How to Use LayerZero, zkSync, Starknet, and Other Infra in 2025

Introduction

In 2025, the blockchain ecosystem is increasingly driven by infrastructure protocols that solve key challenges such as scalability, interoperability, and user experience. Tools like LayerZero, zkSync, and Starknet are no longer just experimental—they are integral to the functionality of modern decentralized applications (dApps).

Whether you’re a developer, investor, or curious user, understanding how these protocols work—and how to use them—is essential for navigating the evolving Web3 landscape. This article provides a clear, accurate overview of how to engage with these infrastructures today.

1. LayerZero: Cross-Chain Messaging Made Simple

LayerZero is an interoperability protocol that allows smart contracts on different blockchains to communicate securely and efficiently.

Key Features:

• Omnichain messaging: Supports communication across chains like Ethereum, BNB Chain, Avalanche, Arbitrum, and more.
• Modular security: Uses a combination of oracles and relayers to verify messages without locking assets.

How to Use LayerZero in 2025:

• As a user: You can use dApps like Stargate (built on LayerZero) to bridge tokens across chains.
• As a developer: Integrate the LayerZero SDK to send and receive messages between smart contracts on different blockchains.

2. zkSync: Scalable Layer 2 on Ethereum

zkSync is a Layer 2 scaling solution for Ethereum using zero-knowledge rollups (zk-rollups). It aims to reduce transaction fees and improve speed while maintaining Ethereum’s security.

Key Features:

• zkSync Era: Supports the Ethereum Virtual Machine (EVM), allowing developers to deploy Ethereum-compatible smart contracts.
• Account abstraction: Enhances user experience with features like social recovery and paymaster systems.

How to Use zkSync:

• Users: Access apps on zkSync Era such as DeFi protocols, NFT marketplaces, and wallets.
• Developers: Use existing Solidity codebases and deploy them using zkSync’s development tools.

3. Starknet: A STARK-Based ZK-Rollup

Starknet is another Layer 2 solution on Ethereum, developed by StarkWare. It leverages STARK proofs (a form of zero-knowledge cryptography) to offer secure, scalable execution.

Key Features:

• Cairo language: Starknet uses Cairo, a custom language designed for efficient proof generation.
• Permissionless: Anyone can deploy and interact with smart contracts on Starknet.
• Growing ecosystem: Includes apps like JediSwap, zkLend, and Nostra.

How to Use Starknet:

• Users: Use Starknet wallets such as Argent X or Braavos to interact with live dApps.
• Developers: Write contracts in Cairo, deploy using tools like Protostar or Starknet CLI.

4. Other Notable Infrastructure Protocols

Besides the major players above, several other protocols play critical roles in Web3 infrastructure:

✅ Celestia

A modular data availability layer designed to work with rollups. Instead of processing transactions, Celestia ensures that data is published and available for validation.

✅ EigenLayer

A restaking protocol built on Ethereum, allowing users to re-use staked ETH to secure new protocols and services—creating a new model for decentralized security.

✅ Axelar and Wormhole

Both offer cross-chain messaging solutions. Axelar uses a validator set to pass messages across chains, while Wormhole uses a network of guardians.

✅ Avail

Backed by Polygon, Avail is another data availability solution focused on helping modular blockchains scale with shared security.

5. Practical Advice for Users and Developers

For Users:

• Choose wallets that support these protocols (e.g., Argent X for Starknet, MetaMask + zkSync Snap, or Leap Wallet for LayerZero dApps).
• Stay aware of transaction fees and testnet availability for each chain.
• Verify URLs and dApps to avoid phishing scams in the expanding cross-chain ecosystem.

For Developers:

• Focus on modular architecture: separate execution, settlement, and data availability where possible.
• Use testnets and grants programs: zkSync and Starknet regularly fund new projects.
• Stay updated with each protocol’s roadmap—features like shared sequencers or native bridging can impact your deployment strategy.

Conclusion

The Web3 infrastructure stack in 2025 is more mature, modular, and interconnected than ever. LayerZero, zkSync, and Starknet each offer unique advantages that solve specific blockchain challenges—whether it’s scalability, security, or interoperability.

For developers, these tools open doors to powerful cross-chain and zero-knowledge applications. For users, they offer faster, cheaper, and more seamless blockchain experiences. As this infrastructure continues to evolve, staying informed and involved is the best way to future-proof your dApp or investment strategy.