Comparison · updated July 2026
Interactive Brokers Forecast Contracts vs Underdog Fantasy
Interactive Brokers Forecast Contracts and Underdog Fantasy are two of the most discussed prediction market platforms in the US. Here's a side-by-side look at how they compare on the factors that actually matter for traders.
Interactive Brokers Forecast Contracts
CFTC-regulated event contracts inside the IBKR trading platform.
Underdog Fantasy
Daily fantasy and pick-em products, adjacent to event contracts.
Rating
Interactive Brokers Forecast Contracts
4.1
Underdog Fantasy
4.2
Best for
Interactive Brokers Forecast Contracts
Existing IBKR clients
Underdog Fantasy
Sports pick-em fans
Regulation
Interactive Brokers Forecast Contracts
CFTC-regulated
Underdog Fantasy
DFS regulator patchwork
US availability
Interactive Brokers Forecast Contracts
Available
Underdog Fantasy
Available
Fees
Interactive Brokers Forecast Contracts
$0.02–$0.10 per contract
Underdog Fantasy
Standard DFS rake
Mobile
Interactive Brokers Forecast Contracts
Good
Underdog Fantasy
Good
Markets
Interactive Brokers Forecast Contracts
Economy, Financial events, Politics
Underdog Fantasy
Sports
Payment
Interactive Brokers Forecast Contracts
Underdog Fantasy
Founded
Interactive Brokers Forecast Contracts
Underdog Fantasy
Verdicts
Who wins, category by category
Best for beginners
Interactive Brokers Forecast Contracts
Cleaner onboarding and a more polished consumer experience.
Best for regulation
Interactive Brokers Forecast Contracts
Operates as a CFTC-designated contract market.
Best for liquidity
Interactive Brokers Forecast Contracts
Deepest order books on headline markets.
Best for market variety
Interactive Brokers Forecast Contracts
Wider catalogue of available event contracts.
Final take
Should you choose Interactive Brokers Forecast Contracts or Underdog Fantasy?
Underdog Fantasy comes out narrowly ahead in our methodology, but both platforms have a clear lane. Choose Interactive Brokers Forecast Contracts for existing ibkr clients, and Underdog Fantasy for sports pick-em fans.