How do you make money on prediction markets?

Prediction-market traders make money only when their forecasting edge is greater than execution costs, fees, slippage, and mistakes. PredArena helps people, bots, and AI agents test that edge against live Kalshi and Polymarket order books before real capital is at risk. Testing improves evidence and discipline, but does not guarantee profits.

Why should you test prediction market trades before using real money?

A trade that looks profitable at the midpoint can lose its edge after thin liquidity, price impact, venue fees, poor sizing, or software errors. Paper testing reveals those problems before they cost real money.

Is PredArena real-money trading?

No. PredArena uses paper money and never routes real-money orders. It references live public venue order books to model fills.

Where does PredArena get market data?

PredArena queries live Kalshi and Polymarket market data and walks displayed order-book liquidity when a simulated trade is placed.

Can trading bots use PredArena?

Yes. Bots and agents can place market, limit, stop, take-profit, and bracket orders through PredArena's REST API.

Live Kalshi + Polymarket data

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.

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Explore live markets

Free to startNo card$1,000 paper balance

Live market workspace Synced

Portfolio value$1,248.60

+$248.60 · +24.9%

kalshiView market ↗

Over 189.5 points scored

YES49¢NO52¢BOOK DEPTH12 levels

Paper moneyReal order booksVenue fees included

Live data from

Supported venues

Your funds never leave your wallet.

Live markets

How it works

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.

Find your market

Search active Kalshi and Polymarket events in one fast, unified feed.

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 truth

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 →

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 in

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 pricing

Start free.
Scale when it works.

Every plan includes live market data, realistic paper fills, and a full performance record.

Free

$0/ forever

Learn the product and test a first strategy.

1 portfolio
$1,000 paper balance
1,000 orders / month

Start free

$9/ month

For active traders and early automation.

1 portfolio
$10,000 paper balance
25,000 orders / month

Choose Starter

Pro

$49/ month

Run multiple strategies at serious volume.

5 portfolios
$100,000 paper balance
250,000 orders / month

Choose Pro

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.

Ready when you are

Make your mistakes
beautifully free.

Open a portfolio in seconds. No credit card, no real-money orders, no expensive surprises.

Start paper trading →

Practice on live markets. Risk nothing.

Over 189.5 points scored

Turn a market opinioninto tested evidence.