Sui Network experienced a major outage on its mainnet, halting block production completely for nearly six hours due to a technical fault. During this disruption, the price of SUI fell sharply, dropping as much as 8 percent in a matter of hours. As users were unable to process transactions, most applications across the ecosystem also came to a standstill.
Technical breakdown hits gas calculation and validators
The root cause of the network outage was traced to a bug in the software module responsible for calculating gas fees. Validator nodes, which drive and maintain the network, stopped finalizing blocks, preventing any new blocks from being added to the blockchain until the issue was resolved.
At the moment the event occurred, no transactions could be validated on-chain and pending transactions accumulated with no progress. The development team quickly identified the faulty update and rolled out an upgrade and rollback process for validators. Once more than two-thirds of the network’s stake transitioned to the upgraded version, block production resumed.
Throughout the incident, RPC endpoints remained operational, allowing users to view their balances, but transaction or protocol activity was not possible. According to the Sui team, there was no loss of assets or chain split during the outage.
The disruption was directly tied to the gas pricing mechanism. This core module ensures users pay accurate fees for transactions on the blockchain. When validators received the erroneous software update, it caused all applications on the network to suspend operations until the rollback was executed.
A quick glossary: A validator is an independent server or node in blockchain networks, responsible for verifying transactions and producing new blocks to support network security.
The Sui development team stated that a bug, which could not be identified during testing, caused validators to fail at finalizing blocks after the update. They confirmed that the network fully returned to normal after implementing the upgrade.
Sui Network has faced similar outages previously, with major incidents also occurring in January 2026 and earlier in 2024. This latest disruption—now the third significant one—has brought renewed scrutiny to Sui’s upgrade processes and validator coordination. The team announced they will publish a detailed report with in-depth analysis of the event.
Market impact: Sharp SUI price drop and liquidity squeeze
As the outage unfolded, the SUI token price reacted quickly in leading crypto exchanges, falling roughly 8 percent amid volatile trading as liquidity dried up. Within hours, SUI’s market capitalization shrank by around $3.7 billion.
During the steep decline, SUI fell below the key $1 support level, breaking through previous consolidation zones. Meanwhile, weak price action in Bitcoin during this period intensified selling pressure for SUI.
| Development | Before | During outage | After |
|---|---|---|---|
| SUI price | $1.10 | $0.99–1.03 | Stabilized near $1.05 |
| Market cap | Approx. $9.2 billion | $5.5 billion | Stabilized |
The turmoil also spread to derivatives markets, causing funding rates to spike and liquidity to drop off even faster, amplifying price swings. Since the network was down, many investors could not adjust trading positions swiftly. Despite all this, ongoing staking and ecosystem investments ensured interest in Sui was not wiped out entirely.
With this being the third major disruption since the beginning of the year, concerns grew among validators over potential risks in Sui’s upgrade mechanisms. After the event, some investors indicated they would be reassessing their network holdings and exposure should a similar issue occur again.
