[Urgent] MegaETH - Mainnet - Rex5 Hardfork Upgrade to v2.0.21

Scheduled Maintenance Report for Quicknode

Completed

Maintenance has been completed.

Posted Jun 02, 2026 - 13:05 UTC

In progress

Scheduled maintenance is currently in progress. We will provide updates as necessary.

Posted Jun 02, 2026 - 07:30 UTC

Scheduled

We are upgrading our MegaETH Mainnet infrastructure to v2.0.21 ahead of the mandatory Rex5 hardfork.

The hardfork changes execution semantics. This release also upgrades MegaEVM to v1.5.3, adds a sequencer signature in mini-blocks, and improves WebSocket connection observability.

During the maintenance window, customers may experience intermittent disruptions to RPC availability as nodes are rotated through the upgrade process.

RPC Changes:

Mini-block format — sequencer signature has been added; clients consuming raw mini-block data may need to account for the new field.

WebSocket — observability improvements have been added to WebSocket connections; no functional behavior change for client integrations.

Release: https://docs.megaeth.com/spec/network-upgrades/rex5

Posted Jun 01, 2026 - 18:57 UTC

This scheduled maintenance affected: MegaETH (Mainnet - JSONRPC API, Mainnet - Websocket API).