The evolution of blockchain technology is often framed as a layered narrative, with each layer addressing specific challenges and unlocking new possibilities. Layer 1 protocols, such as Ethereum, provide the foundational architecture. Layer 2 solutions, like Optimism or Arbitrum, aim to scale transactions by reducing congestion on the base layer. Now, a new frontier is emerging: Layer 3, which serves existing L1 and L2 networks by efficiently routing data and assets cross-chain.

While this basic description of layers 1-3 holds true, there are of course times when the distinction blurs. L2s sometimes do the work of L3s and vice-versa, while some protocols that effectively serve as L3s don’t use that nomenclature. Despite this blurring of boundaries, as a basic rule of thumb, L3s are designed to serve the existing onchain landscape rather than drawing liquidity and users further away from the center.

To visualize how L3 is complementing existing DeFi services, particularly when it comes to trading, it’s necessary to consider the evolution of blockchain up until now. Just as you can’t start building an apartment on the second floor, L3s would not have been possible without the existing foundations in place.

The Case for Layer 3

In blockchain architecture, Layer 3 goes beyond simply scaling to enable specialized functionalities for specific use cases, such as advanced trading mechanisms, data privacy, or gaming. Unlike Layer 2, which focuses on throughput and cost reduction, Layer 3 solutions are designed to enhance what can be done onchain and to bring fragmented chains closer together.

Depending on their architecture, L3s can, for example, support complex operations like limit orders and algorithmic trading directly onchain. They may also improve interoperability, bridging liquidity and functionality across multiple chains without requiring asset migration. And, when integrated into existing protocols such as DEXs, they can improve user experience by providing better pricing through routing liquidity from across the omnichain landscape. Let’s consider three L3s in turn to visualize how this plays out in action.

Orbs: Bringing Advanced Trading Tools to DeFi

Orbs’ Layer 3 exemplifies the potential of L3s to enable sophisticated trading strategies in decentralized finance. Built atop existing Layer 1 and Layer 2 infrastructure, Orbs introduces tools like dTWAP (Decentralized Time-Weighted Average Price) and dLIMIT (Decentralized Limit Orders), which are traditionally associated with centralized exchanges.

Designed for traders seeking to execute large orders without causing market disruption, dTWAP allows transactions to be broken into smaller chunks and executed over time. By automating this process onchain, Orbs empowers users with a tool more commonly synonymous with centralized exchange order books.

dLIMIT, meanwhile, enables onchain limit orders, letting users set predefined price points for buying or selling assets. Unlike traditional AMMs (Automated Market Makers), which execute trades based on liquidity curves, dLIMIT provides more precise execution, catering to professional traders.

These twin technologies enhance the trading experience on decentralized platforms, making DeFi a viable alternative to centralized exchanges for executing more complex strategies. Crucially, Orbs achieves this without requiring users to migrate assets to a new chain, leveraging its Layer 3 architecture to integrate seamlessly with existing ecosystems. From SushiSwap to PancakeSwap, Orbs’ L3 technology has been widely integrated across a slew of EVM chains.

StarkNet: Blurring the Lines Between Layer 2 and 3

While StarkNet is often categorized as a Layer 2 solution, its approach increasingly overlaps with Layer 3 functionality. By using STARK-based rollups, StarkNet facilitates off-chain computations that are then verified onchain, providing both scalability and security.

For DeFi applications, this means that high-throughput trading dapps can execute complex algorithms without burdening the base layer. StarkNet’s focus on zk-rollups ensures that transactions are not only efficient but also private – a critical consideration for institutional traders especially. Cairo, StarkNet’s proprietary programming language, enables developers to build advanced trading applications tailored to their specific needs. This blend of flexibility, scalability, and security positions StarkNet as a versatile L3 in all but name.

StarkNet boasts the fastest-growing Ethereum Layer 2 developer community, and is particularly attractive for devs looking to create complex dapps that can support use cases such as high-frequency trading. Starknet also enhances user experience by employing Native Account Abstraction. All accounts operate as smart accounts whose behavior is determined by developers rather than at the protocol level. This means devs can customize their applications to elevate user experience without compromising security.

zkSync: Scaling with Privacy and Compatibility

zkSync, another prominent player in the Layer 2 landscape, is also operating higher up the stack to enhance Layer 3 capabilities. By employing zk-SNARKs, zkSync achieves both scalability and privacy. This dual focus makes it a compelling option for trading protocols that require high throughput and confidentiality.

What sets zkSync apart is its emphasis on Ethereum compatibility. By supporting existing Ethereum tools and wallets, zkSync lowers the barriers to entry for developers and users, facilitating seamless integration into DeFi ecosystems. For trading platforms, this means they can leverage zkSync’s scalability without rebuilding their infrastructure from scratch.

With its focus on privacy, zkSync is particularly well-suited for trading strategies that involve sensitive data or large transactions, ensuring that users’ activities remain confidential while benefiting from the efficiencies of Layer 3. Aside from its own L2 EVM, zkSync has brought its technology to bear across other ecosystems including Polygon. Its knowledge of working with zk-SNARKs has made it the go-to developer team for protocols looking to harness the versatile technology.

The Future of Layer 3

The approaches taken by Orbs, StarkNet, and zkSync highlight the diversity of solutions emerging in the Layer 3 space. While their strategies differ – Orbs prioritizes advanced trading tools, StarkNet emphasizes scalability and security, and zkSync focuses on privacy and compatibility – they share a common goal: enhancing the capabilities of decentralized finance. Making all networks, regardless of layer or language, work as one.

As Layer 3 technology matures, it’s poised to become deeply embedded into the DeFi landscape. And from a user perspective, much of the time it will be invisible through seamless integration with existing protocols and chains. But users will feel the benefits even if they can’t see them in the better pricing they enjoy every time they make a swap; in the assets they rapidly route between chains; and in the advanced order types they can set on DEXs and perps platforms.

For developers, Layer 3 represents an opportunity to build applications that were previously impractical due to technical limitations. For users, it promises a more seamless and efficient trading experience. And for the entire omnichain landscape, it signifies a step closer to realizing the vision of a decentralized, interconnected financial system.

The next wave of DeFi innovation will likely be driven by these advancements in Layer 3 technology. Whether through Orbs’ trading tools, StarkNet’s rollups, or zkSync’s privacy solutions, the possibilities are vast – and the tech is improving all the time. What’s clear is that the future of onchain trading will be shaped by those who can deliver both scalability and sophistication, creating a DeFi ecosystem that works for everyone.