order_rejected

HTTP 400. The trading engine refused the order - amount below the exchange minimum, invalid price, or a similar venue rule.

What to do: Read detail; it carries the engine’s reason verbatim. Check the market’s min_order_amount/min_order_value on GET /v1/markets.

Every error is an RFC 9457 problem document - match on code (stable forever), show detail to humans, and quote instance when reporting an occurrence to support.