ForecastEx (Interactive Brokers) Review 2026: Fees, Markets & Features

Trading on ForecastEx

ForecastEx is Interactive Brokers' prediction market exchange - a CFTC-regulated designated contract market (DCM) and derivatives clearing organization (DCO) operated by IBKR, not by CME Group. Access comes through the ForecastTrader interface, available on web, mobile, Trader Workstation (TWS), and via API. That last point matters: ForecastEx is the only prediction market platform that offers programmatic trading through a professional-grade API.

Contracts cover politics, economics, climate, and other events, settling at $1 or $0. The trading mechanics are standard binary options: buy Yes or No contracts, and the prices for a pair sum to approximately $1.01 (the extra cent is the exchange's fee).

Fee Structure Deep Dive

ForecastEx embeds its fee directly into the spread. Yes and No contracts for the same event sum to $1.01 instead of $1.00, meaning the exchange takes $0.01 per contract pair. IBKR charges zero commission on top of this. On a round-trip basis, you effectively pay $0.01 on the opening trade (built into the spread) and nothing additional on the close or settlement.

Fee Worked Examples

At a $0.20 contract: you buy Yes at $0.205 (half the $0.01 spread embedded on each side). If the event occurs, you receive $1.00. Net profit: $0.795. Round-trip cost: $0.01. That $0.01 is 1.3% of the $0.795 payout - negligible. Use our fee calculator to compare this against other platforms.

At a $0.50 contract: you buy Yes at $0.505. Settlement at $1.00 yields $0.495 profit. Round-trip cost: $0.01, or 2.0% of profit. Still the cheapest round-trip available on any US exchange.

At a $0.80 contract: you buy Yes at $0.805. Profit on settlement: $0.195. Round-trip cost: $0.01, which is 5.1% of the $0.195 profit. Even on high-probability contracts where profit margins are thin, the flat $0.01 fee remains manageable. Compare this to Kalshi, where a taker fee of ceil(0.07 * 0.80 * 0.20 * 100) / 100 = $0.02 applies per side - $0.04 round-trip at the same price point.

The caveat is that the built-in spread means you cannot trade at the true midpoint. The $0.005 embedded on each side is small but measurable, particularly on high-frequency strategies.

Market Coverage

ForecastEx covers politics, economics, and climate - a narrower catalog than Kalshi, which lists hundreds of contracts across sports, entertainment, weather, and financials. ForecastEx does not offer sports contracts or the viral novelty markets that drive volume on other platforms.

Where ForecastEx has depth is in macroeconomic contracts: Fed rate decisions, CPI prints, GDP outcomes, and employment data. These contracts attract traders with quantitative macro backgrounds who are already using IBKR for rates and FX trading. Climate contracts - temperature records, hurricane landfalls - occupy a smaller but growing niche.

The smaller catalog is a double-edged outcome. Fewer markets means less noise, but it also means fewer opportunities to diversify event risk or find mispricings across a broad menu. If you are looking for deep contract variety, Kalshi or Polymarket offer substantially more. If you are focused on macro and political events with professional execution tools, ForecastEx covers the core categories. See how ForecastEx compares directly in our ForecastEx vs Kalshi analysis.

Tax Treatment

ForecastEx contracts are reported through IBKR's standard tax infrastructure. You will receive a 1099 form covering your prediction market activity alongside any other IBKR trading. Gains and losses are reported as part of your brokerage account activity, which simplifies record-keeping compared to platforms where you must manually track every contract.

The specific tax classification of event contract gains - whether they are treated as ordinary income, short-term capital gains, or Section 1256 contracts - remains an evolving area. Consult a tax professional familiar with derivatives. The practical advantage is that IBKR handles the reporting mechanics, so you are not reconstructing a tax basis from CSV exports.

Onboarding and Funding

Getting onto ForecastEx requires an Interactive Brokers account. This is institutional-grade onboarding: identity verification, financial suitability questionnaires, and agreement to IBKR's margin and trading policies. Expect the process to take 1-3 business days for approval, longer if additional documentation is requested.

Once approved, funding is handled through IBKR's standard deposit methods - ACH transfers, wire transfers, or transfers from other IBKR accounts. There is no separate funding step for prediction markets; your ForecastEx buying power draws from the same account balance you use for equities, options, futures, and forex.

The upside of this friction: an IBKR account unlocks far more than prediction markets. You get access to global equities, options chains, futures, forex, bonds, and mutual funds through a single account. For traders who are building a multi-asset workflow, ForecastEx is an incremental addition rather than a standalone product.

Who ForecastEx Is Best For

ForecastEx is built for traders who want institutional infrastructure: API access, professional order types, and integration with a brokerage that supports equities, options, futures, and forex in the same account. If you already have an IBKR account, adding ForecastEx contracts to your workflow is trivial.

Systematic and Algorithmic Traders

The TWS API lets you programmatically read order books, submit limit orders, and manage positions in prediction markets using the same codebase you might use for equities or futures. No other US prediction market offers this capability at a comparable fee. If you are building models that generate signals on event contracts, ForecastEx is the only platform where you can automate execution end-to-end.

Cost-Sensitive High-Volume Traders

At $0.01 round-trip, a trader executing 1,000 contracts pays $10 in total fees. The same volume on Kalshi could cost $20-$40 depending on the price distribution and maker/taker split. Run your expected volume through our fee calculator to model the difference. Over thousands of trades, the fee differential compounds into material P&L impact.

Existing IBKR Clients

If you already trade through Interactive Brokers, ForecastEx requires no new account, no new funding source, and no new login. You are adding a contract type to an existing workflow. The marginal cost of trying prediction markets through ForecastEx is effectively zero.

The IBKR Barrier

The catch is that you need an Interactive Brokers account. IBKR's account opening process involves identity verification, financial suitability questionnaires, and a learning curve on the platform itself. For casual traders who want to bet on one election, this is overkill.

But for serious traders who will execute hundreds or thousands of contracts, the combination of lowest fees, API access, and integration with a full-service brokerage makes ForecastEx the most cost-efficient platform available. The barrier to entry filters out casual participants - which, depending on your strategy, may actually improve the quality of the counterparties you trade against.