> ## Documentation Index
> Fetch the complete documentation index at: https://help.arcus.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# What time-in-force options are supported?

On each order you can set a time-in-force:

* **GTC** (good til canceled - rests on the book until canceled)

* **IOC** (immediate-or-cancel - fills whatever it can now, cancels the rest)

* **FOK** (fill-or-kill - fills in full immediately or cancels entirely)

* **Post-only** (limit order that will match only as maker, rejected if it would cross the book and take, so it is always eligible for the maker fee rate or rebate).