Free public detail for one prediction-market event by venue + slug: outcomes with probabilities, price snapshots, resolution evidence, crossSourceMatches (the SAME real-world question priced on other venues — read probability divergence directly from it), referenceProbability when present (CoinRithm's canonical cross-venue number: the size-capped weighted median Yes probability across matched real-money venues, weighted by open interest or else liquidity as weightBasis states, with venueCount and spreadPoints and methodologyVersion — quote all three together, venues disagree and the spread says by how much), recent whale trades on the event, related events, related news, and volumeHistory when present (daily volume points captured since 2026-07-02 — read the event's volume trend directly from it). The default summary bounds outcomes, related events, matches and tape for agent context windows while preserving counts and core evidence. Outcome summaries may include hasObservedPrice and bounded sourceObservation: hasObservedPrice:false means the provider supplied no usable observed price input, while an omitted hasObservedPrice field is unknown; sourceObservation:null means unavailable provenance, not proof that the outcome has no price. Neither field is a live, liquidity, or trading guarantee. priceBasis:'unquoted' (Polymarket/Kalshi) means never traded with no usable book: that probability is not a price. Set detail=full only when the untouched provider-rich record is needed. This is the cross-venue research view; for tradability use pm_quote. No API key required.