Sei Labs has issued a notice to users holding USDC.n on the Sei Network, urging them to swap or migrate the token to native USDC ahead of a planned network upgrade scheduled for late March 2026. The guidance follows preparations for the SIP-3 upgrade, which is expected to transition Sei into an EVM-only chain and discontinue support for Cosmos-native assets such as USDC via Noble.
According to information shared by Sei Labs, the SIP-3 upgrade was accepted by the Sei ecosystem in 2025 and is now approaching mainnet deployment. Once live, the change will remove compatibility with Cosmos-native tokens. As a result, USDC.n balances may become inaccessible or lose functionality on Sei Network if they are not converted beforehand.
At the time of the announcement, more than $1.4 million worth of USDC.n was reported to be circulating on Sei. Users have been advised to complete any required swaps or migrations before the end of March 2026, while monitoring official channels for possible changes to the timeline.
For smaller balances, Sei Labs noted that users may swap USDC.n for native USDC through decentralized exchanges such as DragonSwap or Symphony, with the caveat that slippage can vary depending on liquidity conditions.
For larger balances, a batch migration tool is available that routes USDC.n from Noble to Polygon and back to Sei using Circle’s Cross-Chain Transfer Protocol. The process relies on infrastructure from Circle and Polygon. Users may also attempt a manual migration using a bridge such as Stargate and an intermediary chain like Base, though Sei Labs cautioned that manual methods carry additional operational risks.
Suppliers of USDC.n on DeFi protocols were advised to unwind positions before the upgrade. This includes withdrawing assets from platforms such as Yei and Takara Lend. Current estimates indicate roughly $194,000 of USDC.n supplied on Yei and about $13,000 on Takara Lend, figures that may fluctuate as users rebalance positions.
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