Home › Polymarket vs Underdog Predict
Facts checked September 24, 2026 against each platform's own pages, filings and news reports · numbered sources below
Underdog's prediction markets are sold through UDM, LLC (Underdog Predict), a CFTC-registered futures commission merchant, and listed on designated contract markets including Underdog's own exchange UDX, Kalshi and Crypto.com's exchange [1][2]. Users must be 18 or older, US residents and in a state where Underdog Predict operates, and the account is funded only from their Underdog Fantasy account [2][3]. IG Group agreed on July 30, 2026 to buy Underdog for up to about $1.3 billion [4]. Polymarket serves US residents through its own CFTC-regulated exchange, Polymarket US [5].
| Polymarket | Underdog Predict | |
|---|---|---|
| Who runs it | Two products: the international Polymarket.com, and Polymarket US, operated by QCX LLC [6][7] | UDM, LLC d/b/a Underdog Predict, a CFTC-registered futures commission merchant and NFA member, separate from Underdog Fantasy and Underdog Sportsbook [1] |
| Regulation | Polymarket.com says it is not regulated by the CFTC; Polymarket US is a CFTC designated contract market and clearing organization [6][5] | Contracts listed on CFTC designated contract markets: UDX (Aristotle Exchange, bought by Underdog in March 2026, live since July 18, 2026), Kalshi and Crypto.com | Derivatives North America [2][19][20][21] |
| Who can use it | Polymarket.com is blocked in 39 countries, including the US, UK, France and Germany; US residents use the separate Polymarket US app (18+, identity check) [8][9][7] | US residents 18 and older who are in a state where Underdog Predict operates; identity check with name, address, date of birth and SSN [2][3][22] |
| Money | Polymarket.com: pUSD, a token backed 1:1 by USDC on Polygon; Polymarket US: US dollars [10][5] | Funded only from the customer's linked Underdog Fantasy account, and withdrawals go back through it [3] |
| Trading fees | Polymarket.com: takers pay shares x rate x p x (1-p), with a rate from 0 (geopolitics) to 0.07 (crypto); Polymarket US: takers pay 0.0695 x contracts x p x (1-p) and makers get a rebate [11][12] | UDM commission of $0.01 per contract per side plus exchange fees; on UDX since September 11, 2026 takers pay 0.07 x contracts x P x (1-P) and makers 0.0175 x contracts x P x (1-P) [23][24] |
| Deposits and withdrawals | Polymarket.com: crypto deposits from several chains, no Polymarket fee; Polymarket US: card or ACH up to $50,000 a day, wire from $1,000, free withdrawals [13][11][14][15] | Only through the linked Underdog Fantasy account [3] |
| Limits | Polymarket US sets no trading size limits [16] | Every position must be fully collateralized in advance [3] |
| Markets | Politics, sports, crypto, economics, culture, weather, tech and more [5][11] | Sports event contracts and 'Parlay' trades that combine several events [2] |
| How markets settle | Polymarket.com: UMA optimistic oracle with a 2-hour challenge window and a UMA vote on disputes; Polymarket US: the exchange applies each market's listed sources [17][18] | Cash-settled on the outcome under the rules of the listing exchange and its clearinghouse [3] |
All current prices: Polymarket odds today · fees on a real order: Polymarket fee calculator · where Polymarket is available
Underdog says you must be present in a state where Underdog Predict operates; IG Group said in July 2026 that Underdog had expanded across 30 states with parlays. Check the app for your state. [2][4]
Designated contract markets including UDX, Underdog's own exchange (Aristotle Exchange, bought in March 2026 and live since July 18, 2026), Kalshi and Crypto.com | Derivatives North America, whose sports contracts came to the Underdog app in September 2025. [2][20][21][25]
Underdog Predict charges a $0.01 commission per contract per side plus exchange fees; on UDX, takers pay 0.07 x contracts x P x (1-P). Polymarket US charges takers 0.0695 x contracts x p x (1-p) and pays makers a rebate. [23][24][12]
IG Group agreed on July 30, 2026 to acquire Underdog Sports Holdings for up to about $1.3 billion, with completion expected in late 2026 or early 2027. [4]
More comparisons: Polymarket vs Kalshi (live odds) · Polymarket vs PredictIt · Polymarket vs Manifold · Polymarket vs Robinhood · Polymarket vs DraftKings Predictions · Polymarket vs Crypto.com · Polymarket vs ForecastEx (Interactive Brokers) · Polymarket vs Betfair Exchange · Polymarket vs Novig · Polymarket vs Limitless · Polymarket vs Myriad · Polymarket vs FanDuel Predicts · Polymarket vs Coinbase · Polymarket vs PrizePicks · Polymarket vs Fanatics Markets. Polymarket View is independent and not affiliated with Polymarket, Underdog Predict or any exchange. Rules, fees and availability change; check each platform before you sign up. Educational information, not financial advice.