How to track Polymarket whales
A practical guide to finding and following large Polymarket trades, and how to tell a big trade from a good one.
What counts as a whale trade
On WhaleGrader, a whale flag is a single taker trade of $10,000 or more on Polymarket. Fills from the same wallet, market, outcome and side within one hour are merged into one flag, so a whale splitting an order shows up once.
Where the data comes from
Polymarket publishes trades, markets and prices through public APIs: the Data API for trades and wallet activity, the Gamma API for market metadata and resolutions, and the CLOB API for price history. WhaleGrader reads these every 15 minutes.
Big is not the same as right
A $50k buy at 90¢ is mostly a bet that the favorite wins, which the price already says happens about 90% of the time. To judge a whale you have to compare how often they win with how often the price said they would. That is the price-adjusted edge.
A simple routine
1) Scan the live feed and filter to HIGH severity. 2) Open the wallet and check its graded record and sample size. 3) Look at consensus to see whether other proven wallets agree, and check the opposing count. 4) Star wallets you want to keep an eye on and use the Following feed.
Signals worth a second look
Fresh wallets placing large bets, several proven wallets taking the same side, and underdog entries from wallets with a long positive record. None of these is a prediction; they are reasons to look closer.
More guides
- Polymarket leaderboards explained
- How Polymarket markets resolve
- Reading sharp Polymarket odds moves
- What is price-adjusted edge?
- Fresh wallets and 'insider' signals on Polymarket
- Does copying Polymarket whales work?
- Fresh Polymarket wallets: insiders or noise?
- Polymarket whale alerts that don't waste your time
- Pulling Polymarket whale trades with the Data API
- Polymarket sports whales: what big bets on games tell you
- How to read a Polymarket wallet's track record
Data only. Not financial advice.