Proprietary Stack Drives Underdog Advantage
Underdog Fantasy
Owning the stack matters in sports betting because the product is not just odds on a screen, it is the speed of launching new bet types, sharing one wallet across fantasy and sportsbook, and tuning the app around the behavior of existing users. Underdog launched its North Carolina sportsbook in March 2024 with the same account and balances used for fantasy, and internal research ties that setup to a broader strategy of moving users from Best Ball and Pick'em into higher value sportsbook play.
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White label sportsbooks usually rent core betting software from a platform vendor. That gets an operator live faster, but product changes depend on the vendor roadmap. Internal evidence on DraftKings notes it spent time on a white labeled product before moving onto its own stack, which shows why control over the underlying system can matter.
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The clearest user level benefit is a unified app. Underdog described customers logging in with fantasy credentials and using balances across both experiences. That reduces friction at the exact moment a fantasy player decides to place a straight bet or parlay, instead of downloading a second app and reentering payment details.
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This does not erase the incumbents' scale. Internal research highlights FanDuel's strength in offering a very broad menu of bets and strong line setting, while DraftKings and FanDuel also bring much larger marketing budgets. The technology edge is less about matching them market for market, and more about shipping differentiated products that blend fantasy and betting faster.
The next phase is a race to turn sports apps into multi product wallets. Operators with their own infrastructure can combine fantasy, sportsbook, and eventually adjacent formats like prediction markets inside one account. That favors companies that can reuse identity, wallet, pricing, and risk systems across products, instead of stitching together vendor software one feature at a time.