Phantom will remove Sui support from its wallet on September 24, cutting off in-app access to Sui balances and dapps. Sui assets remain onchain, but users must migrate to other wallets to transact or view funds.
Phantom, a widely used self-custodial crypto wallet, will discontinue support for the Sui blockchain on September 24, 2025. The move, announced a month in advance, means users will no longer be able to view Sui balances, send or swap SUI, or connect to Sui-based decentralized applications through Phantom's interface. While Sui assets will remain onchain and tied to users' credentials, Phantom's decision underscores how much practical control wallet interfaces have over users' ability to interact with a blockchain-even when they do not hold custody of the underlying assets.
Interface Access vs. Onchain Ownership
After the cutoff date, Sui holders who use Phantom will find the network removed from the wallet's network list, with balances and transaction options for Sui disappearing from the app. Existing dapp connections to Sui through Phantom will also break, requiring users to reconnect via a different compatible wallet. According to Phantom's transition guide, users can regain access to their Sui funds by importing their recovery phrase or hardware wallet credentials into another wallet that supports Sui, such as Slush. This separation between onchain ownership and interface access highlights a key risk in self-custody: while a wallet provider cannot erase coins from the blockchain, it can instantly remove the tools and connections that make those coins usable for most people.
User Migration and Security Risks
Phantom's migration instructions vary depending on how users secured their accounts. Those with a recovery phrase can export it from Phantom and import it into a Sui-compatible wallet. Hardware wallet users, such as those with Ledger devices, must follow a separate process to maintain key security. Phantom has warned users to be vigilant against phishing attempts during the migration period, emphasizing that it will never proactively request recovery phrases or private keys. The company's fee waiver for cross-chain swaps is limited to Phantom's own fee on swaps from native SUI to wrapped SUI on Solana, with standard network and exchange fees still applying. The operational guide does not specify how many users will be affected, and neither Phantom nor Sui Foundation has disclosed the reason for ending the integration.
Distribution Power at the Wallet Layer
Phantom's decision to drop Sui demonstrates the influence wallet providers have over which blockchains users can easily access. At launch, Sui support in Phantom allowed users to send, receive, and manage Sui assets, swap SUI, and connect to dapps like Suilend and Bluefin. The wallet's broad user base-reported as 15 million monthly active users in early 2025-made it a significant distribution channel for Sui, though the number of Sui-specific users remains undisclosed. The removal of Sui from Phantom does not affect the Sui blockchain itself, but it does force users to choose between migrating assets to a supported network or switching wallet interfaces, each with its own risks and fees. This kind of interface-level decision can have a real impact on user behavior and network activity, even when the underlying blockchain remains fully operational and permissionless.
Wallet interface changes are not the only factor shaping user access to crypto networks. As seen in other market developments, such as the recent protocol reward adjustments on Ethereum and Solana, infrastructure decisions at the application layer can have ripple effects across user experience, liquidity, and network participation.
Phantom's Sui support went live on January 29, 2025, and was promoted as a way to bring Sui to a multi-chain wallet environment. The wallet's total user base grew from 7 million in December 2024 to 15 million by early 2025, according to company statements. However, Phantom and Sui Foundation have not published figures on how many users actively held or transacted Sui through the wallet, leaving the scale of the impact uncertain.
Wallet interfaces play a critical role in shaping how users interact with blockchains. While self-custody means users retain control of their private keys and onchain assets, the practical ability to transact, view balances, and connect to dapps often depends on continued support from wallet software. When a major wallet removes support for a network, users must weigh the risks of migrating credentials, potential exposure to phishing, and the costs of moving assets. This episode illustrates that the power to shape blockchain access often resides at the interface layer, not just in protocol code or onchain rules.
