What is LayerZero? - Metis Launch Article.

In conclusion

Introduction to Layer Zero.

One of the major challenges that the web3 and crypto industry will and continues to face is the lack of seamless interoperability between the various blockchains.

Through the advent of perhaps Bitcoin maximalism, die-hard communities have formed on Reddit, crypto Twitter and elsewhere. Siloed echo chambers are established to propagate certain ideologies and beliefs. Now, this isn’t data-backed, but my guess is that such behaviour has had at least some effect on the development side as well. Perhaps, certain devs have fallen prey to this illusion - of a superior product that they’ve built and that the idea of interoperability is likely foreign to them. Blame the maxis haha. They’re more concerned about their bags I tell ya. However, only a minor subset of people would agree with the idea of building in isolation. Our industry relies on partnerships and collaborations to progress further and grow. It is in the best interest and a net benefit for all parties involved. 

Core believers and contributors in the space see crypto as analogous to a public good of sorts, and if this is the case, tooling and infrastructure need to be built in order to support frictionless omnichain interoperability between blockchains that is secure.

The bigger problem has been that a bunch of smart people have built these massive ecosystems and public networks, but these do not communicate well with each other. The intent wasn’t doubtful (for the most part), but the foresight was perhaps missing. Regardless, the problem has been well documented in the last few years, and solutions are appearing. LayerZero is one such solution.

In this article, I intend to explain what LayerZero is, why it is needed, explore the ecosystem, the deployment on Metis, and much more.

What is LayerZero?

I believe it is easier for me to explain what LayerZero isn’t, and then based on that, we’ll understand what it actually is.

  1. LayerZero isn’t a blockchain
  2. LayerZero isn’t a crypto bridge
  3. LayerZero isn’t an application

LayerZero is an omnichain interoperability protocol that connects blockchains. The protocol allows various applications to leverage its tech to build and deploy truly interoperable decentralised applications.

As per the docs, “LayerZero is an omnichain interoperability protocol designed for lightweight message passing across chains.” 

A more technical explanation would be that LayerZero is a configurable on-chain endpoint for User Applications (UAs) that runs a ULN (Ultra Light Node) - more on this later. It relies on the cooperation of two parties, the Oracle and the Relayer, to transfer messages between on-chain endpoints. When a UA sends a message from one blockchain (chain A) to another (chain B), the message is routed through the endpoint on chain A. The endpoint then alerts the designated Oracle and Relayer about the message and its intended destination on chain B. The Oracle sends the block header to the endpoint on chain B, and the Relayer submits a transaction proof. This proof is checked on the destination chain, and the message is delivered to the intended address.

Without getting too technical, the aim of LayerZero is to provide seamless interconnectivity between different blockchain networks, allowing users to execute transactions without even realising it. It enables decentralised applications (DApps) to operate across different blockchain platforms, including EVM and non-EVM systems, creating the first omnichain applications in the world.

Let me briefly touch on the current landscape of cross-chain bridging and transmission of messages and how LayerZero is disrupting the space. Broadly speaking, there are two approaches:

  1. Middle Chain: In this model, middle chains are responsible for receiving, verifying, and forwarding messages between different blockchain networks. However, this also makes them a single point of failure, as they are granted full signing power over all messages. If the middle chain experiences consensus corruption, it could potentially steal all liquidity on all connected chains. Currently, middle chains typically only bond a few hundred million dollars to secure tens of billions, making them vulnerable to exploitation as they become more decentralised. It is not a question of if, but when…..this large honeypot will be targeted.
  1. On-Chain Light Node: On-chain light nodes offer the most secure way to transmit messages between blockchain networks by receiving and verifying each block header for every pairwise chain on the opposite chain. Transaction proofs containing messages are then forwarded and validated on the chain using the block headers. However, this method is also the most costly, with the cost of running an on-chain light node on Ethereum estimated at tens of millions of dollars per day per pairwise chain.

Thus, we need to find a sweet spot in the middle. The safety and security of an on-chain light node and the requirement for economical ways of functioning like running a middle chain.

An Ultra Light Node (ULN) aims to solve this problem. As you’ll recall, LayerZero runs on a ULN. The Ultra Light Node (ULN) offers the security of a light node at a more cost-effective price point, similar to middle chains. This is achieved by performing the same validation processes as an on-chain light node, but instead of storing all block headers in sequence, block headers are streamed on demand by decentralised oracles. This allows the ULN to maintain the same level of security while reducing storage and computational requirements.

I know I threw some technical jargon your way, and trust me, even I had a hard time wrapping my head around it all. I come from a non-tech background myself. However, I hope the gist of it is clear.

If you want to dive deep into the tech and the implementations, you can read the whitepaper here. From a normie’s perspective, like myself, the above explanation should suffice. 

Jedi blocmates wrote a thread on this topic that explains this even further.


Use Cases & Blockchain Support of Layer Zero

I am sure you are wondering just about now what are some of the use cases of this tech.

The obvious answer is that you can do simple cross-chain “bridging” of crypto assets. While that is a major use case, there is a lot more than meets the eye here. LayerZero enables cross-chain state sharing, bridging, lending and borrowing, swaps, governance, etc.

  1. State Sharing: As an example, SushiSwap operates on twelve different blockchain networks, with each instance running independently. In order to synchronise the state with the main Ethereum instance, SushiSwap would need to write separate code for using various cross-chain technologies, such as Wormhole, Rainbow Bridge, Polygon Network Bridge, and Avalanche Bridge. This results in eleven different code sets, interfaces, and security properties, which can be difficult to manage as the ecosystem of bridges and L1/L2 networks is constantly changing. With LayerZero, SushiSwap can use a single interface and code base for all cross-chain pairs, only needing to implement send and receive functions. The send function involves creating a message for the destination chain whilst the receive function interprets that message.
  2. Unified Liquidity Bridge: Currently, bridges compete for liquidity providers (LPs) and fragment/divide liquidity among their individual pairwise pools. This means that instead of having a single pool that provides liquidity for an asset across all connected chains, LPs must choose a single pool that connects to one specific chain. With LayerZero, it is possible to achieve unified liquidity across all chains with guaranteed finality on the source chain. This means that when a user transfers an asset from one blockchain (Chain A) to another (Chain B), the user is guaranteed to receive the asset on Chain B, and the LP providers receive fees from all incoming transactions to Chain B, regardless of the source chain. This can be seen as the holy grail of bridging.
  3. Swaps: It is possible to use existing automated market makers (AMMs) to perform cross-chain swaps of one asset for another without modifying any existing code. This allows users to swap from ETH on Ethereum to SOL on Solana in a single transaction from the source chain. This could “potentially” eliminate or minimise the use of wrapper assets.
  4. Lending & Borrowing: Currently, if a user wants to use assets on one blockchain (chain A) to farm rewards/borrow on another blockchain (chain B), they would need to go through several steps, including collateralising on chain A, borrowing, bridging (incurring a fee), swapping (incurring a fee), farming on chain B, swapping back (incurring a fee), bridging back (incurring a fee), repaying the loan, and un-collateralising. With LayerZero, the process is streamlined, allowing the user to collateralize on chain A, borrow on chain B, farm, repay, and unlock the collateral, skipping the four bridging and swapping fees. This can save the user time and money.

I hope these use cases explain the utility and importance of LayerZero - an omnichain interoperability protocol.

As of writing, LayerZero supports the following blockchains:

  • Ethereum
  • BNB
  • Avalanche
  • Aptos
  • Polygon
  • Arbitrum
  • Optimism
  • Fantom
  • Swimmer
  • DFK
  • Harmony
  • Moonbeam
  • Celo
  • Dexalot
  • Fuse
  • Gnosis
  • Klaytn
  • Metis
  • Intain

Again, by supporting these blockchains, it means that builders can leverage LayerZero to deploy dapps across these networks that can seamlessly communicate in a frictionless manner amongst the networks.

Layer Zero Ecosystem Projects

Credit: https://twitter.com/L0_Corner/status/1598738882237009920?s=20&t=-E37_g2RLzvxWCXMcsyplw

It would be beneficial to get an overview of the ecosystem of dapps that are leveraging LayerZero. Some of the major ones are:

  • SushiSwap
  • TapiocaDAO
  • Stargate
  • Blur
  • Interswap
  • Hashflow

These applications are building for an omnichain, interoperable and decentralised future, with LayerZero as the infrastructure layer or the tooling essential to ensure this future.

Metis on Layer Zero


On 9th December 2022, LayerZero went live on the Metis Andromeda Mainnet. For those unaware, Metis is an EVM-compatible Layer 2 scaling solution built on top of Ethereum that allows for cheaper (cheapest relative to other L2s at 0.02 cents per tx) and faster transactions. If you want to learn more about Metis, you can read our guide here.

Regardless, this partnership will massively help the multi-chain protocols that are deployed on Metis Andromeda and will further the interoperability development on Metis. The following projects will benefit

  1. SushiSwap
  2. QiDAO
  3. Granary Finance
  4. Unidex Finance

As you can imagine, these are muti-chain protocols that are also deployed on Metis along with other networks. Now with the partnership with Layer Zero, these protocols can communicate seamlessly with the other chains they’re deployed on.

Also, the Metis bridge leverages LayerZero.

In essence, this partnership is intended to help various apps deployed on Metis to utilise LayerZero for omnichain communication to and from Metis. Therefore, one can see Metis at the protocol layer, the underlying tech that allows the deployment of various decentralised applications. SushiSwap, for instance, at the application layer, which is one DApp deployed on Metis and on other chains - as we head towards a multi-chain future. Finally, LayerZero is at the communication layer, which helps, in this case, SushiSwap to seamlessly interact and communicate to and from Metis to other networks it is deployed on. This is a layman's explanation, I’m sure there are nuances to this simplified explanation.


I ultimately we are headed towards a multi-chain future. At blocmates we have been strong advocates of the fact that there won’t be a winner takes all kind of thing, but instead, a host of blockchains and networks will coexist. Purpose-driven blockchain may become a thing, we can never tell the future. Nonetheless, as applications are deployed on multiple blockchains, it becomes paramount that omnichain communication and bridging is secure. LayerZero is building towards it.

The Metis and LayerZero partnership was a no-brainer for both parties. Given that most applications deployed on Metis are multi-chain, this partnership will aid them with their future development. As for LayerZero, it gives them another ecosystem and continues on their journey towards a true omnichain interoperable world.

My novice brain tells me that the adoption of this tech could challenge the world of wrapped assets and cross-chain bridging. That remains to be seen, and this isn’t a binary thing.

That’s it for today folks, I hope you found this article useful and informative.


LayerZero Website: https://layerzero.network/

LayerZero Twitter: https://twitter.com/LayerZero_Labs

LayerZero Docs: https://layerzero.gitbook.io/docs/

LayerZero Medium: https://medium.com/layerzero-official

Metis Website: https://www.metis.io/

Metis Twitter: https://twitter.com/MetisDAO

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