Sei Network Advises USDC.n Holders to Swap or Migrate Before SIP-3 Upgrade

In a recent announcement, Sei Network has urged holders of USDC via Noble (USDC.n) to swap or migrate their assets to native USDC by the end of March 2026. This advisory comes as the network prepares for the SIP-3 upgrade, which will transition Sei to an EVM-only chain, ceasing support for Cosmos-native assets such as USDC.n.

Impact of SIP-3 Upgrade

The SIP-3 upgrade, which was approved by the Sei ecosystem last year, is anticipated to go live on the mainnet by March 2026. However, this timeline is subject to change, and users are advised to stay updated through official announcements. The upgrade will render USDC.n potentially inaccessible or worthless on the Sei Network if not converted in time.

Conversion Options

Sei Network has provided several options for USDC.n holders to transition their assets:

Swap

For smaller volume conversions, platforms like DragonSwap and Symphony are available for swapping USDC.n to USDC. Users should be aware of possible slippage due to market conditions and are encouraged to conduct thorough research before utilizing any third-party services.

Migrate

For larger amounts, a dedicated tool is available to batch and migrate USDC.n to native USDC. This tool involves transferring USDC.n through Noble, then Polygon, and back to Sei using Circle’s CCTP. While this method offers a streamlined process, users must accept the inherent risks such as technical failures or delays.

An alternative manual migration can be performed via a bridge like Stargate, which requires targeting an intermediary chain and using CCTP to burn/mint native USDC back to Sei. This manual process carries its own risks, including technical errors and security vulnerabilities.

For DeFi Protocol Users

Suppliers of USDC.n on decentralized finance protocols like Yei and Takara Lend should unwind their positions and withdraw assets before the SIP-3 upgrade. Currently, approximately $194k of USDC.n is supplied on Yei and $13k on Takara Lend. Failing to act before the upgrade may result in loss of access to these assets.

Sei Network emphasizes the importance of these actions to prevent any potential loss of access to assets. For further guidance, users can join Sei Network's Discord community for direct support from the team.

For more detailed information, you can visit the official announcement on the Sei Network blog.