Sequencer Downtime Alert

WHAT IT DOES

Sequencer Downtime Alert watches the current L2 bridge page for the user's connected wallet address, monitors the L2 sequencer status by reading the sequencer's latest block timestamp or health endpoint, detects when the sequencer has stopped producing blocks or is experiencing downtime, calculates the duration of the outage, and displays alerts with outage duration, impact assessment, and recommendations when sequencer downtime is detected. The tool connects to the user's wallet via window.ethereum, reads the latest block timestamp from the L2 provider via eth_getBlockByNumber, compares it against the current system time to detect sequencer inactivity, calculates the duration of any detected downtime, tracks sequencer status changes over time to detect recovery events, and provides actionable recommendations for users during downtime events.

WHERE IT RUNS

The tool runs as a panel inside your browser on L2 bridge pages at https://bridge.arbitrum.io/* and https://app.optimism.io/bridge/*. It works on the Arbitrum and Optimism bridge interfaces where users rely on sequencer availability for transactions. The tool connects to your real EVM wallet extension (MetaMask, WalletConnect, or any wallet injecting window.ethereum) to read on-chain data via eth_call and the ethers library loaded at runtime. No data is sent to any external server; all reads happen directly from the blockchain through your wallet provider.

HOW TO USE

Install the BotGentz extension, navigate to the Arbitrum or Optimism bridge page, and open the Sequencer Downtime Alert panel. Set your downtime detection threshold in seconds (default 30) — the tool will alert you when the sequencer has not produced a new block for longer than this threshold. Select your monitoring interval from the dropdown — 15, 30, 60, or 120 seconds. Choose your alert preference — Panel only, Browser notification, or Both. Click "Monitor Sequencer" — the tool begins reading the latest block timestamp from the L2 network at your chosen interval, compares it against the current time, and tracks the sequencer status. When the time since the last block exceeds the threshold, the tool triggers an alert with the outage duration and impact assessment. When the sequencer recovers, the tool alerts you to the recovery event. The alert log maintains a history of recent alerts for review. Click "Refresh" to manually check the sequencer status, or "Clear History" to reset the alert log.

MECHANISM — SEQUENCER DOWNTIME DETECTION VIA BLOCK TIMESTAMP ANALYSIS

This tool uses a sequencer downtime detection engine that monitors L2 block production to identify outages. The system first connects to window.ethereum and requests the user's wallet address. Using the ethers library loaded at runtime, the tool creates a Web3Provider connected to window.ethereum and calls provider.getBlock('latest') to fetch the most recent block, extracting its timestamp. It then compares the block timestamp against the current system time (Math.floor(Date.now() / 1000)) to calculate the time elapsed since the last block was produced. When this elapsed time exceeds the configured threshold, the tool classifies the sequencer as down. It tracks the start time of the downtime and calculates the duration of the outage. The urgency assessment uses a tiered system: Critical (>10 minutes downtime), High (>3 minutes), Medium (>1 minute), or Low (within threshold). Alerts are triggered when downtime is first detected and when the sequencer recovers, with the downtime duration included in each alert.

THE PANEL

The BotGentz panel is fully draggable, allowing you to position it anywhere on your screen without obstructing the bridge interface. It includes per-site position memory, so the panel returns to your preferred location each time you visit the bridge page. Snap-to-edge functionality lets you dock the panel to any side of the browser window. The panel collapses to a compact icon when not in use and expands with a single click. You can resize it to your preferred dimensions, and pressing the Escape key instantly closes the panel. All interactions are smooth and intuitive, designed to work alongside your bridging workflow.

PLEASE NOTE

This tool requires the free BotGentz extension and a real EVM wallet extension (such as MetaMask) already installed in your browser. EVM chains only — currently supports Ethereum mainnet bridging to Arbitrum and Optimism. This is a monitoring and alert tool only — it does not execute transaction-based actions automatically. The tool cannot guarantee that the sequencer status detection method works for all L2 networks or configurations. It cannot distinguish between sequencer downtime and general network congestion that causes block delays. It cannot read sequencer status from networks that do not expose block timestamps or health endpoints. It cannot predict when the sequencer will resume operation. It cannot read private wallet information or transaction intentions. It cannot account for sequencer maintenance windows or scheduled downtime. All blockchain reads are performed directly through your wallet provider; no data is stored or transmitted beyond your browser. Websites change their layouts and content structures regularly; while we continuously update the extraction logic, some pages may require script updates. Always verify all sequencer status details independently before making any decisions based on the alerts.