What trades here
The mix of contract categories Rothera lists, and how far ahead of settlement they trade.
The mix, day by day
Sports and everything else
Days to expiration
How far ahead of settlement Rothera actually trades. Volume is where the money moves; open interest is where it sits.
Every bucket, all time
Every category, all time
Rothera's own categories, unbucketed, ranked by all-time volume.
How the buckets are built
Categories are rolled into seven shared buckets so venues can be read side by side. The taxonomy is broad because the broadest venue sets the ceiling — Kalshi publishes one Sports value where others name the sport, and inventing a split for it would be fabrication.
“Other” is not one thing. At Underdog it is the combo bucket; at OG/Crypto.com and DKeX it is a genuine residual, and OG/Crypto.com carries a separate explicit Parlays value. It is mapped per venue rather than globally.