Betfair

Betting exchanges - Better odds by UPTO 50-200% and the ability to bet on both sides of a market's outcome. Back bets and a lay bet which backs a selection to lose. With specialised betting apps and trading software, and with a selection of betting bots for every purpose, there's never been a better time to make the move to sports betting exchanges.

Starting price bets or any of their abbreviations BSP, XSP, BOG, ISP or SP are bets which are matched at set odds for each runner at the close of betting, or when the sports betting market gets suspended before going inplay, for events such as horse racing.  Nowadays, there are multiple options available to the punter, for start price bets.