Betting Exchange

How It Works

A betting exchange acts as a marketplace connecting bettors with opposing views. Instead of a bookmaker setting odds and taking the other side, users set their own odds and wait for someone to match them. The exchange takes a small commission (2-5%) on winning bets rather than building a margin into the odds.

This creates two roles:

• Backers, Bet that an outcome will happen (like a traditional bet)
• Layers, Bet that an outcome won’t happen (acting as the bookmaker)

Practical Example

On Betfair Exchange for a tennis match:

• You want to back Djokovic at 1.80 for $200
• Another user wants to lay Djokovic at 1.80 for $200

The exchange matches you. If Djokovic wins:

• You (backer) profit: $160 minus 2% commission = $156.80
• Layer loses: $160

If Djokovic loses:

• Layer profits: $200 minus 2% commission = $196
• You (backer) lose: $200

The exchange earns commission from the winner regardless of outcome.

Why It Matters for Bettors

Exchanges offer several advantages over traditional sportsbooks:

• Better odds, No bookmaker margin means odds are typically 10-20% better than sportsbooks
• Lay betting, The ability to bet against outcomes enables matched betting, trading, and hedging strategies
• No account limits, Exchanges don’t restrict winning bettors since they profit from commission, not losses
• In-play trading, Back and lay at different prices to lock in profit as odds move during events

Exchange vs. Sportsbook

	Exchange	Sportsbook
Odds set by	Users	Bookmaker
Revenue model	Commission on wins	Built-in margin (vig)
Lay betting	Yes	No
Account limits	No	Yes (for winners)
Typical odds	Better by 10-20%	Worse due to vig

Major Betting Exchanges

• Betfair Exchange, World’s largest, deepest liquidity across all sports
• Smarkets, 2% commission, clean interface, growing market depth
• Betdaq, Established alternative, popular in UK/Ireland
• Prophet Exchange, US-based exchange, currently available in New Jersey
• Sporttrade, US exchange with a trading-focused interface