What is Sports Arbitrage?

Same event, different prices on two platforms. Buy both sides for less than the payout and profit no matter who wins. Titan finds these in real-time.

A Simple Example

Imagine the Lakers are playing the Celtics tonight. Two prediction markets price the game differently:

Polymarket

Lakers YES

47c

Kalshi

Lakers NO

48c

You buy "Lakers YES" on Polymarket for 47c and "Lakers NO" on Kalshi for 48c.

Total cost: 95c. One of these contracts will pay out $1.00. No matter who wins, you make 5c profit per contract.

Guaranteed 5.3% return, regardless of outcome

The Platforms

Polymarket

Crypto-based prediction market. Buy shares from 0c to $1.00 on real-world outcomes. Pays $1.00 if you're right, $0 if wrong.

Kalshi

CFTC-regulated US prediction market. Same concept, USD-based. Different users and liquidity means the same event can be priced differently — that's where arbitrage appears.

How Titan Finds Opportunities

When buying both sides across platforms costs less than $1.00, that's an opportunity. Here's how Titan catches them:

Scan

Titan checks prices across platforms every few seconds. When prices diverge, it flags the opportunity.

Calculate

It computes the exact profit after fees and slippage. Only opportunities with real profit are shown.

Alert

Live opportunities appear on the Titan dashboard with profit percentage, cost, and direct links to both platforms.

Why Opportunities Disappear

Traders exploit price gaps fast. As they buy the cheap side and sell the expensive side, prices converge within minutes.

12:00 PM

5.3%

12:02 PM

3.1%

12:05 PM

0.0%

Polymarket price

Kalshi price

In this example, the 5.3% opportunity closed within 5 minutes as prices converged. Speed matters.

What to Know Before You Start

Time-sensitive

Windows last 2-10 minutes. Titan shows real-time data, but execution speed is on you.

Contract availability

Only events listed on both platforms can have arbitrage. That's a fraction of all events.

Fees included

Platforms charge 1-2%. Titan's profit numbers already account for estimated fees.

Information only

Titan shows opportunities. It doesn't execute trades. You need accounts on Polymarket and/or Kalshi.

Frequently Asked Questions

What is sports arbitrage betting?▾

Sports arbitrage betting is a strategy where you place bets on all possible outcomes of an event across different platforms, guaranteeing a profit regardless of the result. It works because different prediction markets and sportsbooks sometimes disagree on the probability of an event, creating a price gap you can exploit.

How does cross-platform arbitrage work with Polymarket and Kalshi?▾

Polymarket and Kalshi are prediction markets where you buy contracts that pay $1.00 if an outcome occurs. When the same event is priced differently on each platform — for example, "Lakers YES" at 47c on Polymarket and "Lakers NO" at 48c on Kalshi — you can buy both sides for 95c total and guarantee a $1.00 payout, netting a 5.3% risk-free return.

Is sports arbitrage betting risk-free?▾

The math is risk-free — if you execute both sides at the quoted prices, you're guaranteed a profit. However, real-world risks include execution speed (prices move fast), platform fees (1-2% per trade), and liquidity (you may not get filled at the exact price shown). Titan accounts for estimated fees in its profit calculations.

How long do arbitrage opportunities last?▾

Most sports arbitrage opportunities last 2-10 minutes before prices converge. As traders exploit the price gap, they push prices on both platforms toward equilibrium. Speed of execution is critical — which is why Titan scans prices in real-time and alerts you the moment an opportunity appears.

What is Titan?▾

Titan is an arbitrage scanner built by Trendline Labs that monitors Polymarket and Kalshi in real-time. It compares contract prices across platforms, calculates profit after fees, and surfaces live opportunities on a dashboard. Titan is an information tool — it does not execute trades for you.

Ready to see live opportunities?

Open Titan