OG

OG is one of the newest entrants in the US prediction market space, building a platform specifically designed to make event-contract trading accessible to American users at a time when the category is growing rapidly post-Kalshi's regulatory breakthrough. The app takes its design cues from clean consumer fintech: onboarding is straightforward, depositing funds is easy, and finding markets to trade is intuitive.

The market catalog covers sports outcomes (game winners, championship futures, player performance), current events (policy decisions, election results), business and economic releases, and entertainment events. OG has positioned sports prediction as a primary category — the breadth and depth of sports markets is a deliberate competitive choice against Kalshi's primarily political and economic focus.

Our verdict on OG

OG earns the second-highest score in this category as the best complement to Kalshi for US prediction market participants. Where Kalshi dominates on economic and political contract depth, OG has built a compelling sports-focused catalog that gives serious prediction traders a meaningful second platform. The lower App Store review volume is a function of age, not quality — the trading experience is clean and the payouts are reliable. This is the prediction market platform to watch as it scales.

How it works

OG uses the standard binary event contract model: contracts represent yes/no questions about real-world events, trade between minimum and maximum price, and pay out $1 on resolution to the correct side. The mobile app presents markets in a feed format organized by category, with trending and featured contracts surfaced at the top. Opening a position follows a simple buy/sell flow — choose your side, set your stake, confirm. Live market prices update in real time as other traders move the market.

The platform's promotional events are designed to bootstrap liquidity on new market types — OG has run structured prediction challenges with prize pools that reward accuracy across a set of related contracts, which draws in volume and improves spreads during the early market phase.

Markets & liquidity

OG's sports markets are the strongest in its catalog — game outcome contracts for NFL, NBA, MLB, and NHL events, plus futures and player-level markets. The sports coverage is more granular than Kalshi's sports offering, making OG a natural complement for prediction traders who want depth on specific game and player outcomes rather than just league-level futures.

News, politics, and entertainment markets are growing but smaller in volume than the sports catalog. Liquidity on these markets is improving as the user base grows — this is the primary area where OG trails Kalshi, which benefits from years of liquidity accumulation on political contract types.

Payouts & fees

OG processes payouts via bank transfer and ACH. Withdrawal times are competitive and the platform has demonstrated reliable payout execution. Fee structures are disclosed in the app's help center; OG has used promotional zero-fee periods during the platform's growth phase to attract trading volume.

Availability

OG is available to US users. The platform operates within the US prediction market framework and does not impose state-level restrictions based on geographic blocking. The iOS app is available on the App Store at id6757954676; the Android app is available via Google Play. Verify current availability terms at the OG platform website, as access policies may evolve with regulatory developments.

Final take

OG is the prediction market platform to open after Kalshi. Its sports-focused catalog, clean interface, and US accessibility make it a genuine second account for prediction traders who want broader market coverage than any single platform provides. The growing user base and active promotional calendar signal a platform investing in liquidity — the kind of investment that makes early accounts increasingly valuable as trading depth improves. [AFFILIATE: App Store URLs as fallback — direct affiliate links to be added by Chris]