Explainer · 6 min read

Is arbitrage betting ethical? Where the lines really are

Some people feel sure bets must be a trick: if it works, someone is being cheated. Bookmakers dislike arbers and some forums call them abusers. This guide separates the questions: is it cheating, what may bookmakers do about it, and where are the real lines between arbing, bonus abuse, multi-accounting and betting fraud. It also explains where ArbVantage itself draws lines.

Updated 22 October 2026

Contents

Why sure bets aren't cheating
What bookmakers may do
Five practices compared
Pricing errors (palps)
Where ArbVantage draws lines
A simple test
FAQ
Sources

Why sure bets aren't cheating

A sure bet uses prices that bookmakers publish for everyone. Bookmaker A thinks a player's chances are a bit lower than bookmaker B does, and each sets its price accordingly. If you bet one side at A and the other at B, you have accepted two public offers. Nobody is misled about who you are, what the event is or what the odds are.

Worked example

Bookmaker A offers 2.05 on player 1, bookmaker B offers 2.05 on player 2. €100 on each returns €205 whatever happens: +€5 on €200, if both bets are accepted at those odds and stand.

Each bookmaker still has its own margin on its own book. A loses €105 if player 1 wins, B loses €105 if player 2 wins, and each keeps the stakes of all its other customers. You simply took the best price on each side.

Comparing prices is normal in every other market: nobody calls it cheating to buy milk at the cheaper supermarket. Economically, sure bets exist because bookmakers set prices independently and some react more slowly than others. Is arbitrage betting gambling? explains the mechanics further.

It also doesn't harm other bettors. The price you took was on offer to anyone; there is no victim on the other side of the trade.

What bookmakers may do: limits and terms

That arbing isn't cheating doesn't mean bookmakers have to like it. They are businesses that decide whom they serve, and their terms usually allow them to:

limit stakes on an account, sometimes to a few euros (see bookmaker limits);
close an account and pay out the balance;
exclude customers from promotions;
void bets at obvious pricing errors under their betting rules.

Some terms go further and name "arbitrage betting" as grounds for voiding bets. Whether such clauses hold up is a question of consumer law: under EU rules (Directive 93/13/EEC) and national law, unfair terms in consumer contracts can be invalid, especially if they allow a bookmaker to keep the stakes on losing bets while voiding winning ones. Whether a specific clause is fair is for a court or regulator to decide, not for us. Read what to look for in bookmaker terms to check.

The practical consequence: arbing is legitimate, but accounts don't last for ever. Plan with that in mind.

Where the lines are: five practices compared

Very different things are often lumped together. This table separates them:

Practice	What happens	Assessment
Sure bets	You bet all outcomes at public prices with your own accounts.	Legal; bookmakers may limit.
Covering free bets (matched betting)	You use an offer the bookmaker made you and cover it with an opposing bet.	Legal; follow the bonus terms, the bonus can be withdrawn.
Bonus abuse with multiple accounts	A one-per-person bonus is claimed several times through extra accounts or false details.	Breaks the terms; winnings can be withheld; with false details possibly criminal.
Betting on someone else's account	You bet through a friend's account or buy an account.	Breaks the terms; depending on the case fraud or a money-laundering issue.
Match fixing, insider information	The result is manipulated or non-public knowledge is used.	A criminal offence and unfair to everyone involved.

The difference isn't in the maths but in deception. With a sure bet the bookmaker knows who it is dealing with and decides freely. With multiple accounts, other people's accounts or manipulation it is deceived about the person or the event. More in bonus abuse explained and betting on someone else's account.

A special case: pricing errors (palps)

Sometimes a sure bet only looks great because a bookmaker made a mistake: 21.0 instead of 2.10, swapped markets, or a price that hasn't been updated for hours. Such obvious errors are called palps (palpable errors). Almost every bookmaker reserves the right in its rules to void bets at obviously wrong odds or settle them at the correct price.

Morally this is a grey area; practically it is mainly a risk. If one leg of a sure bet is voided, the other stays as an ordinary bet that can lose. See voided bets and palpable errors. That is why our software marks sure bets above 15% as "check carefully", ranks them after normal ones, and drops anything above 30% as implausible.

Where ArbVantage draws lines

We sell software that finds price differences and works out stakes. That determines what we support and what we don't:

Your own accounts only. You add the bookmakers where you personally hold an account, and you only see sure bets for those. We don't help with opening multiple accounts, betting through other people's accounts or getting around country blocks.
No disguise promises. Rounded stakes and mainstream markets are normal betting habits, and the app can round stakes. That doesn't prevent limits, and we don't claim it does.
Licence status shown, not hidden. Bookmakers without a licence in your country are flagged neutrally so you can decide for yourself.
Friends instead of other people's accounts. If you want to show friends how sure bets work, you can invite them; they then use their own accounts at their own risk.
No promises. We don't say you will win with us. You decide and place every bet yourself, 18+ and at your own risk.

How the engine checks prices is described in our methodology.

A simple test

If you're unsure whether something is still fair, ask one question: would the bookmaker know exactly who is betting and on what? If yes, you are on the right side of the line, even if the bookmaker later decides to limit you. If you would have to deceive someone to do it, don't.

If that sounds like the way you want to approach it, you can try ArbVantage for 14 days with your own accounts.

Frequently asked questions

Is arbitrage betting cheating?

No. You bet with your own account at prices the bookmaker publishes for everyone, and the bookmaker accepts each bet freely. Nobody is deceived about who is betting or what the event is.

Is arbitrage betting illegal?

Not as such, including in Austria and Slovakia. Bookmakers can still limit or close accounts under their terms, and you have to follow tax rules and the bookmaker's rules on identity and one account per person.

What is the difference between arbing and bonus abuse?

Arbing uses price differences on your own account. Bonus abuse means claiming a one-per-person offer several times, for example through extra accounts or false details, which breaks the terms and can lead to winnings being withheld.

Can a bookmaker keep my money for arbing?

A bookmaker may limit stakes, close an account and void bets at obvious pricing errors under its rules. Withholding a legitimate balance purely for arbing is a different matter: complain to the bookmaker first, then to its licensing authority or an alternative dispute resolution body.

Sources

As of October 2026. General information, not legal advice; whether a specific term is valid depends on the case.

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.