Polywhaler is a great free feed of large Polymarket bets. But a feed only tells you that a whale bet — not whether that wallet is sharp, or whether the same outcome is mispriced on another venue. WhalesInsider is the alternative for traders who want the edge, not just the alert.
On prediction markets, price moves in seconds. Free sees the same whale bet — too late.
Free (15 min delay)
Whale buys YES @ 42¢ · you see it @ 54¢
Edge gone — worse fill or missed trade
Premium (instant)
Same alert · you copy @ 43¢
Copy smart money while the book still moves
Credit where due: Polywhaler is the most popular free tracker for a reason. If all you need is a no-cost stream of big trades, it does that job.
WhalesInsider keeps the real-time whale feed and adds the two things a pure alert bot cannot: a quality signal on each wallet, and an edge check across venues.
Honest answer: if you just want a free firehose of big bets, Polywhaler is fine. If you want to know which whales are worth following and where the mispricings are, WhalesInsider is the upgrade — and it also has a free tier, so you can compare risk-free.
Yes — it covers the same real-time large-bet alerts and adds an accuracy-based Insider Score, cross-venue arbitrage and one-click copy. If you only need a free alert stream, Polywhaler is simpler; if you want an edge signal, WhalesInsider goes further.
There is a free tier (large-bet feed with a short delay and masked direction). Premium (19 / 99 / 149 USDC monthly / yearly / lifetime) unlocks real-time alerts, whale direction, full wallets and copy.
Score each wallet by historical accuracy, and detect cross-venue arbitrage across Polymarket, Kalshi, SX Bet, Azuro and Limitless with net edge after maker/taker fees — neither of which a pure alert bot provides.