Guide · 7 min read
Does arbitrage betting work? What is true and what holds it back
Short answer: the maths works, every time, if its conditions are met. In practice they are not always met, and the bigger limit is not the maths but bookmakers, time and money. Here is the honest version, including why we sell software instead of only betting ourselves.
Updated 22 October 2026
Contents
The maths works, if…
An arbitrage bet (sure bet) exists when the best prices for all outcomes of an event, taken at different bookmakers, add up to an implied probability below 100%. For two outcomes:
Bookmaker A offers Player X at 2.10, Bookmaker B offers Player Y at 2.05. S = 0.4762 + 0.4878 = 0.9640. Split €200 in proportion: €98.80 on X and €101.20 on Y. Whoever wins, you get back about €207.47, roughly €7.47 or 3.7% more than you staked. That is a deliberately large example; most real pre-match sure bets are smaller, around 0.5 to 2%, many below 1%.
That result is arithmetic, not a forecast. It holds if four conditions are met:
- both bets are accepted at the prices you calculated, at full stake;
- both bets cover exactly opposite outcomes of the same event (same line, same period);
- both bets stand and are settled under compatible rules;
- no fee or tax eats the margin, such as a passed-on 5% Wettgebühr in Austria.
Our sure betting guide explains each step. When a sure bet loses money, one of these conditions failed; arbitrage betting mistakes lists the usual ones.
What holds it back in practice
- Account limits. Bookmakers lower the maximum stake of accounts that win consistently, at some bookmakers within weeks, at most within months. This is the hardest ceiling. Researchers who ran a real-money experiment on beating bookmakers' prices reported that accounts were restricted within months (Kaunitz, Zhong and Kreiner, 2017).
- Price changes. Many gaps last minutes. If the price moves between the first and second leg, you either accept a smaller margin or hedge at a small loss.
- Voids and rules. A palpable-error void or a different settlement rule turns a sure bet into a single bet. See voided bets.
- Capital. Your money has to sit at several bookmakers at once and is tied up until bets settle. With a small bankroll the euro amounts are small. See starting bankroll.
- Time. Each bet takes a few minutes of checking and placing, and opportunities appear at all hours. Software shortens the search, not the placing.
Why bookmakers allow it, and still limit
Sure bets exist because bookmakers price thousands of markets, adjust them at different speeds and sometimes shade prices to attract customers. For a moment one of them is out of line with the rest. Betting at several bookmakers and comparing prices is generally legal in Austria, Slovakia and Germany (in Germany only with bookmakers on the official GGL whitelist; in Slovakia only with ÚRHH-licensed operators). See tax and legality.
Legal doesn't mean welcome. A bookmaker earns its margin from customers who bet on what they like. An account that only takes the best price in the market costs it money, so under its terms it may lower your limits, which is a business decision, not a penalty. Our guide to bookmaker limits covers what that looks like.
What would it take?
The useful question is not "how much can I make" but "what would a given amount require". For example: what would €1,000 a month take? At a 1% average margin, about €100,000 in stakes a month: roughly 167 sure bets of €600, more than five a day. Most people never get there, because bookmakers limit winning accounts. Use the calculator with your own numbers.
The more modest version: at 1%, covering a €97 monthly subscription takes about €9,700 in stakes a month. In our model, with €2,000 and two bookmakers with live odds, a typical month leaves about +€33 after the subscription and a cautious month ends below zero. Whether that is realistic for you depends on your bankroll, the bookmakers available in your country and your time. Our side income calculation works through a €3,000 example with its assumptions, including a month after limits. Results vary and can be negative.
Who stops, and why
People who give up usually do so for one of four reasons:
- the bookmakers that create most of their opportunities have limited them, and the rest offer too few;
- one or two voids or mistakes cost more than weeks of margin, and they didn't keep a reserve or hedge;
- the time doesn't fit their life: opportunities come when they are at work or asleep;
- they expected an income, not a routine with small, uneven results.
That is also why we sell software instead of only using it ourselves: it doesn't scale for one person. Bookmakers sometimes limit winning accounts, and it happened to some of our accounts too. One person with a handful of accounts can hit that ceiling within months. Finding the gaps and doing the maths costs us the same for one member or a thousand, and every member bets with their own accounts and their own limits.
How to spot hype
- "Guaranteed", "risk-free" or "sure profit". The maths has conditions, and bets get voided. Anyone who says otherwise is selling, not explaining.
- A fixed monthly income as a headline. Results depend on your capital, your bookmakers, your time and your limits. A number without its assumptions means nothing.
- "Bookmakers can't limit you with our method." Nothing prevents limits.
- Betting through other people's accounts. Using someone else's account breaks bookmaker terms and can cost both of you the balance.
- Paid tips, signal groups or "managed accounts" where someone else bets with your money or your login. Keep control of your own accounts.
- Margins of 10% and more shown as normal. Those are usually errors that will be voided.
Value bets are a different approach with a different risk profile; in ArbVantage they are coming soon. Our value betting guide explains the idea.
Frequently asked questions
Is arbitrage betting legal?
Comparing prices and betting with several bookmakers is generally legal in Austria, Slovakia and Germany. In Germany, bet only with bookmakers on the official GGL whitelist; in Slovakia only with ÚRHH-licensed operators. Bookmakers can still limit your account under their terms. This is general information, not legal advice.
Why do sure bets exist at all?
Bookmakers price thousands of markets and adjust them at different speeds, and some shade prices to attract customers. For a short time one bookmaker's price is out of line with another's, and the combined implied probability drops below 100%.
Why do you sell software instead of betting yourselves?
Because it doesn't scale for one person. Bookmakers sometimes limit winning accounts, and it happened to some of our accounts too. Finding the gaps and doing the maths costs us the same for one member or a thousand, and every member bets with their own accounts and limits.
How long does arbitrage betting work per bookmaker account?
There is no fixed timeline. At some bookmakers stake limits come within weeks, at most within months. Large stakes from day one, niche markets and only ever taking the best price tend to shorten it.
Sources
- Kaunitz, Zhong, Kreiner (2017): Beating the bookies with their own numbers, and how the online sports betting market is rigged
- Unternehmensserviceportal (USP): Wettgebührenabrechnung (in German)
- ÚRHH: legal online gambling and betting websites in Slovakia (in Slovak)
- WKO: Supreme Court ruling, sports betting is not gambling under the GSpG (in German)
As of October 2026, checked against the linked sources. Not legal, tax or betting advice.
Betting involves risk, even with sure bets: prices move, bets get voided and accounts get limited. Only use money you can do without. Our responsible gambling page lists free help.
Not betting advice. 18+. Betting involves risk. See our disclaimer.