Volume

Returns prediction-market trade volume by category for one completed UTC day. This is a public, unauthenticated endpoint.

date must use the YYYY-MM-DD UTC calendar-date format. Requests may select one day in the rolling one-year UTC window ending before the current UTC day; the current UTC day is not available. The exact earliest supported date is evaluated for each request.

Prediction-market volume begins at 2025-12-15. A pre-launch date, or a post-launch date with any missing source hour, returns 404 NOT_FOUND. The endpoint never synthesizes zero-volume rows for time before launch.

All volume values are non-negative decimal strings. Category rows are flat and ordered with each parent before its descendants. Each category row's volume includes trades assigned directly to that category and to all descendant categories.

Returns prediction-market trade volume by category and UTC hour for one completed UTC day. This is a public, unauthenticated endpoint.

date must use the YYYY-MM-DD UTC calendar-date format. Requests may select one day in the rolling one-year UTC window ending before the current UTC day; the current UTC day is not available. The exact earliest supported date is evaluated for each request.

Prediction-market volume begins at 2025-12-15. A pre-launch date, or a post-launch date with any missing source hour, returns 404 NOT_FOUND. The endpoint never synthesizes zero-volume rows for time before launch or completed zero-volume hours.

All volume values are non-negative decimal strings. Rows are ordered by UTC hour, then with each category parent before its descendants. Each category row's volume includes trades assigned directly to that category and to all descendant categories.