Free items collected from the city walls -- a daily-collect loop should grab these. Two types: (1) a fixed hourly item; (2) random items triggered when any server player buys a package. Hourly schedule (server time, as of 6/19/2024): 0:00 3h Construction; 1:00 3h Research; 2:00 3h Speed Up; 3:00 8h Construction; 4:00 3h Construction; 5:00 3h Research; 6:00 3h Speed Up; 7:00 8h Speed Up; 8:00 3h Construction; 9:00 12h Healing; 10:00 3h Speed Up; 11:00 8h Research; 12:00 3h Construction; 13:00 12h Speed Up; 14:00 3h Speed Up; 15:00 8h Speed Up; 16:00 3h Construction; 17:00 300 VIP Points; 18:00 3h Speed Up; 19:00 VIP 60 Minutes; 20:00 8h Construction; 21:00 3h Research; 22:00 3h Speed Up; 23:00 8h Construction. So the wall passively yields daily speedups plus a daily VIP-time item (19:00) and VIP points (17:00). Untimed random items (level 5 example): Free Tax x10, 30-min Speed Up x5, 10K resource boxes, VIP 60 minutes x5, etc. Higher wall levels give more/different items. For a bot, a wall-collect action a few times per day harvests free construction/research/general speedups and VIP time -- directly funding base_dev and daily loops.
Original research source: Evony Guide Wiki