Prediction Market Arbitrage: Where to Find Arbs in 2026 (Guide)

TL;DR

Prediction market arbitrage exploits price differences between platforms like Polymarket, Kalshi, and Opinion. When the same event trades at different prices, you can bet both sides to guarantee profit regardless of outcome. Example: Venezuela leadership change offers 5.26% ROI by buying No on Kalshi (89¢) and Yes on Polymarket (6¢) for a total cost of 95¢ with guaranteed $1 payout. ArbBets scans 990+ markets daily to find these opportunities automatically.

Last updated: August 4, 2026

What is prediction market arbitrage?

Prediction market arbitrage is buying complementary YES/NO contracts across two or more platforms so your total cost is less than the $1.00 guaranteed payout. You profit regardless of which outcome occurs — you are exploiting mispricing, not forecasting.

• Risk-free when executed — profit locks in once both legs fill at expected prices
• Fee-sensitive — Kalshi taker fees can erase thin spreads; always calculate net ROI
• Time-sensitive — windows often last 2–6 hours; volatile events close in minutes

Primary scanner: arbitrage bet finder · Live hub: prediction markets arbitrage.

Where do I find good arbitrage bets?

Good arbitrage bets appear where the same real-world event is listed on multiple platforms with different implied probabilities. In 2026, the highest-yield corridor is Polymarket ↔ Kalshi; Opinion adds a third leg when the primary pair is tight.

Manual tab comparison works for learning but misses 95%+ of opportunities. Use a Kalshi arbitrage calculator to size any spread you spot by hand.

Categories with frequent arbs

• Politics — elections, cabinet appointments, international leadership
• Macro — Fed rate decisions, CPI prints, GDP releases
• Crypto — token launch dates, ETF approvals, price milestones
• Sports-adjacent — championship winners listed on both Kalshi and Polymarket

Tool comparison: best prediction market arbitrage tools (2026).

Why Do Price Differences Exist?

Different prediction markets attract different traders with different information:

• Geographic differences: Kalshi is US-only while Polymarket serves international traders
• User base: Crypto-native traders on Polymarket vs traditional finance users on Kalshi
• Liquidity: Smaller platforms adjust prices slower
• Information flow: News reaches different platforms at different speeds
• Market structure: Different fee structures and position limits create pricing inefficiencies

These factors create persistent arbitrage opportunities averaging 4-7% ROI.

How Prediction Market Arbitrage Works

The Basic Math

Prediction markets sell contracts priced between $0 and $1. A contract pays $1 if the event happens, $0 if it doesn't.

For every event, there's a Yes contract and a No contract. In an efficient market:

• Yes price + No price = $1.00

But when prices differ between platforms:

• Platform A: Yes = 60¢, No = 40¢ (total: $1.00)
• Platform B: Yes = 55¢, No = 45¢ (total: $1.00)

You can buy Yes on Platform B (55¢) and No on Platform A (40¢):

• Total cost: 55¢ + 40¢ = 95¢
• Guaranteed payout: $1.00 (one contract always wins)
• Profit: 5¢ = 5.26% ROI

Real Example: Venezuela Leadership Change

Arbitrage Trade:

• Buy "No" on Kalshi: 89¢
• Buy "Yes" on Polymarket: 6¢
• Total cost: 95¢
• Payout: $1.00 guaranteed
• Profit: 5¢ per contract = 5.26% ROI

If Maduro leaves, your Polymarket Yes pays $1. If he stays, your Kalshi No pays $1. You profit either way. Size similar trades with the Kalshi arbitrage calculator.

Step-by-Step Arbitrage Process

Step 1: Set Up Accounts

Create and fund accounts on multiple platforms:

• Polymarket: Requires crypto wallet with USDC
• Kalshi: Bank transfer or debit card (US only)
• Opinion: Similar to Polymarket, crypto-based

Keep funds ready on all platforms—arbitrage opportunities disappear quickly.

Step 2: Find Opportunities

Scan markets for price discrepancies. For each event:

1. Find the same market on multiple platforms
2. Add the cheapest Yes price + cheapest No price
3. If total < $1.00, arbitrage exists
4. Calculate ROI: (($1 - total) / total) × 100

Manual scanning is slow—use the arbitrage bet finder or prediction markets arbitrage hub to automate this.

Step 3: Calculate Position Sizes

To maximize profit, bet proportionally:

If Yes costs 40¢ and No costs 55¢:

• Total cost: 95¢ for $1 payout
• Bet equal dollar amounts: $100 on each side
• Total investment: $200
• Contracts owned: 250 Yes + 182 No
• Guaranteed profit: ~$10.50 (5.26% of $200)

See the arbitrage betting calculator guide for Kalshi fee adjustments.

Step 4: Execute Quickly

1. Open both platforms simultaneously
2. Place the less liquid trade first (usually Kalshi)
3. Immediately place the second trade
4. Verify both orders filled at expected prices

Step 5: Wait for Settlement

Once both trades execute, your profit is locked. Wait for the event to resolve and collect your payout.

Platforms for Prediction Market Arbitrage

Polymarket

• Type: Decentralized, crypto-based
• Access: International (US restricted)
• Fees: 0% trading fees
• Liquidity: Highest volume
• Markets: 1,000+ (politics, crypto, sports, entertainment)

Kalshi

• Type: CFTC-regulated exchange
• Access: US only (fully legal)
• Fees: 0-1% per trade
• Liquidity: Medium
• Markets: 500+ (events, economics, politics)

Opinion

• Type: Newer platform, crypto-based
• Access: International
• Fees: 0%
• Liquidity: Growing
• Markets: 200+ (often different pricing from Polymarket)

For a detailed comparison, see our Polymarket vs Kalshi guide.

Risk vs Reward Analysis

Expected Returns

Based on ArbBets data across 990+ markets

Common Mistakes to Avoid

1. Not Accounting for Fees

Kalshi charges 0-1% per trade. A 3% arb becomes 1% after fees. Always calculate net profit.

2. Slow Execution

Prices move fast. If you take 2 minutes between trades, the opportunity may vanish. Have both platforms open and ready.

3. Ignoring Liquidity

Order books matter. A $10,000 arb means nothing if only $500 of liquidity exists. Check depth before trading.

4. Wrong Contract Matching

Ensure you're trading the exact same event. "Trump wins 2024" vs "Trump wins popular vote" are different markets.

5. Forgetting About Settlement Time

Your capital is locked until the event resolves. A 5% arb on a 2028 election ties up funds for years.

6. Overleveraging

Don't put all funds in one arb. Spread across multiple opportunities to manage platform and execution risk.

Tools for Finding Arbitrage

Manual Method

1. Open multiple platforms in browser tabs
2. Compare prices for matching markets
3. Calculate arb percentage
4. Execute trades

Pros: Free Cons: Time-consuming, miss most opportunities, prone to errors

Arbitrage Finder Tools

Automated scanners like the arbitrage bet finder continuously monitor all markets and alert you to opportunities.

Pros: Find 100+ opportunities daily, real-time alerts, accurate calculations Cons: Subscription cost for full features

API and Bots

Build custom workflows with the arbitrage betting API and developer docs.

Pros: Customizable, automatable Cons: Requires technical skills, Premium plan for hosted data

Frequently Asked Questions

How much can I make with prediction market arbitrage?

Returns depend on capital and opportunity frequency. With $5,000 across platforms, expect $150-350/month capturing available opportunities. Returns scale with bankroll.

Is this the same as sports betting arbitrage?

Similar concept, different markets. Prediction markets cover politics, economics, and events beyond sports. The math is identical—exploit price differences for guaranteed profit.

Do I need to predict outcomes correctly?

No. That's the beauty of arbitrage—you profit regardless of what happens. You're exploiting pricing inefficiency, not making predictions.

What's the minimum to start?

You can start with $200-500 split across platforms. Smaller bankrolls limit which opportunities you can capture profitably after fees.

How long until I see profits?

Profits are instant once trades execute, but funds stay locked until event resolution. Political markets may take months; Fed decisions resolve within days.

Will platforms ban me for arbitrage?

Prediction markets generally welcome arbitrage traders—you're providing liquidity and price discovery. Unlike sportsbooks, they don't limit winning accounts.

Related Reading

• Arbitrage bet finder — primary tool page
• How arbitrage bet finders work — tutorial
• Best prediction market arbitrage tools
• Prediction Market Arbitrage Report 2026 — Kalshi vs Polymarket original data
• Kalshi arbitrage calculator
• Arbitrage betting API
• Pricing

Start Finding Arbitrage Today

Manual hunting is inefficient. By the time you find an opportunity, it's often gone. ArbBets scans 990+ markets across Polymarket, Kalshi, and Opinion in real-time, delivering actionable opportunities to your dashboard.