth);
poolManager = IPoolManager(_poolManager);
// Set our initial ETH threshold and emit the corresponding event
ethThreshold = 1 ether;
emit ThresholdUpdated(ethThreshold);
_initializeOwner(msg.sender);
}
/**
* Called when the contract is subscribed to the Notifier.
*
* We have no subscription requirements, so we can just confirm immediately.
*
* @dev This must return `true` to be subscribed.
*/
function subscribe(
bytes memory /* _data */
) public view override(BaseSubscriber, IBuyBackAndBurnFlay) onlyNotifier returns (bool) {
return true;
}
/**
* If we have reached a specific threshold of combined ETH and flETH then we make a swap
* to buy $FLAY tokens and then burn them.
*
* @dev Called when `afterSwap` is triggered.
*
* @param _key The notification key
*/
function notify(
PoolId,
/* _poolId */
bytes4 _key,
bytes calldata /* _data */
) public override(BaseSubscriber, IBuyBackAndBurnFlay) onlyNotifier {
// We only want to deal with the `afterSwap` key
if (_key != IHooks.afterSwap.selector) {
return;
}
// Find the combined balance of flETH (ETH will be converted to flETH on receipt)
uint ethBalance = fleth.balanceOf(address(this));
// If the eth balance has changed since the last time we hit this notification, then we
// want to send an updated event to notify.
// Confirm that we have surpassed the defined threshold
if (ethBalance < ethThreshold) {
// If we have not crossed the threshold, then we won't hit this check at the end of
// this function call due to exiting early. For this reason we call it within this
// conditional.
_emitEthBalance(ethBalance);
return;
}
// Confirm that we have a valid PoolKey
if (flayPoolKey.tickSpacing == 0) {
_emitEthBalance(ethBalance);
return;
}
/**
* We need to create a liquidity position that puts ETH into a position. This means
* that we will be creating a token buy position 1 tick under the current, just like
* the {BidWall} contract does.
*
* If we have an existing position then we need to withdraw from this and recreate
* the position with the combined ETH.
*/
// Check if the native token is `currency0`
bool nativeIsZero = address(fleth) == Currency.unwrap(flayPoolKey.currency0);
// If our position has already been initialized, then we need to remove any
// existing liquidity to get any earned FLAY and recover any unspent ETH.
if (positionInfo.initialized) {
// Get our existing liquidity for the position
(uint128 liquidityBefore,,) = poolManager.getPositionInfo({
poolId: flayPoolKey.toId(),
owner: address(this),
tickLower: positionInfo.tickLower,
tickUpper: positionInfo.tickUpper,
salt: ''
});
// Remove the current liquidity from our position
_modifyAndSettleLiquidity({
_tickLower: positionInfo.tickLower, _tickUpper: positionInfo.tickUpper, _liquidityDelta: -int128(liquidityBefore)
});
} else {
// Mark our position as initialized
positionInfo.initialized = true;
}
// Increase our spent balance
positionInfo.spent += ethBalance;
// If we have any FLAY tokens held in our contract, then we want to burn them
Currency flayToken = (nativeIsZero) ? flayPoolKey.currency1 : flayPoolKey.currency0;
uint tokenBalance = flayToken.balanceOfSelf();
if (tokenBalance != 0) {
flayToken.transfer(BURN_ADDRESS, tokenBalance);
positionInfo.burned += tokenBalance;
emit BurnBabyBurn(tokenBalance);
}
// Get the current tick from the pool
(, int24 currentTick,,) = poolManager.getSlot0(flayPoolKey.toId());
// Determine a base tick just outside of the current tick
int24 baseTick = nativeIsZero ? currentTick + 1 : currentTick - 1;
// Calculate the new tick range and liquidity values
int24 newTickLower;
int24 newTickUpper;
uint128 liquidityDelta;
if (nativeIsZero) {
newTickLower = baseTick.validTick(false);
newTickUpper = newTickLower + TickFinder.TICK_SPACING;
liquidityDelta = LiquidityAmounts.getLiquidityForAmount0({
sqrtPriceAX96: TickMath.getSqrtPriceAtTick(newTickLower),
sqrtPriceBX96: TickMath.getSqrtPriceAtTick(newTickUpper),
amount0: ethBalance
});
} else {
newTickUpper = baseTick.validTick(true);
newTickLower = newTickUpper - TickFinder.TICK_SPACING;
liquidityDelta = LiquidityAmounts.getLiquidityForAmount1({
sqrtPriceAX96: TickMath.getSqrtPriceAtTick(newTickLower),
sqrtPriceBX96: TickMath.getSqrtPriceAtTick(newTickUpper),
amount1: ethBalance
});
}
// Modify the liquidity to add our position
_modifyAndSettleLiquidity({_tickLower: newTickLower, _tickUpper: newTickUpper, _liquidityDelta: int128(liquidityDelta)});
// Update the position tick range
positionInfo.tickLower = newTickLower;
positionInfo.tickUpper = newTickUpper;
// After modifying liquidity, check our updated ETH balance
_emitEthBalance(fleth.balanceOf(address(this)));
}
/**
* Updates the ETH threshold that must be reached to trigger a buy back.
*
* @dev This can only be called by the contract Owner.
*
* @param _ethThreshold The new ETH threshold
*/
function setEthThreshold(
uint _ethThreshold
) public onlyOwner {
ethThreshold = _ethThreshold;
emit ThresholdUpdated(_ethThreshold);
}
/**
* Updates the $FLAY PoolKey that actions the swap.
*
* @dev This can only be called by the contract Owner.
*
* @param _poolKey The new ETH threshold
*/
function setPoolKey(
PoolKey memory _poolKey
) public onlyOwner {
flayPoolKey = _poolKey;
emit PoolKeyUpdated(_poolKey);
}
/**
* This function will only be called by other functions via the PositionManager, which will already
* hold the Uniswap V4 PoolManager key. It is for this reason we can interact openly with the
* Uniswap V4 protocol without requiring a separate callback.
*
* @param _tickLower The lower tick of our BidWall position
* @param _tickUpper The upper tick of our BidWall position
* @param _liquidityDelta The liquidity delta modifying the position
*/
function _modifyAndSettleLiquidity(
int24 _tickLower,
int24 _tickUpper,
int128 _liquidityDelta
) internal {
(BalanceDelta delta_,) = poolManager.modifyLiquidity({
key: flayPoolKey,
params: ModifyLiquidityParams({tickLower: _tickLower, tickUpper: _tickUpper, liquidityDelta: _liquidityDelta, salt: ''}),
hookData: ''
});
if (delta_.amount0() < 0) {
flayPoolKey.currency0.settle(poolManager, address(this), uint128(-delta_.amount0()), false);
} else if (delta_.amount0() > 0) {
poolManager.take(flayPoolKey.currency0, address(this), uint128(delta_.amount0()));
}
if (delta_.amount1() < 0) {
flayPoolKey.currency1.settle(poolManager, address(this), uint128(-delta_.amount1()), false);
} else if (delta_.amount1() > 0) {
poolManager.take(flayPoolKey.currency1, address(this), uint128(delta_.amount1()));
}
}
/**
* Checks the flETH balance held by the contract and emits an event if it has changed.
*/
function _emitEthBalance(
uint _ethBalance
) internal {
if (_ethBalance == _storedEthBalance) {
return;
}
// Update our internally stored ETH balance and emit our event
_storedEthBalance = _ethBalance;
emit EthBalanceUpdated(_ethBalance);
}
/**
* The contract should be able to receive ETH from any source.
*/
receive() external payable {
// Convert any ETH that we receive into FLETH
fleth.deposit{value: msg.value}(0);
}
}[
{
"type": "constructor",
"inputs": [
{
"name": "_fleth",
"type": "address",
"internalType": "address"
},
{
"name": "_poolManager",
"type": "address",
"internalType": "address"
},
{
"name": "_notifier",
"type": "address",
"internalType": "address"
}
],
"stateMutability": "nonpayable"
},
{
"name": "AlreadyInitialized",
"type": "error",
"inputs": []
},
{
"name": "InvalidNotifier",
"type": "error",
"inputs": [
{
"name": "_sender",
"type": "address",
"internalType": "address"
},
{
"name": "_validNotifier",
"type": "address",
"internalType": "address"
}
]
},
{
"name": "NewOwnerIsZeroAddress",
"type": "error",
"inputs": []
},
{
"name": "NoHandoverRequest",
"type": "error",
"inputs": []
},
{
"name": "Unauthorized",
"type": "error",
"inputs": []
},
{
"name": "BurnBabyBurn",
"type": "event",
"inputs": [
{
"name": "_flayBurned",
"type": "uint256",
"indexed": false,
"internalType": "uint256"
}
],
"anonymous": false
},
{
"name": "EthBalanceUpdated",
"type": "event",
"inputs": [
{
"name": "_ethBalance",
"type": "uint256",
"indexed": false,
"internalType": "uint256"
}
],
"anonymous": false
},
{
"name": "OwnershipHandoverCanceled",
"type": "event",
"inputs": [
{
"name": "pendingOwner",
"type": "address",
"indexed": true,
"internalType": "address"
}
],
"anonymous": false
},
{
"name": "OwnershipHandoverRequested",
"type": "event",
"inputs": [
{
"name": "pendingOwner",
"type": "address",
"indexed": true,
"internalType": "address"
}
],
"anonymous": false
},
{
"name": "OwnershipTransferred",
"type": "event",
"inputs": [
{
"name": "oldOwner",
"type": "address",
"indexed": true,
"internalType": "address"
},
{
"name": "newOwner",
"type": "address",
"indexed": true,
"internalType": "address"
}
],
"anonymous": false
},
{
"name": "PoolKeyUpdated",
"type": "event",
"inputs": [
{
"name": "_poolKey",
"type": "tuple",
"indexed": false,
"components": [
{
"name": "currency0",
"type": "address",
"internalType": "Currency"
},
{
"name": "currency1",
"type": "address",
"internalType": "Currency"
},
{
"name": "fee",
"type": "uint24",
"internalType": "uint24"
},
{
"name": "tickSpacing",
"type": "int24",
"internalType": "int24"
},
{
"name": "hooks",
"type": "address",
"internalType": "contract IHooks"
}
],
"internalType": "struct PoolKey"
}
],
"anonymous": false
},
{
"name": "ThresholdUpdated",
"type": "event",
"inputs": [
{
"name": "_ethThreshold",
"type": "uint256",
"indexed": false,
"internalType": "uint256"
}
],
"anonymous": false
},
{
"name": "BURN_ADDRESS",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "address",
"internalType": "address"
}
],
"stateMutability": "view"
},
{
"name": "cancelOwnershipHandover",
"type": "function",
"inputs": [],
"outputs": [],
"stateMutability": "payable"
},
{
"name": "completeOwnershipHandover",
"type": "function",
"inputs": [
{
"name": "pendingOwner",
"type": "address",
"internalType": "address"
}
],
"outputs": [],
"stateMutability": "payable"
},
{
"name": "ethThreshold",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "flayPoolKey",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "currency0",
"type": "address",
"internalType": "Currency"
},
{
"name": "currency1",
"type": "address",
"internalType": "Currency"
},
{
"name": "fee",
"type": "uint24",
"internalType": "uint24"
},
{
"name": "tickSpacing",
"type": "int24",
"internalType": "int24"
},
{
"name": "hooks",
"type": "address",
"internalType": "contract IHooks"
}
],
"stateMutability": "view"
},
{
"name": "fleth",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "address",
"internalType": "contract IFLETH"
}
],
"stateMutability": "view"
},
{
"name": "notifier",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "address",
"internalType": "address"
}
],
"stateMutability": "view"
},
{
"name": "notify",
"type": "function",
"inputs": [
{
"name": "",
"type": "bytes32",
"internalType": "PoolId"
},
{
"name": "_key",
"type": "bytes4",
"internalType": "bytes4"
},
{
"name": "",
"type": "bytes",
"internalType": "bytes"
}
],
"outputs": [],
"stateMutability": "nonpayable"
},
{
"name": "owner",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "result",
"type": "address",
"internalType": "address"
}
],
"stateMutability": "view"
},
{
"name": "ownershipHandoverExpiresAt",
"type": "function",
"inputs": [
{
"name": "pendingOwner",
"type": "address",
"internalType": "address"
}
],
"outputs": [
{
"name": "result",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "poolManager",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "address",
"internalType": "contract IPoolManager"
}
],
"stateMutability": "view"
},
{
"name": "positionInfo",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "initialized",
"type": "bool",
"internalType": "bool"
},
{
"name": "tickLower",
"type": "int24",
"internalType": "int24"
},
{
"name": "tickUpper",
"type": "int24",
"internalType": "int24"
},
{
"name": "spent",
"type": "uint256",
"internalType": "uint256"
},
{
"name": "burned",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "renounceOwnership",
"type": "function",
"inputs": [],
"outputs": [],
"stateMutability": "payable"
},
{
"name": "requestOwnershipHandover",
"type": "function",
"inputs": [],
"outputs": [],
"stateMutability": "payable"
},
{
"name": "setEthThreshold",
"type": "function",
"inputs": [
{
"name": "_ethThreshold",
"type": "uint256",
"internalType": "uint256"
}
],
"outputs": [],
"stateMutability": "nonpayable"
},
{
"name": "setPoolKey",
"type": "function",
"inputs": [
{
"name": "_poolKey",
"type": "tuple",
"components": [
{
"name": "currency0",
"type": "address",
"internalType": "Currency"
},
{
"name": "currency1",
"type": "address",
"internalType": "Currency"
},
{
"name": "fee",
"type": "uint24",
"internalType": "uint24"
},
{
"name": "tickSpacing",
"type": "int24",
"internalType": "int24"
},
{
"name": "hooks",
"type": "address",
"internalType": "contract IHooks"
}
],
"internalType": "struct PoolKey"
}
],
"outputs": [],
"stateMutability": "nonpayable"
},
{
"name": "subscribe",
"type": "function",
"inputs": [
{
"name": "",
"type": "bytes",
"internalType": "bytes"
}
],
"outputs": [
{
"name": "",
"type": "bool",
"internalType": "bool"
}
],
"stateMutability": "view"
},
{
"name": "transferOwnership",
"type": "function",
"inputs": [
{
"name": "newOwner",
"type": "address",
"internalType": "address"
}
],
"outputs": [],
"stateMutability": "payable"
},
{
"name": "unsubscribe",
"type": "function",
"inputs": [],
"outputs": [],
"stateMutability": "nonpayable"
},
{
"type": "receive",
"stateMutability": "payable"
}
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| Token | Symbol | Balance | Price | Value |
|---|---|---|---|---|
| no token holdings | ||||
| Transaction Hash | Method | Block | Age | From | To | Type | Item | ||
|---|---|---|---|---|---|---|---|---|---|
| no NFT transfers for this address yet | |||||||||
| Txn Hash | Age | Event | Topics / Data |
|---|---|---|---|
| 0x93e33d…35dabf | 30 days agoFri, 17 Jul 2026 10:13:58 UTC | 0xadfa8e…e171 | data: 0x000000000000000000…107a4000 |
| 0x59670e…541045 | 30 days agoFri, 17 Jul 2026 10:13:57 UTC | 0x8be007…57e0 | [0] 0x000000000000…00000000 [1] 0x000000000000…9fd0a973 |
| 0x59670e…541045 | 30 days agoFri, 17 Jul 2026 10:13:57 UTC | 0xadfa8e…e171 | data: 0x000000000000000000…a7640000 |
| Transaction Hash | Method | Block | Age | From | To | Amount | Token | ||
|---|---|---|---|---|---|---|---|---|---|
| no token transfers for this address yet | |||||||||
| Type | Age | Block | Details |
|---|---|---|---|
| no cross-chain L1↔L2 transactions for this address | |||
| Transaction Hash | Method ? | Block | Age | From | To | Amount | Txn Fee ? | ||
|---|---|---|---|---|---|---|---|---|---|
| 0x93e33d…35dabf | setEthThreshold | 12,038,982 | 30 days agoFri, 17 Jul 2026 10:13:58 UTC | 0xb8a7…a973 | IN | BuyBackAndBurnFlay | $0.000 ETH | 0.00000228 |
| Block | Age | Parent Transaction Hash | Type | Method | From | To | Value | |
|---|---|---|---|---|---|---|---|---|
| no internal transactions found for this address yet (traced blocks + on-demand) | ||||||||