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Arbitrage betting vs matched betting: what's the difference?
Price gaps versus promos: how each method works in the US, with worked numbers for an arb and a bonus bet
Arbitrage betting profits from price gaps between sportsbooks and needs no promo; matched betting turns sportsbook promos into cash and accepts small qualifying costs. Here is how each works, with worked numbers, and which one gets accounts limited faster.
By NinjaBet Editorial Team 6 min read
Arbitrage betting (arbs) uses no promo: it profits from price gaps between sportsbooks, when the best odds on every outcome add up to a hold below zero. Matched betting uses promos such as bonus bets and profit boosts, and accepts small qualifying costs to unlock them. Both hedge every outcome. Arbs are rarer, smaller and draw limits faster; matched betting depends on how many promos your state's sportsbooks offer.
What is arbitrage betting?
Every sportsbook builds a margin, called the hold or vig, into its prices. On a two-way market at -110 / -110 the implied probabilities add up to 104.76%, a hold of 4.76%. Sportsbooks set their lines independently, though, and for a few minutes the best price on one side at one sportsbook and the best price on the other side at another can add up to less than 100%. That is a negative hold, and betting both sides in the right proportion returns the same profit whoever wins. That pair of bets is an arb.
The SureBet tool scans the sportsbooks in your state for these pairs, and the SureBet calculator splits your stake. The free no-vig calculator shows the hold of any pair of prices.
What is matched betting?
Matched betting starts from a promo. You place the bet the promo requires at one sportsbook and hedge the other outcome at a second sportsbook or on ProphetX, a prediction market, so the result is locked in whoever wins. The qualifying bet usually costs a little, because normal prices carry a positive hold. The value comes from the reward: a bonus bet, a second chance bet, a profit boost or site credit. The Bet Finder finds the pair of prices that keeps the most of each promo.
How does an arb work, in numbers?
For example, in October 2026 Sportsbook A prices Team X at +115 (2.15 in decimal) and Sportsbook B prices Team Y, the only other outcome, at -105 (1.9524). The implied probabilities are 1 ÷ 2.15 = 46.51% and 1 ÷ 1.9524 = 51.22%, which add up to 97.73%: a hold of -2.27%.
| Leg | Odds | Stake | Total return if it wins | Profit on $500 |
|---|---|---|---|---|
| Team X at Sportsbook A | +115 (2.15) | $237.96 | $511.61 | +$11.61 |
| Team Y at Sportsbook B | -105 (1.9524) | $262.04 | $511.60 | +$11.60 |
How the stakes are found: each leg gets the total stake in proportion to its implied probability. Stake A = $500 × (1 ÷ 2.15) ÷ 0.97731 = $237.96, and stake B = $500 - $237.96 = $262.04. Then $237.96 × 2.15 = $511.61 and $262.04 × 1.95238 = $511.60, so you make about $11.60 whoever wins, a margin of 2.32% on the $500 staked (100 ÷ 97.73 - 1).
That margin exists only while both prices stand. If one moves before your second bet is placed, the arb can turn into a small loss, which is why arbers bet quickly, and why that speed is a pattern sportsbooks notice.
How does matched betting work, in numbers?
For example, you hold a $100 bonus bet. You place it at +400 (5.00) and hedge the other side at -450 (1.2222) at another sportsbook. A bonus bet returns only the winnings, so the hedge stake is $100 × (5.00 - 1) ÷ 1.2222 = $327.27.
- If the bonus bet wins: $400.00 profit - $327.27 hedge = +$72.73.
- If the hedge wins: $327.27 × (100 ÷ 450) = +$72.73, and the bonus bet cost you nothing.
You keep $72.73 of the $100 bonus bet, a conversion rate of about 73%. To earn it you usually need a qualifying bet first. For example, a $100 qualifying bet at -110 hedged at +100 needs $100 × 1.90909 ÷ 2.00 = $95.45 on the other side, and costs $4.54 or $4.55 depending on who wins. The free bonus bet converter and the matched betting calculator run these numbers for any prices.
Arbitrage betting vs matched betting: side by side
| Arbitrage betting | Matched betting | |
|---|---|---|
| Source of the profit | Price gaps between sportsbooks | Sportsbook promos |
| Needs a promo | No | Yes |
| Hold of the pair | Below zero | Usually a little above zero; the promo pays for it |
| Typical result (examples above) | +$11.60 on $500 staked | +$72.73 from a $100 bonus bet, after a qualifying cost of about $4.55 |
| How long the chance lasts | Minutes, until a price moves | Until the promo expires, usually days |
| Risk of limits | Higher: arbs hit soft prices quickly | Lower, but promo-only accounts do get limited |
| NinjaBet tool | SureBet | Bet Finder |
Which one should you start with?
For most people in the US, matched betting. Welcome offers and recurring promos are worth far more per bet than a typical arb, the chances last long enough to place both bets calmly, and the qualifying costs are small and known in advance. Arbs need a larger bankroll spread across many sportsbooks, fast execution and a tolerance for prices that move under you.
Many matched bettors use arbs as a complement: an arb can serve as a qualifying bet at no cost, or a sportsbook that has stopped sending promos can still be used for arbs until it limits stakes. Keep in mind that arbing tends to shorten an account's life, and the promos you lose with it are usually worth more than the arbs. How do you avoid getting limited by sportsbooks? covers the habits that may help. Everything here is an estimate rather than a promise: results depend on the prices you get and the promos available in your state.
Frequently asked questions
Is arbitrage betting legal in the US?
Betting both sides at licensed sportsbooks is legal where sports betting is legal, but sportsbooks can limit or close accounts under their terms. See Is matched betting legal in the US?
Why do arbs get limited faster?
Because they target the prices a sportsbook has set wrong, and the bets come in right after a line moves elsewhere. Risk teams look for exactly that pattern.
Can a qualifying bet be an arb?
Yes, if a pair with a negative hold meets the promo's requirements, such as minimum odds. Then the qualifying bet costs nothing or makes a little.
What does a hold below zero mean?
The implied probabilities of the best prices add up to less than 100%. With -2.27%, betting both sides correctly returns 2.32% on the total staked.
Do I need ProphetX for arbs?
No. An arb can use any two sportsbooks in your state; ProphetX is one more place to find the best price on a side.
Sources
- NinjaBet tools: SureBet, SureBet calculator, Bet Finder, matched betting calculator.
- NinjaBet free calculators: no-vig calculator, bonus bet converter.
- NinjaBet: Matched betting in the US.
You must be 21 or older (18 in a few states) to bet in the United States, and bet only with operators licensed in your state. Gambling can be addictive: if you or someone you know has a gambling problem, call or text 1-800-GAMBLER, or the National Problem Gambling Helpline at 1-800-MY-RESET (ncpgambling.org), free and confidential, 24/7. Results vary and require time and capital; this article is information, not financial or legal advice. Last updated: October 12, 2026.
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