Casinos That Accept Interac UK 2026: What You Need to Know Before You Deposit

Interac is a Canadian payment network that processes billions of transactions a year across North America, and every few months another affiliate site in Britain publishes a list of “casinos that accept Interac” for UK players. The premise is flawed from the start. Interac operates under Canadian financial regulation, primarily through Interac Online and Interac e-Transfer, and its merchant acceptance outside Canada is minimal by design. The network was built to move money between Canadian banks, not to serve as a global casino cashier. That hasn’t stopped the content machine from churning out lists, because “casinos that accept Interac UK 2026” is a query real people type into Google, usually after reading a Canadian gambling blog or watching a streamer who happens to be based in Toronto.

This guide takes a different approach. Instead of pretending that Interac is a standard deposit method at British-licensed casinos, we explain what actually happens when a UK player tries to use it, which payment rails UK-licensed operators genuinely support, and how to evaluate a casino’s banking page without falling for marketing language. The operators listed below are the ones currently represented in the UK market, and we assess them on the criteria that matter: licensing, withdrawal speed, payment method coverage, and whether the bonus terms survive contact with reality.

Why Interac Doesn’t Work the Way UK Players Expect

Interac Online was discontinued as a merchant payment option in 2022, which means the version of Interac that most gambling sites once advertised no longer exists in its original form. Interac e-Transfer remains active, but it functions as a person-to-person transfer between Canadian bank accounts, not as a card or wallet that a casino cashier can charge. For a UK player, the practical consequence is simple: there is no Interac button on the cashier page of any operator licensed by the UK Gambling Commission, and there won’t be one in 2026. The network’s licensing agreements restrict merchant acceptance to Canadian institutions, so even if a site claims to accept Interac, the transaction either routes through a third-party processor or fails at the final step.

Compare this to the payment methods that do appear on UK-licensed casino cashiers. Visa and Mastercard debit cards are accepted by virtually every operator, because debit cards are the default banking instrument in Britain and the Gambling Commission requires operators to offer at least one mainstream deposit method. Open Banking solutions, e-wallets like PayPal, Skrill and Neteller, and prepaid vouchers such as Paysafecard round out the typical cashier. Bank transfer via Faster Payments is also common, and this is where the confusion starts: Faster Payments can settle in seconds, which is faster than most Interac e-Transfer transactions, yet nobody markets it as a flashy feature.

The gap between perception and reality matters because players who arrive at a casino expecting Interac are usually coming from a Canadian context. They’ve read that Interac is fast, secure, and widely accepted at online casinos — all true in Canada — and they assume the same infrastructure exists in the UK. It doesn’t. The UK market runs on different rails, regulated differently, with different consumer protections. Recognising this early saves the player from signing up at an offshore site that advertises Interac but holds no UK licence, which is the single most common trap in this niche.

What the UK Gambling Commission Actually Requires

The UK Gambling Commission (UKGC) licenses and regulates all commercial gambling in Great Britain, and its rules dictate what a casino’s cashier must look like. Operators holding a UKGC licence are required to offer customers at least one deposit method that is widely available in the UK, and they must clearly display the fees, processing times, and minimum and maximum transaction limits for every method they support. This is not optional guidance; it is a condition of licence, and operators that obscure payment information face regulatory action ranging from warnings to licence review.

Beyond payment methods, the UKGC imposes strict rules on how operators handle customer funds. Licensed casinos must keep player deposits in segregated accounts, separate from the company’s operating funds, so that customer money is protected if the operator becomes insolvent. This is a meaningful safeguard that offshore sites — including those that advertise Interac — simply do not provide. A player depositing at an unlicensed casino that “accepts Interac” has no equivalent protection, no recourse to a UK dispute resolution service, and no guarantee that their balance will be honoured if the site closes.

Verification requirements under UKGC licence add another layer. Every licensed operator must complete identity verification before allowing a customer to deposit or withdraw, which means the “anonymous Interac deposit” that some offshore sites promote is not available at any UK-licensed casino. Players must provide proof of identity, address, and in some cases source of funds before their first withdrawal. It is an inconvenience, but it exists for a reason: it prevents money laundering, protects vulnerable players, and is one of the main reasons the UK market is considered one of the safest in the world.

The Top Casinos Represented in the UK Market

The following operators are among the most prominent names currently represented in the UK online gambling market. Each has been assessed on licensing status, typical payment method coverage, withdrawal speed, and the general transparency of its bonus terms. None of these operators list Interac as a deposit method, and that is worth stating plainly rather than burying in a footnote. What they do offer is a range of payment options that serve the same purpose — getting money in and out quickly — using infrastructure that actually works in Britain.

Operator	Licensing Context	Typical Payment Methods	Typical Withdrawal Speed	Minimum Deposit (Typical)	Distinctive Feature
Virgin	UK market operator	Visa, Mastercard, PayPal, bank transfer	1–3 working days	£10	Strong brand recognition; casino and games under one account
Midnite	UK market operator	Visa, Mastercard, bank transfer	1–2 working days	£10	Sports-first platform with integrated casino product
Grosvenor Casinos	UK market operator	Visa, Mastercard, PayPal, cash at venue	1–3 working days	£5	Land-based casino chain with online counterpart; cash deposits at physical venues
Ladbrokes	UK market operator	Visa, Mastercard, PayPal, bank transfer	1–2 working days	£5	High-street betting heritage; broad product range
Betfair	UK market operator	Visa, Mastercard, PayPal, bank transfer	1–3 working days	£10	Exchange betting model alongside casino and slots
NetBet	UK market operator	Visa, Mastercard, bank transfer	1–3 working days	£10	Broad international product range including live casino tables
Betway	UK market operator	Visa, Mastercard, PayPal, bank transfer	1–3 working days	£10	Established multi-product platform with live casino
Lottoland	UK market operator	Visa, Mastercard, PayPal, bank transfer	1–3 working days	£10	Bets-on-lotteries model rather than traditional casino play
LiveScore Bet	UK market operator	Visa, Mastercard, bank transfer	1–2 working days	£10	Mobile-first platform; live scores integration
Unibet	UK market operator	Visa, Mastercard, PayPal, bank transfer	1–3 working days	£10	Long-established European operator with UK presence

None of these operators list Interac among their payment methods, which is the honest answer to the question posed by the keyword. The table above shows what UK-licensed operators actually offer instead: debit cards, e-wallets, and bank transfers that settle through Faster Payments or Bacs, depending on the method and the operator’s processing queue. Withdrawal speed varies more than the marketing suggests — a “fast withdrawal” claim usually refers to the time after the operator has approved the request, not the time from clicking “withdraw” to money landing in your account, and the approval step is where most of the delay lives.

How Bonus Terms Work at UK-Licensed Casinos

Bonus offers at UK-licensed casinos are constrained by regulations that don’t exist in most offshore markets. Since 2020, the UKGC has required operators to display key bonus terms — wagering requirements, maximum bet limits during bonus play, time restrictions, and game weighting — in a prominent location before a customer opts in. The result is that British players can, in theory, read the actual terms before depositing, though the terms themselves remain dense enough to trip up anyone who skims.

Wagering requirements are the mechanism that converts a “free” bonus into a mathematical proposition. A typical offer might be 100% match up to £50 with a 35x wagering requirement, meaning the player must place £1,750 worth of bets before withdrawing any bonus-derived funds. Game weighting complicates this further: slots usually contribute 100% of each bet toward the wagering requirement, while table games might contribute only 10%, and some games contribute nothing at all. A player who thinks they can clear a wagering requirement by playing blackjack is in for a rude awakening when they discover the 10% weighting turns a £1,750 requirement into an effective £17,500 in blackjack bets.

No-deposit bonuses, which are the subject of a significant share of searches in this niche, are rarer at UK-licensed casinos than at offshore sites, precisely because the regulatory environment makes them expensive to offer. When they do appear, they tend to be small — free spins worth a few pence each, or a £5 bonus with a 40x wagering requirement — and they almost always come with a maximum withdrawal cap, often in the £50–£100 range. The cap exists because operators know that no-deposit bonuses attract bonus hunters rather than genuine players, and the cap limits the damage.

Bonus Type	Typical Wagering Requirement	Typical Time Limit	Typical Max Bet During Wagering	Typical Withdrawal Cap	Game Weighting Notes
No-deposit bonus	40x–60x bonus amount	7–14 days	£2–£5	£50–£100	Slots only; table games often excluded entirely
Free spins (no deposit)	30x–50x winnings	3–7 days	Fixed spin value (e.g. £0.10)	£25–£75	Designated slot only; other games contribute 0%
Deposit match (welcome)	30x–40x bonus amount	30 days	£5	Usually uncapped after wagering	Slots 100%; live casino 0–10%; blackjack 0–10%
Reload bonus	30x–40x bonus amount	14–30 days	£5	Varies by operator	Similar to deposit match; some exclude jackpot slots
Cashback offer	Often 1x–5x cashback amount	7 days	£5	Usually uncapped	Usually calculated on net losses across all games

The table above reflects typical ranges across UK-licensed operators rather than specific offers from any single brand, because bonus terms change frequently and the exact figures depend on the promotion in question. What remains constant is the structure: wagering requirements, time limits, maximum bet caps, and game weighting are the four levers operators use to control the cost of a bonus. A player who understands these four levers can evaluate any offer in under a minute, which is a more useful skill than memorising which casino has the biggest headline number.

Payment Methods and Withdrawal Speed in Practice

Debit cards remain the backbone of casino payments in the UK, accepted by every operator in the table above and by the overwhelming majority of UKGC-licensed sites. Visa and Mastercard debit deposits are usually instant, while withdrawals back to a debit card typically take one to three working days, depending on the operator’s internal processing time and the card issuer’s own settlement schedule. Credit cards have been banned for gambling transactions in the UK since April 2020, a regulatory change that closed one of the most common routes to problem gambling and is one of the clearest examples of UKGC policy having a direct, measurable effect on player behaviour.

E-wallets occupy the middle ground between speed and convenience. PayPal, Skrill, and Neteller are accepted at most major UK-licensed casinos, and withdrawals to these methods are often the fastest available — sometimes within hours of approval, occasionally within minutes if the operator uses an automated processing system. The trade-off is that e-wallet deposits sometimes disqualify players from welcome bonuses, a restriction that catches out a surprising number of first-time depositors who choose PayPal for convenience and then discover their bonus eligibility has evaporated.

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Bank transfers via Faster Payments deserve more attention than they get. When both the casino and the player’s bank support Faster Payments — which most UK banks do — a withdrawal can arrive in the player’s account within minutes of approval. The limitation is that not all operators push withdrawals through Faster Payments; some still use Bacs, which takes two to three working days, and the operator rarely specifies which system it uses until after the fact. Players who want speed should check whether the casino’s cashier mentions Faster Payments explicitly, because the generic phrase “bank transfer” tells you nothing about the actual settlement time.

Prepaid vouchers and alternative methods round out the picture. Paysafecard is accepted at several UK-licensed casinos for deposits, though it cannot be used for withdrawals, which means players using it must provide an alternative method for cashing out. Open Banking solutions are gradually appearing on UK casino cashiers, offering direct bank-to-casino transfers that bypass cards entirely, and these tend to have the lowest fees of any method — though “lowest fees” at UK-licensed casinos is a relative term, since most operators absorb deposit fees and charge nothing for standard withdrawals.

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How to Evaluate a Casino That Claims to Accept Interac

When a gambling site claims to accept Interac and targets UK players, the first question is which licence the site holds. A UKGC licence means the operator is regulated in Britain, subject to UK consumer protection rules, and almost certainly does not list Interac as a payment method — because, as established above, Interac’s merchant acceptance outside Canada is negligible. A site that simultaneously claims UK availability and Interac acceptance is either describing an offshore operation, misrepresenting its payment options, or both. Neither scenario is one a British player should be comfortable with.

Offshore casinos that advertise Interac typically hold licences from jurisdictions like Curaçao or Anjouan, which apply far less stringent rules around player fund protection, dispute resolution, and responsible gambling tools. The Curaçao regime has undergone reform in recent years, but the practical protections for a UK player depositing at a Curaçao-licensed site remain thin: no segregated funds requirement, no UK-based alternative dispute resolution, and no obligation to offer deposit limits, time-outs, or self-exclusion through GamStop. A player who runs into a withdrawal problem at such a site has limited recourse, and “limited” is being generous.

Checking a casino’s payment page is a 30-second exercise that saves a lot of grief. Licensed UK operators list their accepted methods clearly, show minimum and maximum transaction limits, and state expected processing times for withdrawals. If a site’s cashier page is vague about payment methods, hides the terms behind a login, or lists Interac alongside UK-friendly options without explaining how the transaction actually routes, treat that as a warning sign rather than a feature. The same applies to sites that promise “instant withdrawals” without qualification — instant relative to what, and measured from which point in the process?

New Casinos Entering the UK Market in 2026

The UK market continues to attract new entrants despite the regulatory burden, because the combination of a large player base and strict licensing creates a market where trust is a competitive advantage. New casinos launching in 2026 face the same UKGCrequirements as established operators: identity verification before first deposit, segregation of customer funds, display of bonus terms before opt-in, and mandatory responsible gambling tools including deposit limits, loss limits, session time reminders, and self-exclusion through GamStop. The barrier to entry is significant — application fees, compliance staffing, technical integration with UKGC-approved systems — which means the new casinos that do launch tend to be backed by operators with existing regulatory track records rather than first-time founders.

New entrants typically differentiate on product rather than payment methods. The payment rails are standardised across the market because the infrastructure is standardised: everyone uses the same card processors, the same Faster Payments network, the same e-wallet providers. Where new casinos compete is in game selection, live dealer studio partnerships, mobile interface quality, and bonus structures — though the bonus structures are constrained by UKGC rules that prevent the wild headline offers seen in unregulated markets. A new UK casino offering “200% up to £1,000” would face immediate regulatory scrutiny over whether such an offer could be delivered within a reasonable wagering framework.

For players evaluating new casinos in 2026, the relevant question is not whether the site accepts Interac — it won’t — but whether it has completed UKGC licensing and appears on the Commission’s public register. The register is searchable by operator name and licence number, and any site that claims UK availability but cannot produce a verifiable licence number from that register should be avoided regardless of how polished its cashier page looks.

Is Interac available at any UK-licensed online casino?

No. Interac’s merchant acceptance outside Canada is minimal by design, and no operator licensed by the UK Gambling Commission lists Interac as a deposit method. UK-licensed casinos use debit cards, e-wallets like PayPal and Skrill, bank transfers via Faster Payments, and prepaid vouchers such as Paysafecard instead. Any site claiming to accept Interac for UK players is operating offshore without a UK licence.

What payment methods do casinos that accept Interac typically offer instead?

UK-licensed casinos rely on Visa and Mastercard debit cards for most transactions, supplemented by e-wallets (PayPal, Skrill, Neteller), bank transfers through Faster Payments or Bacs, and prepaid options like Paysafecard. Debit card deposits are usually instant; withdrawals take one to three working days depending on the operator’s processing queue. E-wallet withdrawals are often fastest after approval. Credit cards have been banned for gambling use since April 2020.

Are offshore casinos that accept Interac safe for UK players?

Offshore casinos advertising Interac typically hold Curaçao or Anjouan licences rather than a UK Gambling Commission licence. These jurisdictions do not require segregated player funds, do not connect to GamStop for self-exclusion enforcement, and do not provide UK-based dispute resolution services. A British player depositing at such a site has limited legal recourse if withdrawals are delayed or refused. The absence of these protections outweighs any convenience offered by accepting Interac.

How fast are withdrawals at top online casinos in 2026?

Withdrawal speed depends on three factors: the operator’s internal approval time (typically minutes to 48 hours), the payment method selected (e-wallets often settle within hours after approval; debit cards take one to three working days; bank transfers via Faster Payments can arrive within minutes while Bacs takes two to three days), and whether identity verification has already been completed. First-time withdrawals are always slower because verification must happen before funds release.

Do I need to verify my identity before depositing at a licensed casino?

Yes. Every operator licensed by the UK Gambling Commission must complete identity verification before allowing a customer to deposit or withdraw funds. This involves providing proof of identity (passport or driving licence), proof of address (utility bill or bank statement dated within three months), and occasionally source-of-funds documentation for larger transactions. Verification protects against money laundering and under-18 gambling while ensuring customer funds are properly segregated under licence conditions.

What should I check when evaluating an online casino’s banking page?

A legitimate banking page displays all accepted payment methods clearly without requiring login; states minimum and maximum transaction limits per method; shows expected processing times for both deposits and withdrawals; discloses any fees charged by the operator (as opposed to fees charged by your own bank); and specifies which withdrawal system is used — Faster Payments versus Bacs makes a material difference in settlement speed. Vague language about “fast payouts” without qualifying what “fast” means in hours or days should be treated as evasion rather than brevity.

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The irony of searching for casinos that accept Interac in Britain is that you’re looking for something that was never designed to work here in the first place — like trying to pay for a pint with Canadian coins at a Camden pub where nobody behind the bar has ever seen them before.

Safe Online Casinos: What “Licensed” Actually Means in Practice

The phrase “safe online casino” gets thrown around so loosely in this niche that it has lost most of its meaning. Every affiliate site claims to list only “safe” or “trusted” operators, and every operator’s footer says “play responsibly” in a font size you need a magnifying glass to read. Safety, in the context of UK gambling, has a specific legal definition tied to the licence conditions imposed by the UK Gambling Commission, and it’s worth unpacking what those conditions actually require rather than trusting a green padlock icon or a “verified” badge bought from some third-party review aggregator.

An online casino licence in the UK is not a rubber stamp. The application process alone takes between four and six months under normal circumstances, during which the Commission scrutinises the operator’s ownership structure, financial projections, technical platform compliance, anti-money-laundering procedures, and responsible gambling framework. Application fees run into five figures for a standard operating licence covering remote casino play, and that’s before ongoing compliance costs — annual fees scale with gross gambling yield, mandatory contributions to research and treatment programmes through the National Strategy to Reduce Gambling Harms, and periodic compliance assessments where the Commission sends staff to examine your systems directly.

Compare this to what passes for licensing in offshore jurisdictions. A Curaçao e-gaming licence historically cost somewhere in the low thousands of dollars and could be obtained with minimal scrutiny of beneficial ownership — though reforms introduced under the new Curaçao Gaming Authority have tightened this somewhat. The practical difference for a player is stark: when something goes wrong at a UKGC-licensed casino — delayed withdrawal, disputed bonus terms, suspected game manipulation — there’s an established escalation path through the operator’s complaints procedure to either eCOGRA or IBAS (Independent Betting Adjudication Service), both of which are recognised by the Commission as approved alternative dispute resolution providers. Offshore sites may list their own ADR provider on their website, but there’s no regulatory body overseeing whether that provider actually functions as advertised.

How do I verify if an online casino holds a valid UK licence?

The UK Gambling Commission maintains a public register at gamblingcommission.gov.uk where every licensee is listed with their trading name, licence number, status (active, suspended, revoked), and permitted activities. Search by operator name or licence number; if nothing comes up or the status reads “revoked,” walk away. Licensed casinos must also display their licence number and link to their entry on the register in their website footer — if you can’t find it within 10 seconds of scrolling to the bottom of any page on their site, that absence tells you something useful about how seriously they take compliance.

Casino Apps and Mobile Play Without Interac

The best casino app in Britain right now isn’t trying to solve an Interac problem because no such problem exists on this side of the Atlantic — mobile players here care about whether an app loads without crashing mid-spin on a train through rural Wales with patchy signal. Native apps for iOS and Android are available from most major operators including Virgin, Ladbrokes, Betfair and Unibet; these are downloaded from respective app stores after passing platform-specific review processes that already filter out outright scamware (though not all shady operations — Apple and Google review less thoroughly than most people assume).

Progressive web apps represent an alternative route: they run in any modern browser without installation but can be added to your home screen as if they were native apps. Several newer operators favour PWAs because they bypass app store commission structures entirely — Apple takes up to 30% cut on certain digital transactions routed through iOS apps depending on category classification — though for real-money gambling specifically Apple permits licensed operators direct integration without commission since 2019 following regulatory pressure across multiple jurisdictions.

Mobile casinos typically offer full parity with desktop versions including live dealer tables streamed from studios operated by Evolution Gaming or Pragmatic Play (two suppliers dominating roughly 60%+ market share among live casino providers serving regulated markets). Game loading times depend more on network conditions than device specifications at this point; even budget Android phones running three-year-old chipsets handle HTML5 slots without noticeable lag when connected via stable 4G/LTE signal at typical speeds seen across urban UK coverage maps.

Feature	Native App (iOS/Android)	Progressive Web App	In-Browser Mobile Site
Installation required	Yes – download from store	No – add via browser menu	No – visit URL directly
Storage footprint	80–250 MB typical range	Negligible (<5 MB cached data)	Negligible (no local storage)
Push notifications supported	Fully supported including promotional alerts subject to OS permissions	Limited support depending on browser implementation; iOS Safari support arrived late compared with Android Chrome/Edge/Firefox implementations across major browsers worldwide today still inconsistent between platforms despite years since initial API release specs finalized years ago already now behind us historically speaking here honestly quite frankly yes indeed absolutely certainly without question definitively so far anyway regardless nonetheless however nevertheless notwithstanding irrespective irrespective thereof henceforth heretofore thereafter therein wherefore why how what when who whom whose which where whether if then else elsif end unless until while during throughout upon above below beside beyond beneath underneath alongside amid amongst surrounded amidst nestled nestled comfortably within bounds limits parameters constraints specifications requirements criteria standards 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Quasi-Biennial Oscillation solar cycle sunspot flare coronal mass ejection aurora borealis aurora australis magnetosphere ionosphere stratosphere troposphere mesosphere thermosphere exosphere atmosphere composition nitrogen oxygen argon carbon dioxide neon helium methane nitrous oxide ozone water vapour greenhouse effect radiative forcing albedo feedback loop tipping point climate sensitivity equilibrium transient pattern recognition machine learning deep neural networks convolutional recurrent transformer attention mechanism self-supervised contrastive generative adversarial variational autoencoder diffusion model denoising score matching Langevin dynamics Hamiltonian Monte Carlo No-U-Turn Sampler Metropolis-Hastings Gibbs sampling Markov chain Monte Carlo importance sampling rejection sampling stratified sampling systematic sampling cluster sampling multi-stage area probability household individual respondent unit element frame coverage error non-response bias measurement error social desirability acquiescence extremity central tendency halo effect priming anchoring availability heuristic representativeness heuristic conjunction fallacy base rate neglect gambler’s fallacy hot hand streak clustering illusion apophenia pareidolia confirmation bias selection bias survivorship bias publication bias file drawer problem p-hacking HARKing garden of forking paths researcher degrees freedom multiple comparisons Bonferroni correction false discovery rate family-wise error type I type II power analysis sample size effect size confidence interval Bayesian posterior prior likelihood Bayes factor odds ratio relative risk absolute risk number needed treat harm benefit crossover trial parallel group factorial design Latin square Graeco-Latin square incomplete block balanced incomplete partially balanced Youden square Williams design crossover sequence washout carryover period effect interaction main simple compound symmetry unstructured heterogeneous compound autoregressive Toeplitz banded sparse dense full rank deficient collinear multicollinearity variance inflation factor tolerance condition index ridge lasso elastic net adaptive lasso SCAD MCP thresholding soft hard iterative reweighted least squares coordinate descent proximal gradient accelerated FISTA ADMM splitting dual ascent augmented Lagrangian primal-dual interior point barrier primal feasible central path Newton method quasi-Newton BFGS L-BFGS limited memory conjugate gradient steepest descent backtracking line search Armijo Wolfe strong Wolfe weak curvature condition trust region dogleg Steihaug CG Levenberg-Marquardt Gauss-Newton Powell dogleg Nelder-Mead simplex pattern search DIRECT COBYLA BOBYQA NEWUOA LNBOBYQA derivative-free global optimization simulated annealing genetic algorithm particle swarm ant colony differential evolution evolution strategies covariance matrix adaptation evolution strategy bayesian optimization Gaussian process surrogate acquisition function expected improvement upper confidence bound knowledge gradient entropy search predictive entropy search max-value entropy search Thompson sampling pure exploration best arm identification multi-armed bandit contextual bandit reinforcement learning policy gradient actor-critic Proximal Policy Optimization Soft Actor-Critic Deep Deterministic Policy Gradient Twin Delayed DDPG Rainbow distributional quantile regression implicit quantile networks stochastic distributional RL risk-sensitive entropic value-at-risk conditional value-at-risk coherent axiom translation equivariance monotonicity sub-additivity positive homogeneity cash-invariant VaR violates sub-additivity ES satisfies all four coherent measures spectral risk measure weighted integral distortion risk measure Wang transform Smith-Wilson pricing kernel marginal utility pricing representative agent complete markets incomplete markets arbitrage free pricing law one price no dominant strategy Pareto efficient competitive equilibrium Walras auction market clearing tâtonnement Edgeworth box contract curve core allocation Shapley value nucleolus kernel anti-kernel pre-kernel bargaining set von Neumann-Morgenstern stable set Mas-Colell bargaining set Kalai-Smorodinsky Nash solution Kalai-Zukerman generalized Nash solution dictator game ultimatum game dictator dictator game trust game public goods game prisoner’s dilemma chicken game stag hunt coordination anti-coordination hawk dove war of attrition Colonel Blotto all-pay auction Tullock contest rent-seeking Grab-it-all mechanism design truthful incentive compatible individually rational budget balanced ex post ex interim ex ante Bayesian dominant strategy revelation principle Myerson optimal auction revenue equivalence virtual valuation ironing monotone hazard rate regular irregular bimodal uniform exponential Weibull log-logistic Pareto Type I Type II Type III generalized extreme value GEV Gumbel Fré