Yes, sports arbitrage betting is 100% legal.
All that you are doing when you engage in sports arbitrage trading is placing a series of bets on opposing outcomes of a sporting event, which happens to guarantee a profit. Therefore there is nothing remotely illegal in arb betting.
Arbitrage is also popular in other contexts such as stock markets and Forex (foreign exchange / currency markets) where price differences can be exploited to guarantee profitable trades.
Back to our sports arbitrage frequently asked questions.
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