Polymarket Fee Formula: How Taker Fees, Transaction Costs, and Withdrawals Add Up
Polymarket is one of the largest decentralized prediction platforms, letting users trade on real-world events from politics to sports to crypto. But before anyone enters a trade, a practical question looms: how much do Polymarket fees actually cost? And what's the real, math-driven formula for calculating the total cost of trading, including taker fees, transaction fees, and withdrawals?
This article gives the definitive, worked-out answer. We'll break down every Polymarket fee, show exactly how to calculate them, and run through concrete examples using real-ish numbers. If you're looking for the precise "Polymarket fee formula"—for taker trades, for different market categories, and for on-chain transaction costs—this is the numerate, plain-English guide.
The Three Layers of Polymarket Fees
Users encounter three main types of fees on Polymarket:
- Taker Fees: Charged when placing market orders ("taking" liquidity from the order book).
- Transaction Fees: Blockchain costs (Polygon network gas fees) for depositing, trading, and withdrawing.
- Withdrawal Fees: Network and service charges for moving funds off-platform.
Let's break down each one, then combine them into a single, practical formula.
1. Polymarket Taker Fee: The Formula
Polymarket runs on an order book. If you place a market order (accepting another user's posted price), you pay a taker fee. (Limit orders that rest on the book and get filled pay no fee.)
Taker Fee Formula
The taker fee is a percentage of your gross trade value, and varies by market category:
- Politics/finance/tech/mentions: ~4% taker fee
- Sports/economy/culture/other: ~5% taker fee
- Crypto: ~7% taker fee
- Geopolitics: 0% taker fee
Formula:
Taker Fee = Shares × Category Rate × Price × (1 − Price)
Where:
- Shares = Number of shares traded
- Category Rate = ~0.04 for politics/finance/tech/mentions, ~0.05 for sports/economy/culture/other, ~0.07 for crypto, 0 for geopolitics
- Price = Fill price per share (in dollars)
Example 1: Politics Market
Suppose you buy 500 shares of "Will Candidate X win?" at $0.60 per share (politics category, ~4% rate).
- Shares = 500
- Category Rate = 0.04
- Price = $0.60
- Taker Fee = 500 × 0.04 × 0.60 × (1 − 0.60) = 500 × 0.04 × 0.60 × 0.40 = 500 × 0.04 × 0.24 = 500 × 0.0096 = $4.80
Example 2: Crypto Market
Suppose you buy 400 shares of "Will ETH > $4,000 on Dec 31?" at $0.50 per share (crypto category, ~7% rate).
- Shares = 400
- Category Rate = 0.07
- Price = $0.50
- Taker Fee = 400 × 0.07 × 0.50 × (1 − 0.50) = 400 × 0.07 × 0.50 × 0.50 = 400 × 0.07 × 0.25 = 400 × 0.0175 = $7.00
Note: If you post a limit order and someone else takes it, you pay $0 in taker fees.
2. Polymarket Transaction Fees: On-Chain Gas Costs
Because Polymarket is powered by the Polygon blockchain, all trades, deposits, and withdrawals involve a transaction fee ("gas fee").
How Large Are Gas Fees?
- Typical trade: $0.02–$0.10 per transaction (varies with network congestion)
- Deposits/withdrawals: $0.10–$0.30 each (sometimes more during peak congestion)
These are not controlled by Polymarket, but are paid to Polygon validators. They're denominated in MATIC (Polygon's token), but Polymarket abstracts this away for most users.
Example: Trading Gas Cost
If you place two trades in one session, and the network fee is $0.05 per transaction:
- Total transaction fees = 2 × $0.05 = $0.10
Example: Deposit Gas Cost
If you deposit USDC from your wallet to Polymarket, and the network fee is $0.20:
- Transaction fee = $0.20
Tip: Gas fees fluctuate. They can spike during high demand. Always check the quoted fee before confirming.
3. Polymarket Withdrawal Fees
When you withdraw funds from Polymarket, two fees may apply:
- Polygon network gas fee: As above, typically $0.10–$0.30 per withdrawal.
- Service/processing fee: As of mid-2024, Polymarket does not charge an extra withdrawal fee beyond network costs, but always check the latest Polymarket support docs for updates.
Example:
- Withdrawing $1,000 USDC, network fee: $0.20
- Total withdrawal fees: $0.20
The Complete Polymarket Fee Formula
To compute your total cost for a trade, sum:
- Taker fee (if taking liquidity):
Shares × Category Rate × Price × (1 − Price) - Transaction/gas fees: Deposit + Trading + Withdrawal gas costs
- Any service/processing fee: (currently $0, but check for updates)
Total Cost = Taker Fee + All Transaction/Gas Fees + Service/Processing Fee
Complete Example: End-to-End Polymarket Trade
Suppose you:
- Deposit $500 USDC from your wallet ($0.20 gas fee)
- Buy 600 shares of a sports market at $0.55/share (taker, ~5% fee, $0.05 gas fee)
- Later, sell those shares at $0.75/share (taker, ~5% fee, $0.05 gas fee)
- Withdraw $570 USDC to your wallet ($0.20 gas fee)
Step-by-step math:
1. Deposit
- Gas fee: $0.20
2. First Trade (Buy)
- Shares = 600
- Category Rate = 0.05
- Price = $0.55
- Taker Fee: 600 × 0.05 × 0.55 × (1 − 0.55) = 600 × 0.05 × 0.55 × 0.45 = 600 × 0.05 × 0.2475 = 600 × 0.012375 = $7.43
- Gas fee: $0.05
3. Second Trade (Sell)
- Shares = 600
- Category Rate = 0.05
- Price = $0.75
- Taker Fee: 600 × 0.05 × 0.75 × (1 − 0.75) = 600 × 0.05 × 0.75 × 0.25 = 600 × 0.05 × 0.1875 = 600 × 0.009375 = $5.63
- Gas fee: $0.05
4. Withdraw
- Gas fee: $0.20
Total Fees:
- Taker Fees: $7.43 + $5.63 = $13.06
- Gas Fees: $0.20 + $0.05 + $0.05 + $0.20 = $0.50
- Service Fee: $0
- Grand Total: $13.06 (taker) + $0.50 (gas) = $13.56
So, on $330 in and $450 out, you paid $13.56 in total fees—about 2.1% of total volume traded.
How Polymarket Fees Compare to Other Venues
- Kalshi: Charges a taker fee of 7% × contracts × price × (1 − price), rounded up to the cent, per fill, on most series. Makers pay $0 on most series. No deposit/withdrawal/settlement fees.
- Sportsbooks: Embed fees in the odds ("vig"), so the fee is hidden in the price rather than charged separately.
Key takeaway: Polymarket's fees are explicit and transparent, but add up over multiple trades, especially on higher-fee categories. Always factor all costs when comparing venues or seeking cross-market opportunities.
Automating Fee-Aware Opportunity Scanning
Manually comparing markets across venues—and accounting for every fee—is tedious and error-prone. This is why ArbMonster (https://arbmonster.com) scans Kalshi, Polymarket, and 20 major sportsbooks, live and net of all fees, to surface real arbitrage opportunities at fillable size. To learn more about the mechanics (and risks) of cross-venue trading, see our Learn page.
FAQ: Polymarket Fee Formula
Q1: Are taker fees charged on both buys and sells?
Yes. Any time you place a market order (buy or sell), the taker fee applies to the trade, regardless of direction.
Q2: Do gas fees apply if I only use the Polymarket web interface?
Yes. All transactions (deposits, trades, withdrawals) interact with the Polygon blockchain and incur gas fees, whether or not you see a crypto wallet.
Q3: Can I avoid taker fees by using limit orders?
Yes. If you post a limit order and someone else fills it, you pay zero taker fee. But you may wait longer, and your order may not fill at all.
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.