Sui Mainnet Stalls; Validators Pause Transactions, SUI Drops 8%

Sui Mainnet stopped producing blocks on May 28, 2026, when validators paused transaction processing, and the SUI token fell about 8%.

The outage was flagged on Sui’s official status page around 07:15 PDT. Sui posted on its official Twitter account: “Sui Mainnet is currently experiencing a network stall. The Sui Core team is actively working on a solution. Be aware that transactions may be paused at this time. Updates will be shared as soon as they are available.”

By 07:36 PDT, engineers had identified the issue and began deploying a fix. Block explorers showed no new checkpoints or blocks for nearly an hour, stopping transaction finality across decentralized applications that rely on the chain.

Public RPC nodes continued to accept requests, but settlement and validator coordination were affected, preventing confirmed transactions. The core team reported transactions remained paused to protect user funds.

SUI was trading near $0.91 at the time of reporting, down roughly 8% from pre-stall levels.

Sui launched mainnet in May 2023. Previous disruptions include a six-hour consensus divergence in January 2026 and a two-hour scheduling bug in November 2024. In each prior incident, the network halted safely, recovered after coordinated validator upgrades and published post-mortems describing root causes and recommended fixes.

Sui uses an object-centric version of the Move programming language and parallel transaction execution to increase throughput. Those design choices require close validator coordination; the core team indicated the current stall may be related to consensus or processing logic. A full technical report is expected after normal operations resume.

Network operators and users were advised to monitor Sui’s status page and official channels for updates. A detailed post-mortem is likely to follow, outlining the precise failure mode and any planned preventive measures.