This issue has been resolved.

Thank you for your understanding and continued trust in our service.

Arbitrum Sepolia network is currently experiencing a chain synchronization stallment caused by a client version issue following the Sepolia Fusaka update.
Our engineering team has identified the root cause and is actively working to resolve the problem and restore normal synchronization.
We will share further updates as they become available.

Thank you for your understanding and continued trust in our service.