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1852 players across 4 leagues carry a measurable prop history here — 45 league-market records built from 555434 logged player-games. MLB is the deepest, with 1019 players across 5 markets. Each page below answers the same question for one market: where the coin-flip line sits, how far the field spreads around its average, which players swing and which do not, and how much venue matters. All of it is counted from official box scores, and all of it describes games already played. No prices, no projections and no ranking of what to bet.
| League | Players measured | Markets | Logged player-games |
|---|---|---|---|
| NBA | 506 | 14 | 345739 |
| NFL | 112 | 14 | 8120 |
| MLB | 1019 | 5 | 117397 |
| WNBA | 215 | 12 | 84178 |
Every page under this one answers the same question in a different market: given every player with a real game log, how has this statistic actually behaved? The tables are built from official box scores, one row per game played, and each page states the window it measured and the date it was measured as of.
The column these pages are organised around is the coin-flip line — the threshold at which a player’s own log splits closest to even. It is not a line anyone is offering, and it is not a recommendation to take either side of one. It exists because it is the fairest single summary of where a player sits in a market: an average tells you the middle of a distribution, and a threshold tells you how often the distribution clears something.
Two things this section deliberately does not do. It does not quote a price, because a page rebuilt once a day cannot correct a number that moves through the afternoon, and a stale price is worse than none — prices and hit rates against them live on the prop pages, which load them live. And it does not rank anything by how good a bet it is: every ordering here is by sample depth or by measured spread, both of which are descriptions of what has already happened.
One page per league and market, describing how that market has actually behaved: where the coin-flip line sits across the field, how far players spread around their own averages, the size of measured home and away gaps, and who has moved recently against their own log.
Neither. Nothing on these pages is ordered by how good a bet it is, no price appears anywhere on them, and every figure is a count of games that have already been played. Parlay Builder does not accept wagers, hold funds or settle bets.
Daily, from the same box-score tables the rest of the site reads. Each page states the window it measured and the date it was measured as of, so you can see how fresh it is rather than having to assume.
Every prop page on this site is about a slate — the players the books have priced for the next few days. These pages are about the other question, and it is the one that does not expire: how a market actually behaves over a whole league. Where the coin-flip line sits for a typical player, how far the field spreads around its own averages, which records are steady and which swing, and how much playing at home has been worth.
Official box scores, one row per game actually played, summarised per player and per market. Nothing here is projected, nothing is adjusted, and no price appears anywhere in this section — a price moves through the day and these documents are rebuilt once, so a number taken from a book would be wrong by morning. A threshold on these pages comes from a player’s own distribution instead, which is a fact about games that have been played and stays true.
Not picks, not predictions, and not a ranking of what to bet. The tables are ordered by how much evidence there is, by measured spread and by the size of a measured gap — never by how good a bet something is. Past performance does not predict future results, and Parlay Builder does not accept wagers, hold funds or settle bets.
One page per league and market, describing how that market has actually behaved: where the coin-flip line sits across the field, how far players spread around their own averages, the size of measured home and away gaps, and who has moved recently against their own log.
Neither. Nothing on these pages is ordered by how good a bet it is, no price appears anywhere on them, and every figure is a count of games that have already been played. Parlay Builder does not accept wagers, hold funds or settle bets.
Daily, from the same box-score tables the rest of the site reads. Each page states the window it measured and the date it was measured as of, so you can see how fresh it is rather than having to assume.
Odds and lines come from licensed data feeds and refresh on a schedule; hit rates, edges and grades are Parlay Builder’s own calculations.