Kalshi vs Polymarket: Comparing the best prediction markets

Kalshi vs Polymarket is the question on every new event-contract trader’s mind in 2026, and the honest answer is it is contingent upon what you care about most from prediction markets – bonus value, market depth or regulatory comfort. Here we compare both platforms for offers, fees and access so you can choose with confidence.Kalshi vs Polymarket US for August 2026But before we go into the full breakdown, here’s the quick overview of how these two platforms stack up right now. PlatformKalshiPolymarket USReferral codeALCOMALCOMBonus offerTrade $25, get $25$20 trading bonus after a $10 minimum depositMinimum deposit$10$10Eligible statesAll US states excluding Massachusetts, Maryland, Michigan, Washington and NevadaAll US states excluding Arizona, Illinois, Michigan, Montana, Maryland, Nevada, OhioLast verifiedAugust 24, 2026August 24, 2026Kalshi vs Polymarket compared: our verdict on eachWe weighted the welcome bonuses and promotional value the heaviest when we compared Kalshi vs Polymarket US (about 60% of our final score). The remaining 40% was made up of platform regulation, trading fees and market variety to deliver a definitive verdict for US prediction market traders.1. KalshiTaking the top spot in our rankings is Kalshi, primarily due to its unbeatable total offer value for new and ongoing users. For US traders weighing whether to open an account with Kalshi or Polymarket US, the sheer size of the Kalshi promo code welcome bonus ceiling serves as the ultimate tiebreaker.Currently, Kalshi leads the industry with a welcome offer that gives new traders a $25 bonus after completing their first $25 in eligible trades. Beyond the initial sign-up, Kalshi delivers consistent ongoing promo and referral value, keeping your bankroll healthy for long-term NFL futures or political outrights.Aside from the elite bonus structure, Kalshi’s biggest fundamental advantage is its regulatory status. As a fully CFTC-regulated exchange, US traders can operate with complete confidence. You can deposit USD directly to your account via bank transfer, debit card or wire. Their taker fees (a little higher at about $1.75 per 100 contracts on 50-cent bets) are a bit higher, but the regulatory peace of mind and huge promotional upside more than compensate for the premium.Kalshi pros and consProsConsGuaranteed bonus: When you trade your first $25, you will automatically receive $25 in bonus trading credits.Higher Fees: Taker fees scale up to ~$1.75 per 100 contracts; maker fees also apply.Fully Regulated: Operates legally in the US as a CFTC-regulated financial exchange.Liquidity Limits: Spreads can occasionally be wider on niche or less popular markets.Fiat Friendly: Direct USD deposits and withdrawals via bank transfer, debit, or wire.Restricted Access: Unavailable in several major international jurisdictions like the UK.2. Polymarket USPolymarket US lands confidently in the runner-up spot. Polymarket excels where it counts for high-volume, data-driven traders: unmatched market depth, worldwide access, and razor-thin spreads.For the tightest spreads and deepest order books, Polymarket US is often the best choice. Polymarket US has been bringing in massive global volume. This translates directly into improved odds and more depth of liquidity across geopolitical, cultural and sports markets. Furthermore, their fee structure is incredibly friendly to market makers, who pay zero fees and can earn a 15–25% rebate on the taker fees generated by their fills. Taker fees are also generally lower across most market categories.However, the platform does make it very accessible for newer traders to begin trading without having to commit a lot up front in terms of promotion. Currently, the Polymarket promo code offers a $20 bonus with a $10 deposit, which instantly triples your initial trading power. It’s a fantastic, low-barrier welcome offer for those who prioritize immediate percentage returns over Kalshi’s high-ceiling randomized draw.Polymarket US pros and consProsConsElite Liquidity: Massive global volume ensures tight spreads and highly accurate odds.Lower Bonus Cap: The maximum welcome offer value is significantly lower than Kalshi’s.Competitive Fees: Cheaper taker fees on most markets and lucrative rebates for makers.Strict Withdrawal Rules: Active traders looking to quickly move their bankroll can be very frustrated by the strict First-In-First-Out (FIFO) withdrawal rule and the slow “funds in flight” clearance times.Zero-Fee Markets: There are no fees on its geopolitical event contracts.Limited Sports Coverage: The platform covers huge global events but often lacks depth in its sports markets. Just as deep NFL game props, certain PGA tournament markets or weekly UFC fight outcomes are things that avid sports traders need.For readers who want the full category breakdown before choosing, our prediction markets review covers every major platform side by side, along with how each one fits into the broader Polymarket vs. Kalshi landscape.How Kalshi and Polymarket US work: event contracts and order booksBoth platforms run on the same basic building block, the event contract, even though they structure trading differently under the hood. Understanding this mechanic first makes every other comparison point in this Polymarket vs Kalshi breakdown easier to follow, from pricing to payouts, and it explains why the two platforms can list nearly identical events yet price them slightly differently at any given moment.What a prediction market/event contract isBoth Kalshi and Polymarket describe themselves as exchanges rather than sportsbooks, and that framing matters legally and practically. An event contract is a binary financial instrument tied to a real-world outcome, will a bill pass, will a team win, will inflation come in above a threshold. You buy “Yes” or “No” shares, and the contract only pays out once the underlying event resolves according to a pre-set rulebook. This resolution mechanism is the core of the difference between Kalshi and Polymarket US in how each platform lists, prices, and ultimately settles those contracts once an event concludes. On Kalshi, the exchange itself determines the final resolution based on its published rules; on Polymarket, disputed outcomes can go through a decentralized oracle system where token holders vote on ambiguous results.Price = implied probabilityContract prices trade between $0.01 and $0.99, and that price is effectively the market’s implied probability of the outcome. A contract priced at $0.70 suggests traders collectively see roughly a 70% chance of a “Yes” resolution, while a contract sitting at $0.10 implies the crowd sees that outcome as unlikely. As new information arrives, a poll shifts, an injury report drops, an economic release beats expectations, the price shifts in real time to reflect the updated consensus. At settlement, every contract resolves fully to either $1 or $0, with no in-between outcome regardless of how close the final result was.Order books, liquidity and how a winning position pays outBoth platforms rely on order books that match buyers and sellers at agreed prices, though the depth of that book varies meaningfully by market and by platform. A winning position pays $1 per contract held at resolution, minus any applicable fees; a losing position pays $0, and there’s no partial credit for a close call. Thin Order books can widen spreads and make it harder to exit a position before resolution, which is one reason liquidity matters just as much as headline pricing when picking which market and which platform to trade on for a given event.Kalshi vs Polymarket US welcome offers and promos comparedWhen comparing the top prediction exchanges, the overall value for prediction markets promos is often the final determining factor. A look at both platforms makes it clear who is in the lead. Differences in welcome offers, trading credits, and ongoing bonuses can significantly affect your starting bankroll and help determine which platform gets your action.Kalshi welcome offer and total promo valueFor active traders currently deciding between Kalshi or Polymarket US, Kalshi boasts the highest-ceiling welcome offer in the regulated US market. Rather than a standard fiat deposit match, Kalshi utilizes a tiered “trade and get” structure designed to reward immediate market participation. New users who register, clear verification and settle at least $25 in event contracts receive a randomized trading credit that scales up to $500 with Kalshi promo code ALCOM.While the maximum $500 tier is mathematically reserved for a smaller percentage of new accounts, the baseline structure ensures that every qualifying user receives a minimum guaranteed payout of at least $15. Many new accounts will be locked into the $35 or $75 tiers. This upside variance makes Kalshi’s promotional offering very enticing to users willing to meet the initial trading volume requirement of $25. On top of that, Kalshi has great overall promo value through its ongoing referral bonuses and event-specific trading credits that heavily incentivize long-term volume during periods of peak liquidity like the NFL season or major election cycles.Polymarket USThe approach to user acquisition in the Polymarket vs Kalshi debate is vastly different and more accessible. Instead of high-variance trading credits, Polymarket typically relies on straightforward deposit-style offers for its new US users. Most recently, sign-ups utilizing an affiliate code have been able to secure a guaranteed return, often structured as a simple “Deposit $10, Get a $20 trading bonus.”While Polymarket’s maximum bonus cap is objectively much lower than Kalshi’s potential $500 windfall, the distinct advantage here is predictability. As soon as a new user deposits the necessary equivalent, they receive the exact bonus amount promised. This is a 3X initial buying power from the very beginning. The fixed-return model on Polymarket is very attractive to low-volume or newer traders who would rather have an immediate, guaranteed boost to their capital than a random draw.How prediction market bonuses work: Decoding deposit-match,trading-credit terms and eligibility (18+, new-users-only, KYC)It’s important to understand how these promotions work before you go into the markets on either platform. To use your capital effectively, you should regularly check how different prediction market bonuses work in the wider event-contract sector.Usually, there are three main structures built for prediction market promotions:Deposit-match offers: The exchange will match a percentage of your initial fiat deposit with proprietary trading credits.Trading-credit offers: These are usually structured as “trade X, get Y”. The user is required to trade a certain dollar amount in the live markets before the bonus money is released by the platform.Referral bonuses: Incentives for the existing user and their referred friend when the new account has met minimum deposit and trading thresholds.It’s worth remembering that real money is at stake in event contract trading and you should never view a bonus as “risk-free”. These offers are merely add-ons to your bankroll, and all trades made with promo funds are subject to standard market volatility.Finally, all promotions are subject to strict industry eligibility criteria. These bonuses are explicitly for new users only, meaning duplicate accounts are instantly flagged. Because platforms operate under severe regulatory scrutiny, every user must pass mandatory KYC (Know Your Customer) identity verification to claim any funds. You must be 18+ (and 21+ in select restricted states) to trade, and standard geographic restrictions strictly apply based on your local jurisdiction.Regulation and legal status: CFTC-regulated DCM vs the restKalshi and Polymarket US are federally authorized. Kalshi and Polymarket US operates as a natively regulated US entity designed for the American financial system.Kalshi, as a CFTC-regulated Designated Contract Market (DCM)Kalshi’s foundational advantage in the US is its status as a federally regulated Designated Contract Market (DCM), approved and overseen directly by the Commodity Futures Trading Commission (CFTC). This is the exact same regulatory framework that governs massive traditional financial markets like the Chicago Mercantile Exchange (CME).This DCM status provides important legal and financial protection to users. Kalshi is required to hold customer funds in segregated US bank accounts, so your deposits cannot be used for Kalshi’s operating expenses. It also means Kalshi is subject to rigorous federal scrutiny for market manipulation, trade reporting and system integrity. Because it is a regulated US financial institution, it interfaces seamlessly with the traditional banking system, allowing for direct USD deposits and withdrawals via ACH or wire, while automatically generating 1099 tax forms for your trading activity.Polymarket US regulatory model and where it differsHistorically, Polymarket operated outside of the US regulatory perimeter, leading to a 2022 CFTC settlement that forced the platform to geo-block American users. However, in late 2025 the company acquired a CFTC-regulated exchange (QCEX) and thus gained an Amended Order of Designation. This regulatory sleight of hand allowed them to submit a compliant “Polymarket US” application.While the Polymarket US app now holds DCM status mirroring Kalshi’s federal standing, the underlying infrastructure differs. Polymarket’s global platform was built on the Polygon blockchain, but it now complies as a US entity with CFTC rules on segregated funds and market integrity. State availability and restrictions — why access variesIf you are wondering, “are prediction markets legal in my state?”, the answer requires checking the platform directly, as availability is constantly shifting due to ongoing legal battles.Even though both Kalshi and Polymarket US are federally regulated by the CFTC, individual state gaming commissions and attorneys general frequently attempt to block them, arguing that event contracts resemble sports betting or gambling, which are regulated at the state level. The CFTC and the platforms are actively fighting these state restrictions in federal court, arguing that federal law preempts state gambling statutes.Because of this intense, ongoing litigation (which recently saw significant activity in states like Michigan, Nevada, and Tennessee), platform access is highly volatile. Availability varies by state, check the platform directly. Do not rely on third-party lists, as they are often outdated before they are published; instead, verify your eligibility during the platform’s sign-up process.Markets and event coverage comparedWhile both Kalshi and Polymarket US have extensive event catalogs, they structure their menus in fundamentally different ways. Kalshi has very structured, very definitive outcomes that are driven by domestic relevance. Polymarket has a wider, faster-moving set of global events. Depending on what you prefer to trade, this distinction heavily impacts where you should park your capital.Politics / ElectionsBoth platforms shine brightly in political forecasting, but they cater to slightly different audiences.Kalshi focuses heavily on structured US political outcomes. You will find deep, highly regulated markets for presidential elections, congressional control, and Supreme Court nominations. Their contracts are typically binary and settled based on official, undeniable data sources like the Federal Election Commission or official congressional vote tallies.Polymarket US, drawing from its global DNA, often features a wider aperture. While it covers the same major US elections, it frequently spins up fast-moving, niche political contracts based on immediate news cycles. You might find markets on debate performance metrics, specific candidate polling numbers, or even geopolitical developments that Kalshi’s strict regulatory approval process might deem too subjective or difficult to instantly verify.SportsSports trading is a major battleground in the Polymarket vs Kalshi comparison, and this is where Kalshi has historically invested heavily to capture the US retail audience.Kalshi offers a highly polished, sportsbook-like experience. You will find deep liquidity on NFL futures, NBA game outcomes, and major domestic sporting events. The interface is intuitive for traditional sports bettors, and the markets are structured precisely like familiar moneylines or futures contracts.Polymarket US is rapidly expanding its sports coverage, but its strength often lies in edge cases and real-time narrative markets rather than traditional game lines. While you can trade the Super Bowl winner, you might also find contracts on specific player milestones, organizational drama, or cross-sport meta-narratives that appeal to a more plugged-in, internet-native audience.Economics and financials (Fed, CPI, Jobs) For data-driven traders focused on macroeconomics, Kalshi is the undisputed leader.Because Kalshi is integrated with the traditional financial system, it offers institutional-grade markets on critical economic indicators. You can trade on specific Fed rate hike decisions, upcoming CPI (inflation) prints, non-farm payroll reports, and even weekly jobless claims. These contracts appeal heavily to financial professionals hedging real-world portfolio risk.Polymarket US does offer some macro-economic markets, but it is rarely the primary focus. Their financial markets often lean more toward the intersection of politics and the economy rather than pure, raw data releases.Culture eventsThis category highlights the divide between the two platforms.Polymarket which was built on blockchain technology, is the natural home for fast-moving internet culture events. If you want to trade on specific token price milestones, the outcomes of major Web3 legal battles, or even the virality of a specific meme or social media trend, Polymarket will likely have a market for it. Kalshi, conversely, generally avoids hyper-niche cultural specific markets. Cultural contracts are usually awarded to big, mainstream events with clear outcomes, think the Oscars, the Grammys or major box office milestones.Fees, spreads and trading costsWhen comparing the Kalshi and Polymarket fees, traders should look well beyond the headline commission rates. The true cost of participating in prediction markets is a three-part equation: baseline platform commissions and the hidden tax of bid-ask spreads that ultimately dictates your long-term return on investment.Kalshi fee model (maker/taker, deposit fees)Kalshi utilizes a traditional, regulated exchange fee structure built around a dynamic maker/taker model. For taker traders buying instantly at the current market price, fees scale based on the contract’s implied probability. These taker fees peak at roughly $1.75 per 100 contracts when trading 50-cent (coin-flip) odds. Maker fees are also applied to those providing liquidity via limit orders, meaning the platform monetizes both sides of the ledger. While these per-contract trading costs can slowly take away from your profit margins for high-volume participants, Kalshi significantly offsets this with zero deposit friction. Standard ACH transfers and withdrawals are entirely free. This means that if you deposit $500, exactly $500 enters your trading bankroll without any third-party payment fees.Polymarket US fee modelIn contrast, the Polymarket US fee model is engineered specifically to attract massive market depth. Their structure heavily favors market makers. Makers pay absolutely zero fees and can actually earn a 15% to 25% rebate generated from the taker fees on their filled orders. For takers, the baseline fees remain significantly cheaper than Kalshi’s on most major contracts. Spreads, liquidity costs and small-vs-large trader impactThe most overlooked trading cost on any exchange is the bid-ask spread the gap between the highest buy price and the lowest sell price. Because Polymarket aggressively subsidizes makers with rebates, its order books are extraordinarily deep. This elite global liquidity creates penny-tight spreads, meaning large-volume traders can enter and exit heavy positions with virtually zero slippage. On Kalshi, while major markets are highly liquid, spreads on niche or less popular contracts can sometimes widen to a few cents. For a casual, small-stakes retail trader trading $50 on an event, a slightly wider spread or Kalshi’s nominal taker fee is negligible, making its free fiat deposits much more attractive. But for large-scale professional traders who move significant volume, Polymarket offers a superior environment to maximize long-term profitability with tight spreads and cheaper taker fees.Liquidity, volume and market depthStrong liquidity and trading volume are the lifeblood of price accuracy in the prediction market structure. High volume means tighter bid-ask spreads and it ensures that the traders can get instant fills at full size without suffering severe price slippage. If you are hedging a portfolio or predicting sports outcomes, the volume will determine your true cost of entry and exit.Kalshi liquidity and trading volumeIn the Polymarket vs Kalshi market share, Kalshi dominates the regulated, fiat-first domestic market. They hold heavy concentrations of liquidity in marquee events. Kalshi has good volume to absorb a decent-sized order if you are taking a position on large NFL futures or large US political races. The platform has been working around the clock to create a dependable pool of liquidity with institutional market makers, ensuring consistent fills during regular trading hours. Away from those headline markets, the volume can sometimes dry up. In smaller, niche events such as preliminary UFC fight cards or minor economic prints, order books can thin out, resulting in slightly wider spreads and slower execution times for larger block orders.Polymarket US liquidity and trading volumeIn the battle of Kalshi vs Polymarket US volume, Polymarket US has a big edge due to its underlying global architecture. This deep liquidity translates directly into incredibly tight spreads and hyper-accurate pricing across a vast menu of contracts, moving rapidly to absorb breaking news. Because the platform heavily incentivizes market makers with lucrative fee rebates, order books remain remarkably thick even on obscure cultural or real-time narrative markets. For traders looking to move significant capital quickly without dragging the price, Polymarket’s structural liquidity pool is a distinct advantage.Market depth, cross-platform arbitrage and who thin liquidity affectsMarket depth ultimately determines how much capital you can deploy before you negatively impact your own fill price. Thin liquidity severely punishes large-scale traders through slippage, where the lack of available contracts at the top of the Order book forces them to accept progressively worse prices just to complete their trade. Casual retail users placing minor trades rarely feel this friction, but for professionals, it is a primary concern. Furthermore, differing levels of volume create distinct pricing inefficiencies between the two exchanges. Sharp traders watch for these discrepancies. When the localized odds are briefly different due to volume surges on the isolated platform, they take the other side of the exact same event on the other platform and lock in a guaranteed profit. This is known as Kalshi vs. Polymarket arbitrage .Funding, withdrawals and securityGetting your capital securely onto an exchange and swiftly back into your hands after a winning prediction is where the operational difference between Kalshi and Polymarket US becomes most apparent. Deposit methodsKalshi operates as a traditional US financial institution, you can easily connect your bank via Plaid for instant ACH transfers, wire funds directly, or utilize a standard debit card. Polymarket US offers a experience to cater to all users. When traders log in, they can click the Deposit button and select the “Use Cash” tab to fund their accounts through integrated third-party on-ramps with Apple Pay, debit card, or standard bank transfers.Withdrawals and payout speedKalshi’s withdrawal process is like a normal stock brokerage account. ACH transfers usually take one to three business days to arrive in your personal bank account, while wire withdrawals can arrive the same or next business day.Polymarket US has strict withdrawal rules in an effort to maintain compliance with US standards. First, you cannot make a withdrawal until all “funds in flight” are fully settled. Deposits via debit card or ACH take three to four business days to completely process, whereas wire transfers clear in one business day. You can actively trade while these funds are clearing, but you cannot cash out. Additionally, Polymarket US mandates an Original Funding Source rule executed via a First-In-First-Out (FIFO) method. If you deposit $100 via debit card and later add $200 via ACH, your first $100 withdrawn is legally required to return directly to that initial debit card.KYC, verification and account safetyBecause both exchanges operate under the strict oversight of the CFTC, mandatory Know Your Customer (KYC) identity verification is non-negotiable. To trade on either platform, you must provide your full legal name, address, date of birth, and Social Security Number to ensure compliance with federal anti-money laundering laws.In terms of account safety, Kalshi holds customer deposits in segregated US bank accounts, providing the gold standard of traditional financial security. Polymarket US also follows federal segregation rules for customer assets. Ultimately, both platforms offer institutional-grade security, but Kalshi’s pure-fiat system completely eliminates the minor network risks inherently associated with blockchain protocols and stablecoins.App and platform experienceWhen deciding between Kalshi or Polymarket US for your daily trading, day-to-day usability matters just as much as market depth. Fortunately, both platforms now offer highly rated, polished native iOS and Android applications, providing a clean mobile experience that completely outclasses older, web-only prediction exchanges.Kalshi app and usabilityKalshi designed its mobile app to feel like a modern stock brokerage rather than a sportsbook. The interface is certainly clean, intuitive and designed for traditional retail traders with an impressive 4.8 star rating on the App Store. You can switch between sports, politics and economic markets in a few taps and easily track your open positions on a dedicated portfolio page.The entire funding process feels very seamless because Kalshi operates strictly on fiat. You can link a bank account and fund your wallet right there in the app, without ever having to deal with confusing blockchain lingo. The platform also has great customizable push notifications to let you know when there are sudden price movements in your tracked markets. But some users have reported occasional lag or UI clutter during peak traffic events such as major elections, suggesting the app can sometimes struggle under the strain of massive live trading volume.Polymarket US app and usabilityPolymarket’s US app is a great example of how to successfully bridge a complex site to a simple, high-utility mobile app. Polymarket US is a great looking app with solid ratings on both major app stores (4.6 stars iOS / 3.6 stars Android), and their Order books are easy to read. Market pages load quickly, making trading fast-moving, global news incredibly easy.The actual mechanics of trading are surprisingly simple in a way that is very beginner friendly. You don’t need to be familiar with trading to buy and sell event contracts, just a few intuitive taps. There’s a bit of friction with the app, especially around onboarding and funding. The experience of browsing day to day is extremely smooth and provides you with an engaging visual way to interact with the world’s deepest prediction markets from your phone.Kalshi vs Polymarket comparison: which should you choose?When asking what’s better Kalshi vs. Polymarket US, the answer entirely depends on your trading profile. There is no single correct platform. To determine whether you should fund an account with Kalshi or Polymarket, you must honestly assess your priorities.Best for simple US accessKalshi is the undisputed winner for casual, traditional American retail traders, because it operates as a native US entity regulated directly by the CFTC. You can link your bank account via Plaid, deposit USD directly and trade with the confidence of federal oversight. Best for global and market depthIf you prioritize raw volume, tight spreads, and a massive catalog of fast-moving cultural events, Polymarket US takes the crown. While it now complies with US regulations its zero-fee maker rebates and granular, news-cycle-driven markets, Polymarket is incredibly enticing for high-volume traders and market makers.Best for the strongest offer valueFrom a pure bankroll-building perspective, Kalshi delivers the most lucrative welcome package. When comparing the platforms through an exclusive bonuses and promos lens, the Kalshi promo code ALCOM gets up to a potential $500 trading credit with a trade of $25 or more, vastly outperforms the Polymarket promo code $20 bonus when you deposit $10. If your primary goal is maximizing your starting capital and extracting the highest possible promotional value from a new sign-up, Kalshi provides a vastly superior ceiling for users willing to meet the initial trading requirements.When it’s worth using bothFor dedicated prediction market participants, the smartest strategy is often funding accounts on both platforms. Because Kalshi and Polymarket rely on different user bases and underlying liquidity pools, their implied probabilities on the exact same event frequently diverge. By keeping capital ready on both exchanges, you can actively line-shop for the best possible price just like you would with traditional sportsbooks or even execute cross-platform arbitrage strategies to lock in guaranteed profit when the spreads temporarily cross.Why is Kalshi legal but Polymarket restricted in some states?Both platforms are federally authorized Designated Contract Markets under the Commodity Futures Trading Commission (CFTC), but their operations are frequently challenged by state-level gaming regulators. State attorneys general often argue that prediction markets resemble online gambling or sports betting, which are strictly regulated at the state level. Because these federal-versus-state jurisdictional battles are actively playing out in court, access fluctuates from state to state.Is Kalshi or Polymarket US better?Neither platform is objectively better; your choice depends entirely on your trading style. If you are a traditional retail user looking for a smooth experience with instant bank transfers and huge welcome bonuses, Kalshi is your best option. Polymarket US, in contrast, is better for high-volume traders who want the most global market depth, the tightest spreads and a vast catalog of fast-moving cultural and geopolitical events.Is Kalshi or Polymarket US bigger by trading volume?When comparing Kalshi vs. Polymarket US on a global scale, Polymarket is vastly larger. Polymarket processes tens of billions in monthly trading volume, routinely dwarfing its competitors. However, when isolating the strictly regulated US domestic market, Kalshi captures a massive share of the retail volume especially in structured US political markets, economic data prints, and traditional sports outcomes.What’s the difference between Kalshi and Polymarket US?The core difference between Kalshi and Polymarket US lies in their financial infrastructure. Kalshi was built from day one as a traditional US financial institution that operates entirely on USD. You fund it exactly like a stock brokerage account. Polymarket originated as a decentralized, global platform built on the Polygon blockchain. Polymarket US now complies with domestic CFTC regulations and users can deposit with Apple Pay, debit card, or standard bank transfers.How do Kalshi and Polymarket US work?Both platforms operate as centralized Order book exchanges, meaning they are not sportsbooks going against you. Users trade binary event contracts essentially “Yes” or “No” shares priced between $0.01 and $0.99. The contract price represents the market’s implied probability of an event happening; for example, a $0.40 “Yes” contract implies a 40% chance of occurring. When the event concludes, the winning contract resolves at exactly $1.00, while the losing side resolves at $0.00. You are strictly trading peer-to-peer against other users.Can you arbitrage between Kalshi and Polymarket US?Yes, arbitrage is entirely possible. Because Kalshi and Polymarket US attract different types of users and feature vastly different liquidity pools, the implied probability or price of the exact same event can temporarily diverge across the two platforms. Smart traders hunt for these discrepancies and do cross-platform arbitrage, purchasing the “Yes” contract on one exchange and the “No” contract on the other, if the total price is less than $1.00, locking in a profit.Is Kalshi or Polymarket US more accurate?Market accuracy is directly tied to liquidity. Because Polymarket attracts a massive global user base and significantly higher total trading volume, its prices are generally considered hyper-efficient and incredibly accurate on a macro scale. However, for highly specific, US-centric events such as NFL or NBA futures or Federal Reserve rate decisions Kalshi’s concentrated volume provides equally sharp, highly accurate forecasting data.How do Kalshi and Polymarket US make money?Because neither platform takes a directional position against its users, they do not rely on you losing to generate a profit. Instead, both exchanges make money by facilitating trades. Kalshi charges a small, per-contract transaction fee that scales based on the contract’s price, while also earning interest on idle customer cash balances and licensing its data feeds. Polymarket US operates a category-based fee model that charges “takers” (those buying at market price) while providing zero fees and rebates to “makers” (those providing liquidity), while similarly profiting from platform integration and revenue-sharing.If you purchase a product or register for an account through a link on our site, we may receive compensation. By using this site, you consent to our User Agreement and agree that your clicks, interactions, and personal information may be collected, recorded, and/or stored by us and social media and other third-party partners in accordance with our Privacy Policy.