The contract is not implemented in the main networks at the moment
The BetExpress contract allows users to place combo bets. The contract is linked to a specific deployed PrematchCore contract and only takes information about the Conditions from it.
An unlimited number of sub-bets on different Conditions can be included in a single Express, but the maximum possible winnings for one Condition in all bets are limited to a fixed amount of 25,000. There is also another restriction on the maximum net payout for all Expresses at a given moment, which should not exceed a certain percentage of the total pool, currently around 250,000.
The coefficients for the sub-bets are calculated as follows:
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the coefficients for each sub-bet are calculated without margin and with a zero value for "amount".
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All the coefficients are summed up, and the resulting sum is referred to as "oddsSum". The product of all coefficients is also calculated, denoted as "oddsProd".
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To determine the bet amount for each sub-bet, the following formula is applied:
subBetAmount = (oddsProd - 1) * expressBetAmount / (oddsSum - number of sub-bets)where "expressBetAmount" represents the total bet amount on the Express, and "number of sub-bets" is the count of sub-bets included in the Express.
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To calculate the odds with margin (each sub-bet has its own margin corresponding to the ordinary condition), the following formula is used:
expressOdds = the multiplication of coefficients of all sub-bets
The winnings for a combo bet can only be obtained after all the included Conditions have been completed. If a Condition included in an Express is canceled, the combo bet remains valid, but the potential winnings will be adjusted proportionally based on the betting odds of the canceled sub-bet. If all the Conditions included in the Express are canceled, the bettor can claim their bet back.