Reading the numbers

You see	It means
A venue price	A reference for the same contract on that venue, after its fees. Trading is on Moneyness.
Our price	All-in. Nothing is added at the button.
Not offered	We have no offer for that contract right now.
Fee unknown	We could not confirm that venue’s fee, so no all-in price is shown for it and it is never ranked as cheapest.
Last updated	When Moneyness last observed the numbers on screen (our observation time, not the venue’s clock).
Sent / Checking if this filled / Not filled	The stages of a trade you placed.
Failed. Nothing was traded.	The trade did not go through and nothing changed.

An empty value means we do not know it. We never show an unknown as zero.