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.

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.