The 2026 World Cup is about to become the largest testing ground for prediction markets in sports history. With 48 teams competing across North America and billions in global betting volume at stake, traders will have to stick or twist on the CFTC-regulated Kalshi or the onchain heavyweight Polymarket. Beyond the elevator pitch lies a wealth of strategies and tactics unique to each marketplace that could make a seven-figure difference to your 90th minute equity check. It’s never too early to split the difference.
Regulation: CFTC contract market vs offshore onchain venue
The gulf between polling failures and prediction market successes is immediately apparent in the stringent oversight of those trading platforms on which we bet on event outcomes. In 2019, Kalshi emerged to great fanfare as a new exchange for trading in election and other event contracts. Set up by alumni of university research projects attempting to restore the wisdom of the crowds, Kalshi aimed to fill a crucial gap in a prediction market landscape dimmed by prohibitions on various forms of gambling in several US states and criminal laws around global betting on US elections. Yet its entry showed there was still room for innovation where von Neumann and Morgenstern envisioned little more than bookies and bettors.
Polymarket operates as an offshore protocol initially built on the xDai sidechain and later migrated to Polygon, the Layer 2 network of the Ethereum protocol. As an application with an ambiguous regulatory status, the user experiences are noticeably distinct for US and non-US traders. US users are geo-blocked through the frontend, but beyond that, the trading experience is fairly analogous. Most US users leverage VPNs/proxies to access the site.
Kalshi’s CFTC-designated status post-Third Circuit ruling
The ruling by the Third Circuit of Appeals based in Philadelphia that Kalshi’s World Cup is a legally bona fide event-based binary options market , as safe as trading commodity futures , effectively barred all US binary options markets except TeraExchange from the structure. Secondly, the ruling by the CFTC that the contracts are swaps sealed the same outcome. Kalshi is legally compliant: institutional and individual US traders can deposit USD via ACH, be KYC verified, trade the event markets, and receive any winnings directly in their US accounts. Twin 1099 forms make sure the IRS knows where every penny came from and anonymity is a non-issue.
Polymarket’s geofence reality for US traders in 2026
Polymarket’s geofencing exists in the web3 layer. This has trade-offs. It is seamless and guaranteed uncensorable at the protocol level. There is no credit card information to verify residency. Overzealous enforcers have no personal identifying information to surveil and no server logs to subpoena. Conversely, technologically competent and motivated adversarial US residents cannot participate. Polymarket has long banned all US traders from market creation and participation via terms of service and is building in technical enforcement. US residents are freebooters on Polymarket. Polymarket enforces the geofence at withdrawal. In the creation of Augur markets, this resulted in a higher cost to exit the platform.
Liquidity and depth: where the World Cup money actually sits
Almost no users will directly consider this; they instead think in terms of the specific bets they want to make and the opinions they want exposure to. The implicit prediction market consumer is seeking all the benefits of a price discovery engine for their edge without worrying about where the liquidity comes from.
This highlights another key issue: prediction markets need sufficient liquidity to function properly. The more participants and volume in a market, the more accurately it will reflect the crowd’s best possible estimation of the odds. Less liquid markets can be easier to manipulate by a single or few agents, causing the price to be off. This reduces the consensus view’s predictive power, which defeats the purpose of having a market in the first place.
Order book depth for World Cup Winner vs Golden Boot
The real differentiator, however, is the breadth and depth of prop markets. Polymarket lists over 100 markets on each of the men’s and women’s tournaments, with prop markets spanning a variety of player transfers, groups of winners, and total goals themes. Kalshi offers 20, including the basic outrights and player markets. This matters because props can be invaluable. You can certainly find action on who will make the finals, totals, or group-stage performance, but if you’re a sports fan who follows the league regularly and understands teams’ recent form, performance, and overall structure, then props are a gold mine. The World Cup often offers a particularly good example: you can have an opinion on the over/under for total goals and the group construction. You may also have an edge if you’re familiar with specific players, or even know which league they play in.
The cost that prediction markets neglect is the liquidity. If you have a 2-cent bid-offer spread on a $10,000 position that costs you $200 round-trip. So, if you add up a 60-question tournament, it’s not hard to see that it’s a very expensive exercise.
Michael Chen, Head of Trading at Onchain Capital
Fees, spreads, and the breakeven trade
With no platform fees for market makers, the 2 percent win fee effectively functions as a spread. For a popular market like the US unemployment rate, the round-trip spread would be around 1 percent. That’s competitive with binary options, albeit with the usual early exit concerns. Low trading costs are especially important for Polymarket’s market makers, who guarantee liquidity on a wide range of community-created bets.
Kalshi charges zero fees on trades. How do they make money? They are the central counterparty and determine the bid-ask spreads. When there’s a lot of activity , say, during group stage World Cup match days , they might set the spread at just 1 to 2 cents. When there’s little to no activity, e.g. overnight, bigger spreads on less popular markets could be as wide as 5 cents or more. ACH deposits are free, but ACH withdrawals take three to five business days (is Kalshi keeping your money in the interim?) and you can’t use your fiat to trade elsewhere.
Withdrawal latency: fiat ACH vs USDC bridge
With Polymarket’s current gas implementation, that’s not an issue. There are other nontechnical reasons Polymarket could be a more attractive product to traders. The conditional token framework, which allows for trustless resolving of binary or scalar questions, hasn’t been implemented in the same way on Kalshi. Polymarket’s much easier to use on mobile. They have a lot more markets and more volume which are networked effects.
Market coverage: outright, group, props, and exotics
What sets Polymarket apart the most, however, is its UX. Trades are gas-free, and are often just cents to a dollar. It’s aesthetically pleasing, and intuitive to use. Forking the best features of other interfaces, like conditional orders from Augur’s Veil, combined with modern design and a clear performance orientation, yielding one of the most satisfying dapp experiences. It also incorporates a social graph, and ranks the trading performance of users.
Kalshi’s coverage is more conservative. They concentrate on high-volume, granularly-clear markets over which they have direct control. World Cup Winner, Group A Winner, and Match Winner for selected high-profile games are all available, along with a few player props. They’ll rarely list you a tail-outcome or niche angle to trade; but if a mainstream set-piece market is what you’re after, they cover the essentials.
When a prediction market allows the wisdom of the crowd to discover unexpected edges it is in its most brilliant form. Polymarket does this through open market creation. The collective intelligence of the crowd is ingenious, creative, and unpredictable. That is the inspiration behind using prediction markets in the first place. The interesting edge cases you never thought of, the unique insights that no one person could have, come from letting the crowd have as much surface area to interact with the market as you can allow… A gatekeeper approach will always limit that.
Sarah Nguyen, Founder of Crowd Forecasting Research
Settlement, dispute resolution, and counterparty risk
UMA’s optimistic oracle was first proposed by Hart Lambur and Will Villanueva from UMA in their 2018 paper, “Putting Your Money Where Your Mouth Is: An Optimistic Oracle”. You can read the paper here. The oracle is “optimistic” in the sense that it assumes reported data is accurate. As a result, the oracle provides a fast and cheap resolution process for markets. Polymarket assesses the reliability and benefits of the oracle for their markets and comes to their own conclusions for implementation on the platform.
We settle markets internally, using several publicly verifiable data sources (e.g. official FIFA results). Kalshi acts as the central counterparty, there is no peer-to-peer default risk. Settlement is typically processed immediately after the market is resolvable, and our customer support team manages disputes. But you trade decentralization for this convenience. We are the ones you rely on to settle markets fairly and to stay solvent. We are regulated by the CFTC, but are still a single point of failure.
Onchain settlement vs centralized custody
Still, if you’re comfortable trading on centralized exchanges where you trust the custodian to honor withdrawal requests, slippage is a more pressing concern. Polymarket is less liquid and you’ll usually pay higher spreads than on large venues like FTX, which settles roughly 40% of POLY volume. Rough markets with lumpy order books can pose a problem too, and the occasional downtime from Ethereum congestion. However, trading through an FTX account aggregates liquidity from both order books and you’re essentially letting the big fish compete for you.
Your USD is held in segregated accounts at FDIC-insured banks, a structure similar to a brokerage. Your deposit is not commingled with company funds, and CFTC rules mandate that we keep sufficient capital reserves. You have no smart contract risk. However, you do have platform risk, if our systems go down during a crucial match, you won’t be able to exit positions until we are back up.
The decision framework: which trader profile fits which venue
If you’re a US-based trader who doesn’t want to use a VPN, your options are limited. In fact, the San Francisco-based Kalshi is the only CFTC-regulated prediction market. This not only makes it a good choice for staying above board, but also means less in taxes thanks to 1256 contracts. Also, ACH is supported.
Choose Kalshi if you’re US-based or relatively new to crypto. Kalshi guides you through the onboarding process, stores everything in cold storage, and complies with US regulations. Last but not least, you gain access to an alternate but still deep World Cup prediction market. Polymarket and Kalshi’s competitive tension is a win-win for World Cup predictors who will likely shave basis points on the market price.
Hybrid strategies are possible. Do you use Kalshi for large, liquid outright markets where their spreads are competitive and Polymarket for exotic props and niche angles where their depth dominates? That’s capital on both platforms and careful position tracking but allows you to use each to their best advantage. What’s likely to have a lot of volume on both? The 2026 World Cup. And where each excels is not a bad place to start.
The best traders don’t pick one platform and stick with it. They route orders to wherever liquidity and pricing are best, just like equity traders use multiple exchanges.
David Park, Quantitative Analyst at Prediction Labs
Between the regulated venue and the onchain, global protocol, the other elements of the Kalshi/Polymarket duopoly will also influence their own fate. Consider whether your preferred platform embeds sports directly or extends into other forms of prediction, since the network effects will be stronger in the segment you choose. Rearrange those table rows with Kalshi projected above, underdog stories to cheer for, long-term technicals to dig in on, and soon, a lot more action for everyone.