The majority of data is provided by TXODDs through an existing commercial arrangement. Bet Radar is also used provide data that is not available via TX Odds as below.
The TX Odds Overrounds are captured for Betfair Sportsbook and the referenced competitors every thirty minutes. The data is captured from 23 hours to kick-off of every game in the referenced competition until 30 minutes to kick off inclusive. bookmakers365.com
For each competition the Overrounds reported for Betfair Sportsbook and referenced competitors in an aggregation of these 30 minute snapshots.
That is to say, for each competition the Overround reported is the average Over round of the Match Odds market across each game in each thirty minute snapshot.
All Bet Radar data supplied is based on closing prices. That is to say, the price for all given selections at kick-off.