Who sells parlays, and how long are they?

Volume-weighted over each venue’s own window, shown beside the bar; the tick is its last days.

Kalshi’s share is of its whole book, not just sport — every other venue here is a sportsbook.

Every venue with a parlay product, through . Kalshi is on a far larger scale, so the log view is the one that shows the smaller venues.

Dollars of trade value: contracts × price. Kalshi shows its taker-YES stake, Novig its taker value; the other venues publish no side, so their figure is the same trade value without that label.

Only Kalshi and Novig name a taker. No other venue on this page does, so no other taker series can be drawn here, and nothing is drawn as a stand-in.

OG/Crypto.com, Underdog and Polymarket US publish no leg breakdown — absent here, not zero. DKeX publishes none either, but its settlement report names every leg, so the count is recovered rather than reported.

Dollars staked on parlays over the 30 days to 17 October 2026, by exchange. Each exchange reports its own stake: Kalshi's parlay handle, Polymarket US's bets with cash-outs left out, and the parlay stake each other exchange publishes. Novig counts only parlays of two or more legs.

Seven exchanges, about in total. Shares compare sizes; each exchange measures its stake its own way, so they are not like-for-like.