Outright markets are many-runner and high-margin: a 156-player golf field or a 20-team league table sums to a large overround, and long-shot prices carry most of it (favorite-longshot bias). Exchange-traded outrights (see exchange) typically price the same market much tighter than fixed-odds books.
Outright markets carry the outrights-style keys in the market catalog (/v1/meta/markets), following the-odds-api conventions so drop-in integrations keep working. As with all multi-way markets, devig across the whole field - not one price at a time - to recover fair probabilities.