Published on: 31/07/2026
How Polymarket’s Prediction Markets Actually Work
Polymarket prediction markets let traders buy and sell shares in the outcome of real-world events — an election, a Fed decision, a CS2 grand final — with share prices acting as live, tradable probabilities. It’s the largest prediction market in the world by trading volume, and 2025-2026 turned it from a crypto-only, US-blocked platform into something bigger: a global exchange running alongside a separate, CFTC-regulated US app. This guide covers how it actually resolves markets, what it costs to trade in 2026, and where it stands next to a regulated-only platform like Kalshi.
Key takeaways
- Polymarket doesn’t resolve its own markets. Outcomes go through UMA’s Optimistic Oracle — a bond-and-dispute system, not a Polymarket employee marking a bet “won.”
- The 2025-2026 US relaunch happened in stages. Polymarket bought a CFTC-licensed exchange (QCEX) for $112 million in July 2025, won an amended CFTC order in November 2025, launched a separate “Polymarket US” app invite-only in December 2025, and opened it to US iOS users without a waitlist in May 2026.
- Fees are category-based, not flat. Many markets — notably geopolitics — carry zero trading fees; sports, politics and crypto markets carry a taker fee that peaks at the 50¢ price point and shrinks toward the extremes.
- Esports is a real, growing category. CS2 alone runs into the hundreds of active markets, and League of Legends spans a dozen regional leagues plus Worlds and MSI — priced by traders, not set by a bookmaker.
- Polymarket and Kalshi solve the same problem differently. Kalshi is USD-only and regulated end to end; Polymarket’s global site still runs on USDC, with the regulated US app as a separate, dollar-settled option.
What Polymarket’s prediction markets actually are
Polymarket is a peer-to-peer prediction market: instead of betting against a bookmaker, you buy or sell shares priced between $0.01 and $0.99, and a share settles at $1 if the outcome happens or $0 if it doesn’t. The price at any moment is the market’s implied probability — a contract trading at 70¢ reflects traders collectively pricing that outcome at roughly 70%. You aren’t locked in until the event finishes, either; you can sell a position at any point to lock in a gain or cut a loss, which is the main structural difference from a fixed-odds bet.
Internationally, Polymarket has always run on USDC — a dollar-pegged stablecoin — settled on-chain, which is why it built its user base outside the US in the first place: no US bank rails were needed to trade. The platform itself is non-custodial software sitting on top of that settlement layer, not a broker holding your cash. That architecture is also why Polymarket historically operated at arm’s length from the CFTC, and why the 2025-2026 US relaunch (below) required buying an actual regulated exchange rather than simply flipping a switch.
How Polymarket resolves markets: the UMA oracle
The mechanism that makes Polymarket different from a sportsbook is how a market gets marked “resolved.” Polymarket doesn’t decide outcomes itself — it outsources resolution to UMA’s Optimistic Oracle, a system built around bonds and a dispute window rather than a company employee checking a box.
Once a market’s end condition is reached, a proposer submits the outcome and posts a bond (commonly around $750 in USDC.e for Polymarket markets). A two-hour dispute window then opens: if nobody challenges the proposed outcome, it finalizes and the proposer gets the bond back plus a small reward. If someone disputes it by posting a matching bond, the request escalates — a second dispute sends it to UMA’s Data Verification Mechanism, where UMA token holders vote on the correct outcome over a roughly two-to-four-day period. Once the DVM finalizes a result, it’s treated as immutable; Polymarket itself has no admin key to override it.
This is genuinely different from how a sportsbook settles a bet, and it isn’t without friction — high-profile or ambiguously worded markets have occasionally triggered contentious, closely-watched disputes, and critics have pointed to oracle-manipulation risk as the model’s clearest weak point. It’s a trade-off: the process is transparent and auditable on-chain, but resolution speed and finality depend on bonded participants acting honestly, not on a regulator standing behind the settlement the way it does with Kalshi’s exchange-run markets.
Polymarket’s fees in 2026: what trading actually costs
Polymarket’s biggest selling point has always been cost, and that held even as it introduced a proper fee schedule through 2026. The structure is category-based and applies only to takers — traders whose order fills immediately against the existing book. Makers, who place resting limit orders that add liquidity, generally pay nothing, and Polymarket redistributes a share of collected fees back to makers daily through its rebate program.
| Market category | Peak taker fee (at 50¢) |
|---|---|
| Geopolitics / world events | 0% — fee-free |
| Sports | ~0.75% |
| Politics, finance, tech, mentions | ~1% |
| Crypto | ~1.8% |
| Maker orders (any category) | 0% |
Two details matter more than the headline numbers. First, the fee curve peaks at the 50¢ midpoint and falls sharply toward the extremes — a contract trading at 5¢ or 95¢ costs a fraction of the fee a 50/50 contract does. Second, funding costs sit outside this table entirely: converting a card payment into USDC to trade internationally typically costs 1-3%, while the regulated US app’s dollar funding removes that step. Compared with the wider field of regulated platforms, Polymarket is still usually the cheapest place to hold a position to expiry, which is a big part of why it stands out on cost.
The 2025-2026 US relaunch: from CFTC ban to regulated exchange
Polymarket’s relationship with US regulation has a real history, and it explains why “Polymarket” and “Polymarket US” aren’t quite the same thing. In 2022, the CFTC fined the company and ordered it to block American users for operating an unregistered derivatives exchange — after that, US traders who wanted in largely used VPNs. That changed through a deliberate, multi-step process in 2025-2026:
The entity behind the US product is QCX LLC, doing business as Polymarket US — a CFTC-designated contract market in its own right, legally distinct from the offshore site global users have traded on for years. In April 2026, Polymarket separately asked the CFTC for permission to let US residents trade directly on that original global exchange too, on top of the standalone US app — a sign the two products may eventually converge. By June 2026, CNBC reported Polymarket’s annualized revenue had passed $1 billion within six weeks of the US exchange going live, and the World Cup Winner market alone drove billions in volume ahead of the 2026 final. As of mid-2026, a handful of states — including Nevada, Arizona and Ohio — still restrict or dispute sports-related contracts specifically, so always check availability inside the app before funding an account.
What you can actually trade: Polymarket’s market categories
Polymarket’s category list is broader than a sportsbook’s, which is the core of its appeal to news-driven traders. The main groupings in 2026 are:
- Politics and geopolitics — elections, legislation, court rulings, war and diplomacy outcomes; this is Polymarket’s original core and still its deepest liquidity.
- Sports — game winners, tournament outcomes and season-long markets across major US and global leagues, priced independently of any sportsbook’s line.
- Crypto — token price thresholds, protocol events and exchange-specific outcomes, popular with the platform’s crypto-native base.
- Pop culture and entertainment — awards shows, celebrity and public-figure “mentions” markets, and cultural moments; see our awards season prediction markets coverage for how that category trades.
- Economics and business — Fed decisions, inflation prints, earnings and macro data releases.
- Esports — covered in depth below, and a category that behaves quite differently from the rest of the list.
Fast-moving news is where Polymarket’s model shows its biggest edge over a fixed-odds book: prices can reprice within seconds of a headline, which is exactly the dynamic our breaking news prediction markets guide walks through in detail.
Polymarket esports prediction markets: what’s actually listed
Esports is a genuine, expanding vertical on Polymarket rather than a token afterthought. The platform runs dedicated sections for Counter-Strike 2, League of Legends, Dota 2, Valorant, Call of Duty, Overwatch, Mobile Legends, Rainbow Six Siege, Rocket League, Honor of Kings and StarCraft II, among others, and the market count reflects real trading interest: CS2 alone regularly carries several hundred active markets, and League of Legends runs simultaneous markets across roughly a dozen regional leagues — the LCK, LPL, LEC and LCS among them — plus international events.
Tournament-level markets are where volume concentrates. Around the League of Legends calendar, Polymarket lists season-winner markets for individual leagues (an “LPL 2026 Season Winner” market, for instance), regional markets for international events (a “Worlds 2026 Winning Region” contract weighing each region’s chances), and dedicated winner markets for MSI. On the Counter-Strike and Valorant side, majors and franchised events — IEM tournaments, PGL Majors, the Esports World Cup, DreamLeague and BLAST-run tournaments — each get their own event page with moneyline markets per match plus outright tournament-winner contracts. Dota 2 sees similar treatment around its own franchised and Valve-backed events.
Mechanically, each match typically resembles a simple moneyline: buy shares in the team you think wins, and a correct call pays out $1 per share. That’s a narrower bet-type menu than a dedicated esports sportsbook offers — you won’t generally find the map-handicap, first-blood or round-total prop markets a specialist book builds around a single match. What you get instead is a price that moves purely on trader supply and demand rather than a bookmaker’s opening line and margin, the ability to exit a position mid-match by selling rather than waiting for the final score, and (for now) a much smaller pool of live in-play markets than a mature esports book runs. For bettors who want the deeper market menu — handicaps, totals, live in-play betting across CS2, League of Legends, Dota 2 and Valorant — a dedicated operator is still the better fit; our esports betting hub covers those sites, and our dedicated esports prediction markets guide goes deeper on how this category compares across platforms.
Polymarket vs. a regulated-only platform: what’s actually different
Kalshi is the clearest point of contrast, and not just because our own top prediction market apps ranking puts them one and two. The practical differences come down to money rails, resolution, and regulatory posture.
| Factor | Polymarket | Kalshi |
|---|---|---|
| Settlement currency | USDC globally; USD on the separate Polymarket US app | USD only |
| Resolution method | UMA Optimistic Oracle — bonds, disputes, token-holder vote | Exchange-run settlement under direct CFTC oversight |
| US regulatory status | Separate CFTC-designated exchange (QCX/Polymarket US) since late 2025 | CFTC-designated contract market since 2020 |
| Strongest category | Politics, geopolitics, world events, esports | US sports, deepest overall US liquidity |
If dollar banking and the deepest US sports order books matter most, Kalshi is the safer default — our full list of prediction markets platforms covers where every other regulated app fits between the two. If cost, global political markets and esports depth matter more than USD-native banking, Polymarket is hard to beat, and its regulated US app is closing that banking gap month by month.
Frequently asked questions
What is Polymarket?
Polymarket is a peer-to-peer prediction market platform where traders buy and sell shares tied to the outcome of real-world events. Share prices function as live probabilities, and a correct share settles at $1 while an incorrect one settles at $0.
Is Polymarket legal in the US in 2026?
Yes, through a separate CFTC-designated exchange called Polymarket US, launched after Polymarket acquired the licensed exchange QCEX in 2025. The app removed its waitlist for eligible iOS users in May 2026, though a handful of states still restrict certain sports contracts, so availability should be checked in-app.
How does Polymarket decide who won a market?
Resolution runs through UMA’s Optimistic Oracle: a proposer posts a bonded outcome, a two-hour window allows disputes, and unresolved disputes escalate to a token-holder vote. Polymarket itself has no ability to override a finalized result.
What fees does Polymarket charge in 2026?
Fees apply only to takers and vary by category — many markets, including geopolitics, are fee-free, while sports, politics/finance/tech and crypto carry taker fees that peak at the 50¢ price point. Makers who place resting limit orders generally pay nothing.
Can I trade esports markets on Polymarket?
Yes. Polymarket lists markets across CS2, League of Legends, Dota 2, Valorant, Call of Duty, Rocket League and several other titles, covering both individual matches and tournament-winner outcomes for events like Worlds, MSI and major CS2/Valorant LAN events.
Is Polymarket the same as Kalshi?
No. Both are prediction market platforms, but Kalshi is a USD-only, CFTC-regulated exchange that has operated in the US since 2020, while Polymarket’s global platform runs on USDC and only gained its own separate CFTC-regulated US app in late 2025.
Do I need cryptocurrency to use Polymarket?
On the international site, yes — funding and settlement run through USDC. The newer Polymarket US app is built for dollar funding instead, which removes that requirement for US-based traders using the regulated version.
Is Polymarket safe to use?
Polymarket is non-custodial and its resolution process is publicly auditable, which adds transparency, but it also carries risks distinct from a regulated USD exchange: smart-contract exposure, oracle-dispute delays, and (on the international site) reliance on crypto wallets and stablecoins rather than deposit insurance.
Read next: our prediction markets guide for the fundamentals, or check the Coinbase prediction markets page if you’d rather trade event contracts from an exchange you already use.
For background on the mechanics discussed above, see Polymarket’s own help center and the July 2025 acquisition announcement.
18+. Prediction markets involve real financial risk — contracts can expire worthless, and you should never trade with money you can’t afford to lose. If gambling or trading stops being fun, seek support from a problem-gambling helpline in your country.
