The world of cryptocurrencies does not stand still – it is changing at an amazing rate. If at first everything was reduced to simple payment systems, today we see complex decentralized platforms running a wide variety of applications: from financial services and games to metaverses and Web 3 projects.

But any popularity has a downside. Blockchain technologies have become so in demand that they are faced with a serious problem — scalability. Giants such as Ethereum and Bitcoin (first-tier networks) can no longer cope with the influx of users. Their weaknesses are slow transaction processing and high fees.

Against this background, layer 2 (L2 crypto) solutions have become particularly valuable. Their task is to smooth out the rough edges, while maintaining the main thing: the reliability and security of the underlying protocols. In fact, this is a fresh look at how to "disperse" the blockchain ecosystem. Thanks to L2, users have access to fast, low-cost and convenient ways to work with digital assets and decentralized applications.

This article provides a detailed overview of the best layer 2 crypto, their advantages and features, as well as their impact on the future of the crypto industry.

What are second-layer cryptocurrencies?

If you follow the world of crypto coins, you've probably come across the term Layer 2. Let's figure out what it is and why it is needed.

Imagine a popular blockchain like Ethereum as a busy highway during rush hour: there are a lot of cars (transactions), traffic slows down, and the "toll" (fees) increases. This is where second—level solutions come to the rescue - they unload the main network without touching its code.

Layer 1 blockchains, such as Bitcoin or Ethereum, guarantee security, but have limitations on the speed and cost of transactions. Level 2 solves this problem cunningly:

• Transactions are processed outside the main chain, as if "in the background."
• Then they are combined into packets and sent to the main blockchain with a single record.
• The main network confirms the package, maintaining security, but spending much less resources.

It turns out to be a kind of "express mode": the main network remains reliable, and users receive fast and cheap transactions. In practice, this is implemented in different ways.

Optimistic Rollups

A lot of transactions are collected outside the blockchain, and then sent to the main network. The system "optimistically" assumes that everything is correct, but leaves the opportunity to check the data if in doubt.

Zk‑Rollups

They also combine transactions, but they use cryptographic evidence of zero disclosure. This allows you to confirm the correctness of operations without disclosing their details — safely and confidentially.

Sidechains

Separate blockchains running parallel to the main one. They have their own consensus mechanism and economy, but they are connected to the main network and can transfer assets back and forth.

Advantages of second-tier cryptocurrencies:

• Speed. Transactions take place in seconds, not minutes.
• Low fees. Instead of tens of dollars, pennies.
• Scalability. The network copes with the influx of users without overloading.
• Convenience. For the average person, operations become simpler and clearer.
• Support for DeFi, NFT and games. Decentralized finance, digital assets, and blockchain games are getting the performance they need.

L2 coins are not a replacement for the main blockchains, but their "accelerator". They take the load off the main networks, making cryptocurrencies more practical for everyday use. Without them, mass adoption of digital assets would be much more difficult: too expensive, slow and inconvenient. Right now, it is level 2 that helps the crypto ecosystem grow and go beyond narrow niches.

Top 10 Layer 2 projects for 2025

Below is a layer 2 blockchain list of the most popular L2 coins.

Arbitrum

Arbitrum is one of the leading ETH Layer 2 coins, based on Optimistic Rollup technology. The project offers developers a convenient toolkit for quickly creating decentralised applications (dApps) with minimal costs and maximum performance.

Key features:

• Optimistic rollup for efficient Ethereum scaling.
• Two main networks: Arbitrum One and Arbitrum Nova.
• Arbitrum Nitro stack for increased scalability.
• ARB token is used for governance and participation in the ecosystem.

Polygon

Formerly known as Matic Network, Polygon has become a universal solution for scaling Ethereum, offering a range of tools and protocols for developers and users.

Key advantages:

• Numerous scaling options: zk-rollups, optimistic rollups, Plasma, and PoS bridges.
• Low fees and high transaction speeds.
• Compatibility with Ethereum and an extensive ecosystem of applications.
• The POL token is used for staking and paying fees.

Dymension

The Dymension project stands out for its unique approach to creating modular RollApps based on Cosmos SDK and Tendermint.

Distinctive features:

• Development of specialised applications (RollApps) with a high level of customisation.
• Basic infrastructure and cross-chain communication via IBC.
• Ability to stake and participate in governance via the DYM token.
• Focus on scalability and application interoperability.

Base

Developed by Coinbase, the Base project aims to provide maximum convenience for developers and users by offering ultra-low fees and powerful tools for building applications.

Key points:

• Advanced features such as account abstraction and smart wallets.
• Connection to Coinbase infrastructure for convenient asset transfers.
• Plans to attract billions of new users to the blockchain economy.

Optimism

Optimism is developing the Superchain concept — a unified OP Chain network with a common infrastructure and standardised tools for developers.

Features:

• Superchain architecture with horizontal scaling capability.
• Permissionless withdrawal system and modular validator sequence.
• Standardised tools for cross-chain development.
• OP token with a market capitalisation of approximately $850 million.

Stacks

Stacks, featured in the bitcoin layer 2 projects list, is a unique second‑layer solution for Bitcoin that allows smart contracts and DeFi applications to be implemented directly on the basis of the first cryptocurrency.

Special features:

• Smart contracts and decentralised applications based on Bitcoin.
• Nakamoto upgrade to reduce transaction confirmation times.
• sBTC token for secure pegging to Bitcoin.
• The market capitalisation of the STX token is approximately $830 million.
• Stacks tops the list of Bitcoin layer 2 projects in terms of demand and capitalisation.

Eclipse

Eclipse is the first Ethereum layer 2 network running on the Solana virtual machine, providing a unique combination of technologies from two popular blockchains.

Unique features:

• Ethereum transactions using ETH.
• Scalable data availability via Celestia.
• Zero-knowledge fraud protection via RISC Zero.
• Full integration with Ethereum and Solana.

Metis

The Metis platform aims to address key limitations of Ethereum, such as high gas costs and insufficient transaction speeds.

Additional features:

• Low fees and fast transaction turnover.
• Convenient interface and ease of use.
• NFT bridge between the Andromeda and Ethereum networks.
• Framework for creating decentralised autonomous companies (DACs).
• METIS token for paying fees and participating in governance.

COTI V2

COTI V2 is a new generation of second-layer blockchain built on Ethereum and focused on privacy and scalability.

Key advantages:

• Privacy and security of transactions.
• Fast and cheap transactions at Ethereum layer 2.
• Special privacy method — obfuscated chains.
• Suitable for businesses and institutions that need to comply with regulatory requirements.

ImmutableX

ImmutableX specialises in non-fungible tokens (NFTs) and games, offering environmentally friendly and free transactions.

Key advantages:

• No fees for issuing and trading NFTs.
• High throughput (thousands of transactions per second).
• Carbon-neutral operations.
• Ideal for NFT marketplaces and blockchain games.

This list of layer 2 blockchains demonstrates a wide range of innovative approaches to solving the scalability problem of blockchain technology. Each of them occupies a special place in the modern crypto industry, offering unique solutions and opening up new opportunities for developers, investors, and end users.

Conclusion

We have come to the end of our immersion into the world of cryptocurrencies of the first and second levels. And now it is especially noticeable: in order to feel confident in this area, you need to understand the variety of blockchain solutions.

The layer 1 and layer 2 crypto list is a clear confirmation of how fast technology is developing. They literally "adapt" to the growing demands of the market and users.

Take, for example, first-level blockchains. Ethereum and Bitcoin still play the role of the foundation: their decentralization and openness create the very reliability and trust without which the system could not exist. But level 2 solutions — Arbitrum, Polygon, and Optimism — solve a different problem. They remove the main barriers of the first blockchains: high fees and slow transactions. In fact, it is an "add-on" that makes the system more efficient.

This interaction of levels is not a competition, but a complementarity. This is what brings the cryptoeconomy to a new stage.: it becomes easier and more accessible for a wide variety of users.

What's next? Most likely, we will see:

• expanding the list of L1 and L2 projects;
• the emergence of fresh technological solutions;
• closer integration between different levels of the blockchain ecosystem.

So understanding the differences between L1 and L2 is no longer just interesting, but necessary. This is the key to participating consciously in the digital asset world of the future.

Frequently asked questions

What is Layer 2?

Layer 2 refers to solutions aimed at increasing the scalability and performance of first-level (Layer 1) blockchain networks, such as Ethereum or Bitcoin, by processing transactions outside the main chain and then returning the result back to the main network.

Why are Layer 2 solutions necessary?

The need for Layer 2 is driven by Layer 1 scalability issues, such as high fees and slow transaction processing speeds, which hinder the mass adoption of blockchain technology.

What are the main types of Layer 2 solutions?

The main types of Layer 2 solutions are Optimistic Rollups, Zero-Knowledge Rollups (zk-Rollups) and Sidechains, each offering a unique balance between speed, security and functionality.

What benefits do users get from implementing Layer 2?

Users get significant benefits in the form of lower transaction fees, faster transaction processing speeds, and expanded functionality of blockchain applications.

How to choose the right Layer 2 solution?

The choice of the optimal Layer 2 solution depends on the specific needs of the project, the type of applications (e.g., DeFi, NFT, games), security preferences, cost, and ease of integration.