Developer Builds Real-Time Whale Tracker for Polymarket Using Public API

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A developer built WhaleTrack, a tool that tracks the largest traders on Polymarket, the prediction market platform that recently surpassed $3.6 billion in trading volume. The app uses Polymarket's public leaderboard API to identify the top 10 traders by profit and loss, then monitors their recent activity every 60 seconds. It alerts users with a banner notification when any tracked wallet places a trade exceeding $5,000 within the last 10 minutes. Built over a single weekend using vanilla JavaScript and a Vercel serverless backend, the project attracted over 129 users in its first few days with no paid promotion. The developer plans to add email and push alerts, more whale wallets, and direct links to matching markets on Polymarket.

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