Underdog Prediction Market Review (2026)

What Is Underdog Prediction Markets?

Underdog Prediction Markets lets users buy and sell event contracts based on real-world outcomes. The product is called Prediction Picks inside the Underdog app and currently focuses heavily on sports, with markets covering outcomes such as game winners, spreads, totals, futures and selected player results.

Each contract has a price based on the market-implied probability of the outcome. If a contract costs $0.65, that represents roughly a 65% implied probability. If your prediction is correct, the contract settles at $1. If it is incorrect, it settles at $0. Exchange fees can also apply on top of the contract price.

The important distinction is that Prediction Picks are not the same as Underdog Fantasy or Pick'em. They are financial event contracts traded through CFTC-regulated exchanges. Underdog now owns its own regulated exchange, known as Underdog Exchange or UDX, but Prediction Picks can also be powered by other exchanges including Kalshi and Nadex.

Underdog handles much of that complexity behind the scenes. Users see the available market inside the Underdog app rather than having to choose between exchanges themselves. However, the exchange powering a particular market still matters because settlement rules, fees and other details can differ depending on where the contract is traded.

Prediction Picks are also different from traditional sportsbook bets. Instead of accepting fixed American odds from a sportsbook, you are buying an event contract whose market value can change as the probability of the outcome changes. Eligible positions can usually be cashed out before settlement, subject to market liquidity, meaning your entry price and exit price can matter as well as whether the final prediction is correct.

That combination is what makes Underdog unusual. It takes prediction-market contracts and presents them through a sports-focused app that many users may already recognize from fantasy sports, while much of the exchange infrastructure operates in the background.

How We Reviewed Underdog Prediction Markets

This review focuses specifically on Underdog Prediction Picks, the event-contract product available through the Underdog app, rather than Underdog's traditional Pick'em or fantasy contests.
That distinction matters. Prediction Picks are financial event contracts traded through regulated exchanges, while Underdog's fantasy products operate under a different structure and use different rules.
We reviewed Underdog from the perspective of a US user deciding whether its prediction-market product is worth using, including how the experience compares with standalone platforms such as Kalshi and Polymarket.

Review Criteria

• Legal structure: We checked Underdog's CFTC-regulated exchange and clearing structure, as well as the role of Kalshi and Nadex in powering some Prediction Picks.
• Fees: We looked at the exchange fees users can pay on Prediction Picks and how those costs affect the potential return.
• Markets: We reviewed the sports, futures and other event contracts currently available through Underdog.
• Liquidity and cash out: We considered whether positions can be entered and exited easily, including situations where insufficient liquidity can make a market or Cash Out unavailable.
• Ease of use: We looked at account setup, contract pricing, payments, settlement and how well Underdog simplifies prediction-market trading for sports-focused users.
• Alternatives: We compared Underdog with Kalshi, Polymarket and other regulated US prediction-market products.

Prediction-market rules, fees and availability can change quickly. Treat this review as an editorial assessment of Underdog's current Prediction Picks product and always check the applicable market rules before trading.

Is Underdog Prediction Markets Legal in the US?

Underdog Prediction Markets operates through a federally regulated US derivatives structure, but that does not mean every Prediction Pick is automatically available in every state.

Underdog uses several regulated entities. UDM, LLC, doing business as Underdog Predict, is a CFTC-registered Futures Commission Merchant. Underdog also owns Aristotle Exchange DCM, which operates as Underdog Exchange (UDX) and is designated by the CFTC as a contract market. Its affiliated Underdog Clearinghouse is separately registered as a derivatives clearing organization.
Prediction Picks can also be routed through other CFTC-regulated exchanges, including Kalshi and Crypto.com Derivatives North America, depending on the market shown in the Underdog app.

This gives Underdog a formal federal regulatory structure for offering event contracts in the United States.
However, federal regulation does not eliminate the ongoing dispute between prediction-market operators and state gaming regulators.
Sports event contracts in particular have become a legal battleground. Some states argue that contracts based on sporting events amount to sports wagering and therefore require state gaming licenses. Prediction-market companies have generally argued that these contracts fall under federal commodities law and CFTC oversight.

Underdog itself is now involved in that dispute. In September 2026, Underdog Predict challenged enforcement action from Connecticut after state regulators ordered several prediction-market operators to stop offering certain event contracts.
For users, the practical takeaway is simpler: availability depends on your physical location and the markets Underdog is permitted to show you at that time. Prediction Picks are currently offered in 46 states plus Washington, DC, but individual markets and state availability can change.

For more background on how this regulatory model works, see our guide to prediction markets in the U.S..

Important: This page is an editorial review, not legal advice. Prediction-market regulation remains a rapidly developing area of US law.

Underdog Prediction Markets vs Underdog Fantasy: The Difference Matters

One of the easiest mistakes to make with Underdog is assuming Prediction Picks and Underdog Fantasy are essentially the same product. They are not.

Underdog Fantasy includes products such as Pick’em and season-long fantasy contests. Pick’em typically asks users to predict whether player statistics will finish Higher or Lower than a listed number, with payouts determined by the type of entry and multiplier.
Underdog Prediction Picks are different.

They are financial event contracts traded through CFTC-regulated exchanges. Instead of choosing Higher or Lower and receiving a fantasy multiplier, users buy contracts tied to real-world outcomes such as which team will win, whether a team covers a spread, how a total settles or which team wins a championship.
The pricing works differently too.

A Prediction Pick priced at $0.65 represents roughly a 65% market-implied probability. If the contract settles in your favor, it pays $1. If it resolves against you, it pays $0. Exchange fees may also apply.

Prediction Picks can also change in value after you enter. Eligible positions may be cashed out before the market settles, subject to liquidity. That makes the entry price and potential exit price relevant in a way that does not apply to a standard fantasy Pick’em entry.
The two products even have different state availability. Prediction Picks are currently available in 46 states plus Washington, DC, including several states where Underdog's traditional fantasy contests are unavailable.

Underdog has started bringing the two experiences closer together through Combo Entries, which can include both Prediction Picks and Fantasy picks in the same entry. However, each component still follows the rules that apply to its respective product.
For users, the main point is simple: Prediction Picks may look familiar inside the Underdog app, but they are prediction-market contracts, not fantasy entries.

Underdog Prediction Market Fees: What You Actually Pay

Underdog Prediction Picks can include an exchange fee in addition to the contract price.
The important point is that Underdog should not be described as simply charging a flat fee on every contract. Prediction Picks can be powered by different regulated exchanges, including Underdog Exchange (UDX), Kalshi and Nadex, so the applicable fees can depend on the market and exchange behind your position.

Underdog provides the following example to explain how fees affect a trade:

• Buy 5 contracts at $0.70 each: $3.50
• Exchange fee: $0.02 per contract
• Total fees: $0.10
• Total cost: $3.60

If all five contracts settle at $1, the payout is $5 and the net profit is $1.40.
If the prediction is incorrect, the contracts settle at $0 and the full $3.60 paid, including the exchange fees, is lost.
The $0.02 fee in this example should not be treated as a guaranteed flat fee for every Prediction Pick. Underdog labels the example as illustrative, while its broader documentation states that additional exchange fees may apply.

What to Know About Underdog Prediction Market Fees

• Fees can apply on top of the contract price: Your actual cost can therefore be slightly higher than simply multiplying the contract price by the number of contracts.
• The underlying exchange matters: Prediction Picks can be offered through UDX, Kalshi or Nadex.
• Fees reduce your net return: A winning contract settles at $1, but your profit is the difference between the payout and your total cost, including fees.
• Losing contracts include the fee in your loss: If a contract settles at $0, the amount originally paid, including applicable fees, is not returned.
• Check each entry before confirming: The relevant contract price and costs should be considered together when deciding whether a trade offers value.

ATS view: Underdog makes the front-end experience simple, but users should not ignore the exchange operating behind a Prediction Pick. Contract price and applicable fees both determine the true cost of the trade.

Liquidity and Cash Out: You May Not Always Be Able to Exit

Liquidity matters on Underdog Prediction Markets because every trade needs another participant willing to take the other side.
If there is not enough activity in a market, you may see no available price, have a Prediction Pick fail to submit, or find that Cash Out is temporarily unavailable.

That is an important difference from a traditional sportsbook.
Underdog allows most eligible Prediction Picks to be cashed out before the event settles. When you cash out, your position is sold at the current market price. If the probability of your outcome has increased since you entered, the position may be worth more. If the market has moved against you, it may be worth less.

Cash Out is not guaranteed.
Insufficient liquidity can prevent another participant from taking over your position. Trading can also be suspended temporarily during significant moments in a live event, while liquidity often declines as an outcome becomes increasingly certain near the end of a game.

If Cash Out is unavailable, the position remains open and will settle normally when the underlying market resolves.
This means the price displayed when you enter a Prediction Pick is only part of the trading experience. Users should also consider whether there is enough liquidity to enter and potentially exit the position at a reasonable price.