Glossary / API integration / Devig pair
A ParlayAPI glossary entry

Devig pair

A devig pair is the two opposing prices of a two-way market that, taken together, can be normalized (devigged) into fair probabilities. Both sides must be present, from the same book, at the same moment - a single price cannot be devigged, because the vig lives in the pair.

In practice

# Valid pair: both sides, one book, one snapshot
        Pinnacle:  Team A -108  /  Team B -102
        implied:   51.9%        /  50.5%      sum = 102.4%
        fair:      50.7%        /  49.3%     # divide by the sum
        
        # Invalid: -108 from book A paired with -102 from book B --
        # that's a cross-book quote, not a devig pair

Scanners quietly break when one side of a market is missing or stale: pairing prices from different timestamps or books manufactures phantom edges. Requiring a fresh, same-book, same-snapshot pair is the first data-quality gate of any +EV pipeline.

Where it shows up in ParlayAPI

ParlayAPI responses group outcomes under each book per market, so pair validity is checkable directly in the payload - both outcomes present under the same bookmaker entry. Freshness gating comes from /v1/meta/source-quality; the +EV scanner applies both checks before trusting a fair line.

Related terms

DeviggingStrip the bookmaker margin to a fair probability. No-vig priceA price with the book's margin stripped out. Implied sumImplied probabilities summed across a market. Sharp anchorThe reference book for fair value.