We need a trading system like what is used the game Warframe.
The way trading in Warframe works is both players go to a trading terminal, select the player they want to trade with. Then a UI opens up where both players select the items they are trading from their inventory. Both players can see the others trade before they hit confirm. Then both players have to hit Trade.
Trading in ASE and ASA is really risky. There is nothing stopping one of the players from grabbing both and running or dropping the wrong item on purpose.