Betfair Exchange Market Replay

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Reading the display

Price Ladder: 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.

About this demo

This replay uses data captured from the Betfair Streaming API on a real WIN market. The price ladder shows available-to-back and available-to-lay volume at each price point as it was recorded during the live market. The LTP chart traces the last traded price over time, and the Weight of Money gauge shows the balance between backing and laying liquidity.

The Betfair Streaming API delivers market state changes as a compressed JSON delta stream over a persistent TCP socket. A live trading system processes this stream in under a millisecond per update, maintaining its own in-memory order book. This demo plays back that same data structure at a controlled speed so you can observe how price and volume evolve in the minutes before race-off.

Data: Real Betfair WIN market · Streaming API delta feed Technology: Java · Betfair Streaming API · Spring Boot Read: Betfair Streaming API in Java →