I have found a bug that can be critical for those who are running strategies that produce a lot of trades: the option "Max Transaction Hour" is not working and currently, there is no limit to the number of transactions produced by Ipposnif. Fortunately, Betfair has recently extended this limit from 1000 per hour to 5000 per hour. Anyway, above this limit, you will pay (heavy) extra fees. The fix to this bug will be released soon. To be sure to remain within the limit, you can check how many transactions your strategies are producing from Tools -> System Monitor Consider that a bet below the minimum size produces 2 transactions instead of only one.