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You place every trade through the order slip. It looks the same on Kalshi and Polymarket, on web and desktop, in demo and live — learn it once, use it everywhere. It’s built into the Event Viewer, opens as its own panel with / → ORD, and pre-fills when you click a price in the order book or Sell on a position. Order slip showing market, account, side, contract, order type, slippage, and amount

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Anatomy of the slip

Top to bottom:

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Market & account

The Market row shows exactly what you’re trading (with a Switch control to change markets within the event). Below it, the Account row shows which account and venue the order routes through — with a Live badge so you always know whether this is real money or demo. Switch accounts here or in Balances.

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Side and contract

  • Buy opens or adds to a position; Sell reduces or closes one.
  • Yes / No picks the outcome, each showing its live price in cents.

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Order type

For limit orders you set the price in cents (1–99) — or click a level in the order book to start from there. Kalshi trades are market-only in on-chain trading.

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Max slippage (market orders)

Thin books mean a market order can fill beyond the quoted price. The slippage row caps how far you’re willing to go: Auto, a fixed 1¢ / 2¢ / 5¢ buffer, or a custom value. The “Est. fill ≤” readout shows your worst-case price before you commit.

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Amount

Enter your size in dollars or flip the toggle to contracts (the $ / # buttons). Quick-add buttons (+1,+1, +20, +$100) build size fast, and Max sizes against your available balance.
Polymarket enforces a $1 minimum order size.

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Review and submit

The slip shows your estimated cost, fees, and potential payout. Hit Review, confirm, and the order goes out — fills come back in seconds with a toast (and a satisfying sound). Your position appears immediately in the Portfolio. For limit orders that don’t fill immediately, the order rests in the book — track and cancel it from Portfolio’s Resting tab.

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Gates you might hit

Browsing is open to everyone; trading needs an account. The slip prompts you to sign in if you’re not.
A one-time identity check unlocks Kalshi buying. Polymarket has no such requirement.
Orders draw from the active account’s balance on that venue. Add funds, or practice in demo mode first.
Occasionally a venue’s trading is paused for maintenance — the slip tells you, and the other venue keeps working normally.

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What’s next

Managing & closing positions

Take profit, cut losses, cancel resting orders, redeem winnings.

Reading a market

Judge spread and depth before you size up.