The order form has three tabs — Market, Limit and Atomics — plus flags that change how your order is filled. Which options appear depends on the market you are trading.
Market orders
A market order fills immediately at the best available price. The trade summary shows an estimated fill price and estimated slippage before you submit, but the final price can differ. Market orders pay the taker fee.
Limit orders
A limit order sets the price you are willing to trade at. If it cannot fill at that price it waits — or is cancelled, depending on the time in force below.
The app rejects a limit price that is more than 20% away from the current market price: "Limit price must be within 20% of the current market price."
Time in force (TIF)
On order-book markets the TIF selector controls what happens if your order cannot fill fully and immediately:
| Option | Behavior |
|---|---|
| GTC — Good 'Til Cancelled | Rests on the book until it fills or you cancel it. |
| IoC — Immediate or Cancel | Fills whatever it can right away; the rest is cancelled. |
| FoK — Fill or Kill | Fills completely right away, or is cancelled entirely. If it cannot, you see "The order could not fill completely and was cancelled." |
Some markets accept only IoC and FoK. On a market in post-only mode the selector is hidden, because only resting orders are accepted.
Post Only
Post Only (order-book limit orders) guarantees your order only ever adds liquidity, so you pay the maker fee. If your price would trade immediately, the order is rejected rather than filled: "Post-only: this price would take liquidity immediately. Place it on the maker side of the book, or turn off post-only."
Post Only cannot be combined with IoC or FoK, and it is forced on for markets in post-only mode.
Fill or Kill (RFQ markets)
On RFQ markets, limit orders offer Fill or Kill instead of the TIF selector and Post Only — RFQ fills against a quote rather than a resting book. See RFQ vs order book for the differences.
Reduce Only
Reduce Only guarantees an order can only shrink an existing position, never open or flip one. It requires a position on the opposite side:
- "Reduce-only orders require an existing position to close."
- "Reduce-only size cannot exceed your open position (in base)."
It is the safest way to scale out of a position.
Take Profit / Stop Loss
You can attach Take Profit and Stop Loss levels to close a position automatically when a price is reached, and edit them later from the positions table. Some markets do not support them yet and show "TP/SL is not available yet on this market. Coming soon."
Atomics
Atomics is a separate order type with its own article — see the Atomics category. It is not available on RFQ markets or while a market is in post-only mode.
Common rejections
- "Amount must be greater than 0"
- "Minimum order is …" — each market has a minimum size
- "Limit price must be > 0"
- "Not enough available margin." — see Understanding margin, account health and liquidation