As Ethereum moves into a new phase of modularity and multi-chain coexistence, Layer2s are no longer just scaling tools — they are now essential infrastructure in the multi-chain world. One clear trend is accelerating: interoperability is becoming the central consensus for reshaping user experience and protocol collaboration in the Layer2 era. It’s not just about technical integrations — it’s about a fundamental shift in the user experience paradigm — from multi-chain coexistence to seamless unification.

On May 28, the 9th L2 Interop Working Group meeting brought important new developments. The session focused on advancing cross-chain protocol standards, core developer tools, and several new proposals related to user experience and liquidity. Centered around “engineering collaborative interoperability standards,” this milestone marked a transition from concept to implementation — painting a clearer picture of what Layer2 interoperability can become.

Ethereum’s Layer2 ecosystem has evolved into a multi-chain landscape. Yet, the complexity of cross-chain interactions still limits user experience and liquidity movement. Fragmented network environments require users to manually switch between chains, and gas costs and delays further hinder adoption.

Legacy approaches to chain interaction are now being replaced by a standardized interoperability layer — one that focuses on real user needs. Interoperability is no longer just about connecting chains, but about enabling seamless end-to-end experiences. This principle was reflected across several key discussions at the event:

Proposed by OpenZeppelin, ERC-7786 introduces a scalable and composable messaging standard for cross-chain communication. It works in tandem with ERC-7930 to define chain-specific binary address formats, solving formatting issues between chains.

The standard is now stable, and next steps include expanding to cover gas payment and message verification — aiming to abstract away chain-specific protocols and enable protocol-agnostic messaging.

Co-developed by the Ethereum Foundation and Wonderland, “Interop Wallet v0” is an experimental cross-chain wallet UX prototype. Built on Ambire, it currently runs on testnets and focuses on validating standards like ERC-7828/7930 in real UX scenarios.

Account abstraction is equally critical in a cross-chain future. EIP-7702 introduces temporary smart contract delegation for EOAs, allowing users to access smart wallet capabilities — such as batch transactions, fee sponsorship, and permission control — without changing their address or migrating funds. It lays a vital technical foundation for smoother cross-chain user experience.

OIF 2.0 is a collaborative initiative from Hyperlane, LI.FI, Across, OpenZeppelin, and others. It offers a modular framework for intent expression, resolution, and execution across chains — not as a bridging protocol, but as an Intent Layer.

OIF aims to enable any DApp on any chain to support seamless “user expresses intent, network executes it” experiences — unlocking the full potential of intent-based UX.

Proposed by Wonderland, these standards form key infrastructure for interoperable addressing.

• ERC-7828 introduces human-readable address formats like alice@arbitrum.l2.eth

• ERC-7930 defines binary resolution logic across chains

Together, they enable context-aware addresses that reduce the risk of user error and simplify cross-chain interaction. The system will adopt ENS-style subdomain governance under .l2.eth.

A new proposal from Socket, Filler Vaults decouple capital providers and executors. Inspired by HLP-style vaults, this model allows vault owners to delegate strategies to executors, enabling distributed matching of liquidity and operational capabilities. This design could address centralization in current solver ecosystems and bring scalability and flexibility to the intent economy.

As a core member of the OP Superchain, Mint actively supports the development and implementation of interoperability standards. We’re closely following and exploring how these frameworks can be integrated into Mint’s core ecosystem.

Our goal is to provide users with more efficient, secure, and unified cross-chain experiences, helping to shape the next generation of seamless Web3 & NFT infrastructure.

For new-generation decentralized infrastructures like Mint Blockchain, embracing interoperability is no longer optional — it is a fundamental responsibility in co-evolving with the ecosystem.

As these standards take root, the multi-chain landscape is evolving into what we call “loosely coupled, tightly integrated.” Chain differences will fade into the background for users, while developers retain the flexibility of modular design.

We’re entering an era where connectivity is being redefined. Chains will no longer be silos — the future of Web3 isn’t just multi-chain, but cross-chain collaborative.

And Mint is here for it — actively building the bridges of this new interoperable era.