Gemini Prediction Markets Monitor
Gemini prediction markets · book quality.
Every figure on this page is computed from Gemini's public Prediction Markets API
(/events and /volume) — no authenticated, internal or venue-private data.
Three limits are worth knowing before you quote a number from here:
- No depth. The public feed carries top-of-book prices with no sizes, so order-book depth, depth imbalance and the thin/one-sided/skewed signals are absent rather than estimated.
- Overround covers single-winner events only. A multi-winner market (a podium, say) has no meaningful sum-of-asks, so it is excluded from the average and the dutch-book count. The eligible-event count is shown beside the figure.
- Averages state their own denominator. Spread is averaged over two-sided books only; a one-sided book has no spread a trader could cross.
Sweeping the public event feed…
Market Activity Heat Map
Category → event. Area is traded volume; shading is quote coverage, so a large strongly-shaded block is volume sitting on a thinly quoted book. Category names are printed on each block rather than encoded in colour.
Hourly Traded Volume
Completed UTC days, hourly.
Category Health Matrix
Metrics summarize the contracts currently visible under the filters above.
Dutch Books
Single-winner events whose outcomes are collectively offered for less than $1.00 — every leg quoted, summed at the ask.
All Contracts
The table view for everything above — every value on this page is readable here without relying on colour or hover.