Sei Network confirmed inbound IBC transfers were disabled by mid-May 2026, after a governance vote activated the mechanism shipped in the v6.4 mainnet upgrade on April 13. The chain's exchange migration deadline was June 15. Holders of five Cosmos-native assets on Sei can still bridge out today; no date for the follow-on vote to close outbound transfers has been set.
The five assets at risk: how to exit
The five assets Sei Labs has specifically named are USDCet (Wormhole USDC from Ethereum), USDCop (Wormhole USDC from Optimism), USDTbs, ATOM, and WBTC. The official guidance is to bridge out using Skip:Go or the relevant bridge interface, and to close DeFi positions before withdrawing. Once the outbound vote passes, Sei Labs says holders who miss the window "may lose access to their assets."
The June 15 exchange cutoff carries a separate consequence for custodians and trading platforms. Sei's documentation states that after that date, "exchanges and their users will not be able to access or transfer funds" through Cosmos-native interfaces. Exchanges that completed address association before the deadline, linking sei1... and 0x... EVM addresses on-chain, retain access; those that did not face a manual recovery process.
SIP-3: Sei's governance-ratified break from Cosmos
Both deadlines are part of SIP-3, the governance proposal the Sei community passed in Q2 2025 to drop CosmWasm and Cosmos transaction support in favor of a fully EVM-compatible chain. Co-founder Jay Jog framed the tradeoff: "To make something faster, you either have to add power or reduce weight. To make something a lot faster, you do both." The resulting architecture, branded "Sei Giga," targets more than 200,000 transactions per second by removing hundreds of thousands of lines of Cosmos-related code. No launch date for Sei Giga has been set.
