Polymarket Fees: The Complete Breakdown
One of Polymarket's biggest selling points is its zero-fee trading model. But what does that actually mean in practice? Are there hidden costs? This guide breaks down every fee and cost associated with using Polymarket.
Trading Fees: Zero
Polymarket charges no trading fees, commissions, or spreads on any trade. When you buy or sell shares, the platform does not take a cut. This applies to:
- Market orders
- Limit orders
- Buying YES or NO shares
- Selling shares before resolution
This is a significant advantage over competitors. Kalshi, for example, charges per-contract fees on every trade. For active traders, Polymarket's zero-fee structure saves hundreds or thousands of dollars annually.
The Real Costs
While trading is free, there are costs to be aware of.
Bid-Ask Spread
Every market has a gap between the highest buy price (bid) and the lowest sell price (ask). This spread is not a fee charged by Polymarket — it is a natural feature of any order-book-based market, including stock exchanges.
Example: A market shows YES at $0.64 bid / $0.66 ask. If you buy at $0.66 and immediately sell at $0.64, you lose $0.02 per share. This spread is the cost of instant execution.
Liquid markets (high volume, many participants) have tight spreads — often just $0.01. Illiquid markets may have wider spreads of $0.05 or more.
Polygon Gas Fees
Polymarket runs on the Polygon blockchain. Every transaction (trade, deposit, withdrawal) requires a small gas fee paid to Polygon network validators.
How much: Typically less than $0.01 per transaction. Polygon is designed for low-cost transactions, and gas fees are negligible for almost all users.
Card Deposit Fees
If you deposit using a debit card, the third-party payment provider charges a processing fee.
How much: Typically 1-3% of the deposit amount.
How to avoid: Deposit USDC directly via the Polygon network. If you already have USDC on a crypto exchange, sending it to Polymarket costs only the Polygon gas fee (~$0.01).
For deposit methods, see our deposit guide.
Exchange Conversion Fees (Withdrawal)
When you withdraw USDC and convert it to your local currency on a crypto exchange, the exchange charges conversion fees.
How much: Varies by exchange, typically 0.1-1% of the conversion amount.
This is not a Polymarket fee — it is charged by whatever exchange you use to convert USDC to fiat. See our withdrawal guide for details.
Fee Comparison: Polymarket vs Others
| Fee Type | Polymarket | Kalshi | Traditional Sportsbook | |---|---|---|---| | Trading fee | $0 | $0.01-$0.07 per contract | Built into odds (4-10% vig) | | Deposit fee | 0-3% (card) / ~$0 (crypto) | $0 (bank) / varies (card) | $0 | | Withdrawal fee | ~$0 | $0 | $0 | | Spread cost | Market-dependent | Market-dependent | Built into odds |
Impact on Profitability
The zero-fee structure means:
Smaller edges are profitable. On a fee-charging platform, you need your edge to exceed the fee before you make money. On Polymarket, any positive expected value trade is immediately profitable.
Active trading is viable. Traders who make many small trades per day are not eroded by accumulated fees. This enables strategies like news trading and momentum trading that would be costly on fee-charging platforms.
Position sizing is simpler. You do not need to factor trading costs into your Kelly Criterion calculations. Your expected value is your actual expected value.
For strategies to maximize your profitability, see our guide on how to make money on prediction markets.
Tips to Minimize Costs
- Trade liquid markets. Tighter spreads mean lower effective costs. Check volume before trading
- Use limit orders. Instead of buying at the ask price, place a limit order between the bid and ask. You may get a better price
- Deposit via crypto. Avoid card processing fees by depositing USDC directly on Polygon
- Batch withdrawals. Withdraw less frequently to minimize exchange conversion fees
- Compare exchanges. Different exchanges charge different conversion fees. Shop around for the best rate when cashing out
The Bottom Line
Polymarket is genuinely one of the cheapest prediction market platforms to trade on. Zero trading fees, negligible gas costs, and no hidden charges make it particularly attractive for active traders. The only meaningful costs are card deposit fees (avoidable) and exchange conversion fees (when cashing out).
For more on Polymarket, see our complete review or get started with our beginner's guide.
