Uniswap Labs is shifting the operational backbone of its Ethereum Layer 2 network, Unichain, to Optimism under the OP Enterprise framework. According to an announcement cited by multiple outlets, the testnet migration is scheduled for October 13, 2026, with the mainnet following on October 29, 2026.
For end users and developers, Uniswap says the transition is designed to be invisible. The chain ID, deployed contracts, wallet balances, and applications will remain unchanged, and Uniswap v2, v3, and v4 deployments will continue running without interruption. Unichain also remains a Stage 1 rollup with permissionless fault proofs, and contract upgrades stay under Optimism Governance and the Security Council.
On the infrastructure side, the change is significant. Optimism will take over production sequencing, public RPC access, monitoring, and incident response for both testnet and mainnet. The sequencer that orders transactions, the batcher that sends transaction data to Ethereum, and the proposer that submits state claims are among the most consequential operational components on a Layer 2. Moving these to Optimism is a shift from support to direct operations.
Unichain already had a relationship with OP Enterprise, but this expands it. Optimism’s OP Enterprise offers Self Managed and Fully Managed service levels; this arrangement moves Unichain toward direct operation by OP Labs. A key eventual benefit is native interoperability across the OP Stack. Once that feature is live, assets can move between Unichain and other OP Stack chains without a bridge, starting with ETH.
The move follows a broader pattern. Soneium announced a similar arrangement on September 30, assigning the Optimism Foundation and OP Labs support for deployment, sequencer operations, node infrastructure, upgrades, monitoring, and incident response. Ink has also been cited as an earlier example, with the Ink Foundation focusing on applications while Optimism runs the network.
Service commitments include Soneium’s promise of 99.9% monthly uptime and around-the-clock incident response. The Mission Critical add-on advertises 99.95% uptime, a 15-minute initial response for serious incidents, and updates every 30 minutes. However, these are contractual commitments rather than proof of better uptime.
Fallback mechanisms remain tied to Ethereum. L2BEAT lists forced transaction inclusion for Unichain, Soneium, and Ink, with up to a 12-hour delay. Users can submit a deposit transaction to the portal contract on Ethereum; after the sequencing window expires, nodes can derive blocks with those transactions without normal sequencer batches. Withdrawals still require proposal and proof conditions, and all three chains keep a seven-day proof-maturity period. Soneium has additional risk factors: L2BEAT notes it has no functional onchain dispute process and only whitelisted proposers can publish roots, meaning withdrawals could freeze if those proposers fail.
The immediate milestones are the Unichain testnet migration on October 13 and mainnet move on October 29. If those complete successfully, Optimism will operate another established production chain, deepening its role as an operator for Ethereum Layer 2 networks.
