Compare odds across venues

See the same event priced on Polymarket and Kalshi side by side, with the best price for each outcome.

Some events are listed on more than one venue. Their compare page puts the prices side by side so you can see where an outcome is cheapest.

Where to find it

On an event page, open the DOXA tab of the order book. Under the note about aggregated depth you will see the link Compare odds across venues.

The link appears only when the event is available on more than one venue and has not finished. Most events have no compare page, and then no link is shown.

You do not need to be signed in to open a compare page.

What the page shows

A summary line with the time of the latest price, what the first outcome trades at on each venue, and the combined volume.
Odds table. One row per outcome and one column per venue, followed by Best price, which names the lowest-priced venue for that outcome. Each venue’s price is its lowest ask, shown as a percentage. A dash means that venue is not quoting the outcome.
Venues. For each venue, its volume, its liquidity and the time of its price. The venue name links to the market on that venue.
Resolution rules. The rules each venue publishes for the event, so you can check that the venues settle the event the same way.

If no venue is quoting an outcome, the page says so and asks you to check back soon.

Act on a comparison

Rules can differ slightly between venues, so read Resolution rules before you rely on a price gap.

To trade, return to the event page and use the trade panel. See Placing orders and Event page. Your order is placed on a single venue.