Arbitrage betting is possible in California, just not through traditional sportsbooks like FanDuel or DraftKings, since online sports betting is not legal in the state.
California players can still find arbitrage opportunities on betting exchanges and prediction markets such as ProphetX, Novig, Kalshi, and Polymarket, where the same outcome can appear at noticeably different prices across platforms.
If you want to arbitrage bet in California, check out the free Odds Assist Pro arbitrage bet finder that scans these exchanges and flags price mismatches that result in an arb.
How to Arbitrage in California on Betting Exchanges
On betting exchanges like ProphetX and Novig, you are not betting against the house. You are buying and selling positions against other traders, so the price is whatever the crowd is willing to pay at that moment.
That is why arbs show up more often. One platform can be a few cents off because the order flow is lopsided, and you can take advantage by grabbing the better price there and taking the other side somewhere else, like another exchange or a prediction market app (more on those in the next section).
When the numbers are far enough apart, you end up covered either way.
Most betting exchanges offer signup promos, which can make them useful for bonus bet arbitrage, where you use promo funds on one side and hedge on another platform.
Arbitrage Betting in California via Prediction Markets
Prediction market apps like Kalshi and Polymarket list outcomes as probability-based contracts instead of traditional odds. You are buying “Yes” or “No” shares priced as percentages, which makes it easy to compare one platform against another.
Arbs show up when those probabilities drift apart. If one platform prices a team to win a championship at 62%, while another market implies closer to 68%, that gap creates room to take opposite positions and lock in the difference.
You know you found an arbitrage opportunity on a prediction market if the sum of the Yes and No prices is under 100%.
For example, if Yes for the Eagles to win is at 55% on one app, but another has No for the Eagles to win at 40%, you could take both sides and profit no matter the result.
You can also pair a prediction market position with an exchange if the numbers line up.
These inefficiencies occur more frequently on prediction markets because liquidity is unevenly distributed. One platform might be deeper and more active, while another moves more slowly, and that lag is where sharp traders find opportunity.
Can You Arbitrage Using DFS in California?
DFS pick’em apps are available in California, and they allow you to choose Higher/Lower on player stat projections.
You can't really find arbitrage on DFS apps because they require you to choose at least two different players in entries, so you can't cover all possibilities of an event.
Offshore Sportsbooks: Another (Risky) Option for California Arbs
Offshore sportsbooks such as Bovada accept players from California, creating another arbitrage opportunity. Since they operate outside U.S. state regulation, they can legally take action from CA residents even though in-state sportsbooks are not live.
You can use offshore books as one side of an arb against a betting exchange, or even against another offshore book if the prices are far enough apart. Price gaps tend to appear around high-traffic games when lines move quickly, and not every platform adjusts at the same pace.
The tradeoff is risk. Offshore books are not regulated by California authorities, which means there are no local consumer protections if something goes wrong.
Withdrawals, account limits, or disputes are handled internally by the operator, so you are relying on the book’s own policies rather than a state regulator.
