Sui

What is Sui?

Sui is a proof-of-stake blockchain launched in 2023 by Mysten Labs, a company founded by former Meta engineers who worked on the Diem project. It uses the Move programming language and treats assets as individual 'objects', which lets many transactions run in parallel. SUI is the native coin for fees, staking and governance.

What it’s used for

People use Sui for decentralized trading and lending, stablecoin transfers, gaming and NFTs. SUI holders stake with validators through their wallets to earn rewards. Developers also use Sui's sign-in features, such as logging in with an existing web account, to make wallets easier for newcomers.

Role of the SUI token:

Evidence of real use

• Sui's mainnet launched on May 3, 2023. Source
• The Sui Foundation reported three mainnet outages on May 28 and 29, 2026, caused by bugs in a new release; no committed transactions were reverted. Source
• After the May 2025 Cetus exploit, about 162 million dollars of stolen assets were frozen and validators holding nearly 91 percent of stake voted to release them back. Source

How Sui works

Most blockchains track balances in accounts. Sui instead treats every coin, NFT or app item as an object with its own owner and version. If a transaction only touches objects owned by one person, such as a simple payment, validators can process it without waiting to order it against everyone else. Transactions that touch shared objects, like a trading pool, go through full consensus.

That consensus layer, called Mysticeti, lets validators agree on the order of shared-object transactions quickly. Validators are chosen by stake: SUI holders delegate tokens to validators, who earn a share of fees and rewards each epoch of about 24 hours. Gas fees are paid in SUI, and part of each fee funds a storage pool that pays validators for keeping data on chain.

Apps on Sui are written in Move, a programming language first developed at Meta for the Diem project. Move is designed to make digital assets hard to copy or accidentally destroy, which helps prevent some classes of bugs. It does not prevent all of them, as the 2025 Cetus exploit showed when a flaw in an app's math library was abused.

Key moments

1. 2021Former Meta Diem engineers found Mysten Labs to build Sui.
2. 2023Sui's mainnet and SUI token launch on May 3.
3. 2024The Mysticeti consensus engine goes live on mainnet, cutting confirmation times.
4. 2025The Cetus DEX is exploited for about 223 million dollars in May; validators freeze and later return about 162 million dollars.
5. 2026Mainnet halts for about six hours on January 14 and three more times on May 28 and 29 after a buggy release.

Supply

SUI has a fixed total supply of 10 billion tokens. Large portions were allocated to early contributors, investors, Mysten Labs and a community reserve, and they unlock on a published schedule over several years, adding to circulating supply. Staking rewards come from a pre-allocated subsidy fund plus gas fees rather than new minting.

Risks to understand

• Outages: Sui halted several times in 2026, which froze activity until validators upgraded.
• Token unlocks: scheduled releases to insiders and investors keep adding SUI to circulation.
• Intervention precedent: freezing hacked funds protected users in 2025 but showed validators can block specific addresses, a trade-off some users see as censorship risk.
• App-level exploits: Move reduces some risks, but DeFi apps on Sui have still been hacked.
• Price volatility: SUI is a young asset with large price swings.

Last reviewed October 4, 2026 by The Crypto Guide editorial team. Utility Lens ratings are editorial judgments, not investment advice. Market data from CoinGecko. Spot an error? Request a correction.