Understanding Betting Markets: Moneyline, Spread, and Totals Explained
Before you can spot a price gap between bookmakers, you need to know you're comparing the same market. Here's a plain-language rundown of the market types that show up most in arbitrage betting.
What are the main types of betting markets?
The three most common market types across most sports are moneyline (betting on who wins outright), spread or handicap (betting on the margin of victory, adjusted so both sides look roughly equally likely), and totals or over/under (betting on whether the combined score goes above or below a set number). Most other market types are variations built on these three core ideas.
Why Market Type Matters for Arbitrage
Arbitrage only works if you're combining odds for the exact same market definition across bookmakers. Backing one bookmaker's moneyline and another's spread on the same game isn't arbitrage, it's two unrelated bets that happen to be on the same event. Understanding what each market actually represents is the first step to making sure you're comparing genuinely equivalent odds.
This matters more in sports like ice hockey and basketball, where market naming and structure vary more between bookmakers than in football, which is a large part of why searches for terms like 'ice hockey betting markets' and 'basketball betting markets' are common, people are trying to understand what they're actually looking at before comparing prices.
Moneyline: Betting on Who Wins
A moneyline bet is the simplest market type: you're betting on which side wins the game outright, with no point margin involved. In sports with draws as a possible outcome, like football, this becomes a three-way market (home win, draw, away win) rather than a straightforward two-way one.
Moneyline markets are usually the most heavily bet and most closely priced across bookmakers, since they're the most straightforward market to understand and compare, which also means arbitrage margins here tend to be thinner than in less-trafficked markets.
Spread or Handicap: Betting on the Margin
A spread (also called a handicap) market adjusts for a expected difference in team strength by adding or subtracting points from the final score before determining the winner of the bet. If a strong team is favored by 7 points, betting on them 'to cover the spread' means they need to win by more than 7 points, not just win outright.
This market type is especially common in basketball and American football, where final scores tend to be higher and more variable, making a straight moneyline bet on a heavy favorite less interesting to bet on for value compared to a spread bet.
Totals (Over/Under): Betting on Combined Score
A totals bet, often called an over/under, is a wager on whether the combined score of both teams will be above or below a number set by the bookmaker, regardless of who wins the game. This market type doesn't require you to pick a side at all, just whether the overall scoring will be higher or lower than the set line.
Totals markets appear across nearly every sport, though the scoring patterns that make them interesting vary a lot, a hockey totals line behaves very differently from a basketball one given how differently those sports tend to score.
Matching Market Definitions Across Bookmakers
Before combining odds from two bookmakers into an arbitrage calculation, confirm they're using the same market definition, not just a similarly named one. A common trap is 'draw no bet' looking similar to a standard moneyline market but actually excluding the draw outcome entirely, which will silently break your arbitrage math if you mix the two.
Spread and totals markets need even closer attention, since the specific number (the spread points or the totals line) has to match exactly between bookmakers for the arbitrage to hold, a 7-point spread at one bookmaker and a 6.5-point spread at another aren't the same market, even though they look similar at a glance.
Frequently asked
What's the difference between a moneyline and a spread bet?
A moneyline bet is on who wins outright, with no adjustment for margin of victory. A spread bet adjusts for the expected margin, so the favorite needs to win by more than the spread, not just win the game.
Can I arbitrage a moneyline market against a spread market?
No, they're different markets with different outcomes, so combining them doesn't produce a valid arbitrage. Both sides of an arbitrage bet need to reference the exact same market definition.
Why do spread and totals lines need to match exactly between bookmakers?
Because the specific number defines the market. A 7-point spread and a 6.5-point spread are different bets with different possible outcomes, even though they look similar, so mixing them breaks the arbitrage calculation.
Which market type usually has the widest arbitrage margins?
It varies, but less heavily-trafficked markets, often spread and totals markets outside major leagues, tend to see wider price disagreements than the most heavily bet moneyline markets on popular events.
Does every sport use all three market types?
Most sports offer some version of all three, but which one dominates betting activity varies. Moneyline tends to dominate in football and tennis, while spread and totals are especially prominent in basketball and American football.