TLDR
- Sei Network will cease support for Cosmos-native assets following the SIP-3 upgrade in March 2026.
- USDC.n (via Noble) users must migrate their funds to native USDC to avoid total loss of access.
- Swap options and manual bridges like Stargate are available to facilitate the transition to an “EVM-only” network.
The Sei network issued an urgent communication to its community this Thursday. They reported that with the SIP-3 upgrade, scheduled for March 2026, the blockchain will complete its transition to become an exclusive Ethereum Virtual Machine (EVM) ecosystem.
This structural shift means the network will stop supporting Cosmos-native assets, directly affecting USDC.n holders. Notably, there are currently more than $1.4 million in USDC via Noble on Sei.
According to the official statement, the USDC.n migration to Sei Network is mandatory for users who wish to preserve the value of their holdings, as the old token could become inaccessible or lose its liquidity entirely after the mainnet deployment.
Options for Performing the USDC.n Migration to Sei Network
To facilitate this process, different routes have been enabled depending on capital volume. For small conversions, users can utilize exchange platforms such as Dragon Swap or Symphony, though warnings have been issued regarding potential slippage variations based on market conditions.
For larger volumes, it is recommended to execute the USDC.n migration to Sei Network through the Brrr tool. This protocol transfers assets from Noble to Polygon and, finally, back to Sei using Circle’s Cross-Chain Transfer Protocol (CCTP).
It is crucial for those providing liquidity in DeFi protocols such as Yei or Takara Lend to withdraw their positions before initiating any transfer. Sei emphasizes that the USDC.n migration to Sei Network via manual bridges like Stargate or intermediary networks like Base is possible, but carries high technical risks.
Sei’s strategic move coincides with an institutional boom for USDC,which is currently outperforming USDT in market capitalization growth percentage, driven by increased demand for regulated stablecoins under the current regulatory framework.
Investors are urged to complete the USDC.n migration to Sei Network well in advance and monitor official channels for any changes to the March 2026 timeline.
