Best Prediction Market Arbitrage Tools & Software (2026)

TL;DR

The best prediction market arbitrage tools scan multiple platforms (Polymarket, Kalshi, Opinion) in real-time to find price discrepancies. ArbBets leads the market with 990+ monitored markets, 70-100 daily opportunities, and average 4.87% ROI. Manual arbitrage hunting misses 95% of opportunities because prices move within minutes. Automated tools pay for themselves with a single captured opportunity.

What Makes a Good Arbitrage Tool?

Not all arbitrage finders are equal. Here's what separates useful tools from worthless ones:

1. Multi-Platform Coverage

The tool must scan multiple prediction markets simultaneously. Arbitrage requires price differences between platforms—scanning only one platform is useless.

Essential platforms:

• Polymarket (highest volume)
• Kalshi (US-regulated)
• Opinion (growing alternative)

2. Real-Time Scanning

Prediction market prices move fast. A tool that updates every 5 minutes misses most opportunities. Look for:

• Sub-minute refresh rates
• Live price feeds
• Instant alerts when opportunities appear

3. Accurate Calculations

The tool must correctly:

• Match identical markets across platforms
• Calculate true arbitrage percentage
• Account for fees on each platform
• Show net profit after costs

4. Usable Interface

You need to act fast. The tool should:

• Display opportunities clearly
• Sort by ROI or other criteria
• Link directly to trading pages
• Work on mobile for on-the-go alerts

5. Historical Data

Understanding patterns helps:

• Which markets have frequent arbs
• What times opportunities appear
• How long opportunities last
• Average ROI by market type

Prediction Market Arbitrage Tools Compared

Tool Breakdown

ArbBets — Best Overall

ArbBets is purpose-built for prediction market arbitrage, scanning Polymarket, Kalshi, and Opinion continuously.

Key Features:

• 990+ markets monitored: Covers politics, crypto, sports, entertainment, economics
• Real-time scanning: Prices update continuously, not on delay
• 70-100 daily opportunities: Average 4.87% ROI per opportunity
• Multi-platform: Scans Polymarket, Kalshi, and Opinion simultaneously
• Direct links: One-click access to place trades on each platform
• API access: Build your own automations and alerts

Best For: Serious arbitrage traders who want comprehensive coverage without building their own tools.

Manual Scanning — Budget Option

Open multiple browser tabs and compare prices yourself.

Process:

1. List markets available on multiple platforms
2. Check prices on each platform
3. Calculate if arbitrage exists
4. Execute trades if profitable

Pros:

• Free
• Learn the market mechanics
• Full control over what you monitor

Cons:

• Extremely time-consuming
• Miss 95%+ of opportunities
• Human error in calculations
• Can't scale

Best For: Learning how arbitrage works before investing in tools.

Custom Spreadsheet — DIY Option

Build a Google Sheet or Excel tracker using platform APIs.

Requirements:

• API access to each platform
• Scripting knowledge (Python, Apps Script)
• Ongoing maintenance as APIs change

Pros:

• Customizable to your needs
• One-time setup (theoretically)
• Can add custom alerts

Cons:

• Significant technical skills required
• Hours of setup and maintenance
• APIs change and break your setup
• Slower than purpose-built tools

Best For: Technical users who want custom features and don't mind maintenance.

Feature Deep Dive

Real-Time Scanning

Why speed matters: prediction market arbitrage opportunities last minutes, not hours.

Example timeline:

• 0:00 — Price discrepancy appears
• 0:30 — Alert traders notice
• 1:00 — First trades placed
• 2:00 — Prices converge, opportunity gone

A tool checking prices every 5 minutes misses most opportunities. Real-time scanning is essential.

Multi-Platform Coverage

Single-platform tools can't find arbitrage. You need simultaneous coverage of:

The more platforms covered, the more opportunities found.

API Access

Advanced users can build automations with API access:

• Custom alerts (Slack, Discord, SMS)
• Automated position sizing
• Integration with trading bots
• Historical analysis and backtesting

ArbBets provides API access for users who want to extend functionality.

Pricing Comparison

The math: If a tool subscription costs $50/month and average opportunities yield 5% on $500 trades ($25 profit), you break even capturing 2 opportunities. Most users capture 10-30+ monthly.

Getting Started with Arbitrage Tools

Step 1: Set Up Platform Accounts

Before using any tool, you need funded accounts on:

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

Keep funds ready on all platforms—you can't capture opportunities if you can't trade.

Step 2: Choose Your Tool

Beginners: Start with manual scanning to learn the mechanics. Spend a week understanding how prices differ between platforms.

Intermediate: Graduate to ArbBets or similar tools once you understand the basics and want to scale.

Advanced: Use API access to build custom alerts and potentially automated execution.

Step 3: Start Small

Begin with small position sizes ($50-100 per trade) until you're comfortable with:

• Execution speed
• Platform interfaces
• Fee calculations
• Settlement timing

Step 4: Scale Up

Once confident:

• Increase position sizes
• Capture more opportunities daily
• Track your results
• Optimize your process

Common Questions

Do I need to pay for tools?

Not necessarily, but paid tools find 10-20x more opportunities than manual scanning. If your time is worth anything, tools pay for themselves quickly.

Can tools automatically place trades?

Most tools find and alert—you place trades manually. Fully automated trading requires custom development and carries execution risk.

What's the learning curve?

Basic arbitrage concepts take an hour to understand. Using tools like ArbBets takes minutes to learn. The complexity is in execution speed and position management.

Do tools guarantee profits?

Tools find opportunities—you must execute correctly. A 5% opportunity becomes 0% if you're too slow or make errors. Tools increase your chances but don't eliminate execution risk.

How do I know if an opportunity is real?

Good tools verify market matching and calculate accurate percentages. Always double-check the first few times:

1. Confirm markets are for the same event
2. Verify prices shown match platform prices
3. Calculate the arb percentage yourself

Choosing the Right Tool

Start Finding Opportunities

The prediction market arbitrage space is growing as platforms like Polymarket, Kalshi, and Opinion expand. More markets mean more price discrepancies and more opportunities.

Manual scanning worked when there were 50 markets to track. With 990+ markets today, automated tools aren't optional—they're essential for capturing meaningful profits.