ZugChain Just Deployed a Full Uniswap V4 Stack — Here’s What That Means

The most advanced decentralized exchange infrastructure is now live on ZugChain Testnet. Natively.

A New Chapter for ZugChain DeFi

When we set out to build ZugChain, we didn’t want to settle for a basic DEX fork or a half-implemented AMM. We wanted the real thing — the most capable, battle-tested, and future-proof decentralized exchange protocol in existence.

That’s why today, we’re proud to announce that Uniswap V4 is fully deployed on ZugChain Testnet (Chain ID: 824642).

Not a fork. Not a simplified version. The complete, unmodified Uniswap V4 smart contract stack — PoolManager, PositionManager, UniversalRouter, Permit2, and more — is now live and operational on ZugChain.

What Is Uniswap V4 and Why Does It Matter?

Uniswap V4 is the latest and most significant evolution of the world’s largest decentralized exchange protocol. It introduces a fundamentally new architecture compared to V2 and V3:

Singleton Architecture: In V2 and V3, every liquidity pool was its own smart contract. V4 consolidates all pools into a single PoolManager contract. This dramatically reduces deployment costs, eliminates redundant ERC20 transfers between hops, and makes multi-hop swaps far more efficient.

Hooks: V4 introduces a programmable hook system that allows developers to attach custom logic to pools — before or after swaps, before or after liquidity changes. This unlocks an entirely new design space: dynamic fees, on-chain limit orders, TWAP oracles, custom MEV protections, and much more.

Flash Accounting: Instead of transferring tokens at every step of a transaction, V4 uses a flash accounting model where balances are settled only at the end. This enables complex multi-step operations in a single transaction at a fraction of the gas cost.

Native ETH Support: V4 supports native ETH as a pool currency directly — no more wrapping required for most operations.

These are not incremental improvements. They represent a complete rethinking of how on-chain liquidity works.

A Closer Look at the Stack

WZUG — Wrapped ZUG

Every EVM-based DEX needs a wrapped version of the native asset to participate in token pairs. We built WZUG — a minimal, gas-efficient native wrapper for ZUG — based on the battle-tested Solmate ERC20 implementation.

function deposit() public payable {
    _mint(msg.sender, msg.value);
    emit Deposit(msg.sender, msg.value);
}

Simple, auditable, and secure. No bloat, no surprises.

Permit2 — Gasless Approvals

Permit2 is Uniswap's token approval framework that replaces the legacy approve() pattern. Instead of sending a separate approval transaction before every swap, users sign a typed message off-chain. This:

• Saves gas on every interaction
• Provides fine-grained permission control (amount limits + expiry)
• Works with all ERC20 tokens on ZugChain

PoolManager — The Heart of V4

The PoolManager is where all liquidity lives. Unlike V2/V3, there is only one PoolManager on ZugChain. All pools — ZUG/USDT, ZUG/USDC, USDT/USDC, and any future pairs — are managed by this single contract.

This means:

• Multi-hop swaps touch only one contract, not multiple pool contracts
• Dramatically lower gas costs for complex routes
• A unified accounting system across all pools

PositionManager — LP NFTs

Liquidity positions in V4 are represented as NFTs. The PositionManager handles minting, burning, and modifying positions. Each NFT represents a unique liquidity range in a specific pool.

Integrated with Permit2, liquidity providers can manage positions with gasless signatures.

ZugV4SwapRouter — Custom Swap Execution

We built a custom ZugV4SwapRouter on top of Uniswap's V4Router base contract. It provides:

• Direct, exact-in swap execution
• Native ZUG support (ETH-like)
• Automatic refund of unused ETH after swaps
• Reentrancy protection

function executeActions(bytes calldata params) external payable isNotLocked {
    _executeActions(params);
    uint256 balance = address(this).balance;
    if (balance > 0) {
        msg.sender.safeTransferETH(balance);
    }
}

UniversalRouter — One Router to Rule Them All

The UniversalRouter is Uniswap's flagship routing contract. It supports complex, multi-step transactions encoded as command sequences — swaps, liquidity operations, and more — all in a single transaction.

For ZugChain, we configured it with WZUG as the native wrapper and Permit2 for approvals. NFT marketplace integrations (OpenSea, Seaport, etc.) are stubbed to UnsupportedProtocol — keeping the deployment lean for a DeFi-focused chain.

Testnet Stablecoins: USDT & USDC

To enable real trading pairs out of the box, we deployed mintable ERC20 stablecoins:

• USDT at 0x09D192Ae1BE3BC8A2c8AccA9Fcd9635a1afD92B8
• USDC at 0x72d8b9916f6DBcd8F9a782e36aC9cf9c4f7b023e

These are testnet tokens with a public mint() function, allowing developers and testers to acquire liquidity freely during the testnet phase.

How We Built It — The Deployment Philosophy

This deployment was engineered for reliability and reproducibility. A few key design decisions:

Idempotent deploys: Our deployment scripts check if a contract is already deployed (by inspecting on-chain bytecode) before attempting to deploy it. Running the script twice on a live chain is safe — it will reuse existing contracts rather than deploy duplicates.

Foundry-native: The entire stack is built and deployed using Foundry — the industry-standard Solidity development framework. This ensures reproducibility, auditability, and compatibility with the broader Ethereum tooling ecosystem.

Modular scripts: Each contract has its own deploy script (DeployWZUG.s.sol, DeployPermit2Direct.s.sol, etc.), making it easy to redeploy individual components without touching the rest of the stack.

Deployment manifest: All deployed addresses are persisted to a single zugchain-v4.json file — a machine-readable source of truth that downstream integrations (frontends, APIs, wallets) can consume.

What This Enables

With Uniswap V4 live on ZugChain, the door is now open for:

Native token swaps — ZUG ↔ USDT, ZUG ↔ USDC, and any future pairs Concentrated liquidity — LPs can provide liquidity in custom price ranges, maximizing capital efficiency Composable DeFi — Any protocol built on ZugChain can integrate with the UniversalRouter as a primitive Hook-based innovations — Developers can build custom AMM logic on top of PoolManager hooks Bridge compatibility — The WZUG/native ZUG wrapping mechanism is compatible with future cross-chain bridging

For Developers

Want to integrate with ZugChain’s DeFi infrastructure?

RPC Endpoint:

https://rpc.zugchain.org
Chain ID: 824642

Explorer:

https://explorer.zugchain.org

All contract addresses are available in our deployment manifest. The Uniswap V4 SDK, ethers.js, and viem all work out of the box — just point them at our RPC and use the addresses above.

What’s Next

The Uniswap V4 deployment is a foundational milestone, but it’s just the beginning. On the roadmap:

• Liquidity Mining — Incentive programs for early LPs
• Hook Marketplace — A curated collection of community-built V4 hooks
• Mainnet Launch — Bringing the full stack to production

Join the ZugChain Community

ZugChain is building the infrastructure for the next generation of decentralized finance. $9.5M+ raised. Uniswap V4 live. The network is being built — come be part of it.

Website: zugchain.org X: x.com/zugchain Docs: docs.zugchain.org Block Explorer : explorer.zugchain.org

ZugChain — A high-performance Layer-1 blockchain unifying Bitcoin-grade security with Ethereum-level programmability.