The exchange order book. Blue (Back) shows money available from layers — click to take a back bet. Pink (Lay) shows money from backers you can lay against. Bar width represents relative size at each price level.
LTP
Last Traded Price — the most recent price at which a bet was matched. The chart traces its movement over the 16-minute replay, from pre-race trading through to in-play.
Weight of Money
The ratio of available back money to lay money across all visible ladder levels. When blue dominates, more money is sitting on the back side, typically a signal the price will shorten. Pink dominance suggests drifting odds.
Velocity
Rate of LTP change over the last 5 seconds. Positive (red) means drifting odds; negative (green) means shortening. A key signal in automated trading strategies.
In-Play
The vertical dashed line on the chart marks the moment the race goes in-play. Betfair suspends the market briefly at the off, then reopens with in-play betting enabled — watch how the order book thins sharply at that moment.