Key takeaway: Polymarket remains the largest prediction market globally, but several credible alternatives exist—including Manifesto Markets, Kalshi, and decentralised platforms. Each carries different regulatory standing, fee structures, and asset support. No prediction market is risk-free; all involve the possibility of total loss.
Why People Search "Polymarket Scam" and What the Reality Is
Polymarket is not a scam in the traditional sense—it is a functioning prediction market platform that has processed billions of pounds in trading volume since its 2020 launch. However, the platform operates in a legal grey area in several jurisdictions, particularly the United States, which generates legitimate concerns among users. The phrase "Polymarket scam" typically appears in search results because:
- Regulatory uncertainty: Polymarket operates without explicit approval from the US Commodity Futures Trading Commission (CFTC), though it claims an exemption under the Dodd-Frank Act for "small" prediction markets.
- Withdrawal and account restrictions: Users in certain regions report difficulty withdrawing funds or face account suspensions without clear explanation.
- Market manipulation concerns: Some high-profile markets have been accused of whale manipulation or insider trading, though this is not unique to Polymarket.
- Lack of deposit insurance: Unlike traditional financial institutions, Polymarket does not guarantee customer deposits.
- Confusion with scam sites: Several copycat websites and phishing attempts use Polymarket's name, which conflates legitimate concerns with outright fraud.
The distinction matters: Polymarket is a real platform with real operational challenges and regulatory friction, not a Ponzi scheme or exit scam. However, users should approach it with the same caution they would apply to any unregulated or lightly regulated financial platform.
Polymarket's Regulatory Status and Why It Matters
Understanding Polymarket's regulatory position is essential before comparing it to alternatives. In 2026, Polymarket continues to operate primarily on the Polygon blockchain and accepts deposits via stablecoins (USDC) and traditional payment methods through intermediaries. The platform claims to operate under a no-action letter from the CFTC, which technically means the regulator has not taken enforcement action—but this is not the same as explicit approval.
The CFTC has historically taken a dim view of unregulated prediction markets in the US. In 2023, the commission issued enforcement actions against other platforms. Polymarket's continued operation suggests either that its legal interpretation is sound or that enforcement priorities lie elsewhere. However, this creates uncertainty for users, particularly those in the United States.
In the United Kingdom and European Union, prediction markets occupy a different regulatory space. The UK Financial Conduct Authority (FCA) does not regulate pure prediction markets as heavily as betting exchanges, but there remains ambiguity. Most UK users can access Polymarket, though the platform may restrict certain features based on geolocation.
Risk disclosure: Regulatory status can change rapidly. A future CFTC enforcement action, legislative change, or court ruling could restrict or eliminate access to Polymarket for certain users. Funds held on any unregulated platform carry counterparty risk—if the platform faces legal action or insolvency, user assets may be frozen or lost.
Manifesto Markets: The UK-Regulated Alternative
Manifesto Markets is a UK-based prediction market platform that operates under FCA oversight, making it the most regulated option available to British users. Launched in 2024, it has positioned itself explicitly as a compliant alternative to Polymarket.
Key features:
- FCA authorisation: Manifesto Markets holds the necessary permissions to operate as a financial services firm in the UK, which means it must meet capital requirements, conduct proper KYC (know your customer) checks, and maintain segregated customer accounts.
- GBP deposits: Users can deposit and withdraw in British pounds directly, avoiding the need to purchase stablecoins or navigate cryptocurrency intermediaries.
- Market coverage: Manifesto focuses on UK and European political markets, as well as some international events. The selection is narrower than Polymarket but more curated.
- Lower liquidity: As a newer, smaller platform, Manifesto Markets has lower trading volumes and tighter spreads than Polymarket, which can mean less favourable odds for large trades.
- Withdrawal reliability: Because it is regulated, Manifesto Markets has clearer withdrawal obligations and dispute resolution mechanisms.
For UK-based users prioritising regulatory certainty over maximum market selection, Manifesto Markets represents a meaningful alternative. The trade-off is accepting a smaller ecosystem and potentially less competitive pricing.
Kalshi: The US-Regulated Option
Kalshi is a US-based prediction market platform that has taken a different regulatory approach than Polymarket. Rather than claiming an exemption, Kalshi applied for and received explicit approval from the CFTC to operate as a Derivatives Clearing Organisation (DCO) and Designated Contract Market (DCM).
Kalshi's regulatory advantage:
- CFTC approval: Kalshi operates with explicit permission, not a no-action letter. This provides significantly stronger legal footing.
- Customer protections: Kalshi maintains segregated accounts and complies with strict capital and operational requirements.
- Market types: Kalshi focuses on binary event contracts—yes/no questions about future events—which aligns with the CFTC's approved scope.
- Geographic restrictions: Kalshi is available to US users and some international users, but not all regions are supported.
- Smaller market selection: Kalshi has fewer markets than Polymarket, focusing on events where regulatory clarity exists.
Kalshi's explicit regulatory approval makes it arguably the safest prediction market for US residents, though it operates with a smaller catalogue of markets. For users outside the US, access may be restricted or unavailable.
Decentralised Alternatives: Omen, Gnosis, and Others
Beyond centralised platforms, several decentralised prediction markets operate on blockchain networks without a corporate intermediary. These platforms distribute risk differently but introduce new complexities.
Omen (powered by Gnosis): Omen is a decentralised prediction market built on the Gnosis blockchain. Users trade directly against smart contracts, and liquidity is provided by automated market makers (AMMs). There is no central company to regulate or shut down, but also no customer support team or regulatory oversight.
Advantages of decentralised markets:
- Censorship resistance: No single entity can restrict access or freeze accounts (though the blockchain itself could theoretically be modified).
- Transparency: All trades and market mechanics are visible on-chain.
- Lower fees: Without a corporate overhead, decentralised platforms often charge lower trading fees.
Disadvantages:
- User experience: Decentralised platforms require wallet setup, gas fees, and technical knowledge.
- Liquidity fragmentation: Markets may have lower liquidity, leading to wider spreads and slippage.
- Regulatory ambiguity: Decentralised platforms do not eliminate regulatory risk; regulators may target users or liquidity providers.
- Smart contract risk: Bugs or exploits in the underlying code could result in loss of funds.
Decentralised alternatives suit technically savvy users who prioritise censorship resistance over ease of use and customer support.
Comparative Fee and Liquidity Analysis
Prediction market platforms differ significantly in their cost structure and market depth. These differences compound over time for active traders.
Polymarket: Charges a 2% fee on winnings (not on the initial stake). Liquidity is highest for major political and sports events, with some markets showing millions of pounds in trading volume. Spreads on popular markets are tight, typically 1–3%.
Manifesto Markets: Charges a 1% fee on winnings, lower than Polymarket. However, liquidity is lower, so spreads on less popular markets can reach 5–10% or more.
Kalshi: Charges a flat fee structure (typically $0.01 per contract), which is competitive for small trades but less favourable for large positions. Liquidity varies by market; major US political events have reasonable depth, whilst niche markets are thin.
Omen (decentralised): Charges only network gas fees (typically £0.50–£5 per transaction on Gnosis, depending on network congestion), making it extremely cheap for small trades. However, slippage on larger trades can be substantial due to AMM mechanics.
For casual traders, fee differences matter less than for professionals. However, active traders should calculate the total cost of entry and exit, including fees and slippage, before committing capital.
Market Selection and Event Coverage
The breadth of available markets is a key differentiator. Polymarket's competitive advantage lies largely in its sheer number of markets and the diversity of events covered.
Polymarket: Offers thousands of markets spanning US and international politics, sports, cryptocurrency, entertainment, and niche topics. Users can even create custom markets, though these typically have minimal liquidity.
Manifesto Markets: Focuses on UK and European politics, with some international coverage. Markets are curated by the platform to ensure clarity and resolvability. Fewer markets overall, but higher average quality.
Kalshi: Concentrates on US-regulated event types: primarily political elections, economic data releases, and sports. Fewer than 100 active markets at any given time.
Omen: Market selection depends on what liquidity providers choose to create. Coverage is unpredictable but can include niche topics that larger platforms exclude.
Users seeking maximum choice should use Polymarket. Those prioritising curated, high-quality markets should consider Manifesto Markets. Traders focused on specific domains (US politics, economics) may find Kalshi sufficient.
Security, Custody, and Withdrawal Concerns
A critical question for any financial platform is: where is your money, and can you reliably get it back?
Polymarket custody: Deposits are held in stablecoins (primarily USDC) in smart contracts or custodial accounts. Withdrawals are processed via intermediaries and can sometimes take days or face unexplained delays. The platform has faced user complaints about frozen accounts, particularly in the US, though these are often attributed to regulatory caution rather than malice.
Manifesto Markets custody: As an FCA-regulated firm, Manifesto must segregate customer funds in designated bank accounts. This provides stronger legal protection if the company faces insolvency. Withdrawals are processed to the user's registered bank account, typically within 1–2 business days.
Kalshi custody: Similarly, Kalshi maintains segregated customer accounts and complies with CFTC custody rules. Withdrawals are reliable and typically processed within 1–3 business days.
Omen custody: Funds remain in the user's own blockchain wallet at all times. There is no custodial risk from the platform itself, but users must manage their own private keys. Loss of a private key means permanent loss of funds.
For users uncomfortable with cryptocurrency custody, Manifesto Markets or Kalshi offer the strongest protections. For those already familiar with blockchain wallets, Omen eliminates intermediary risk entirely.
Frequently Asked Questions
Is Polymarket actually illegal?
Polymarket is not explicitly illegal, but it operates in a regulatory grey area. The CFTC has not granted explicit approval, though the platform claims a no-action letter exemption. Regulatory status could change, particularly in the US. Outside the US, legal status varies by jurisdiction.
Can I lose money on prediction markets?
Yes. Prediction markets are zero-sum games (excluding fees). If your prediction is wrong, your stake is lost. There is no insurance or protection against prediction error. Treat prediction markets as speculative investments, not savings accounts.
Which platform is safest for UK users?
Manifesto Markets is the safest option for UK users because it is FCA-regulated. However, it has fewer markets than Polymarket. Polymarket is accessible to UK users but carries regulatory uncertainty.
Can I withdraw my money anytime?
Most platforms allow withdrawals anytime the market is not in resolution. However, some users have reported delays or restrictions, particularly on Polymarket. Regulated platforms (Manifesto Markets, Kalshi) have clearer withdrawal obligations.
Do prediction markets have withdrawal limits?
Polymarket does not advertise explicit limits, but large withdrawals may trigger additional verification. Manifesto Markets and Kalshi may impose limits based on account verification level. Decentralised platforms have no limits beyond blockchain transaction sizes.
What happens if a market is resolved incorrectly?
On Polymarket, disputed resolutions can be escalated, but the platform has final say. Regulated platforms (Manifesto Markets, Kalshi) must provide dispute resolution mechanisms. Decentralised platforms rely on oracle mechanisms, which can be gamed.
Making Your Choice
Selecting a prediction market platform depends on your priorities:
- Maximum market selection: Polymarket
- Regulatory certainty (UK): Manifesto Markets
- Regulatory certainty (US): Kalshi
- Lowest fees and censorship resistance: Omen or other decentralised alternatives
- Balanced approach: Use Polymarket for major markets and Manifesto Markets for regulated alternatives
No prediction market is risk-free. All involve the possibility of total loss of capital. Before depositing funds, ensure you understand the regulatory status, fee structure, and withdrawal process of your chosen platform. Never invest more than you can afford to lose.
For a comprehensive, independent review of prediction market platforms and their features, visit Polymarket Scam?