In the previous article of our Interop series, we introduced the Open Intents Framework (OIF). Think of it as a universal language that lets users express intents like “I want to buy an NFT across chains,” and have network-wide solvers understand them. (Read more: Intents Standardized: How OIF Ends Cross-Chain Fragmentation.)
But understanding an intent isn’t enough — something still has to make it happen.
After you broadcast your intent, how does your funds move safely from Base to Arbitrum? How does the destination chain verify your signature? And who pays gas on the target chain?
This brings us to the core of the “Initialization” phase in Ethereum’s interoperability roadmap: the Ethereum Interoperability Layer (EIL). At the recent Devconnect, the Ethereum Foundation’s account abstraction team officially pushed EIL into the spotlight.
Put simply, EIL has an ambitious goal: without a hard fork and without changing Ethereum’s base-layer consensus, make using any L2 feel just like using a single chain.
1. What exactly is EIL?
To understand EIL, don't let the word “Layer” mislead you. EIL is not a new blockchain, and it’s not a traditional cross-chain bridge.
At its core, EIL is a suite of standards and frameworks. By combining account abstraction (ERC-4337) with cross-chain messaging, it aims to create a virtual, unified execution environment.
In today’s Ethereum ecosystem, each L2 is effectively an island. For example, your EOA on Optimism and your EOA on Arbitrum may share the same address, but their states are completely isolated:
- A signature on Chain A can’t be directly verified on Chain B.
- Assets on Chain A are invisible to Chain B.
EIL attempts to break this isolation through two key components:
1) ERC-4337-based smart accounts — account abstraction decouples account logic from keys. With EIL-style extensions:
- Paymasters sponsor gas on the destination chain, solving the “no gas where I’m going” problem.
- Key Managers help keep account state in sync across multiple chains.
2) A trust-minimized messaging layer — a standard way to package and transmit UserOps across chains via official rollup bridges or light-client proofs, so messages can move safely without relying on new centralized relayers.
Here’s a simple analogy:
Cross-chain today is like traveling abroad: you exchange currency (move assets), apply for a visa (re-authorize), and follow local traffic rules (buy destination-chain gas).
Cross-chain in an EIL world is more like paying with a Visa card: you sign once, and the underlying banking network — the EIL infrastructure — automatically handles FX, settlement, and verification. You don’t feel the border at all.
That’s the future the Ethereum Foundation’s account abstraction team is describing: with a single signature, you can complete a cross-chain transaction directly from your wallet, seamlessly settling across L2s, without relying on centralized relayers or adding new trust assumptions.
In many ways, this is closer to the “final form” of account abstraction. Compared with today’s high-friction, fragmented workflows, this model helps automate account creation, private key management, and complex cross-chain execution behind the scenes.
And with native account abstraction (AA) maturing, every account could become a smart account. Users would no longer need to worry about gas — perhaps not even know it exists — and could focus purely on on-chain experiences and asset management.
2. From “Cross-Chain” to “Chain Abstraction”
If EIL lands as envisioned, it could unlock the “last mile” of mass Web3 adoption. It marks a shift from multi-chain competition to chain-abstracted convergence, tackling the pain points that trouble both users and developers most.
For users: a true “single-chain experience”
For users, EIL enables a true “single-chain experience.” Under the EIL framework, you no longer need to switch networks manually.
For example, your funds are on Base, but you want to play a game on Arbitrum: you just click “Start,” sign once when your wallet pops up, and you’re in.
Behind the scenes, EIL packages your UserOp on Base, sends it through the messaging layer to Arbitrum, and a Paymaster covers gas and entry fees — so it feels as smooth as playing directly on Base.
For security: beyond multisig bridge single points of failure
From a security perspective, EIL moves beyond the single-point-of-failure risk of multisig bridges. Traditional bridges rely on external validator sets (multisigs): if they’re compromised, billions in assets are at risk.
EIL instead emphasizes trust minimization, leaning on L2-native security — for example, storage-proof-based verification — to validate cross-chain messages rather than third-party trust. In short, as long as Ethereum L1 remains secure, cross-chain interactions are comparatively safe.
For developers: one account standard across chains
For developers, EIL offers a unified account standard. Today, a DApp that wants to go multi-chain often has to maintain several code paths.
With EIL, you can assume users effectively have a cross-network account: as long as you build against the ERC-4337 standard, your app can naturally serve users across L2s without worrying which chain actually holds their funds.
But there’s still a major engineering problem: how do we let hundreds of millions of existing EOA users enjoy this experience? (See also: From EOA to AA: Will Web3’s Next Leap Happen at the Account Layer?)
Migrating from an EOA to an AA account usually means moving assets to a new address — far too much friction for most users. This is where Vitalik Buterin’s EIP-7702 comes in. It neatly resolves the long-standing compatibility debates among EIP-4337, EIP-3074, and EIP-5003 by doing something clever: it lets an existing EOA temporarily “transform” into a smart contract account during a transaction.
This means you don’t need to register a new wallet or move assets from your current imToken address into a new AA account. Instead, with EIP-7702 your existing account can temporarily gain smart-account capabilities — like batch approvals, gas sponsorship, and cross-chain atomic operations — and then revert to a fully compatible EOA once the transaction is done.
3. EIL’s Path to Reality — and What Comes Next
Compared with OIF’s more community-driven, bottom-up approach, EIL carries a much stronger “official” imprint. It’s a pragmatic infrastructure effort led by the Ethereum Foundation’s account abstraction team — the same group behind ERC-4337.
Current progress mainly shows up along three key tracks:
- Multi-chain expansion of ERC-4337 — extending the UserOp structure with cross-chain parameters such as destination chain IDs, the first step toward giving smart accounts real “cross-chain visibility.”
- Coordination with ERC-7702 — as EIP-7702 rolls out, everyday EOA users can plug into the EIL network seamlessly, sharply lowering adoption barriers.
- Standardized messaging interfaces — similar to how OIF standardizes intents, EIL is standardizing message transport at the infrastructure layer. Optimism’s Superchain, Polygon’s AggLayer, and ZKsync’s Elastic Chain are all exploring interoperability within their own ecosystems; EIL’s goal is to connect these heterogeneous worlds into a shared, network-wide messaging layer.
Even more interesting, EIL’s vision goes beyond just “connecting” chains — it’s also filling in another key base-layer capability: privacy.
If EIP-7702 and AA solve accessibility, then the Kohaku privacy framework that Vitalik unveiled at Devconnect may be the next puzzle piece, echoing another core idea from the Trustless Manifesto: censorship resistance.
At Devconnect, Vitalik was blunt: “privacy is freedom.” He noted that Ethereum is already on a privacy-upgrade path aimed at delivering real-world levels of privacy and security. To that end, the Ethereum Foundation has set up a dedicated privacy team of 47 researchers, engineers, and cryptographers, working to make privacy a true “first-class” property of Ethereum.
This means privacy will no longer be an optional add-on, but a basic capability as natural as sending a transfer. As a concrete step toward that vision, the Kohaku framework uses your public key to create temporary stealth addresses, allowing you to perform private actions without revealing links back to your main wallet.
Under this design, future AA accounts will be more than asset management tools — they’ll also act as privacy shields. By integrating protocols like Railgun and Privacy Pools, AA accounts can help users protect transaction privacy while still providing compliant “proofs of innocence”: you can show that your funds are not illicit without exposing your full spending path.
The Roadmap in One View
Taken together, Ethereum’s interoperability roadmap becomes clear:
- OIF (Intent Framework): helps the application layer understand what users want.
- EIL (Interoperability Layer): lays the infrastructure to execute those intents seamlessly.
This is likely the signal the Ethereum Foundation wants to send: Ethereum shouldn’t be a loose collection of L2s, but a single, unified supercomputer.
When EIL truly lands, we may no longer need to explain what an L2 or a cross-chain bridge is to new users — they’ll simply see their assets, not the borders between chains.