Supporting both EVM and CosmWasm has helped attract a wide range of users and developers. But this dual-architecture approach has also created serious headaches.
A new proposal suggests streamlining Sei into a fully EVM-based chain. The goal is to reduce developer pain, infrastructure complexity, and user confusion.
Why Dual Support Became a Double-Edged Sword
In theory, letting users interact with both Cosmos-native and EVM-based apps was a win for flexibility. Sei’s architecture allowed interoperability between Ethereum’s EVM and Cosmos’s WasmVM, a WebAssembly-based system that powers smart contracts. But in practice, the setup created several sticking points.
Users have to manage two separate wallets—EVM and Cosmos—and manually link them to access the network’s full features. For developers and infrastructure providers, the situation is even more tangled. Indexers, explorers, and node operators must write custom logic to sync data between two incompatible systems. This overhead increases code complexity, introduces bugs, and slows development.
SIP-3: A proposal from @Sei_Labs to streamline Sei’s architecture to an EVM-only model has been submitted through the Sei Improvement Proposal process.
This proposal aims to enhance developer experience, simplify infrastructure, and fully leverage Sei’s parallelized EVM… pic.twitter.com/nxQ9cGYXj2
— Sei
The numbers speak volumes. Since the release of Sei v2, EVM-based usage has skyrocketed. According to on-chain analytics from SeiScan, over 85% of transaction volume on the network now originates from EVM addresses. Popular apps like Astroport, which ported from Terra to EVM-compatible chains, are part of this trend. The market is speaking—and it’s leaning heavily toward EVM.
The Proposal: Moving to an EVM-Only Architecture
The new governance proposal recommends sunsetting CosmWasm support and committing fully to EVM. Under this plan:
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Only EVM addresses will be able to initiate transactions.
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New CosmWasm deployments and IBC transfers will be disabled.
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CosmWasm contract execution and native Cosmos transactions will be phased out.
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Internal protocol features like staking and governance will still work via precompiles, meaning core functionality will remain.
Technically, the transition hinges on a few key milestones. One is the creation of “EVM pointers”—essentially making existing Cosmos assets accessible from the EVM side. The next steps include turning off CosmWasm contract deployments and, finally, shutting down legacy interactions entirely.
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