Base and Arbitrum allow transaction submission even when the sequencer is halted... withdrawals require a separate process

Base and Arbitrum One both maintain fallback routes that let users submit transactions through Ethereum if their sequencers go down, though the two networks handle this differently. Arbitrum One offers a forced-inclusion path via Ethereum's Delayed Inbox, while Base relies on its own contract and procedural mechanisms. The key distinction is that getting a transaction included on the network is separate from withdrawing assets back to Ethereum, which requires proofs and a completion process. The design matters because sequencer outages are a central liveness risk for rollups, and users need to know their transactions can still be processed without the operator. What to watch next is whether these escape hatches see real usage during any future sequencer downtime and how quickly withdrawals can be completed once a forced transaction lands.