Kalshi vs. Polymarket: Which Prediction Market Fits You in 2026?

Kalshi and Polymarket are both CFTC-regulated prediction markets now, and the right one depends on how you trade: Kalshi brings the deeper sports menu, seven funding methods, and real responsible-trading tools, while Polymarket US answers with lower taker fees, rebates that pay you for resting limit orders, and the strongest politics and world-events board. That single sentence would have been impossible to write a year ago, when Polymarket was still locked out of the United States.

Everything changed in stages: Polymarket bought the CFTC-licensed exchange QCEX in July 2025, relaunched for US traders in December, dropped its waitlist in May 2026, and switched on a brand-new fee schedule on July 1, 2026. Kalshi updated its own schedule six days later. Most comparisons you will find were written before any of that happened. This one is built from the current schedules, the CFTC filings, and our own price archive, and we re-verify it on a set cadence.

Kalshi vs. Polymarket at a Glance

The one-table version: both venues are federally regulated USD exchanges, the fee gap is real but small, and the differences that actually steer the decision are funding methods, market mix, maker treatment, and consumer-protection tools.

How Are Kalshi and Polymarket Regulated?

Both platforms run designated contract markets overseen by the Commodity Futures Trading Commission, the same federal regulator that supervises futures exchanges. The difference is how each one got there, and what the states are doing about it.

Kalshi is the incumbent. It became the first exchange built for event contracts to win CFTC designation in November 2020, launched in 2021, sued its own regulator to force election markets live in 2024, and added single-game sports contracts in January 2025. That sports expansion triggered the defining fight of its corporate life: state gaming regulators argue sports event contracts are unlicensed sports betting, and the resulting lawsuits have split the courts.

Polymarket took the long way home. It grew up as a crypto prediction market, paid a $1.4 million CFTC settlement in 2022 and blocked US users, then processed billions in volume on the 2024 election from abroad while the FBI raided its founder’s apartment. No charges followed, the investigations closed in July 2025, and days later Polymarket bought QCEX, a licensed exchange and clearinghouse, for $112 million to re-enter the US legally. The regulated Polymarket US exchange launched that December.

Where the state fights stand

The honest answer on state availability is that it moves monthly. Federal appeals courts have backed Kalshi in New Jersey, holding that sports event contracts likely fall under exclusive CFTC jurisdiction, while judges in New York, Nevada, Massachusetts, and Washington have gone the other way, and the CFTC itself is suing several states to settle the question. Polymarket US faces its own patchwork of state blocks. Neither app will let you trade a restricted market from a restricted state, so the eligibility screen inside each app is the practical authority. For the current map, this maintained state-by-state legality tracker is the best single reference, and our prediction markets and event contracts hub covers the bigger regulatory picture.

What Do They Cost to Trade?

Nearly the same formula with different coefficients: Kalshi charges takers 0.07 times the contract’s price uncertainty, Polymarket US charges 0.06, and only Polymarket pays you to be a maker. Both fee schedules are brand new as of July 2026, which is exactly why most older comparisons are wrong about this section: Polymarket’s fee-free era is over.

Here is how the math works on both venues. Fees scale with how uncertain the contract is, peaking at 50-cent coin flips and shrinking toward longshots and near-locks. Kalshi rounds each fee up to the next cent; Polymarket uses banker’s rounding, which on tiny trades can round to zero. Kalshi’s published range on standard markets runs from $0.07 to $1.75 per 100 contracts, with different multipliers on some series and a handful of fee-free markets. Polymarket US caps out at $1.50 per 100 and layers volume-based taker rebates on top from $250,000 in monthly volume.

The interactive calculator below runs both published formulas on any trade you type in. Source schedules: Kalshi’s published fee schedule and the Polymarket US fee schedule.

Funding and Withdrawals

Kalshi wins on breadth of funding options; Polymarket US keeps it simple and free. Both are US-dollar platforms with full KYC, so neither requires crypto.

• Kalshi: ACH bank transfer, debit card (including Apple Pay and Google Pay), PayPal, Venmo, Cash App for deposits, crypto via Zero Hash, and wire. Minimum deposit is $10, or $1,000 by wire. ACH is free; debit-card deposits carry a 2% processing fee. Withdrawals run from near-instant on debit to a few business days on ACH.
• Polymarket US: ACH, debit card, Apple Pay, and wire, with no platform-charged deposit or withdrawal fees and no published minimum. Deposits can credit instant buying power while they clear; withdrawals go back to bank or debit.

Speed: how fast money moves

Kalshi’s fastest lanes are debit, PayPal, and Venmo withdrawals, which normally land within about half an hour, while ACH runs three to four business days each way. Polymarket US credits instant buying power on many deposits while the transfer clears, then returns withdrawals to your bank or debit card once funds have settled. Neither platform holds withdrawals for manual review as a matter of course, but both apply security holds to fresh deposits before they can leave, so plan your first withdrawal a few days after your first deposit on either venue.

Which Has More Markets?

Kalshi has the deeper sports book; Polymarket has the stronger politics and world-events board; both cover economics, culture, crypto prices, and weather. Reported figures put sports at more than 90% of Kalshi’s trading activity in 2025, and its fee schedule alone lists over 140 active series. Polymarket built its reputation on elections and global news, and that heritage still shows in its market depth.

Scale is no longer a differentiator: NBC News reported more than $197 million traded across 1,408 open 2026 midterm markets on the two platforms combined by July 2026. What settles your trade differs from the crypto era, too. On both US exchanges, outcomes resolve under CFTC-filed rulebooks rather than a blockchain oracle. If the mechanics of settlement are new to you, our guide to how event-contract settlement works walks through it step by step.

How settlement and early exits work

Every contract on both venues resolves to exactly $1.00 if the outcome happens and $0.00 if it does not, with the settlement source named in each market’s rules before you trade. Kalshi settles against the authority written into its rulebook for that series, whether that is a league’s official result, a government data release, or a named publication. Polymarket US works the same way on its own CFTC-filed rulebook, which is a real break from the international platform’s crypto-oracle system that older guides still describe.

The part sportsbook bettors underrate: you do not have to wait for settlement. Both are exchanges, so you can sell a winning position early to lock in gains, or cut a losing one to salvage part of your stake, any time there is a bid. That exit option is the structural advantage over a betting slip, and it is why fee schedules charge per trade rather than taking a cut of winnings.

Liquidity and Pricing: What Our Data Shows

On marquee futures, the two venues price within about a point of each other, and both usually sit a few points above the vig-removed sportsbook consensus. That is not a talking point; it comes from our own archive, which has logged sportsbook and prediction-market prices side by side, every day, since June 2026.

Two things stand out in that table. First, Kalshi and Polymarket rarely disagree by more than a point on liquid futures, which tells you both order books are pricing from the same information. Second, the sportsbook consensus runs lower on favorites because books price in their margin. For the full gap-ranked view across every market we track, see our Divergence Board.

Reading depth before you trade

Headline liquidity only describes the marquee markets. On both venues, depth falls away fast once you leave championship futures, elections, and the biggest games, and the practical tell is the spread: a one-cent gap between the yes bid and ask means you can enter and exit cheaply, while a five-cent gap on a quiet market can cost you more than the trading fee ever will. Check the order book before sizing a position on either platform, and treat a wide, thin book as its own warning regardless of which venue is quoting it.

How Do Prediction Markets Compare to Sportsbooks?

A prediction market is an exchange: you trade against other people at prices the crowd sets, pay a formula fee, and can exit your position before the event settles. A sportsbook quotes you its own line with the margin built in and holds your bet to the finish. Neither model is automatically better; they reward different habits.

The practical differences: exchanges let you sell out early and see the whole order book, but liquidity thins out fast beyond the marquee markets, and there is no parlay product. Books give you deep menus, promos, and instant bet placement at the cost of built-in margin. If you are weighing the two models seriously, start with our walkthrough on how to trade event contracts, and for the consumer-protection angle, we compared whether prediction markets are safer than sportsbooks in a dedicated piece.

Taxes and Reporting

Tax treatment is the least settled part of this comparison, so treat this section as a map of the open questions rather than advice. Profits on both platforms are taxable income regardless of whether a form shows up.

• Forms: Kalshi is the better documented of the two; it issues 1099-series forms for qualifying activity. Polymarket US’s form policy is less publicly documented, so keep your own records either way. Both platforms let you export trade history.
• Classification: many tax professionals discuss treating CFTC-regulated event contracts under Section 1256, which splits gains 60/40 between long-term and short-term rates. The IRS had issued no formal prediction-market guidance as of mid-July 2026, so that treatment is an interpretation, not a rule.
• Records: exchange fees, rebates, and early exits all complicate cost basis. A trade log beats a shoebox.

None of this is tax advice. If you trade meaningful size, a CPA who has seen event contracts before is worth the fee.

Apps and User Experience

Both platforms feel closer to a brokerage than a sportsbook, and that is the point. Kalshi’s apps rate 4.7 on the App Store and 4.3 on Google Play as of our check; Polymarket’s iOS app rates a striking 4.8, while its Android app sits at 2.9, the weakest store rating anywhere in this comparison. If you are an Android user leaning Polymarket, try the mobile web app first.

Character differs more than quality. Kalshi reads like a trading terminal: order books, limit orders, portfolio views, and a public API. Polymarket reads like a news feed you can trade: market pages built around headlines, comment threads, and social sharing. Power users will find depth on both; casual traders tend to find Polymarket’s presentation friendlier and Kalshi’s order flow more precise.

Responsible-Trading Tools

This is the clearest gap in the whole comparison, and it favors Kalshi. Kalshi publishes a real toolkit: voluntary self-exclusion for a chosen term, personal funding caps, trading breaks, and a feature that lets trusted contacts monitor account activity. We could find no published equivalent for Polymarket US as of our verification date. Event contracts move like markets but lose like bets, so if guardrails matter to you, that difference is worth weighing seriously. Our responsible gambling resources apply to prediction markets just as much as sportsbooks.

Which Should You Use?

If you made it this far, the split verdict should feel earned rather than evasive: pick Kalshi for sports depth, funding flexibility, and guardrails; pick Polymarket US for cheaper taker pricing, maker rebates, and politics. Plenty of serious traders simply run both and route each trade to whichever venue prices it better. Answer five questions below and we will tell you which way your habits lean.

One more option belongs on your radar: if you only care about sports and want the exchange model with a sportsbook-style interface, Sporttrade is a licensed sports-trading exchange we have reviewed in full, and it is the closest thing to a third contender in this space.