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Buy now, think later (but please think first)

A market order fills immediately at the best available price on Polymarket’s orderbook. No waiting, no price-setting — you see a number, you take it. This is how most trades happen on Supermission.
1

Find a market

Browse the market grid or search for a topic. Click any market card to open the detail view.
2

Pick your side

Hit YES or NO. The button highlights and the order panel appears on the right.
3

Enter your amount

Type how much USDC you want to spend. The panel instantly shows how many shares you’ll receive and the effective price per share.
4

Confirm the trade

Click Confirm Trade. The order hits Polymarket’s CLOB as a FAK (Fill-And-Kill) order — it fills what it can immediately and cancels any remainder.

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What is FAK execution?

FAK stands for Fill-And-Kill. Your order grabs all available liquidity at the current price, fills as many shares as possible, and kills the rest. No partial orders sitting on the book.
If liquidity is thin, you might not get your full size filled. The confirmation screen shows expected fill before you commit.

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When to use market orders

  • You have conviction and want in now
  • The market is liquid (tight spread, deep book)
  • You’re trading a fast-moving event where seconds matter
On thin markets, market orders can slip. If the spread is wide (YES at 52c, NO at 55c), consider a limit order instead. You’ll get a better price and the patience usually pays.

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The shortcut: Oracle agent

Don’t want to click through screens? Tell Oracle:
“Buy $25 on YES for the Fed rate cut market”
Same FAK execution, zero clicking. Oracle confirms the details before executing.
Market orders are your bread and butter. But the best traders use them for entries and limit orders for exits. Something to think about.