Futures lock up capital for months and carry high overrounds (a 30-team championship market often sums far past 120%), so the effective price of entertainment is steep. Their strategic use is capturing a number before news moves it, then hedging near settlement - holding a +2000 preseason ticket into a final creates a guaranteed-profit hedge on the opponent's moneyline.
Where a sport carries futures/outright markets, they appear under their own market keys in the catalog at /v1/meta/markets, alongside the event-based markets, across ParlayAPI's 90+ covered sports. The same implied-probability math applies - just expect much larger vig than on game lines.