In 2024, Polymarket cleared $9 billion in trading volume. Kalshi did $1.5 billion. Manifold did about $50 million — in play money.
Three platforms. Wildly different sizes. Wildly different products. If you're trying to figure out which prediction market is right for you, the answer depends on what you actually want to do.
The three platforms in 30 seconds
Polymarket: the biggest. Crypto-based (USDC). Unregulated in the US. Huge liquidity on big-ticket markets (elections, sports, crypto). Available in most of the world but blocked for US users via official channels.
Kalshi: the regulated one. CFTC-licensed. US dollars, fiat-based. Available in all 50 US states. Now listed on Robinhood. Smaller markets than Polymarket but growing fast on political and event contracts.
Manifold: the play-money one. No real money. No regulatory issues. The largest catalog of markets — over 100,000 — because anyone can create one. Used for forecasting practice, internal company decisions, and obscure questions Polymarket would never list.
Polymarket: the deep-liquidity giant
If you want to trade the most-discussed event in the world, Polymarket is where the most money sits. The 2024 US presidential election market had over $3 billion in cumulative volume. The Super Bowl LIX market hit $50 million. Bitcoin year-end price contracts regularly clear $20 million.
Pros: Deep liquidity means tight spreads (often 1-2 cents). Major event coverage. Order book is fast. Resolution is generally clean — they pay out within hours of confirmed outcomes.
Cons: Crypto-only. You need USDC to participate, and you need to bridge in. Geographic restrictions are real — US users have used VPNs but it's not officially allowed. Some markets resolve subjectively, leading to disputes (e.g., the 2024 election had small disputes over swing-state calls).
Best for: Traders who want maximum liquidity on big events and are comfortable with crypto wallets.
Kalshi: the regulated workhorse
Kalshi is the only fully-regulated prediction market in the US. Every contract is CFTC-approved. Every payment is in USD. It's now embedded in Robinhood's app, which has made it the easiest on-ramp for US retail.
Pros: Legal in all 50 states. No crypto required. Strong UI for new users. Smaller spread on big political contracts. Regulated dispute resolution.
Cons: Catalog is smaller than Polymarket — maybe 200 active markets vs Polymarket's 600+. Some markets are less liquid (a few hundred dollars of volume rather than millions). Some categories are limited by CFTC rules (e.g., entertainment contracts came late, some sports contracts are still restricted).
Best for: US-based traders who want legal access and dollar-denominated contracts. Also the best on-ramp for first-time prediction market users.
Manifold: the playground that's secretly serious
Manifold uses "mana," its play-money currency. You can buy more with real dollars, but you can't cash out — meaning it's not gambling and avoids regulation entirely.
Pros: Anyone can create a market. The catalog is enormous — over 100,000 active markets covering everything from "will GPT-5 release in 2026" to "will my friend Bob get a girlfriend this year." Internal teams at AI labs, hedge funds, and forecasting firms use Manifold for internal predictions. Calibration tracking is built into every user profile.
Cons: Play money means lower stakes, lower information density. A 70-cent Manifold price is less calibrated than a 70-cent Polymarket price because traders aren't risking real wealth. Markets can resolve subjectively because the creator decides.
Best for: Forecasting practice, niche questions, internal team use, and traders training their calibration before going to real-money platforms.
How the three compare on the questions that matter
Liquidity (best to worst): Polymarket > Kalshi > Manifold. Order-of-magnitude differences.
Regulatory comfort (most to least): Kalshi > Manifold > Polymarket. Kalshi is CFTC-licensed; Manifold is unregulated but legal because it's play money; Polymarket is offshore and grey-area.
Catalog breadth (most to fewest): Manifold > Polymarket > Kalshi. Manifold has 100k+ markets; Polymarket and Kalshi have curated lists in the hundreds.
Price calibration accuracy: roughly Polymarket ≈ Kalshi > Manifold. Real money sharpens prices. The bigger the market, the sharper the price.
Ease of onboarding (best to worst): Kalshi (via Robinhood) > Manifold > Polymarket (needs crypto wallet).
The platforms nobody mentions but should
PredictIt: still alive, still CFTC-licensed, still capped at $850 per contract per user, mainly political markets. The OG US prediction market.
Metaculus: not a real-money market, but the highest-quality forecasting community in the world. Used by intelligence agencies, top forecasters, and AI safety researchers. Resolution is community-managed and usually rigorous.
Insight Prediction, Crystal Ball, Smarkets: niche European players, mostly sports-focused.
For most readers, the choice is really between Polymarket, Kalshi, and Manifold. The others are specialty tools.
How to choose, in three questions
Question 1: Are you in the US? If yes, start with Kalshi. If outside, default to Polymarket.
Question 2: Do you want to trade real money? If yes, Polymarket or Kalshi. If no, Manifold is fine and useful.
Question 3: Do you want to trade the biggest, most-followed events? Polymarket has the most volume. Kalshi has the broadest US-legal political coverage. Manifold has every other thing in the world.
Where Juno fits in
Juno is building for the audience these platforms underserve. Polymarket is crypto-native and geographically restricted. Kalshi is US-only. Manifold is play money. None of them speak Thai, list Thai-specific markets, or work well on a mobile-first international onramp.
Juno is real-money, geographically broad, language-localized, and built for the kinds of markets that matter in Asia: regional currencies, Fed-driven rate cycles, Asian elections, tourism numbers, regional sports.
It's not trying to replace Polymarket for US elections. It's trying to be the right answer for everyone outside the US current market structure.
The honest bottom line
If you're in the US and want to get started today: open Kalshi via Robinhood. It's the cleanest experience.
If you're outside the US and have a crypto wallet: Polymarket. The depth and volume are unmatched.
If you want to practice forecasting without risking real money: Manifold. The calibration tools alone are worth the time.
If you want all of those features for international users and markets: that's where Juno is heading.
Three platforms, three answers, one question: which one are you opening tomorrow morning?