Sei urges USDC.n holders to migrate to native USDC ahead of SIP-3 EVM upgrade
Sei Network (Sei Investments) warned holders of USDC.n — Circle’s USDC bridged to Sei via Noble — to swap or migrate balances before a planned SIP-3 mainnet upgrade expected in late March 2026 that will convert Sei into an EVM-only chain. The upgrade will discontinue support for Cosmos-native assets like USDC.n, which “may become inaccessible or lose value” on Sei after the transition. Sei flagged over $1.4 million in USDC.n on the network, including roughly $194,000 supplied on Yei and about $13,000 on Takara Lend. Options recommended: small-volume swaps on DEXs such as DragonSwap or Symphony (subject to slippage and third-party risk); larger-volume migration using the Brrr (Brr) tool which routes USDC.n → Polygon → Sei via Circle’s CCTP; or manual bridge migrations (e.g., Stargate and intermediate chains that support CCTP v1/v2 such as Base). Sei urged DeFi protocol suppliers to unwind or withdraw positions ahead of the upgrade to avoid loss of access and emphasized that all methods carry technical and custody risks. The timeline may change; holders should monitor official Sei and Circle announcements. Primary keywords: Sei, USDC.n, SIP-3 upgrade, native USDC, EVM-only. Secondary keywords: migration, bridge, CCTP, DragonSwap, Brrr tool, slippage, DeFi protocols.
Neutral
The news is largely operational and custodial rather than market-moving for USDC’s peg or broader market sentiment. For USDC.n specifically on Sei, the announcement increases short-term operational risk: holders who fail to migrate could lose access to their tokens on-chain, which could temporarily reduce circulating USDC.n balances on Sei and cause local liquidity stress or price dislocations on Sei-based DEXs. That said, USDC as a global stablecoin (USDC) retains Circle backing and cross-chain tools (CCTP) exist to migrate funds; migrations are feasible albeit with custody, slippage and bridge risks. Short-term impact: potential localized volatility and reduced liquidity for USDC.n pairs on Sei and temporary trading frictions as users migrate. Long-term impact: neutral to slightly positive for native USDC on Sei (consolidation to supported asset standard) as protocols and liquidity shift to native flows, improving interoperability with EVM tooling. Overall, the update does not imply broader depeg risk for USDC; it primarily affects on-chain accessibility and requires trader action to avoid operational losses.