Polymarket Fees Explained: Understanding Taker Fees by Category

Polymarket, a leading prediction market platform, allows users to trade on the outcome of real-world events. But like all marketplaces, Polymarket charges fees—specifically, taker fees when you accept an existing offer. These fees vary by market category, and understanding them is essential for anyone analyzing pricing gaps or seeking arbitrage opportunities across prediction markets and sportsbooks.

This article breaks down Polymarket’s taker fees, shows how they affect payouts and odds, and works through concrete examples. We’ll also discuss how automated tools like ArbMonster incorporate these fees when scanning for profitable pricing gaps.

Polymarket Fee Structure: The Basics

What is a Taker Fee?

On Polymarket, you can either:

• Place a limit order (maker): Post an order at your chosen price and wait for someone to fill it.
• Take an order (taker): Instantly match an existing order in the order book, paying a small fee for the privilege.

Taker fees are the focus here—they apply when you accept an already-posted offer, which is the case for instant execution and for most arbitrage calculations.

Fee Rates by Market Category

As of 2024, Polymarket taker fees are:

Category	Taker Fee %
Sports	2%
Crypto	2%
Politics/Current Events	2%
World Events	2%
Miscellaneous	2%

Note:

• Maker fees are currently 0%—only takers pay fees.
• Fees are charged on the amount paid (the cost basis), not the notional payout.
• Market categories are determined by Polymarket and shown on each market page.

How Taker Fees Affect Payouts and Odds

Let’s work through an example to see the impact of the 2% taker fee on a simple trade.

Example: Buying "YES" Shares

Suppose you see a market:

"Will Team X win the Championship?"

• Current "YES" price: $0.60 (i.e., a share pays $1 if Team X wins, $0 otherwise)
• You want to buy 100 shares instantly (as a taker)

Without Fees

• Cost = 100 × $0.60 = $60
• If Team X wins, payout = 100 × $1 = $100
• Net profit = $100 - $60 = $40

With 2% Taker Fee (Polymarket)

• Fee = $60 × 2% = $1.20
• Total spent = $60 + $1.20 = $61.20
• If Team X wins, payout = $100
• Net profit = $100 - $61.20 = $38.80

Effective Odds

• Implied probability (before fees): $0.60 → 60%
• Effective price (with fee): $61.20 / 100 = $0.612
• Effective implied probability: $0.612 → 61.2%

So, the 2% taker fee raises your effective entry price, slightly reducing your expected value and changing the math for arbitrage.

Example: Selling "NO" Shares

Suppose you want to bet against Team X:

• "NO" price: $0.42

• You sell 100 "NO" shares as a taker (i.e., you buy "NO" from the order book)

• Cost = 100 × $0.42 = $42

• Taker fee = $42 × 2% = $0.84

• Total spent = $42.84

• If Team X loses, payout = 100 × $1 = $100

• Net profit = $100 - $42.84 = $57.16

Arbitrage, Pricing Gaps, and Fee Math

When comparing Polymarket prices to other venues (like Kalshi or sportsbooks), you must always account for taker fees. Failing to do so can make apparent pricing gaps vanish in practice.

Let’s see how this works in a cross-market scenario:

Example: Comparing Polymarket and Sportsbook Odds

Suppose a sportsbook offers:

• Team X to win: +80 (implied probability ≈ 55.6%)
• You can bet up to $100

Polymarket shows:

• "YES" at $0.60 (before fee), max size: $250
• Taker fee: 2%

Step 1: Adjust Polymarket Price

• Actual cost per share = $0.60 × 1.02 = $0.612
• Implied probability = 61.2%

Step 2: Compare to Sportsbook

• Sportsbook implied probability: 100 / (180) = 0.555 → 55.6%

Step 3: Calculate Arbitrage Window

• If you could lay Team X at the sportsbook (betting against them) at 55.6% and buy YES on Polymarket at 61.2%, there’s a negative gap: not an arbitrage—the fees erase the possible edge.

Worked Example With a Gap

Suppose Polymarket "YES" is $0.56, sportsbook "NO" is -120 (implied prob = 54.5%).

• Polymarket cost: $0.56 × 1.02 = $0.5712
• Implied probability: 57.1%
• Sportsbook "NO" at -120 → lay probability: 54.5%

If you could bet both at fillable size, you’d check if (1 - sportsbook implied prob) > Polymarket implied prob. Here, the gap is 57.1% vs. 45.5%—no edge. But if the sportsbook price moves to +140 (implied probability 41.7%), the gap becomes 57.1% (after fee) vs. 41.7%, and you might find a possible arbitrage—but only after including the 2% fee.

Automated services like ArbMonster continuously scan Polymarket, Kalshi, and 20+ sportsbooks, netting out all fees, to surface actionable pricing gaps, taking these small but crucial fee differences into account.

Fees for Different Market Types

Polymarket currently applies the 2% taker fee across all categories: sports, crypto, politics, world events, and miscellaneous. Occasionally, special markets or promotions may change the fee for a specific market, but for nearly all active trading, you can assume 2% taker, 0% maker.

• Sports: All sporting event markets, e.g., NBA games, soccer, tennis
• Crypto: Markets on crypto prices, Bitcoin halving, etc.
• Politics/Current Events: U.S. elections, policy decisions
• World Events: War, pandemics, global crises
• Miscellaneous: Entertainment, culture, oddities

Always check the fee rate in the market info panel before trading, but in 2024, 2% taker is standard.

Practical Takeaways

• Taker fee is 2% of purchase amount, on all market categories.
• Effective price = quoted price × 1.02.
• Never ignore the fee in arbitrage or fair-value calculations.
• Maker orders (limit orders) do not pay fees, but may not fill quickly or at all.
• Fee structure is subject to change—check each market.
• Services like ArbMonster automate fee calculations so pricing gaps are shown net of all costs.

FAQ

Q1: Does Polymarket charge any other user fees besides the taker fee?
A1: No, Polymarket only charges taker fees for instant trades. There are no deposit, withdrawal, or maker fees, though you may pay network (blockchain) transaction fees.

Q2: Can you avoid taker fees by placing limit orders?
A2: Yes, if you post a limit order and someone else takes it, you pay 0% in fees. However, there’s no guarantee your order will fill, especially in low-liquidity markets.

Q3: How do I know which fee applies to a specific Polymarket market?
A3: The taker fee rate is shown in the market info on the Polymarket web/app interface. As of mid-2024, it’s 2% for all public markets.

ArbMonster is a data service. Nothing here is financial or betting advice; markets carry risk, venues have age and jurisdiction restrictions, and you are responsible for verifying everything before acting.