Order types - Numo Docs

Every order on Numo is a limit order. You sign a limit price and a size, and the order rests on the book until it fills, expires or is cancelled. There are no market, IOC or FOK orders. To trade at once, price your limit through the opposite side of the book.

Flags

Field	Markets	Effect
`post_only`	Spot and futures	The order may only add liquidity.
`reduce_only`	Futures only	The order may only shrink your position in that series.

Post-only

A post_only order is refused on submission if it would cross the book. Once resting, it is never the taker on a fill. Use it to make sure you are always the maker. See Fees.

Reduce-only

A reduce_only order can only reduce your position in its series.

It is refused with 422 if you have no position, or if it is on the same side as your position.
Each fill is clamped so it never takes your position through zero.
Once your position is flat, the order is cancelled with cancel_reason: "reduce_only_done" or "reduce_only_no_position".
It is refused with 400 on spot.

Expiry

expiry is a unix timestamp that you sign into the order. It must be in the future on submission. Once it passes, the order’s status becomes expired and it no longer fills.

Futures limits

A futures order’s limit price must be inside the fill band when you submit it. See Orders the venue refuses for every refusal. See Create order for the full request body.