Is Arbitrage Betting Legal? US, UK, Canada, Australia (2026)

Short answer

Arbitrage betting is a way of betting, not a legal category: the statutes and regulator pages cited below don't mention it by name. What they regulate is gambling itself — who may offer bets, to whom and with what licence — so whether placing a surebet is allowed depends on where you are and on the operator's licence. What operators can do is restrict or close accounts under their own terms, and regulators say so openly: Great Britain's Gambling Commission, citing the Gambling White Paper, writes that operators "are entitled to act in their commercial interests and manage liabilities." This page is not legal advice; the sources for each claim — laws, regulators and the operators' own terms — are listed at the end, checked on November 6, 2026.

Our own data shows why the practical questions are speed and the operators' rules rather than the law: over 30 days, from October 6 to November 5, 2026, Dozor recorded 4,829,879 surebet episodes (1,397,673 distinct surebets), and only 3.9% lasted longer than a minute. A surebet is a short-lived price gap between two operators; each of them decides on its own whether to accept the bet.

United States

• States decide. In Murphy v. NCAA (2018) the Supreme Court struck down the federal ban on states authorizing sports betting: "Congress can regulate sports gambling directly, but if it elects not to do so, each State is free to act on its own." Whether sports betting is offered where you are, and by whom, is a question for your state's law and gaming regulator.
• States let operators limit bettors. An example: Massachusetts' sports wagering rules say they do not preclude an operator "from establishing its own minimum or maximum wagers or limiting a patron's Sports Wager for reasons considered necessary or appropriate by the Sports Wagering Operator" (205 CMR 247.08(1), as amended through April 24, 2026).
• Kalshi is a federally regulated prediction market. The CFTC designated KalshiEX LLC a designated contract market in November 2020, and Kalshi's help center states it "is regulated as a Designated Contract Market (DCM)". Who may trade is set by the Kalshi Member Agreement: its list of restricted jurisdictions includes the United Kingdom, Canada and Australia (section VI, version of October 1, 2026), and Kalshi "reserves the right, in its sole and absolute discretion, to grant, deny, condition, suspend, or revoke membership or access to the Platform".

Great Britain

The Gambling Act 2005 and the Gambling Commission cover Great Britain: apart from a few sections, the Act extends only to England and Wales and to Scotland (section 361), and Northern Ireland is outside it.

• Operators need a licence. Under section 33 of the Gambling Act 2005, a person commits an offence if they provide facilities for gambling without an operating licence (or another exception in the Act). The Gambling Commission's advice to players: "Before you gamble, check that the business has a Gambling Commission licence"; licensed businesses are listed in its public register.
• Account restrictions are the operator's commercial decision. The Commission's player guidance says: "Gambling businesses have the right to close any account and it may do so for many reasons." In July 2025 its chief executive, citing the Gambling White Paper, wrote that "Being a successful bettor is not a protected characteristic in discrimination law", and that licensed operators should be transparent about "how, when and why an account might be restricted".
• Complaints go first to the gambling business, then to an alternative dispute resolution (ADR) provider.
• Exchanges. Both Polymarket and Kalshi list the United Kingdom among restricted countries in their own rules.

Canada

• Provinces run gambling. Section 207(1)(a) of the Criminal Code makes it lawful "for the government of a province … to conduct and manage a lottery scheme in that province". Bill C-218, the Safe and Regulated Sports Betting Act, received royal assent on June 29, 2021 and amended this section.
• Ontario opened its regulated igaming market on April 4, 2022, when the AGCO's Registrar's Standards for Internet Gaming came into force. iGaming Ontario publishes a directory of regulated sites (accurate as of September 1, 2026), and the AGCO tells players to look for the iGaming Ontario logo as a sign the site is "conducted and managed by iGaming Ontario". A dispute goes to the gaming site first, and the AGCO takes it after you have waited up to 90 days for the site's decision; complaints about responsible gaming, possible illegal activity or advertising can go to the AGCO directly.
• Account closure. The Registrar's Standards don't regulate commercial stake limits, but allow an operator to close an account: "Where necessary, a player account may be deactivated by the Operator" (standard 3.19). Limits themselves are set by the operator's own terms.
• Exchanges. Kalshi lists Canada as a restricted jurisdiction; Polymarket restricts Ontario, Alberta, British Columbia and Quebec.

Australia

• Online gambling services need a State or Territory licence. Under section 15AA of the Interactive Gambling Act 2001, a person commits an offence if they intentionally provide a regulated interactive gambling service with an Australian-customer link and do not hold a licence "under a law of a State or Territory".
• Sports betting online is treated differently before and after the start. The Act makes betting on sporting events an "excluded wagering service" only "to the extent to which the service is not an in-play betting service" (section 8A(3)); in-play means bets "placed, made, received or accepted after the beginning of the event" (section 10B).
• Digital currency. Section 15C makes it an offence for a regulated interactive wagering service to accept payment by credit card or digital currency from a customer physically present in Australia, with exceptions set out in the Act.
• The Act is enforced by the Australian Communications and Media Authority (ACMA). Most amendments made by the Interactive Gambling Amendment (Gambling Reform) Act 2026 commence on January 1, 2027. Both Polymarket and Kalshi list Australia as restricted.

Dozor data: how long surebets last

What it means: in live, almost every surebet is gone within seconds, so the legal question rarely comes up before the practical one — whether both operators accept the bet at that price. In prematch, four surebets in ten last over a minute.

What sportsbooks can do

Operators set the rules for arbers in their own terms, and some name arbitrage directly. Quotes from the terms of crypto sportsbooks that Dozor tracks, checked on November 6, 2026:

• Prohibit arbitrage. The sports betting rules published by Duel, BC.Game and Roobet — three brands on the BetBy platform — say arbitrage "is strictly prohibited on the Sportsbook" and that users "found engaging in arbitrage betting will face immediate cancellation of the Bets and permanent restrictions" (section 7.4.4 at BC.Game and Roobet; Duel's copy has no section numbers).
• Void bets. Shuffle's terms let it void or cancel a bet where it suspects that "you or a person associated with you engaged in arbitrage or matched betting" (section 12.4).
• Limit stakes. In the same BetBy rules, maximum stakes "are subject to change without prior written notice at the Sportsbook's discretion for any Event, Market, Operator, or End User individually" (section 7.1.3).
• Void obvious errors. "If a Market contains an obvious Error in the Odds … Bets placed on such a Market shall be void" (BetBy rules, section 7.2.5). Stake's help center: "The odds provider may void bets placed on incorrect offers as outlined in the sportsbook rules."

So before betting a surebet, read the terms of both books: a leg voided or a stake cut under them breaks the surebet whatever the law says about betting itself. How books spot and limit arbers is in why sportsbooks limit accounts; licences, verification and restricted countries of each crypto book are in crypto sportsbook arbitrage.

FAQ

Is arbitrage betting legal on Kalshi?

Kalshi is a CFTC-regulated exchange, and its member agreement doesn't mention arbitrage. What it sets is who may trade — not people domiciled in, organized in or located in the restricted jurisdictions of section VI — and Kalshi's right to condition, suspend or revoke access at its discretion. Fees and how Kalshi prices compare with sportsbooks are in Polymarket and Kalshi arbitrage.

Can you get banned for arbitrage betting?

An operator can limit your stakes or close your account under its terms; in Great Britain the regulator confirms operators may close accounts "for many reasons", and Massachusetts' rules let operators limit a patron's wager. Why and how books do it is in why sportsbooks limit accounts.

Is arbitrage betting illegal anywhere?

We don't draw legal conclusions. The laws above regulate who may offer gambling and on what terms; check your own jurisdiction's law and the operator's licence, and ask a lawyer if in doubt.

Sources

Checked on November 6, 2026.

• United States: Murphy v. NCAA, 584 U.S. 453 (2018); 205 CMR 247.00, Massachusetts Gaming Commission (as amended through April 24, 2026); CFTC press release 8302-20 (Kalshi designated as a DCM); how Kalshi is regulated; trading on Kalshi from outside the US; Kalshi Member Agreement, version of October 1, 2026.
• Great Britain: Gambling Act 2005, section 33 and section 361; Gambling Commission: check the licence, public register, my account has been closed, how to complain, commercial restrictions by betting operators (July 23, 2025).
• Canada: Criminal Code, section 207; Bill C-218; AGCO: Registrar's Standards for Internet Gaming (updated May 14, 2026), player support, complaints; iGaming Ontario directory of regulated sites.
• Australia: Interactive Gambling Act 2001, sections 8A, 10B, 15AA and 15C (compilation No. 24, October 14, 2024); Interactive Gambling Amendment (Gambling Reform) Act 2026 (schedules commence January 1, 2027); ACMA.
• Sportsbook terms: Roobet sportsbook policy, BC.Game terms and sports rules, Duel sports betting rules (September 1, 2026), Shuffle terms (version 2.1, October 2026), Stake help: voided bets (August 24, 2026).
• Polymarket: geographic restrictions (updated October 29, 2026).
• Dozor: data — methodology.