Underdog vs White-Label Operators

Owning the betting engine matters because it decides how fast a company can launch new formats, connect fantasy to sportsbook in one wallet, and keep more of the economics instead of paying a platform supplier. Underdog was built around its own fantasy product stack, while DraftKings reached vertical integration by buying SBTech and moving onto that internal platform. FanDuel has long paired its own trading layer with third party retail sportsbook infrastructure from IGT in physical venues.

• DraftKings started with a heavier dependence on outside sportsbook technology, then changed course by acquiring SBTech in 2020. That gave it the core rails for odds, account systems, wallet, and launch tools, and let it describe itself as vertically integrated and running a one platform model across DFS, sportsbook, and iGaming.
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• FanDuel has used a more mixed architecture. In retail sportsbooks, FanDuel provided risk and trading, while IGT supplied kiosk and betting terminal technology. That is different from building the entire stack in house, and it shows how major operators often assembled products from specialized vendors as they scaled state by state.
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• For users, this shows up as speed and cohesion. A proprietary stack makes it easier to move someone from a fantasy draft to a Pick'em contest to a sportsbook bet without logging into another system or moving money between wallets. That is why Underdog treats product ownership as part of its strategy, not just an engineering choice.
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The market is moving toward tighter product control. Operators that own more of the stack can ship faster, tailor contest formats, and convert fantasy users into higher value betting customers more smoothly. That favors companies like Underdog and also explains why DraftKings spent heavily to internalize infrastructure instead of staying dependent on external platform vendors.