How PolyKal computes fill estimates and fees, where the data comes from, what the tool does and does not do, and how to reach us.
PolyKal is an independent, read-only research tool for Polymarket and Kalshi. It shows prices, order-book depth, fill estimates, fee rules, settlement rules and publicly visible large trades for markets on both platforms. It does not execute trades or hold funds.
No. PolyKal never declares two markets equivalent. A daily list of suspected matching events is produced from title similarity and settlement-time proximity, and every pair is labelled as a candidate. You decide whether the rules describe the same outcome before comparing them.
No. PolyKal is built on each platform's public data and is not affiliated with, endorsed by, or operated by either platform. Platform names are used only to describe where data comes from.
PolyKal walks the top five visible levels of the order book for the side and amount you pick ($1K, $5K, $10K or $50K), reports the average fill price, how much of the amount actually filled, slippage against the best quote, the platform fee and the after-fee cost per share. If the visible book is too thin, the estimate says so instead of inventing depth.
It depends on the market. On crypto markets the taker rate is identical (0.07); on most other categories Polymarket's taker rate is lower, and Polymarket never charges makers. Spread and depth often matter more than the fee. The compare page shows the after-fee cost for the same amount on both books.
A taker fee applies when your order fills immediately against resting orders. A maker fee applies when your order rests and someone else fills it. Polymarket charges makers nothing. Kalshi charges makers only on series flagged with maker fees; on standard series makers pay nothing. Details are on the two fee pages.
Kalshi data comes from Kalshi's public Trade API; Polymarket data from the Gamma, CLOB and Data APIs. Pages are rebuilt about every 15 minutes and show their capture time; order books can be refreshed on demand; the large-trades feed re-queries every 20 seconds. Nothing is a live feed unless the page says so.
Any market either platform exposes through its public API can be opened by pasting its link or ID into the search box. Whale profiles and leaderboards cover only the addresses and fills PolyKal has captured, which is a subset of all activity.
The resting order size at each price level. Deeper books let you trade a larger size before the price moves against you; thin books mean even a modest order fills at noticeably worse prices than the quote.
No. PolyKal does not place orders, hold funds or connect to exchange accounts. The site has no user accounts, sign-in, alerts or paid features: everything is free to use without registering.
Yes. PolyKal is a read-only research site and does not restrict access by country. Prices, order-book depth, after-fee comparisons, the fee calculator and large-trade data need no account and no VPN. Viewing data is not trading: PolyKal doesn't give access to trading on Polymarket or Kalshi, and whether you may trade there depends on their rules and your local law. Our availability page summarises both.
Email [email protected] with the page URL and, for a discrepancy, a screenshot of the platform's own page. We check against the source and correct confirmed errors in the next build.
Independent tool. Not affiliated with, endorsed by, or operated by Polymarket or Kalshi. Data from public sources. Not financial advice.
How PolyKal computes fill estimates and fees, where the data comes from, what the tool does and does not do, and how to reach us.
PolyKal is an independent, read-only research tool for Polymarket and Kalshi. It shows prices, order-book depth, fill estimates, fee rules, settlement rules and publicly visible large trades for markets on both platforms. It does not execute trades or hold funds.
No. PolyKal never declares two markets equivalent. A daily list of suspected matching events is produced from title similarity and settlement-time proximity, and every pair is labelled as a candidate. You decide whether the rules describe the same outcome before comparing them.
No. PolyKal is built on each platform's public data and is not affiliated with, endorsed by, or operated by either platform. Platform names are used only to describe where data comes from.
PolyKal walks the top five visible levels of the order book for the side and amount you pick ($1K, $5K, $10K or $50K), reports the average fill price, how much of the amount actually filled, slippage against the best quote, the platform fee and the after-fee cost per share. If the visible book is too thin, the estimate says so instead of inventing depth.
It depends on the market. On crypto markets the taker rate is identical (0.07); on most other categories Polymarket's taker rate is lower, and Polymarket never charges makers. Spread and depth often matter more than the fee. The compare page shows the after-fee cost for the same amount on both books.
A taker fee applies when your order fills immediately against resting orders. A maker fee applies when your order rests and someone else fills it. Polymarket charges makers nothing. Kalshi charges makers only on series flagged with maker fees; on standard series makers pay nothing. Details are on the two fee pages.
Kalshi data comes from Kalshi's public Trade API; Polymarket data from the Gamma, CLOB and Data APIs. Pages are rebuilt about every 15 minutes and show their capture time; order books can be refreshed on demand; the large-trades feed re-queries every 20 seconds. Nothing is a live feed unless the page says so.
Any market either platform exposes through its public API can be opened by pasting its link or ID into the search box. Whale profiles and leaderboards cover only the addresses and fills PolyKal has captured, which is a subset of all activity.
The resting order size at each price level. Deeper books let you trade a larger size before the price moves against you; thin books mean even a modest order fills at noticeably worse prices than the quote.
No. PolyKal does not place orders, hold funds or connect to exchange accounts. The site has no user accounts, sign-in, alerts or paid features: everything is free to use without registering.
Yes. PolyKal is a read-only research site and does not restrict access by country. Prices, order-book depth, after-fee comparisons, the fee calculator and large-trade data need no account and no VPN. Viewing data is not trading: PolyKal doesn't give access to trading on Polymarket or Kalshi, and whether you may trade there depends on their rules and your local law. Our availability page summarises both.
Email [email protected] with the page URL and, for a discrepancy, a screenshot of the platform's own page. We check against the source and correct confirmed errors in the next build.
Independent tool. Not affiliated with, endorsed by, or operated by Polymarket or Kalshi. Data from public sources. Not financial advice.