Built WhaleTrack — it tracks big Polymarket traders and alerts when they place large bets. Here's the technical stack behind the automated alert system. The core loop (runs every 5 min): Polls Polymarket's API for recent trades across known whale wallets Detects new bets above $10K threshold Sends Telegram alert immediately Waits 10 min (Telegram subscribers get early access) Posts to Twitter with a visual card Tweet card generation: Puppeteer renders an HTML card → screenshot → PNG Uploaded via Twitter media API (v1.1) before posting text via v2 Falls back to text-only if Puppeteer fails One lesson on Twitter character limits: Twitter's 280 weighted char limit counts URLs as 23 chars regardless of length. My referral link was getting silently truncated because the tweet was ~336 weighted chars. Fixed by restructuring the tweet and adding a proper twitterLen() counter. Stack: 1.Node.js (single process, 24/7) 2.Bullpen CLI for Polymarket data 3.Puppeteer for card screenshots 4.Twitter API v1.1 (media) + v2 (tweets) 5.Telegram Bot API 6.Vercel for the web app Live at whaletrack.app. The full alert bot is ~1,200 lines of Node.js. Happy to share specific snippets if useful.