n8n Workflow: Finnhub Stock Anomaly Alerts via Gmail

Get hourly Gmail alerts when monitored stocks show unusual price moves

This n8n workflow pulls live stock quotes from Finnhub every hour, checks for abnormal percent changes and intraday swings, and emails you a consolidated Gmail summary only when one or more symbols are flagged as WATCH or ALERT.

What this workflow does

• Runs hourly on a schedule using an n8n Schedule Trigger.
• Monitors a predefined symbol list (AAPL, TSLA, NVDA, AMD, GME).
• For each symbol, calls the Finnhub Quote API via an HTTP Request node to retrieve the latest price and daily change metrics.
• Applies rule-based anomaly checks to classify each stock as NORMAL, WATCH, or ALERT based on percent change and intraday high/low swing.
• Filters out NORMAL results so your inbox only receives actionable information.
• Compiles a single text summary listing each flagged stock and the reason for its flag.
• Sends an email through Gmail, with the number of flagged stocks included in the email subject.

Use cases

• SaaS operators and analysts who want automated “market watch” notifications without building dashboards.
• Automation engineers testing rule-based alerting using external APIs (Finnhub) and email delivery (Gmail).
• Active traders who monitor a small set of high-interest tickers and want consolidated anomaly alerts.

Technical details

• Schedule Trigger for hourly execution
• HTTP Request to the Finnhub Quote API (replace the hardcoded token in the request URL with your own Finnhub API token)
• Code node for symbol list handling and rule-based classification (NORMAL / WATCH / ALERT)
• Filter node to remove NORMAL stocks from the final results
• Gmail node with OAuth2 to send the consolidated anomaly email

Setup summary

Connect your Finnhub API token in the Quote API request, set your Gmail OAuth2 credentials, update the recipient email (and optionally thresholds or symbol list), and deploy the workflow.