See the market move before the rest of the board

A sports betting line movement tracker records every price change on a game, at every book, from the open to the close, so you can see who moved first and who hasn't moved yet. quant+ stores every tick across the sportsbooks and prediction markets it covers, charts each book's price as implied probability, and flags steam: several books, including a sharp book, moving the same side the same way within minutes. The books that haven't caught up are listed beside the move.

Line movement is information, not a signal to follow blindly. This page shows how to read it and where it misleads.

What the tracker records

For every game in the NFL, college football, NBA, college basketball, MLB and NHL:

• The open: the first price each book posted.
• Every change after that, stored with a timestamp.
• The close: the last price before the game started.

On the game page, Price history draws each book's price over time on one chart, measured in implied probability rather than odds. That's deliberate. A move from -150 to -170 and a move from +130 to +115 are hard to compare in American odds. In probability they're both a few points, and you can see them on the same scale.

The market grid also has an Open column, so you can scan a slate and see which games have moved since the open without opening each one.

How a move looks in numbers

Here is a moneyline move on one side of a game (an illustration, not a result):

Time	Sharp book	Book B	Book C
Open	-150 (60.00%)	-150 (60.00%)	-150 (60.00%)
10:02	-165 (62.26%)	-150 (60.00%)	-150 (60.00%)
10:05	-170 (62.96%)	-168 (62.69%)	-150 (60.00%)
10:30	-170 (62.96%)	-168 (62.69%)	-170 (62.96%)

The sharp book moved first, Book B followed within minutes, and Book C sat at the old price for almost half an hour. Between 10:05 and 10:30, Book C was the laggard. That window is what a steam alert is for.

What counts as steam on quant+

quant+ calls it steam when several books, at least one of them a sharp book such as Pinnacle or Circa, move the same outcome in the same direction by a meaningful amount of implied probability within a few minutes. One book adjusting on its own isn't steam; that's often just a book balancing its own exposure.

The steam view lists each move with:

• The game, market and side that moved.
• How far it moved, in probability points.
• The books that moved, in order.
• Laggards: books still posting the pre-move price.

Filter by league and by time window (the last few hours up to the last few days) to review what happened overnight or across a weekend.

Why does the sharp book matter? Bookmakers don't work like stock exchanges. Steven Levitt's study of betting markets found that bookmakers announce a price and make small, infrequent adjustments rather than matching buyers and sellers. Books that take large limits from professional bettors tend to move on information. Books that copy them move later. A move led by a sharp book says more than a move led by a recreational one.

Reverse line movement, and why we don't show it

Reverse line movement usually means the line moves against the side that most bets are on, which is read as sharp money on the other side. To show it honestly, you need reliable data on the share of bets and money on each side. Public "bet percentage" numbers come from a handful of operators and media outlets, cover their own customers only, and rarely say how they're measured.

quant+ does not publish bet splits or a reverse-line-movement indicator. We'd rather show you what every book's price did, which is verifiable, than a percentage nobody can audit.

How to use line movement without fooling yourself

1. Treat the close as the benchmark. Closing prices are good forecasts; a PLOS ONE study found betting odds predicted results better than various quantitative models. If your bets regularly get better prices than the close, you're getting good numbers. That's closing line value, and the bet journal measures it for you.
2. Don't chase a move that's already finished. Once every book has moved, the information is in the price. Betting the new price is just betting the market's number.
3. Check what moved. Injury news moves all books at once. A move that starts at one sharp book and spreads is a different thing.
4. Remember closing lines aren't perfect either. A study of NFL money lines from 2007 to 2016 found the closing lines still failed to fully adjust, but the inefficiencies were unpredictable and varied by season. Movement patterns that worked last year may not work this year.
5. Expect limits if you keep beating slow books. Researchers who bet the gap between books and the market consensus had bookmakers cap their stakes within months, one to $10.45 on a $50 bet.

Line movement inside the rest of quant+

The same price history feeds the other tools. The odds comparison board shows every book's current price next to a de-vigged fair price. The backtest lab lets you test rules such as "bet with the move" or "against the move" on past seasons, and it won't let a rule filter on movement while betting at the open, because that movement hadn't happened yet. The bet journal records the close for every bet you log, so you can see whether your timing is helping.

quant+ never places bets and never connects to your sportsbook accounts. Read the risk disclosure before acting on any move. The quant+ guides explain implied probability and closing line value if you're starting out.

Start free to watch tonight's board move in real time, or see the terminal on the home page.

Quant+ is analytics for informational purposes. 21+. If you or someone you know has a gambling problem, call 1-800-GAMBLER.