Sonne Finance Review: Should You Use It in 2026?

Sonne Finance describes itself as a permissionless lending protocol. In the usual lending-market model, you supply supported crypto assets and may earn interest; borrowers post collateral and borrow against it. The project interface lists supply and borrow markets, and also displays staking and swap options. SONNE is the associated token.

Those functions are not a recommendation to use them. Sonne Finance's site warns that the protocol was exploited and says not to interact until further notice. A May 2024 report put the loss at about $20 million, but current information about recovery, affected contracts or a restart is not established. Treat the warning as decisive: don't connect a wallet or try to test whether individual functions still work.

Sonne Finance does not publish fee details in the information available. In lending protocols generally, suppliers and borrowers may face interest rates set by market conditions, and blockchain transactions require gas. The interface also lists staking and swapping, but their current costs and availability are not established.

Even if you could see rates or transaction estimates in a wallet, that would not establish that the markets are safe or that funds can be withdrawn. With an exploit warning active, don't use displayed rates to judge the protocol's value. The practical cost to weigh is the risk of losing funds or being unable to access them. Wait for a clear official update that addresses the incident, affected contracts and any user recovery process before reconsidering the protocol.

The central trust issue is the exploit. Sonne Finance's site itself warns users not to interact, and a May 2024 report put the loss at about $20 million. The current status of remediation, affected markets and user recovery is not established, so don't assume the incident has been resolved or that funds are safe.

No audits are listed. That does not prove that no code was ever audited, but it means you should not treat an audit as a reason to trust the protocol. The project describes itself as decentralized and open source; neither description removes smart-contract, market or operational risk. Licensing, custody arrangements and a current security review are not established. Until the project publishes a clear incident update and evidence of a safe operating status, avoid depositing, borrowing or connecting a wallet.

Sonne Finance is associated with Base and Optimism; the project's own description specifically mentions Optimism. Its interface has displayed wallet connection and market functions, but the active exploit warning overrides any normal sign-up guidance. There is no safe way to assess current usability by connecting a wallet while the project says not to interact.

If you already used Sonne Finance, don't assume that switching chains or using another interface removes the risk. The information available does not establish which contracts or markets were affected, whether withdrawals are safe, or what recovery options exist. Look for an official incident update through the project's established communication channels without connecting to the app. If you have funds or token approvals involved, get chain-specific help before making transactions; don't follow unsolicited messages promising recovery.

The active warning is the clearest reason to choose another protocol: users are told not to interact, while the current status of remediation and funds is not established. Fees are not published, no audits are listed, and licensing and custody details are not established. These gaps matter even more after a reported exploit.

For now, there are no sensible steps to start using Sonne Finance safely. Don't connect a wallet, supply assets, borrow, stake or swap. Check for a clear official update that lifts the warning and explains what happened, which contracts are safe, whether markets have resumed and what affected users should do. If that information is absent or unclear, continue to stay away. Don't rely on a token price, a market listing or a third-party claim that the protocol is operating normally as proof that using it is safe.