Why an order expires, and what happens to a late deposit

An order has a window. If no deposit arrives within it, the order expires.

Why there is a window

A quote reflects the market at a moment. Holding one open indefinitely means accepting whatever the market does in the meantime, on an order that may never arrive.

If your deposit arrives late

It is not simply lost. It becomes a deposit against an order that is no longer live, which needs handling:

• With a refund address on the order, it goes back automatically.
• Without one, it waits for a person to work out where it should go.

Avoiding it

Open the order when you are ready to send, not before. If fees on the sending chain are high enough that confirmation will be slow, account for that. And fill in the refund address, which turns the whole scenario from a problem into a return.