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Practice on live markets. Risk nothing.
Trying to make money on prediction markets? Test every trade first. Prove your edge on live Kalshi and Polymarket order books—with paper money, realistic fees, and zero capital at risk.
Free to startNo card$1,000 paper balance
Portfolio value$1,248.60
+$248.60 · +24.9%kalshiView market ↗
Will Edward Winter win the Winter vs Broom: Round Of 32 match?
YES7¢NO93¢BOOK DEPTH12 levels
Paper moneyReal order booksVenue fees included
Live data from
Supported venues
Your funds never leave your wallet.Live markets
Will Edward Winter win the Winter vs Broom: Round Of 32 match?Yes 7¢No 93¢$52K volWill the U.S. invade Iran before 2027?Yes 28¢No 73¢$45.9M volWill the temp in New York City be above 78.99° on Jul 21, 2026 at 2pm EDT?Yes 59¢No 53¢$3K volWill China invade Taiwan by end of 2026?Yes 4¢No 96¢$38.9M volWill the WTI close price be above 84.09 USD/barrel on July 21, 2026 at 2:00 PM ET?Yes 93¢No 9¢$3K volWill the US confirm that aliens exist before 2027?Yes 6¢No 95¢$36.2M volWill the temp in Los Angeles be above 79.99° on Jul 21, 2026 at 2pm EDT?Yes 50¢No 39¢$3K volWill Trump acquire Greenland before 2027?Yes 4¢No 96¢$35.0M volWill the WTI close price be above 84.29 USD/barrel on July 21, 2026 at 2:00 PM ET?Yes 71¢No 32¢$3K volWill Gavin Newsom win the 2028 Democratic presidential nomination?Yes 20¢No 80¢$26.5M volMjallby wins by more than 3.5 goals?Yes 21¢No 85¢$2K volWill the Iranian regime fall before 2027?Yes 11¢No 90¢$22.8M volWill the temp in New York City be above 79.99° on Jul 21, 2026 at 2pm EDT?Yes 22¢No 79¢$2K volWill there be no change in Fed interest rates after the July 2026 meeting?Yes 88¢No 12¢$22.5M volWill the temp in New York City be above 77.99° on Jul 21, 2026 at 2pm EDT?Yes 79¢No 30¢$2K volWill Gavin Newsom win the 2028 US Presidential Election?Yes 13¢No 87¢$17.5M volWill the temp in Los Angeles be above 78.99° on Jul 21, 2026 at 2pm EDT?Yes 94¢No 6¢$2K volPutin out as President of Russia by December 31, 2026?Yes 9¢No 92¢$17.5M volWill the temp in Chicago be above 83.99° on Jul 21, 2026 at 2pm EDT?Yes 70¢No 31¢$2K volWill the Fed increase interest rates by 25 bps after the July 2026 meeting?Yes 12¢No 88¢$16.8M volWill the temp in Austin be above 94.99° on Jul 21, 2026 at 2pm EDT?Yes 19¢No 82¢$2K volWill the temp in Washington DC be above 90.99° on Jul 21, 2026 at 2pm EDT?Yes 40¢No 70¢$2K volWill the temp in Los Angeles be above 80.99° on Jul 21, 2026 at 2pm EDT?Yes 26¢No 77¢$2K volWill the WTI close price be above 84.39 USD/barrel on July 21, 2026 at 2:00 PM ET?Yes 53¢No 54¢$1K volWill the NASDAQ-100 be above $29173.17 at Jul 21, 2026 at 2pm EDT?Yes 45¢No 57¢$1K volWill the temp in Chicago be above 84.99° on Jul 21, 2026 at 2pm EDT?Yes 13¢No 88¢$1K volWill the temp in Austin be above 92.99° on Jul 21, 2026 at 2pm EDT?Yes 91¢No 9¢$1K volWill the temp in Austin be above 93.99° on Jul 21, 2026 at 2pm EDT?Yes 56¢No 46¢$1K vol
How it worksTurn a market opinion
Turn a market opinion
into tested evidence.
Making money takes more than being right. Use the dashboard or API to find out whether your trade still works after live liquidity, slippage, and fees.
Place the trade
Trade manually or by API with market, limit, stop, and bracket orders.
Measure the edge
See fees, VWAP, slippage, positions, and P&L in one honest record.
Execution that tells the truthA midpoint is a quote.
A midpoint is a quote.
A fill is a journey.
PredArena walks the live book level by level. You see whether the edge survives thin liquidity, price impact, and venue-specific fees.
See exactly how simulation works →LIVE ASK BOOKQUANTITYCOST
54¢80$43.20
53¢120$63.60your order
52¢45$23.40
Naive quote52.0¢
Your real VWAP53.1¢
Impact caught+1.1¢
One arena, two ways inTrade with instinct.
Trade with instinct.
Or ship the system.
A focused interface for curious traders, plus infrastructure for serious automation.
For manual traders
See the market.
Make the call.
Watchlists, quick order tickets, position tracking, and transparent performance—without real capital on the line.
Start trading →For bots & agents
Test the logic.
Prove the edge.
Production-shaped orders, idempotency, webhooks, rich analytics, and isolated portfolios for every strategy.
Read the API docs →POST /api/v2/portfolio/orders
{
"ticker": "KXRT-CRI-90",
"action": "buy",
"yes_no": "yes",
"count": 10
}Simple pricingStart free.
Start free.
Scale when it works.
Every plan includes live market data, realistic paper fills, and a full performance record.
$0/ forever
Learn the product and test a first strategy.
- 1 portfolio
- $1,000 paper balance
- 1,000 orders / month
Most popular
Starter$9/ month
For active traders and early automation.
- 1 portfolio
- $10,000 paper balance
- 25,000 orders / month
$49/ month
Run multiple strategies at serious volume.
- 5 portfolios
- $100,000 paper balance
- 250,000 orders / month
Good questions
Know what you’re trading.
PredArena is intentionally clear about what is real, what is simulated, and where they differ.
Is any real money at risk?+
No. PredArena never routes real-money orders. You trade with paper balances against simulations derived from live public venue data.
Are fills just based on the midpoint?+
No. Market orders walk displayed order-book depth to calculate VWAP and price impact, then apply the venue’s modeled fee schedule.
Can I connect an existing bot?+
Yes. Create a portfolio-scoped API key and route supported order requests to the PredArena REST API. The docs include examples and exact differences from live venues.
Which venues are supported?+
Kalshi and Polymarket are supported for live market discovery, order-book-based simulated fills, and venue-aware fee modeling.
Make your mistakes
beautifully free.
Open a portfolio in seconds. No credit card, no real-money orders, no expensive surprises.
Start paper trading →