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Orderly supports 5 order types:

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Market

Executes immediately at the best available prices until the full size is filled. If the order is larger than the entire book, or the matching price exceeds the price limit, the remaining quantity is canceled.

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IOC (Immediate or Cancel)

Fills as much as possible at the specified price, immediately. Any unfilled portion is canceled — it will not remain in the order book.

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FOK (Fill or Kill)

All-or-nothing. If the entire order can be filled at the specified price, it executes in full. Otherwise the entire order is canceled with no partial fill.

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Post Only

Guarantees you are the maker. If the order would match immediately upon placement (making you a taker), it is canceled instead. Use this to ensure you only pay maker fees.

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Reduce Only

Can only decrease an existing position. It will not open a new position or increase your current one. Useful for closing out a position without risk of accidentally flipping direction.