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Price slippage occurs when the price you expect to sell at is different from the price your order actually receives. This usually happens when liquidity is low or when an outcome appears nearly decided.

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Why It Happens

  1. Markets stay open until settlement
    Event contracts on Polymarket US remain open until the final outcome is confirmed, even if the result looks certain.
  2. Liquidity thins on the side that is already priced as the likely winner
    As a result becomes clear, demand often drops on the side priced as the likely winner. If you try to exit a winning position early, there may not be enough buyers at the expected price.
  3. Prices can move while you sell
    With limited liquidity, your sell order may fill at lower levels than the displayed price.
For example, if a contract is trading near 97¢ close to resolution, limited demand could cause your order to fill at 94¢ instead of the expected 97¢.

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Best Practices

  • Consider holding until settlement
    When liquidity is thin, holding through resolution may provide better value, since winning contracts settle at full price.
  • Always check before selling
    Compare your position value and the current trading price to understand what you may receive if you exit early.
If you would like to review a recent trade, contact Polymarket US Support — we can walk you through it.