By PredictQ Team // Updated: August 2026
Underdog Predict lives inside the Underdog Fantasy app, one tab over from the pick’em contests and best ball drafts that built one of the biggest DFS audiences in the country. That placement is the entire strategy: give a few million fantasy players event contracts without asking them to download anything.
The plumbing underneath: Underdog now runs its own CFTC-licensed exchange, live since July 2026. The March 2026 acquisition of Aristotle Exchange, the licensed exchange and clearinghouse behind PredictIt, gave it the full stack, and today Underdog is one of the few operators holding all three major CFTC licenses: exchange (DCM), clearinghouse (DCO), and brokerage (FCM). Your orders land on Underdog’s own venue.
Kalshi is the other side of this matchup: the CFTC-designated exchange with the deepest books in US prediction markets and a catalog that runs from Fed meetings to hurricane counts.
Quick Verdict
Kalshi, unless you’re already an Underdog regular. The state math alone settles it: Underdog Predict operates in 31 states plus DC, and the missing list includes New York, New Jersey, Illinois, Pennsylvania, Ohio, and Michigan, a huge share of the US trading population. Add a sports-only catalog and no dedicated welcome bonus, and Underdog Predict is an add-on for existing Underdog users rather than a standalone destination. Kalshi is a destination.
Snapshot
Structure: Kalshi runs its own CFTC-regulated exchange and clearinghouse. Underdog now does too: its own exchange went live in July 2026 on the Aristotle infrastructure, backed by a full DCM, DCO, and FCM license stack.
Welcome bonus: Kalshi, trade $10 and get $10. Underdog Predict has no Predict-specific bonus; the fantasy side offers Play $5, Get $50 in bonus entries, usable on DFS only.
States: Kalshi is nationwide federally, sports blocked in Michigan and contested in New York. Underdog Predict covers 31 states plus DC, including California, Texas, and Florida, but excluding most of the Northeast and Midwest betting strongholds.
Markets: Kalshi runs politics, sports, economics, crypto, weather, climate, culture. Underdog Predict is sports-first, with some politics, culture, and economics sprinkled in.
Fees: Kalshi’s probability-weighted formula peaks at $1.75 per 100 contracts at 50 cents, near zero at extremes, with maker discounts. Underdog charges per-contract fees comparable to other broker-tier platforms.
App: Kalshi is a dedicated trading platform on web and mobile. Underdog Predict is a section of the fantasy app, same login, same wallet.
How They’re Different
Coverage is the widest gap. Underdog’s catalog assumes you’re there for sports: game outcomes, futures, player markets in the major leagues. Kalshi treats sports as one deep category among many. If a CPI print, a cabinet appointment, or an Atlantic hurricane count sounds like a market you’d trade, only one of these platforms lists it.
Within sports, Kalshi typically carries deeper liquidity and tighter spreads on the big markets. Underdog’s books are respectable in the majors and thinner everywhere else. Thin books cut both ways: worse execution if you need to exit, occasional soft prices if you’re the sharpest person watching an obscure market.
The DFS integration is genuinely good for its target user. Same app, same account, same balance as your pick’em entries. An Underdog regular can take a position on a game future in fifteen seconds without onboarding anywhere. Friction is the silent killer of multi-platform trading, and Underdog removed all of it for its own base.
For everyone else, that integration is worth nothing. And the bonus situation makes the standalone case weaker: the Play $5, Get $50 offer everyone advertises is bonus entries for fantasy contests. None of it spends on Predict contracts. Kalshi’s smaller $10 bonus is at least denominated in the thing you came to do.
The Aristotle bet already paid off. Underdog’s own exchange went live in July 2026, completing Kalshi-style vertical integration, and the momentum since has been real: IG Group agreed in late July to acquire Underdog for up to $1.3 billion with a stated focus on building the best prediction market for sports fans, and in August Underdog hired Noah Zingler-Sternig, Kalshi’s former Head of Operations, to help build the best exchange for sports fans. In our own conversations with the team, they’ve been direct that they want to build for true prediction market principles. PredictIt’s political-markets DNA still hints at where the catalog could expand.
When to Pick Kalshi
You want markets beyond sports: politics, econ, weather, culture.
You live in New York, New Jersey, Illinois, Pennsylvania, Ohio, Michigan, or another state on Underdog’s excluded list.
You want a welcome bonus that actually applies to prediction markets.
You use limit orders and care about maker-fee discounts.
You want the deepest sports books, not the most convenient ones.
Kalshi bonus code: trade $10, get $10
When to Pick Underdog Predict
You’re already an active Underdog Fantasy user and want event contracts one tab away.
You want a single wallet across DFS and prediction markets.
You trade sports exclusively and value convenience over depth.
You’re in one of the 31 covered states, including CA, TX, and FL where sportsbooks can’t operate.
You like the Underdog product culture and want to be there as its new exchange and the IG-backed catalog expansion ramp up.
Underdog Predict bonus code: play $5, get $50
Both?
For Underdog regulars, running both is the obvious play: keep the fantasy action where it lives and claim Kalshi’s bonus for everything the fantasy app can’t do. There’s no real tradeoff since the accounts serve different jobs.
Bottom Line
Underdog Predict is no longer just a feature. It’s a real exchange now, with IG Group money behind it and a team building specifically for sports fans, and if you’re already in that app, use it. But a sports-first catalog in 31 states with no trading bonus still complements a full multi-category exchange rather than replacing it.
Kalshi is the everything exchange. Underdog is the sports fan’s exchange. Set them up in that order. Sign up for Kalshi AND Sign up for Underdog Predict.
Disclosures: PredictQ may receive compensation when readers sign up for platforms through links on this page. Information accurate as of August 2026. Kalshi operates a CFTC-regulated Designated Contract Market and clearinghouse; its sports contracts are blocked or contested in several states. Underdog Predict is operated by Underdog, which holds CFTC-registered exchange (DCM), clearinghouse (DCO), and brokerage (FCM) licenses, with trades executing on Underdog’s own CFTC-regulated exchange. State availability changes frequently; confirm eligibility in-app. Trading event contracts involves significant risk. This content is for informational purposes only. Must be 18 or older. If you or someone you know has a gambling problem, call 1-800-GAMBLER.