Predictions.io

Predictions.io has a whale tracker that lists large trades on Kalshi and Polymarket, plus Manifold. Each row links out to the trade's own market on its venue.

The page is free to read and needs no account; a free account signup is offered. We found no paid plan. The site says: "We never hold funds or place trades."

18+ to open a Kalshi account (some states require 19 or 21). Laws change, check your state. Legal status of prediction markets varies by state.

People who want a free look at large trades across Kalshi and Polymarket without signing up.

Skip it if you want wallet lookups and trader leaderboards on Polymarket; Polymarket Analytics fits better.

Free to read, no account needed. No paid plan found. Checked Oct 14, 2026 on the official pricing page.

• Free to read, no account needed.
• Covers Kalshi, Polymarket and Manifold.
• Says it never holds funds or places trades.

• We haven't checked its terms or found any independent reputation for it.
• We only checked the whales page; the rest of the site wasn't reviewed.
• Whale trades are research, not a trade signal.

For whale tracking our Best and free pick is Predictions.io, and Polymarket Analytics is the runner-up. Predictions.io covers Kalshi and Polymarket; Polymarket Analytics goes deeper on Polymarket wallets and leaderboards.