Order types

limit + Gtc

Limit GTC — Standard limit order. Crosses if it can, the rest rests in the book.

limit + Gtc + postOnly

Post-Only — Only joins the book; rejected if it would cross immediately. Use for maker-only strategies.

limit + Ioc

Limit IOC — Fills the matchable portion immediately, cancels the rest.

limit + Fok

Limit FOK — All-or-nothing — fills the entire size at the limit or rejects.

market + Ioc/Fok

Market — limitPx is treated as a price-protection band. Never rests.

reduceOnly: true

Reduce-only — Order is rejected unless it strictly reduces the existing position. Direction reversal not allowed.