Glossary
Post-only order
Also called ALO
An order flag, shown as ALO, that rejects the order if it would execute immediately. It guarantees you pay the maker fee rather than the taker fee.
Checked against the Hyperliquid documentation 8 Sept 2026 · how we check
Related terms
- Maker fee The fee charged when your order rests on the book and is filled by someone else. On Hyperliquid it is roughly a third of the taker fee at the entry tier and reaches zero at higher tiers.
- Limit order An order to trade at a specified price or better. It rests on the book until filled or cancelled, which is what earns the maker fee.