yes
John Andre was one of the spies in the American revolution.
Spies were paid during the American Revolution. Spies were paid for information and most of the their information didn't come cheaply.
Spies helped by telling the side it was spying for what was happening on the other side.
Yes
YES
Some spies were women, who were not readily seen as being involved in the war.
so many people acted as spies for their side that soon spies were swarming everywhere.
They were spies and joined the army.
No
There were many spies during the American Civil War. Some of the better known male spies were Lafayette Baker, Timothy Webster, and Henry Harrison.
During the US Civil War, espionage was a factor in gaining information about both the North & South. The South had spies in Washington DC and the North had spies in Richmond, Virginia.
The closest is probably curiosus (literally "inquisitive one"). The Curiosi were a class of spies, informers and secret police in the time of the Roman Empire.