The arbitrage risk decided by the following factors：

•The level of profit ratio. (Normal less than 3%, too high profit could cause by the bookmakers’ error)
•The level for Bookmakers’ error occur rate.
•IP (The same bookmaker and different account but by same IP login)
•Does the same event bet already? (for the same bookmaker and account)
•Baseball game may have two matches on the same day with same both teams.
•Whether Hockey betting contain overtime？


The factors should to consider in the betting order :


  1. The odds of high and low. (low-odds bet first)
  2. Change speed of bookmakers odds. (fast changing bet first)
  3. The display bet maximum way.(bet first the not show bet maximum bookmaker)
  4. The account’s limit status by bookmakers.
  5. How much in the bookmakers and EWallet balance. (check if need to transfer money)