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Summary

Sporting Index and IG Sport offer bonuses that involve spread betting. Spread betting returns a variable payout depending on the accuracy of the bet. For example, you might make a buy bet of 10 per goal for each goal above 2.5. If the game had 5 goals, the bet would return (5 - 2.5) * 10 = 25 in winnings. If the game had no goals, the bet would return (0 - 2.5) * 10 = 25 in losses.

As shown in the example above, spread betting often gives the opportunity to win or lose much more than your initial bet. One way to reduce this high variance in payout is by using matched betting. In the example above, you might make a buy bet at 2.5, at one sportsbook; and make a sell bet at 2.4, at a 2nd sportsbook.