How To Trade Prediction Markets On Interactive Brokers

Interactive Brokers just launched the first unified prediction markets platform in the United States — and almost no one is talking about how good the pricing actually is. Three of the biggest event contract venues — Kalshi, CME Group, and ForecastEx — now live inside a single Interactive Brokers account, with smart order routing automatically picking the best price across all three.

If you've been waiting for a serious, low-friction way to trade prediction markets, this is it. The fees are simple, the funding is unified with your main brokerage account, and one of the three venues is currently sitting at the cheapest event contract pricing in the US.

By the end of this article you're going to know exactly how Interactive Brokers prediction markets work, how to place your first trade, the full fee breakdown across all three venues, and the 3.14% APY feature on ForecastEx that almost every other guide is missing.

Key Takeaways

• Interactive Brokers launched the first unified US prediction markets platform, bringing Kalshi, CME Group, and ForecastEx under a single account with smart order routing for best price.
• ForecastEx is currently one of the cheapest places to trade event contracts in the US — a single 1 cent all-inclusive fee built into the market spread (yes + no bids sum to $1.01 instead of $1.00).
• ForecastEx pays 3.14% APY on cash tied up in open positions, so you earn interest while waiting for contracts to resolve.
• Kalshi trades via IBKR cost 2 cents per contract total (1 cent IBKR commission + 1 cent exchange fee); CME costs 1 cent IBKR plus pass-through exchange and regulatory fees.
• There are no settlement fees on any of the three venues — but exiting early effectively doubles your fees, so the structure rewards holding through expiration.
• Yes and no contracts are interchangeable: betting "yes" on the Packers is mathematically identical to betting "no" on the Bears.

What Are Interactive Brokers Prediction Markets?

Interactive Brokers prediction markets is a unified platform that lets you trade event contracts across three venues — Kalshi, CME Group, and ForecastEx — from a single Interactive Brokers account. Smart order routing automatically picks the best price among all three when you place a trade.

The big practical win: you don't have to position funds in a separate prediction markets wallet the way you do on some platforms. Cash already sitting in your Interactive Brokers account is immediately available for prediction markets, stocks, or anything else you trade with them. One account, one balance, three exchanges.

The initial focus of the launch is on macro markets — Fed rate decisions, political markets, upcoming elections, primaries, future presidential candidates, and climate-related contracts. Sports and cultural markets are also available, with deeper depth on certain venues than others.

The Three Venues Explained

ForecastEx

ForecastEx is Interactive Brokers' own prediction markets exchange. It's currently the cheapest of the three on a per-contract basis and is the only one paying interest on cash tied up in open positions. ForecastEx tends to be the strongest choice for macro contracts like Fed decisions and CPI data.

Kalshi

Kalshi is the big consumer-facing prediction markets platform in the US right now. Through Interactive Brokers, it's the venue with the deepest base of markets for elections, cultural predictions, and sports. If you want breadth — number of markets to choose from — Kalshi is where you'll find it.

CME Group

CME Group sits on the more institutional end of the event contracts world. The contracts are larger in notional size, which means on a per-dollar-of-exposure basis, CME can be very competitive for bigger trades despite the pass-through exchange and regulatory fees.

How To Place Your First Trade On Interactive Brokers Prediction Markets

The flow is genuinely simple once you've seen it once. Here's the full process:

1. Log into your Interactive Brokers account on desktop.
2. Click the Trade icon in the top navigation.
3. Click the IBKR Prediction Markets button.
4. You'll land on the main prediction markets page under the Markets tab. From here you can browse markets, view elections, check your portfolio, search by topic, and see your available cash for trading.
5. Click into any market that interests you — for example, "How high will Bitcoin get this year?"
6. Pick the price point or outcome you want to trade. Each option shows the current probability, open interest, and the exchange that's currently offering the best price.
7. Click Buy on either Yes or No depending on your view.
8. An order ticket opens on the right side of the screen showing the bid and ask, just like trading stocks.
9. Set your limit price and quantity. If you want to get filled immediately, buy at the ask. If you want to wait for your price, set a limit at or below the bid.
10. Pick a time-in-force: Day keeps the order live until close, Immediate or Cancel (IOC) fills what it can right now and cancels the rest.
11. Click Preview Order, review, then submit. You'll get one final confirmation before the order goes live.

One thing worth doing every single time before you submit: click Show Market Rules. There's a brief overview plus a full eight-page rules document for every market. You want to know exactly what condition has to be met for a contract to settle yes — there are no surprises if you read it.

Understanding Yes/No Contracts And Settlement

This is where prediction markets diverge from traditional sports betting, and it's the part that gives them real flexibility.

Every contract has two sides: yes and no. If you buy a yes contract at 39 cents and the event happens, that contract settles at $1.00. If the event doesn't happen by the deadline, it settles at $0.00. The price between now and expiration moves based on the perceived probability of the outcome — exactly like a stock, except the floor and ceiling are fixed.

What you see is what you get on pricing. There's no options-style multiplier. If you want to buy one contract at 38 cents, it costs you 38 cents plus fees. One hundred contracts at 38 cents costs you $38 plus fees. That's it.

The other big difference from traditional betting: you can exit early. Unlike a sportsbook where you place a bet and then ride it to the final whistle, prediction markets let you close your position at any time before settlement — just like selling a stock. If the probability moves in your favor, you can lock in gains. If it moves against you, you can cut the loss without waiting for the event to resolve.

Yes and no are also interchangeable in the same market. If you wanted the Packers to beat the Bears, you could buy Packers Yes — or you could buy Bears No. Same trade, expressed two different ways. That's worth knowing because sometimes one side will be priced more favorably than the other.

The 3.14% APY Feature On ForecastEx

Here's the part most write-ups skip entirely. ForecastEx currently pays 3.14% APY on cash tied up in open positions. That means if you've got $1,000 worth of contracts sitting open waiting to resolve, that capital is earning interest the entire time it's working.

Functionally, you're getting paid to wait for your trade to settle. Combined with already being the cheapest of the three venues, that interest payment makes ForecastEx genuinely hard to beat for macro contracts you plan to hold through expiration.

Full Fee Breakdown Across All Three Venues

The good news up front: there are no settlement fees on any of the three venues. If you hold a contract to expiration, you don't pay anything extra to let it settle. The fee structure beyond that is straightforward.

ForecastEx is interesting because the fee isn't charged on top of your order — it's baked into the market itself. The combined yes and no bids always sum to $1.01 instead of $1.00, and that extra penny is the exchange fee at execution. You don't see a separate line item for it.

CME contracts are larger in notional size, which matters for size traders. On a per-dollar-of-exposure basis, the CME pricing can come out very competitive for larger trades, even with the pass-through fees factored in.

The Hidden Cost: Exiting Early

Here's the catch the fee structure quietly enforces. If you enter a contract and exit before settlement, you pay fees on both sides — entry and exit. That effectively doubles your total fees versus holding to expiration.

Quick example from the platform. Entering at 39 cents on a Kalshi market and the trade is filled — the average cost basis immediately shows as 41 cents because of the 2 cents in entry fees. If you exit that position at 48 cents, you pay another 2 cents in exit fees, so you're effectively getting out at 46 cents. On 100 contracts, that's roughly $5 in profit instead of $9.

You can absolutely still trade in and out of contracts actively — it's a legitimate strategy. But the structure clearly rewards holding through settlement, especially on ForecastEx where you're also earning the 3.14% APY for the duration.

Which Venue Is Best For What

The smart order routing handles best execution automatically, but understanding which venue tends to be strongest for which type of contract helps you know where the depth and best fills usually live.

• Macro contracts (Fed decisions, CPI data, big economic data releases): ForecastEx and CME tend to be the best choices. ForecastEx for cheaper fees on smaller trades, CME for larger size.
• Elections and cultural predictions: Kalshi shines here with by far the deepest base of available markets.
• Sports: Kalshi is currently the strongest of the three for sports event contracts.

None of this is a strict rule — the smart order routing will pick the best price wherever it's currently sitting — but knowing which venue tends to attract the most depth for a given category helps you set expectations for fills.

Frequently Asked Questions

What are Interactive Brokers prediction markets?

Interactive Brokers prediction markets is a unified event contracts platform that combines three exchanges — Kalshi, CME Group, and ForecastEx — under a single Interactive Brokers account. Smart order routing automatically picks the best available price across all three venues when you place a trade.

What is ForecastEx?

ForecastEx is Interactive Brokers' own prediction markets exchange. It's currently one of the cheapest places to trade event contracts in the US, with an all-inclusive 1 cent per contract fee built into the market spread, and it pays 3.14% APY on cash tied up in open positions.

How much does it cost to trade prediction markets on Interactive Brokers?

ForecastEx costs 1 cent per contract (built into the market spread). Kalshi via IBKR costs 2 cents per contract total — 1 cent IBKR commission plus 1 cent exchange fee. CME Group costs 1 cent IBKR commission plus pass-through exchange and regulatory fees. There are no settlement fees on any venue.

Do I need a separate account to trade prediction markets on Interactive Brokers?

No. Funds in your main Interactive Brokers account are immediately available for prediction markets trading. There's no separate prediction markets wallet to fund or manage.

Can I exit a prediction market position early?

Yes. Unlike traditional sports betting, prediction market contracts can be sold at any time before settlement — just like a stock. The price moves based on the perceived probability of the outcome, and you can close all or part of your position whenever you want.

What happens when a prediction market contract settles?

If the contract outcome happens, a yes contract settles at $1.00 and a no contract settles at $0.00. If the outcome doesn't happen by the deadline, the yes settles at $0.00 and the no settles at $1.00. Your profit or loss is the difference between your entry price and the settlement value, minus fees.

How does the 3.14% APY on ForecastEx work?

ForecastEx pays 3.14% APY on cash tied up in open positions on its exchange. As long as your contract is open and waiting to resolve, that capital earns interest. It effectively pays you to wait for your trade to settle.

Are there settlement fees on Interactive Brokers prediction markets?

No. None of the three venues — ForecastEx, Kalshi, or CME Group — charge a settlement fee. If you hold a contract through to expiration, you don't pay anything extra to let it settle. Exiting early, however, means paying fees on both your entry and exit.

Final Thoughts

This launch is genuinely one of the more underrated trader-focused releases of the year. Prediction markets are growing fast — in the US and globally — and Interactive Brokers consolidating Kalshi, CME, and ForecastEx into a single account with smart order routing is a serious upgrade for anyone who wants real access to event contracts without juggling multiple platforms.

The fee structure is simple, the funding is unified with your main brokerage account, and ForecastEx is currently sitting at some of the cheapest event contract pricing in the country — with 3.14% APY on top of that while you wait. If you trade macro, the structure rewards holding through settlement. If you trade elections, sports, or cultural markets, Kalshi's depth via the same account is a real advantage.

If you want to start trading prediction markets across Kalshi, CME, and ForecastEx from a single account, check out IBKR. It's the platform I use to access all three venues with smart order routing for best execution.