Is there a way to retrieve the opening price (not starting price) and the current price in horse racing?
Opening price and current price
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The current prices are obtained from the MarketBook call. There are two prices on offer most of the time (except when there is none or one). The prices and amounts available (size) depend on whether you can to back or lay. If the price is too low or too high, you can make an offer by trying to lay at a lower price or back at a higher one, in which case your offer sits there until someone accepts it or until you cancel it or until its time runs out (ie: the race ends or the race starts (if there is no in-play betting).
I can't think why you'd want an opening price, but feel free to explain if you wish to. When a market opens, often days before the start time of the event, there is usually a large gap between prices that are available for back and lay bets. Sometimes the gaps might not close across the board until shortly before the event starts. Takea look at UK races for Wednesday and Thursday of this week. Many of the Thursday ones have prices up already, and in most of them you can back at 1.1 or lay at 1000. Which price would you take from that? Most of the time, as the race start time gets closer, the two prices will get to adjacent values, and probably move one way or the other together, reflecting expectations from either punterts or bookies.
You can see which prices, if any, have had matches for a particular outcome already, and for how much money. This would, at least, give you some idea of the history of betting on a horse.


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