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Tech & Protocols · 1 min read

Base Schedules Denim Upgrade for Mainnet Activation on Nov. 5

The deployment will bring 200-millisecond block times to Base while removing Flashblocks subscriptions and pending-state access.

Editorial oversight: Julian Mercer, Chief Editor
Neutral
$ETH $2,270 −4.0%

At a glance Announced

What happened
Base scheduled the activation of its Denim upgrade on mainnet for Nov. 5, introducing 200ms blocks.
Why it matters
Flashblocks subscriptions and pending-state access will be removed, requiring developers and indexers to change integrations.
Who is affected
Developers and indexers operating applications or infrastructure on Base.
Takes effect
Nov. 5
What's next
Mainnet deployment of the Denim upgrade on Nov. 5.
Primary source
thedefiant.io: Base Sets November 5 for Denim's 200ms Mainnet Blocks

Key points

  • Base has scheduled its Denim upgrade for mainnet launch on Nov. 5.
  • The Denim upgrade brings 200-millisecond block times to the layer-2 network.
  • Flashblocks subscriptions and pending-state access will be removed, requiring developer integration updates.

Layer-2 network Base has scheduled its Denim upgrade to activate on mainnet on Nov. 5 1. The upgrade will introduce 200-millisecond block times to the network 1. At the time of writing, Ethereum ($ETH) traded at $2,302, down 2.0% over the prior 24 hours.

The deployment will alter how external infrastructure reads data from the network 1. Under the Denim upgrade, Flashblocks subscriptions and pending-state access will disappear, requiring developers and indexers to change their integrations ahead of the rollout 1.

Developer and Indexer Impact

The planned removal of pending-state access and Flashblocks subscriptions shifts the integration architecture for data providers operating on Base 1. Developers and indexing services relying on legacy endpoints will need to adjust their applications to maintain operational compatibility once Denim activates on Nov. 5 1.

Related development across the broader ecosystem includes network parameter adjustments, such as when Solana Cuts Target Slot Times to 250ms Ahead of 200ms Target during its ongoing performance improvements. For Base, the transition to 200ms block times alongside the deprecation of pending-state feeds marks a significant structural update for client and tooling teams 1.

Sources

  1. [1] Base Sets November 5 for Denim's 200ms Mainnet Blocks — thedefiant.io, October 29, 2026

Written by Basis Desk's newsroom system from the primary sources above and machine-verified against them before publication. Market figures marked "at the time of writing" come from live exchange data. Report an error: corrections@basisdesk.news · corrections policy.

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