Price Anomaly Detection & News Alert (Marketstack + HN + DeepL + Slack) Overview This workflow monitors a stock’s closing price via Marketstack . It computes a 20-day moving average and standard deviation (±2σ) . If the latest close is outside ±2σ, it flags an anomaly , fetches related headlines from Hacker News , translates them to Japanese with DeepL , and posts both original and translated text to Slack . When no anomaly is detected, it sends a concise “normal” report. How it works Daily trigger at 09:00 JST Marketstack: fetch EOD data Code: compute mean/σ and classify (normal/high/low) IF: anomaly? → yes = news path / no = normal report Hacker News: search related items DeepL: translate EN → JA Slack: send bilingual notification Requirements Marketstack API key DeepL API key Slack OAuth2 (bot token / channel permission) Notes Edit the ticker in Get Stock Data . Adjust N (days) and k (sigma multiplier) in Calculate Deviation . Keep credentials out of HTTP nodes (use n8n Credentials).