Prediction Today Fees & Costs: What You'll Actually Pay

The Reality of Prediction Market Costs

When you trade on a prediction market, the headline fee is rarely the full story. Unlike traditional stock exchanges where you see a clear commission percentage, prediction markets operate with a patchwork of cost structures that can silently erode your returns. Whether you're betting on election outcomes, technology milestones, or economic indicators, the fees you pay—visible and invisible—directly reduce your profit potential.

The prediction market landscape in 2026 includes platforms ranging from Polymarket (which operates on a decentralised model) to various centralised competitors, each with distinct fee philosophies. Some charge nothing upfront but embed costs in spreads. Others take explicit commissions. A few operate on subscription models. The key is understanding not just what you pay, but when and why you pay it.

This guide breaks down the real costs you'll encounter, how they compare across platforms, and how to factor them into your prediction trading strategy.

Understanding Spreads vs. Explicit Fees

The most common source of confusion is the difference between trading spreads and explicit fees. These are fundamentally different cost mechanisms, and conflating them can lead to poor decision-making.

Spreads are the gap between the price at which you can buy a yes outcome and the price at which you can sell it. On Polymarket, for example, if a market shows 55¢ for yes and 56¢ for bid, that 1¢ spread is your implicit cost. You don't pay it as a line item; it's baked into the price you receive. For a £1,000 bet, a 2% spread costs you roughly £20 in lost value immediately upon entry.

Explicit fees are direct charges: a percentage of your trade, a flat amount per transaction, or a withdrawal fee. Some platforms charge 2–5% per trade. Others charge only on withdrawal. A few charge nothing at all but compensate through wider spreads or other mechanisms.

The interaction between these matters. A platform with zero explicit fees but 3% spreads on illiquid markets can be far more expensive than a platform charging 1% commission on tight, liquid markets. You need to know both to calculate your true cost of entry and exit.

Polymarket's Fee Structure and How It Compares

Polymarket, the largest prediction market platform globally, charges no explicit trading fees. You won't see a commission deducted from your account. However, this doesn't mean trading is free.

Polymarket operates on a spread-based model. The platform displays two prices for each outcome: the best bid (what buyers will pay) and the best ask (what sellers ask). The difference is where the platform and liquidity providers extract value. On highly liquid markets like major election outcomes, spreads might be 0.5–1%. On niche or low-volume markets, spreads can exceed 5%.

Additionally, Polymarket charges a settlement fee of 2% on winnings in certain jurisdictions and market types. This is deducted when your position resolves in your favour. So if you win £1,000, you pay £20 in settlement fees. This is a crucial cost that many new traders overlook.

Polymarket also imposes withdrawal fees that vary by blockchain and network congestion. Withdrawing funds via Polygon (the default low-cost option) typically costs £1–5. Withdrawing via Ethereum mainnet can cost £10–50 depending on gas prices. These aren't Polymarket's fees per se, but they're real costs you'll bear.

Compared to traditional betting platforms, Polymarket's model is competitive on liquid markets but can be expensive on illiquid ones. Compared to some centralised prediction market competitors, Polymarket's 2% settlement fee is relatively high, though offset by the absence of trading commissions.

Other Prediction Market Platforms and Their Cost Models

Several alternatives to Polymarket exist, each with different fee structures worth understanding.

Kalshi (a regulated US-based platform) charges no trading fees but takes a 2–5% cut on winnings, depending on the market. It also charges withdrawal fees, typically £2–10 depending on your payment method. Kalshi's advantage is regulatory clarity in the United States; its disadvantage is limited availability outside the US and restricted market types.

PredictIt (also US-regulated) charges a 10% fee on winnings, significantly higher than Polymarket or Kalshi. However, PredictIt has a long track record and strong liquidity on certain political markets. For traders focused solely on US politics, the higher fee may be justified by better pricing and faster settlement.

Manifold Markets operates as a play-money platform with optional real-money markets. Its fee structure is more transparent for small traders but less developed for serious prediction market investors. Fees vary by market and are often lower (1–2%) but liquidity is fragmented.

Betfair Exchange (primarily a sports betting platform) offers prediction-market-like functionality through its exchange model. It charges commission on net winnings, typically 2–5% depending on your loyalty tier. Betfair's strength is liquidity on major sports and political events; its weakness is a more complex interface and limited coverage of non-sports predictions.

None of these platforms is universally "cheapest." The best choice depends on which markets you trade, your volume, and your geography.

Hidden Costs: Slippage, Liquidity, and Timing

Beyond spreads and explicit fees, three hidden costs can significantly impact your returns: slippage, liquidity constraints, and timing risk.

Slippage occurs when you place a large order and the price moves against you before the order fills. On a liquid market, a £10,000 bet might execute at the quoted price. On an illiquid market, your order might only partially fill at the quoted price, with the remainder filling at worse prices. The difference is slippage. It's not charged as a fee, but it reduces your effective return. On prediction markets with thin order books, slippage can easily exceed 2–3% on large trades.

Liquidity constraints also affect exit costs. If you want to close a position before market resolution, you're dependent on finding a counterparty willing to take the other side. On illiquid markets, you may need to offer a worse price to exit quickly. This is a real cost, even though it's not labeled as such. Traders often underestimate this when choosing markets with low trading volume.

Timing risk is the cost of information lag. Prediction markets move quickly when new information emerges. If you're trading on a platform with slower settlement or confirmation times, you may execute at stale prices. This is particularly relevant on decentralised platforms like Polymarket, where blockchain confirmation times can introduce delays.

Collectively, these hidden costs can add 1–5% to your effective trading cost, depending on market conditions and your trading style.

Deposit and Withdrawal Costs

Getting money into and out of prediction markets incurs fees that many traders overlook until they're ready to cash out.

Deposit costs vary by platform and payment method. Polymarket accepts deposits via cryptocurrency (Polygon, Ethereum, USDC) with minimal friction—typically just blockchain gas fees of £1–10. However, converting fiat currency to cryptocurrency to deposit often involves exchange fees of 1–3%, plus potential card or bank fees. If you're depositing £1,000, you might pay £20–50 in total deposit costs before your funds even enter the platform.

Centralised platforms like Kalshi and PredictIt accept bank transfers and card payments directly, eliminating the cryptocurrency conversion step. However, they may charge deposit fees (typically £0–10) and have slower settlement (1–3 business days).

Withdrawal costs are often higher than deposit costs. Polymarket withdrawals via Polygon cost £1–5; via Ethereum, £10–50. PredictIt charges £0–10 depending on your withdrawal method. Kalshi similarly charges £2–10. These costs are particularly painful on small withdrawals. If you're withdrawing a £50 profit via Ethereum, a £30 gas fee wipes out most of your gain.

The practical implication: only withdraw when you've accumulated meaningful profits, and choose the cheapest withdrawal method available. On Polymarket, Polygon is almost always cheaper than Ethereum mainnet.

How Market Liquidity Affects Your Real Costs

Liquidity is the invisible cost multiplier in prediction markets. A 1% spread on a highly liquid market (like "Will the UK inflation rate exceed 3% in 2026?") is far cheaper than a 3% spread on a niche market (like "Will a specific tech company reach a £100bn valuation by Q4 2026?").

Polymarket and other platforms display order books, allowing you to see liquidity before you trade. A market with £100,000 in combined buy and sell orders at tight spreads is liquid. A market with £10,000 in orders and wide spreads is illiquid. The difference in your effective cost can be 2–3% or more.

Liquidity also varies by time of day and proximity to resolution. Markets tend to be more liquid during peak trading hours (typically 14:00–22:00 UTC) and tighter in the days before resolution when uncertainty is highest. Savvy traders exploit this: they enter positions during off-peak hours when spreads are wide and exit during peak hours when spreads are tight, effectively reducing their net cost.

When evaluating a prediction market, always check the order book depth. If you're planning a £5,000 trade, verify that there's at least £10,000 in opposing orders at prices close to the mid-market. If not, expect slippage.

Calculating Your Total Cost of Trading

To estimate your true cost of trading on any prediction market, use this framework:

• Entry cost: Spread (typically 0.5–3%) plus any explicit trading fee (0–5%) plus slippage (0–3%).
• Holding cost: Settlement fees if applicable (0–2% on winnings), plus any platform subscription or inactivity fees (rare, but some platforms charge these).
• Exit cost: Spread on exit (0.5–3%) plus explicit trading fee on exit (0–5%) plus slippage (0–3%).
• Withdrawal cost: Platform withdrawal fee (£0–50) plus any conversion fees if moving back to fiat currency (1–3%).

For a typical £1,000 trade on Polymarket with a 1% entry spread, 2% settlement fee, and 1% exit spread, your total cost is roughly 4%. On a niche market with 3% spreads and the same settlement fee, your total cost is 8%. On a highly liquid market with 0.5% spreads, your cost drops to 3%.

This is why market selection matters as much as prediction accuracy. A trader with 55% accuracy on expensive markets may lose money, while a trader with 52% accuracy on cheap, liquid markets may profit.

Frequently Asked Questions About Prediction Market Costs

Is there a prediction market with zero fees?

No legitimate prediction market charges truly zero fees. Polymarket charges no explicit trading fees but takes a 2% settlement fee on winnings and spreads vary by market. All platforms must recover costs somehow—through spreads, commissions, or other mechanisms. Beware of any platform claiming zero fees; it's either unsustainable or hiding costs elsewhere.

Which prediction market is cheapest overall?

It depends on your markets and geography. For highly liquid markets (major elections, economic indicators), Polymarket's zero trading fee plus tight spreads often makes it cheapest despite the 2% settlement fee. For US politics specifically, PredictIt's 10% winning fee is offset by exceptional liquidity. For sports-adjacent predictions, Betfair Exchange's 2–5% commission can be competitive. Always compare spreads and fees for your specific markets.

Can I reduce my costs by trading less frequently?

Yes, but with caveats. Fewer trades mean fewer opportunities to pay spreads and fees. However, holding positions longer exposes you to timing risk and the possibility of unfavourable price movements before you can exit. The optimal strategy is to trade only high-conviction predictions and avoid overtrading, not to avoid trading altogether.

Do prediction markets charge fees on losses?

Most don't. Polymarket charges settlement fees only on winnings. PredictIt charges only on winnings. However, you still pay spreads and slippage on losing trades, which is why your cost of entry and exit matters regardless of outcome. Some platforms do charge withdrawal fees even if you've lost money, effectively charging fees on your remaining balance.

Is it worth using a prediction market with higher fees if it has better liquidity?

Often yes. Better liquidity means tighter spreads and faster execution, which can more than offset higher explicit fees. A platform charging 2% commission on a market with 0.5% spreads may be cheaper than a platform charging 0% commission on the same market with 3% spreads. Always compare your total expected cost, not just the headline fee.

How do I minimise withdrawal costs?

On Polymarket, use Polygon network withdrawals (£1–5) rather than Ethereum mainnet (£10–50). On centralised platforms, use bank transfers instead of card withdrawals if available. Most importantly, withdraw infrequently—accumulate profits before withdrawing to amortise fixed withdrawal fees across larger amounts.

Final Thoughts on Prediction Market Costs

Prediction markets in 2026 are more accessible than ever, but costs remain a significant factor in profitability. The difference between trading on an expensive, illiquid market and a cheap, liquid one can easily be 5–10% of your capital per round trip. Over a year of active trading, this compounds dramatically.

The most successful prediction market traders obsess over costs. They choose markets based on liquidity, not just conviction. They time their entries and exits to exploit intraday spread variation. They withdraw infrequently and use the cheapest withdrawal methods. They understand that a 1% edge in cost is as valuable as a 1% edge in prediction accuracy.

Before you place your first trade, map out the full cost structure of your chosen platform for your specific markets. Compare it to alternatives. Only then commit capital. Small cost differences seem trivial on a single trade but compound into substantial differences over time.

For detailed, independent comparisons of prediction market platforms and their current fee structures, visit Prediction Today.