Polymarket adjusts trading mechanism, 15-minute crypto market opening and closing order fee

Prediction Market Platform Polymarket recently updated its official trading documentation, showing that its “15-minute cryptocurrency price movement market” has officially started charging trading fees to the taker side, indicating a change in Polymarket’s long-standing zero-fee mechanism. However, this applies only to specific short-term crypto markets, while most other markets still maintain a no-fee structure.

Polymarket quietly updates, charging first in the 15-minute crypto markets

According to the latest Polymarket documentation, the platform has officially begun charging trading fees on the “15-minute cryptocurrency up/down markets,” and only to the taker side. The document states that this system is not universally applied but limited to high-frequency, very short-cycle crypto markets. Most other markets continue to operate with no transaction fees.

Clear purpose for fees, all taker fees are redistributed to liquidity providers

The official explanation states that the trading fees collected from the taker side are not retained by the platform for revenue but are distributed daily in USDC to liquidity providers in the market, i.e., the order-placing side (Maker).

Polymarket emphasizes that the core purpose of this mechanism is to establish a stable liquidity subsidy source to support market pricing and depth, rather than to generate platform-level commissions or taxes.

Variable rates based on probability, highest costs in the 50-50 range

Regarding the fee structure, the official documentation indicates that trading fees will dynamically adjust based on market probability. When the market probability approaches 50%, the fee rate reaches its highest; as the probability moves toward 0% or 100%, the fee rate quickly decreases, approaching zero.

Using the example provided in the document, if a trader buys 100 contracts at $0.50 each, they would pay approximately $1.56 in trading fees, which is a little over 3% of the transaction value, representing the peak of the overall fee curve.

The diagram shows the official fee mechanism explained in the documentation. Community reactions focus on the structure, interpreting it as an adjustment to the market mechanism.

Although Polymarket has not issued an official announcement, this change quickly sparked discussion on community platforms. Some market participants pointed out that this adjustment seems more like a correction to the market structure rather than a simple fee increase.

Others believe that returning fees to the order-placing side via taker fees helps reduce wash trading and weakens the incentive for high-frequency trading bots to repeatedly place orders in a zero-fee environment.

Limited actual impact, short-term markets test first

In terms of scope, this adjustment applies only to the 15-minute crypto price movement markets and does not cover political predictions, long-term event contracts, or other non-crypto markets. Most users’ frequently traded markets still remain fee-free.

Additionally, even in markets where fees are charged, small transactions are rounded, so the actual fees are relatively limited; when trades are clearly one-sided bets with probabilities near extremes, the fee rate also drops significantly. Whether this mechanism will be expanded further has not been clarified by the official sources.

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This article about Polymarket adjusting its trading mechanism, with the 15-minute crypto market fee introduction, first appeared on Chain News ABMedia.