How to Find and Follow Polymarket Whales
"Whale" gets thrown around loosely on prediction markets. This guide shows how to inspect historically profitable wallets, identify one-bet concentration, and paper-test them before considering a live copy.
Three signals that separate a real whale from a lucky one
The Polymarket leaderboard ranks by 30-day P&L by default. That's a noisy signal, one massive election bet can put a wallet at #1 even if the trader has been break-even for months. Look for these three signals to filter out luck:
- Volume × time. A wallet that's done $5M of volume across 200+ markets over 6 months has more signal than one that did $500K on three markets.
- Win rate ≥ 55% on closed positions. Below 55% you're betting on someone who needs to be right on enormous edge. Above 65% they're either insiders or genuinely good.
- Diversified market types. A wallet that only ever bets on US politics is a one-trick. A wallet trading politics + sports + crypto + macro shows generalizable skill.
The PolyTortoise leader detail page
When you tap a leader inside the Mini App's Leaders tab, the detail page shows you the data you need to decide:
- 30-day PnL + total volume. Sanity-check the leaderboard rank.
- Recent trades. 25 most recent fills with side, market, price, age. You can eyeball whether their picks make sense.
- Backtest preview. "If you'd been copying $100/trade for the last 30 days, you'd have +$X with N trades." This replays the leader's actual recent trades through the same paper-engine math you'd use to copy them, so you see realistic returns, not the leader's gross PnL.
How to actually start following them
Two paths inside the bot:
Path 1, top wallets in one tap. Type /start and tap "Auto-copy top 3 in paper". Done. The bot picks the current top 3 from the leaderboard cache and mirrors their next trades at $100/trade in paper mode.
Path 2, pick by hand. Run /leaders, browse the top 30, tap a wallet to see their detail page + backtest, then tap + watch to copy. Adjust the per-leader size with /size cryptowhale 250.
Path 3, track any wallet, not just the leaderboard. Run /watch 0xWALLETADDRESS <usdc_size>. The bot subscribes to that wallet's on-chain trades via Polygon WebSocket and mirrors them at your specified size. Works for any wallet, leaderboard or not.
The "alpha bleed" you should care about
Copying a whale isn't free alpha. Every mirror trade has three bleeds:
- Latency bleed. A later copy can fill at a different price. PolyTortoise uses a WebSocket fast path for buys and verifies exits through the REST feed before sizing them.
- Spread bleed. Your fill is at the orderbook ask, not the leader's filled price. On low-liquidity markets you might pay 1-2 cents above the leader.
- Fee bleed. Polymarket charges takers a fee on most categories: none on geopolitics and world events, 4% on politics and finance, 5% on sports and most others, and 7% on crypto. The fee is
shares × rate × p × (1−p), which for a fixed dollar amount isamount × rate × (1−p): $3.50 on $100 of a 50¢ crypto share, more on cheaper shares. Makers pay nothing. Your bot charges its own fee on top; PolyTortoise charges 1% on each filled live copy buy, nothing on exits (paper mode is free).
How much of a leader's edge survives these bleeds depends on the markets they trade and your copy size. That's why paper mode matters: you can see it for your own leaders before real money is involved.
One trap to avoid: blindly copying recently-hot wallets
The Polymarket leaderboard is by 30-day P&L. A wallet that hit one big trade in the last week can dominate the leaderboard while having a long-term Sharpe near zero. Always check the leader detail page's backtest before copying, if their last 30 days of trades replayed at $100/trade would have returned -$200, the leaderboard rank is misleading.