Coinbase’s Base sequencer struggles with instability, raising scalability concerns

Base, the Ethereum Layer-2 network built by Coinbase, is facing renewed scrutiny over the stability of its sequencer, the single piece of infrastructure responsible for ordering transactions and producing blocks. Reports from users and developers point to ongoing instability that is limiting the network’s ability to scale under pressure.

Here’s the thing about sequencers: they’re the air traffic controllers of Layer-2 networks. Every transaction flows through them before getting bundled and posted to Ethereum. When the sequencer goes down, the entire network effectively freezes. And Base’s sequencer, which is operated solely by Coinbase, has been freezing at some inconvenient moments.

A pattern of outages that won’t quit

The instability isn’t exactly new. In February 2025, Base experienced a downtime incident tied directly to sequencer performance issues. A separate 33-minute outage occurred in 2025, caused by a failed sequencer handoff during a period of high onchain activity.

The root cause is structural. Base runs on a centralized sequencer, meaning one operator, Coinbase, handles all transaction ordering. If the single sequencer fails, there’s no failover mechanism that kicks in automatically to keep the network running. This architecture is common among OP Stack-based rollups, which Base is built on.

What Base is doing about it

In early 2025, Base launched its Appchains initiative, designed to provide dedicated blockspace with 1-second block times. The Appchains rollout, which began in February 2025, represents Base’s most significant scalability push to date. By offloading some transaction volume to purpose-built chains, Base aims to reduce the burden on its main sequencer.

Base has also been transitioning to a unified Reth-based codebase. Reth is a Rust-based Ethereum execution client known for its performance efficiency. Moving to a single, optimized codebase should theoretically improve how quickly the sequencer processes transactions and reduce the kind of handoff failures that caused the 33-minute outage.

Neither of these initiatives addresses the elephant in the room: decentralization of the sequencer itself. As long as Coinbase remains the sole operator, the network carries concentration risk that no amount of Appchains can fully mitigate. The team has signaled intentions to move toward greater decentralization, but concrete timelines and mechanisms remain unclear.

Notably, Coinbase and Base have not issued public statements addressing the scalability concerns in recent weeks.

What this means for investors and users

Base doesn’t have a native token tied to sequencer operations. Unlike some Layer-2 competitors where token holders have direct exposure to network performance, Base’s revenue model runs primarily on transaction fees.

Base operates in an increasingly crowded Layer-2 market where alternatives like Arbitrum, Optimism, and newer entrants are all competing for developer mindshare and user activity. Base has become an increasingly important part of Coinbase’s strategic positioning, giving the company a foothold in onchain infrastructure beyond its exchange business.

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