Base’s Retired Flashblocks Feeds Stay Connected Without Sending Data

Base’s retired Flashblocks WebSocket feeds still accept connections but no longer send updates, leaving apps that rely on them without data and requiring developers to migrate subscriptions. Base activated Denim on its mainnet at 1 p.m. ET (18:00 UTC) Nov. 5. The upgrade changed the network’s cadence from one canonical block every two seconds to five complete canonical blocks per second, or one every 200 milliseconds. It also ended the interim pending-state updates Flashblocks provided between complete blocks. The connection behavior can make the migration easy to miss: an app may stay connected to an old Flashblocks endpoint even though the feed has stopped sending data. Developers can move to canonical block and log subscriptions through a WebSocket-capable RPC provider or a node they operate.

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