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).
