CoinDesk
Sui mainnet stalled on Thursday, halting transaction processing across the layer 1 blockchain as the project's core team acknowledged the disruption and said engineers were working on a fix.
"Sui Mainnet is currently experiencing a network stall. The Sui Core team is actively working on a solution," the project posted on X, warning that "transactions may be paused at this time." At press time, the team had not disclosed the cause of the incident or an estimated restoration timeline.
The SUI token was down roughly 8% in the 24 hours around the outage, though broader crypto market conditions were mixed and the move could not be cleanly attributed to the stall.
Why it matters
This is the second Sui mainnet outage of the year and the latest in a string of technical disruptions that have hit the network since late 2024. Sui, developed by Mysten Labs and launched in 2023, markets itself as a high-throughput, low-fee alternative to Ethereum and Solana — a positioning that leaves little room for repeated downtime on a network whose pitch to DeFi and gaming builders is uptime and predictability.
Outages remain one of the most-watched reliability signals in crypto infrastructure, particularly for chains competing on performance. Solana's multi-hour halts in 2022-2023 became a defining drag on institutional and developer trust; Sui's repeated stalls invite the same scrutiny from the same audience.
Market impact
The immediate on-chain effect was a complete pause in transaction finality — no new blocks, no DEX swaps, no liquidations cleared during the stall window. Once the network resumes, validators will need to catch up on a backlog of pending transactions, which historically has produced short-lived congestion and fee spikes on previously stalled chains.
For developers building on Sui and for treasuries holding SUI, the pattern is the bigger story than any single incident: a second outage in 2025 keeps the reliability question on the table at exactly the moment the network is fighting for mind-share against faster, more battle-tested alternatives.
Frequently asked questions
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What happened to the Sui blockchain on Thursday?
Sui mainnet stalled on Thursday, temporarily halting transaction processing across the network. The project's core team posted on X that engineers were actively working on a fix, though the cause had not been disclosed at press time.
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Is this the first time Sui has had an outage?
No. The Thursday stall is the second Sui mainnet outage of 2025 and the latest in a string of technical disruptions the network has faced since late 2024, including periods of degraded performance.
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How is the SUI token reacting to the outage?
The SUI token was down roughly 8% in the 24 hours around the outage, though broader crypto market conditions were mixed and the decline could not be cleanly attributed to the stall.
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What happens to transactions during a Sui mainnet stall?
While the network is stalled, no new blocks are produced — DEX swaps, liquidations and other pending transactions pause until validators resume and work through the backlog, which historically can trigger short-lived congestion and elevated fees.
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Why do Sui outages matter for the wider crypto market?
Sui markets itself as a high-throughput, low-fee alternative to Ethereum and Solana for DeFi and gaming applications. Repeated outages undermine the reliability pitch that newer layer 1 chains rely on to attract developers and institutional capital, drawing comparisons to Solana's 2022-2023 halts.
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