Comparison · updated July 2026
Polymarket vs Interactive Brokers Forecast Contracts
Polymarket and Interactive Brokers Forecast Contracts 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.
Polymarket
The largest crypto-settled prediction market for global events.
Interactive Brokers Forecast Contracts
CFTC-regulated event contracts inside the IBKR trading platform.
Rating
Polymarket
4.3
Interactive Brokers Forecast Contracts
4.1
Best for
Polymarket
Deepest liquidity and largest market variety
Interactive Brokers Forecast Contracts
Existing IBKR clients
Regulation
Polymarket
Offshore
Interactive Brokers Forecast Contracts
CFTC-regulated
US availability
Polymarket
Restricted
Interactive Brokers Forecast Contracts
Available
Fees
Polymarket
0% trading fees
Interactive Brokers Forecast Contracts
$0.02–$0.10 per contract
Mobile
Polymarket
Good
Interactive Brokers Forecast Contracts
Good
Markets
Polymarket
Politics, Sports, Crypto, Economy, Culture, AI, Entertainment, Technology
Interactive Brokers Forecast Contracts
Economy, Financial events, Politics
Payment
Polymarket
USDC (Polygon)
Interactive Brokers Forecast Contracts
Founded
Polymarket
2020
Interactive Brokers Forecast Contracts
Verdicts
Who wins, category by category
Best for beginners
Polymarket
Cleaner onboarding and a more polished consumer experience.
Best for regulation
Interactive Brokers Forecast Contracts
Operates as a CFTC-designated contract market.
Final take
Should you choose Polymarket or Interactive Brokers Forecast Contracts?
Polymarket comes out narrowly ahead in our methodology, but both platforms have a clear lane. Choose Polymarket for deepest liquidity and largest market variety, and Interactive Brokers Forecast Contracts for existing ibkr clients.