What history exists, and what it can prove

Possible

• Closing line against outcome since 28 October. Graded closing lines with opening line, tier and result from /training-set and /results, in the leagues and markets listed below. A window of days, not seasons.
• Point-in-time board replay since 28 October. /board?as_of rebuilds the board as it was recorded. Fix a decision time, then use only rows observed at or before it.
• Line movement studies since 28 October. The change feed gives each detected move with its detection time. Finer steps exist from 2 November onward.
• Player model error on loaded seasons. Game logs reach back further than lines, so you can test how well a model predicts a stat. That says nothing about beating a line.
• Line against book price since 28 October. Observed book prices beside recorded lines, for the books and full-game keys on /compare.

Not possible

• Multi-season line backtest. No line older than 27 October 2026 is served. Box scores do not substitute for lines.
• Profit on goblin, demon or adjusted lines. PrizePicks does not publish those multipliers and promotions are not modeled, so hit rate is measurable and return is not.
• Tick-level replay before 2 November. Board polling records the state at each poll. Moves between polls were never seen.
• As-of box score features. A corrected box score replaces its earlier value. Current values can leak corrections into an older simulated decision.
• Grading the 27 October capture. No outcome has been matched to it. Grading coverage starts with games on 28 October.

Every league

• The graded line is the closing line: the last line observed at or before the listed start time.
• A game is graded only after it is final and the box score reconciles.
• Over means the actual stat is above the line, under means below. A push is exactly equal.
• A close within 15 minutes of the start is labeled confirmed. An older one is labeled last_observed, and close_gap_seconds says how old.
• A line marked unavailable, or absent for 15 or more minutes while the rest of that game was still observed, voids as pulled_before_start.
• A player who did not play voids. A combo voids if any member did not play. A cancelled or postponed game voids.
• Anything that cannot be computed exactly stays ungraded with a reason. An ungraded row never carries a result.

By sport

Basketball

Full game, overtime included. Fantasy Score uses the published NBA chart, on NBA lines. WNBA second-half and fourth-quarter lines grade when the four quarters account for the player's whole game.

Football

A listed player with no row in a category has 0 there. NFL Fantasy Score uses the published chart and grades on a team whose points are all accounted for by touchdowns on player rows, field goals and kicked extra points. A stat the box contradicts for a team stays ungraded for that team.

Soccer

A player must start. A substitute voids as did_not_start, and an unknown start stays ungraded. Goalie Fantasy Score uses the published chart.

Baseball

A batting line on a player who did not bat voids, and a pitching line on one who did not pitch voids. Hitter and Pitcher Fantasy Score use the published chart.

Tennis

A retired match stays ungraded.

Hockey

Full game, plus first-period lines where the source reports them.

Golf

Lines settle per round, using the round named on the event.

Esports

Map and map-range kills. A map that was not played stays ungraded.

Mixed martial arts

Strike, takedown and time stats from the fight record.