Guide to online bookmakers – check below the list of online operators offering bookmaker / classic sportsbook services. A bookmaker creates its own betting markets, covering sports and events from all over the world. Users registering with a bookmaker will be betting against the bookmaker, at selected odds offered by the betting agency. In case of bet win, the user gets the winnings from the bookmaker. In case of bet lose, the user loses the money to the bookmaker.