Sui Mainnet stopped producing blocks on May 28, 2026, triggering an immediate 8% drop in its native token SUI. The Layer-1 blockchain’s core team confirmed a “network stall” and began implementing a fix, pausing transactions while stating user funds remained safeguarded.
Sui’s official status page flagged a major outage for Mainnet validators starting around 07:15 PDT. The network’s official account posted: “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 begun deploying a solution. Explorers including SuiScan showed no new checkpoints or blocks for nearly an hour, halting transaction finality across decentralized applications.
Public RPC nodes remained operational, though settlement and validator coordination were impacted. SUI traded near $0.91 at the time of writing, down approximately 8%.
The incident marks another reliability test for Sui, which launched its mainnet in May 2023. Previous disruptions include a six-hour consensus divergence outage in January 2026 and a two-hour scheduling bug in November 2024. In each case, the network halted safely, recovered through coordinated validator upgrades, and published post-mortems focused on improved testing and detection.
Sui’s object-centric Move language and parallel execution architecture offer high theoretical throughput, but validator coordination under edge cases has raised ongoing reliability questions.
Engineers were continuing to work toward resumption, with updates expected through official channels. A post-mortem outlining the root cause and preventive measures was expected to follow.
Source: Sui Mainnet Stalls, SUI Token Falls 8% During Block Outage