LiquidityLocker

When a curve graduates, the full-range Uniswap v4 position it mints is owned by LiquidityLocker, and the locker has no code path that decreases liquidity, burns or transfers a position. Liquidity seeded at graduation is therefore locked for as long as the chain runs; the swap fees the position earns can be collected by anyone to the protocol’s fee collector. Source: contracts/src/launch/LiquidityLocker.sol (IERC721Receiver, Ownable2Step, ReentrancyGuard). One locker per chain, set on the factory (LaunchFactory.locker()); address in Addresses.

Interface

IPositionManager public immutable posm;
address public feeCollector;

function setFeeCollector(address c) external onlyOwner;       // ZeroAddress for 0x0
function collect(uint256 tokenId) external nonReentrant;       // permissionless
function onERC721Received(address, address, uint256, bytes calldata) external pure returns (bytes4);

collect(tokenId) reads the position’s pool key from the PositionManager and submits two actions in one modifyLiquidities call: DECREASE_LIQUIDITY with liquidity = 0 and both minimum amounts 0, followed by TAKE_PAIR of currency0 and currency1 to feeCollector. A zero-liquidity decrease is how Uniswap v4 realises accrued fees without touching the principal; TAKE_PAIR then pays them out. Anyone can call it for any position the locker owns; the deadline is the current block timestamp. Emits FeesCollected(tokenId, feeCollector). setFeeCollector changes where future collections are paid (FeeCollectorSet(feeCollector)). The deploy script sets it to FEE_COLLECTOR, the deployer by default. onERC721Received returns the selector so the PositionManager can mint positions to the locker.

What it cannot do

Decrease liquidity by any non-zero amount: the amount is a hard-coded 0 in collect, and no other function calls modifyLiquidities.
Transfer or burn a position: there is no transferFrom, safeTransferFrom or burn call anywhere in the contract, and it holds no approvals.
Be upgraded: it is a plain contract with an immutable posm.

The owner’s only powers are setFeeCollector and the Ownable2Step transfer. The position principal is out of everyone’s reach, including the owner and the creator of the launch.

Fee destination

Fees arrive in both pool currencies: the launch token and its quote asset (the dollar, EURC or a synthetic such as wINR). They go to feeCollector, not to the launch creator; creators earn their share of the curve’s trading fee only (see BondingCurve and Fees).

Reading a locked position

import { bondingCurveAbi, stateViewAbi } from "@launchpad/abis";

const poolId = await client.readContract({ address: curve, abi: bondingCurveAbi, functionName: "poolId" });
const positionTokenId = await client.readContract({ address: curve, abi: bondingCurveAbi, functionName: "positionTokenId" });
const [sqrtPriceX96, tick] = await client.readContract({ address: stateView, abi: stateViewAbi, functionName: "getSlot0", args: [poolId] });
const liquidity = await client.readContract({ address: stateView, abi: stateViewAbi, functionName: "getLiquidity", args: [poolId] });

Converting sqrtPriceX96 into a quote-per-token price is shown in Launch lifecycle. The PositionManager’s ownerOf(positionTokenId) returns the locker. contracts/test/BondingCurve.t.sol (test_graduate_seedsLockedPoolAtCurvePrice and the EUR and six-decimal variants) asserts that the position is owned by the locker after graduation.

Overview

Contracts

Integrate

Interface

What it cannot do

Fee destination

Reading a locked position

​Interface

​What it cannot do

​Fee destination

​Reading a locked position

Interface

What it cannot do

Fee destination

Reading a locked position